Enhanced wireless synchronous release device for multi-model wind tunnel test

Abstract

The invention relates to an enhanced wireless synchronous release device for a multi-model wind tunnel test. The enhanced wireless synchronous release device is composed of a wireless remote control unit, a fusing control unit, a fusing electrode loop and a remote monitoring unit. The wireless remote control unit carries out low-delay remote control instruction transmission and high-reliability data interaction through high-frequency short-coding infrared communication and low-power-consumption radio frequency wireless communication. The fusing control unit receives an infrared instruction through narrow-spectrum filtering, narrow-band amplification filtering, hardware demodulation and software coding detection, and realizes programmable delay and discharge control of a discharge window based on boost charging, high-voltage capacitor energy storage and digital variable pulse width chopping control; the fusing electrode loop is connected in series with the buffer inductor to improve energy utilization efficiency; an abnormal reset detection and state continuing working mode is adopted to enhance the working reliability; the remote monitoring unit is connected with the wireless remote control unit in a wired mode to achieve remote monitoring. According to the invention, the anti-interference capability and reliability of low-delay wireless remote control in scenes of wind tunnel model release and the like can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing technology, and in particular to a wireless remote-controlled synchronous release device for single or multiple models in wind tunnel model free-flight tests or external model release tests, in order to solve the problems of insufficient anti-interference capability, high latency, poor reliability, and low ease of use of existing synchronous release technology. Background Technology

[0002] In wind tunnel tests such as free flight and external model release, the model needs to be released suddenly, and the model's falling attitude must maintain a minimal deviation from its initial attitude within the effective wind tunnel test time after release. This places extremely high demands on model release control technology, requiring not only minimal control delay and release attitude change, but also high system reliability, good repeatability, and minimal disturbance to the flow field around the model after release. Existing publicly available technologies mainly include electromagnetic release technology, mechanical cutting release technology, and thermal fuse release technology. Invention patent CN112284674A (He Chao, An Electromagnetic Suspension and Release Device for Hypersonic Wind Tunnel Model Free Flight Test, 2021-01-29) discloses an electromagnetic release technology, which uses an electromagnet to attract the model and then suddenly releases it by cutting off the power. However, this technology suffers from problems such as large delay due to magnetic hysteresis and poor release synchronization, and requires the model surface to have a magnetically conductive material for attraction. Invention patent CN118980488A (Fang Zhen, Control Method for Low-Disturbance High-Response Speed ​​Release Device and Wind Tunnel Test System, 2024-10-10) discloses a mechanical cutting release technology that uses ropes to suspend the model. The model is released by suddenly cutting the suspension ropes with a controlled blade. This technology suffers from problems such as large mechanical action delay, poor synchronization, and a large actuator that is difficult to install inside the model. Furthermore, residual ropes remain on the released model, easily disturbing the flow field. Invention patent CN114813028A (Liu Hongshan, A Mechanical Release Device in Wind Tunnel Free-Drop Test, 2022-07-29) discloses a thermally fused release technology. This technology uses a mechanical structure to constrain the model, a spring to store energy, and a constantan wire to lock the mechanical structure. Then, a sudden energization melts the constantan wire, unlocking the mechanical structure and releasing the model using spring force. This technology also suffers from large mechanical action delay and large synchronization errors in the release of multiple models, making it difficult to adjust. The invention patent CN117782502A (Liu Shiran, A Shock Tunnel Model Suspension Test Device and Method, 2024-03-29) discloses a release technology for a model suspension wire that is fused by a fuse. It consists of an external remote controller, a receiver installed inside the model, a capacitor charging device, and a resistance wire that is closely attached to the suspension wire. After receiving a remote control trigger signal sent by the remote controller, the receiver inside the model sends a control command to control the fully charged capacitor to discharge instantaneously to multiple resistance wires connected in series inside the model that are closely attached to the suspension wire. This causes the resistance wire to heat up rapidly and fuse the suspension wire, thus releasing the model. When the suspension wire is a thermally sensitive wire such as Dyneema wire and the model itself is under its own weight, the suspension wire can be quickly fused from inside the model. Ideally, the model can be released and fall with almost no impact on its attitude in scenarios such as shock tunnel tests, and the flow field around the model is not affected by interference factors such as the suspension wire.However, the invention patent CN117782502A (Liu Shiran, A shock tunnel model suspension test device and method, 2024-03-29) does not disclose the specific technology of fuse release control. In particular, it does not provide clear technical solutions for the millisecond-level delay requirements of shock tunnel tests, the complex electromagnetic and thermal infrared interference problems when multiple devices are working inside the model in a vacuum environment, and the problem of short life due to easy vaporization of the resistance wire under high current discharge conditions. As a result, its application faces problems such as large delay, false triggering, short life of resistance wire, and low efficiency due to uncontrollable discharge power.

[0003] Therefore, this invention is mainly aimed at wind tunnel test scenarios such as free flight of models or release of externally attached models. It provides a low-latency, high-reliability wireless control synchronous release device that can be used for single-model multi-point suspension or multi-model multi-point suspension, and supports remote parameter and status interactive monitoring, thereby achieving low-latency, reliable synchronous fuse release of models in wind tunnel tests. Summary of the Invention

[0004] This invention aims to solve the problems of low latency, anti-interference, and high reliability of wireless synchronous release control of models under different wind tunnel test conditions, such as single-model multi-point suspension or multi-model multi-point suspension. It provides an enhanced single / multi-model wireless synchronous release device based on dual-mode communication and variable pulse width chopper discharge control, which has remote parameter setting and status monitoring, thereby meeting the test scenario requirements of free flight of models or release of externally attached models in different wind tunnel tests.

[0005] The technical solution of this invention is as follows: a synchronous release scheme based on the instantaneous high-current heating of the resistance wire to fuse the suspension wire of the model. It adopts a split design, consisting of four parts: a wireless remote control unit 1, a fuse control unit 2, a fuse electrode circuit 3, and an optional remote monitoring unit 4. The wireless remote control unit 1 is placed outside the model and is used for local interactive setting of working parameters and monitoring of working status. Simultaneously, it receives externally input model release control signals and remotely controls the fuse control units 2 installed inside each model to discharge to the fuse electrode circuit 3, achieving synchronous heating and fusing of the model suspension wire to complete the synchronous release of the model. Alternatively, it can receive working parameter settings and feedback of working status from the remote monitoring unit 4 via wired communication, thereby achieving convenient remote monitoring of multi-model wireless synchronous fuse release. The wireless remote control unit 1 and the fuse control unit 2 adopt a dual-mode communication method combining low-latency infrared coded communication and low-power radio frequency communication. The wireless remote control unit 1 transmits the model release command by transmitting high-frequency short-coded infrared signals. The fuse control units 2 inside each model utilize the narrow-spectrum infrared filtering, transimpedance amplification, and hardware of the infrared receiving probe. Demodulation and software digital encoding detection enable ultra-low latency reliable reception of high-frequency short-coded infrared commands, thereby achieving low-latency remote control of fuse release against complex electromagnetic and thermal infrared interference. The wireless remote control unit 1 achieves reliable parameter setting and status interaction for each fuse control unit 2 through low-power radio frequency communication. The fuse control unit 2 uses boost charging and high-voltage capacitor energy storage to buffer energy, and uses digital variable pulse width chopper control to control the capacitor to discharge high-power short-time power through a programmable window to the fuse electrode circuit 3, which has one or more fuse electrodes and a buffer inductor in series. This allows the resistance wires of each fuse electrode to heat up synchronously and rapidly and fuse the model suspension wire, thereby improving the utilization efficiency of capacitor energy storage under the condition of fewer fuse electrodes and ensuring an effective fusing time. This reduces the vaporization caused by thermal stress of the resistance wire, thus extending its life and improving the reliability of the test. The fuse electrode adopts a separate combination structure of metal frame and insulator, with embedded resistance wire and its support. It also serves as a connector between the suspension wire and the model and as a suspension fuse. The resistance wire is connected in series in the fuse electrode circuit and makes reliable contact with the model suspension wire. Both the wireless remote control unit 1 and the fuse control unit 2 use a low-power main control chip as the control core and are powered by batteries. They each support independent programmable delays to meet the needs of custom delay fuse triggering and release under different wind tunnel test conditions. The fuse control unit 2 also has multiple independently programmable delay synchronous trigger signal outputs for custom delay operation triggering of other devices inside the model in different wind tunnel tests.

[0006] Accordingly, the device of the present invention consists of a wireless remote control unit 1, a fuse control unit 2, a fuse electrode circuit 3, and a remote monitoring unit 4.

[0007] The wireless remote control unit 1 uses a low-power main control chip as its control core and is battery powered. It serves as the local interactive terminal and communication control relay for the device of this invention. It receives external model release control signals (TRIGs) via a wired connection. It sends low-latency commands to the fuse control unit 2 and performs bidirectional data interaction using a dual-mode communication method combining low-latency infrared coded communication and low-power radio frequency communication. It also interacts with the remote monitoring unit 4 via a wired communication method, thereby realizing local working parameter configuration, wireless forwarding of model release control signals (TRIGs), and relay functions for remote monitoring. Accordingly, the wireless remote control unit 1 consists of a remote control main control module 1a, a release control signal input module 1b, an infrared command transmission module 1c, a wireless radio frequency communication module 1d, a wired communication module 1e, a human-machine interaction module 1f, and a power management module 1g. The functionality of each module depends on the hardware circuitry and the software strategy within the main control chip.

[0008] The remote control main control module 1a consists of a low-power main control chip and the necessary crystal oscillator circuit, reset circuit, and program download / debugging circuit. It coordinates and schedules the collaborative work of each module in the wireless remote control unit 1 through software, thereby realizing the functions of the wireless remote control unit 1. During each startup initialization phase, the software of the remote control main control module 1a performs a reset mode detection to distinguish between normal and abnormal resets. In the case of a normal reset, after initializing the state of the wireless remote control unit 1 itself, the software in the remote control main control module 1a sends an initialization command to each of the fuse control units 2 via the wireless radio frequency communication module 1d to allow each fuse control unit 2 to perform state initialization. In the case of an abnormal reset, the software in the remote control main control module 1a reads the working process state of the wireless remote control unit 1 from the non-volatile memory before the abnormal reset and continues execution of this process state. This avoids interruption or logical chaos of the entire device's working process due to a unilateral unexpected restart of the wireless remote control unit 1 in practical applications, improving the robustness of the device's operation and minimizing the risk of failure in high-cost wind tunnel tests.

[0009] The release control signal input module 1b consists of a hardware-level pulse interference suppression circuit, a level conversion circuit, and a software-programmable pulse detection synchronization window. Through the combination of hardware and software, it effectively avoids narrow pulse interference on the model release control signal input port and correctly identifies valid model release control signals TRIG that exceed the specified duration, thereby improving the reliability of the device and avoiding invalid triggering in wind tunnel tests. The pulse interference suppression circuit uses an RC low-pass filter composed of resistors and capacitors or a pulse group suppression circuit containing transient voltage suppression diodes (TVS), varistors (MOV), or ferrite beads to effectively filter out high-frequency noise and pulse group interference. The level conversion circuit uses a resistor voltage divider circuit to convert high-voltage logic levels to low-voltage logic levels, or uses a level conversion chip to convert different logic levels, so as to perform logic level conversion when the logic level of the model release control signal TRIG does not match the logic level of the main control chip in the remote control main control module 1a. The software programmable pulse detection synchronization window is directly implemented by the timing module in the remote control main control module 1a. That is, only when the effective trigger level of the TRIG signal lasts longer than the synchronization window duration is it determined to be a valid model release control signal, so as to further enhance the suppression capability of narrow pulse interference.

[0010] The infrared command transmission module 1c consists of a hardware circuit module comprising a communication encoding modulation circuit, a logic AND gate circuit, a switch driving circuit, and a high-power infrared transmission circuit, along with a software control strategy for high-frequency, narrow-pulse, short-code infrared transmission. The high-power infrared transmission circuit comprises a small-value resistor, a high-power infrared LED (IR), and a high-frequency switch. The main control chip in the remote control main control module 1a outputs a high-frequency narrow-pulse switch signal via software control, and also drives the communication encoding modulation circuit to output a short-code signal. After a logical AND operation between the high-frequency narrow-pulse switch signal and the short-code signal, the switch driving circuit drives the high-frequency switch in the high-power infrared transmission circuit to perform a switching action, thereby controlling the infrared LED in the high-power infrared transmission circuit to transmit a high-power high-frequency infrared remote control command with short-code information. The infrared remote control command includes, but is not limited to, infrared remote control handshake commands and infrared remote control release commands, used for monitoring the low-latency infrared coded communication connection status and synchronously controlling the fuse control unit 2 in each model to control the transmission of the fuse. Electrode circuit 3 discharges; accordingly, the infrared command transmission module 1c uses infrared communication to suppress complex environmental electromagnetic interference, uses a software control strategy of high frequency and short code modulation to enhance the anti-interference capability against ambient light and complex thermal infrared interference and achieve effective low-latency infrared remote control, uses a software control strategy of narrow pulse drive and a high-power infrared transmission circuit to enhance the infrared remote control distance and range, and uses the information carrying capacity of short code to transmit different low-latency infrared remote control commands, and uses software programmable delay to realize the delayed transmission of infrared remote control commands with custom delay time, thereby ensuring the synchronous transmission of infrared remote control commands with long time, high reliability, low latency and custom delay time.

[0011] The wireless radio frequency communication module 1d adopts a low-power radio frequency wireless communication scheme that supports broadcast transmission and point-to-point transmission. It is used for bidirectional data interaction and heartbeat packet transmission between the wireless remote control unit 1 and the fuse control units 2 in each model, so as to realize the wireless setting of the working parameters and monitoring of the working status of each fuse control unit 2. The software of the wireless radio frequency communication module 1d adopts a dynamic connection management mode to maintain the list of fuse control units 2 wirelessly connected to the wireless remote control unit 1, so that it can automatically adapt to the wireless communication connection requirements of different numbers of fuse control units 2 in different application scenarios and automatically restore the connection after the node connection anomaly of the fuse control unit 2 is eliminated, thereby improving the robustness of the system.

[0012] The wired communication module 1e preferably uses a differential wired communication scheme to receive parameter setting instructions, remote operation instructions, and data request instructions from the remote monitoring unit 4, and performs corresponding settings, operations, and status feedback, thereby realizing remote monitoring and improving the convenience of the application.

[0013] The human-machine interaction module 1f integrates buttons and display components, and is used to browse, set and monitor the working parameters and working status of the wireless remote control unit 1 and each of the fuse control units 2 locally.

[0014] The power management module 1g consists of a voltage conversion circuit and a battery management circuit. It is responsible for converting the battery voltage into the voltage required for the operation of each module of the wireless remote control unit 1, and realizing battery power monitoring and charging protection control.

[0015] The fuse control unit 2 uses a low-power main control chip as the control core and is powered by a battery. It consists of a low-voltage control section and a high-voltage energy storage and discharge section, and is installed inside each model to be released. It uses narrow-spectrum infrared filtering, transimpedance amplification, hardware demodulation and software digital encoding detection technology to achieve low latency, anti-interference and high reliability reception. Low-power radio frequency communication technology is used to interact with the wireless remote control unit 1 to complete the setting of working parameters and status feedback. Single-stage or multi-stage boost charging technology is used to control rapid high-voltage charging energy storage. When receiving the infrared remote control release command transmitted by the wireless remote control unit 1, digital variable pulse width chopper control technology is used to control the high-current discharge to the fuse electrode circuit 3 with programmable delay and programmable discharge time window to realize the fuse release model. At the same time, it supports single or multiple synchronous trigger signal outputs with independent programmable delays for triggering the operation of other devices in the model to be released. Accordingly, the fuse control unit 2 consists of a fuse main control module 2a, a wireless radio frequency communication module 2b, an infrared command receiving module 2c, a high-voltage energy storage discharge module 2d, a synchronous trigger signal output module 2e, a human-machine interaction module 2f, and a power management module 2g. The function implementation of each module depends on the hardware circuit and the software strategy in the main control chip.

[0016] The fuse control module 2a consists of a low-power main control chip and the necessary crystal oscillator circuit, reset circuit, and program download / debugging circuit. It achieves the function of the fuse control unit 2 by uniformly scheduling and coordinating the collaborative work of each module in the fuse control unit 2 through software. During each startup initialization phase, the software of the fuse control module 2a performs a reset mode detection to distinguish between normal and abnormal resets. In the case of a normal reset, the software in the fuse control module 2a initializes the state of the fuse control unit 2 itself. In the case of an abnormal reset, the software in the fuse control module 2a reads the working process state of the fuse control unit 2 before the abnormal reset from non-volatile memory and continues execution of this process state. This avoids interruption or logical chaos of the entire device's working process due to a unilateral unexpected restart of the fuse control unit 2 in practical applications, improving the robustness of the device's operation and minimizing the risk of failure in high-cost wind tunnel tests.

[0017] The wireless radio frequency communication module 2b adopts the same low-power radio frequency wireless communication scheme as the wireless radio frequency communication module 1d in the wireless remote control unit 1, and is used for bidirectional interactive communication between the fuse control unit 2 and the wireless remote control unit 1, so as to realize the wireless setting of the working parameters and monitoring of the working status of the fuse control unit 2 by the wireless remote control unit 1.

[0018] The infrared command receiving module 2c consists of a hardware component comprising a narrow-spectrum infrared filter, an infrared receiving tube, a transimpedance amplifier circuit, a narrowband filter circuit, and a hardware demodulation circuit, as well as software digital encoding detection technology. The infrared light signal of the short-coded infrared remote control command sent by the wireless remote control unit 1 is first filtered by the narrow-spectrum infrared filter and then received by the infrared receiving tube to enhance the anti-interference capability against complex infrared signals in the environment from the optical path. The output signal of the infrared receiving tube is amplified by the transimpedance amplifier circuit and then filtered by the narrowband filter circuit to further suppress infrared interference in the same spectrum in the environment and amplify the effective infrared remote control signal. Then, it is demodulated into a short-coded digital signal by the low-latency hardware demodulation circuit and sent to the digital input port of the main control chip in the fuse main control module 2a. The encoded value of the short-coded infrared remote control command is obtained by the software digital encoding detection in the main control chip, and then corresponding interactive or control operations are performed according to the encoded value of the infrared remote control command. The short-coded remote control ensures low latency; the execution of corresponding control operations according to the encoding further improves the anti-interference capability of the device of the present invention.

[0019] The high-voltage energy storage discharge module 2d consists of a hardware component comprising a boost circuit, a single / multi-stage charging circuit, a high-voltage energy storage capacitor, a charging voltage detection circuit, and a discharge control circuit, and a software control strategy for digital variable pulse width chopper discharge control. The boost circuit is used to raise the low voltage supplied by the battery to the high voltage required for high-power discharge of the fuse electrode circuit 3. The single / multi-stage charging circuit consists of one or more solid-state switching circuits, used to charge the high-voltage energy storage capacitor using the high-voltage power supply output from the boost circuit. The choice between a single-stage or multi-stage charging circuit, and the specific charging stage, is determined comprehensively based on the target charging voltage, charging speed, and the overall size requirements of the fuse control unit 3. The high-voltage energy storage capacitor uses a large-capacity, high-voltage capacitor to maximize stored energy and discharge time constant. The charging voltage detection circuit detects the voltage across the high-voltage energy storage capacitor in real time, quantizes it digitally, and feeds it back to the fuse control module 2a for software charging control, while simultaneously transmitting the data back to the wireless remote control unit 1. The discharge control circuit consists of a high-power switching transistor and its isolation drive circuit, a discharge interface circuit, and a bypass discharge circuit. The high-power switching transistor is connected in series in the main discharge circuit between the output of the high-voltage energy storage capacitor and the discharge interface. A high-power freewheeling diode is connected in reverse parallel on the discharge interface. The fuse control signal output by the fuse main control module 2a drives the MOS transistor to switch on and off through the isolation drive circuit to achieve high-power discharge of the fuse electrode circuit 3. The bypass discharge circuit consists of a manual button, a solid-state switch, and a discharge current-limiting resistor. Bypass discharge can be performed manually or by software control so that during the testing and maintenance of the device of this invention, the electrical energy on the high-voltage energy storage capacitor can be manually discharged through the bypass to reduce the voltage across the high-voltage energy storage capacitor to a safe voltage range. In terms of software control, the target voltage for single-level or multi-level charging can be set by software programming. The fuse control signal for the on / off switching of the high-power switching transistor in the drive discharge control circuit is generated by digital variable pulse width chopper control. The preferred pulse width scheme is the first pulse width and subsequent pulse widths to accelerate the heating of the resistance wire in the fuse electrode and limit the maximum thermal stress. In addition, it supports custom delay and custom discharge window duration, so as to perform custom delay variable pulse width chopper discharge control on the fuse electrode circuit 3 according to the needs of different wind tunnel test scenarios. While ensuring the effective discharge window width and discharge energy, it reduces the vaporization phenomenon of the resistance wire in the fuse electrode circuit 3 due to high thermal stress in the initial high-voltage discharge stage of the high-voltage energy storage capacitor, thereby improving the working life of the resistance wire in the fuse electrode circuit 3 and further improving the working reliability of the device of the present invention.

[0020] The synchronous trigger signal output module 2e consists of a drive buffer circuit and an independent programmable delay and programmable polarity configuration software control strategy. It is used to independently delay and output single or multiple synchronous trigger signals to other working devices after receiving trigger control commands from other devices transmitted via radio frequency wireless communication or infrared remote control release commands. The drive buffer circuit is used to convert the trigger signal output by the fuse control unit 2's fuse main control module 2a into a digital control trigger signal required for external device operation. This includes necessary isolation circuits, level conversion circuits, drive buffer circuits, or combinations thereof for different scenarios. When an isolated synchronous trigger output signal is required in the application, the synchronous trigger signal output module 2e must include an isolation circuit. When the logic level of the input trigger signal required by the target control device differs from the synchronous trigger signal directly output by the fuse control unit 2, the synchronous trigger signal output module 2e must include a level conversion circuit. When the current driving capability of the input trigger signal required by the target control device is large, the synchronous trigger signal output module 2e must include a drive buffer circuit. When isolation, level conversion, and drive buffering are not required in the application, the synchronous trigger signal output module 2e does not require additional circuitry and relies solely on the main control chip in the fuse main control module 2a to directly output the synchronous trigger signal. The independent delay and signal polarity configuration of each synchronous trigger signal output channel are set through the human-machine interface module 1e of the wireless remote control unit 1 and transmitted to the fuse control unit 2 for execution via low-power radio frequency wireless communication.

[0021] The human-machine interaction module 2f integrates buttons and display components, which are used to bypass discharge and monitor the working status of the fuse control unit 2 locally via buttons, and can also be used to browse and set the working parameters of the fuse control unit 2 locally.

[0022] The power management module 2g consists of a voltage conversion circuit and a battery management circuit. It is responsible for converting the battery voltage into the voltage required for the operation of each module of the fuse control unit 2, and realizing battery power monitoring and charging protection control.

[0023] The fusible electrode circuit 3 consists of one or more fusible electrodes, a buffer inductor, and wires connecting the fusible electrodes and the buffer inductor in series. The number of fusible electrodes depends on the actual suspension requirements of the model. The fusible electrodes adopt a separate combination structure of metal frame and insulator, with embedded resistance wires and their supports. They are installed at the suspension points inside the model, with the embedded resistance wires in contact with the model's suspension wires. They also serve as the connection between the suspension wires and the model, and as the suspension wire fuse. All the resistance wires and buffer inductors in the fusible electrodes are connected in series in a circuit to the discharge output interface of the high-voltage energy storage discharge module 2d of the fusible control unit 2. This allows the large current released by the fusible control unit 2 to flow synchronously, and the buffer inductor, in conjunction with the high-power diode in anti-parallel connection on the discharge interface of the fusible control unit 2, provides current freewheeling. This continuously heats the resistance wires in the fusible electrodes, synchronously fusing the suspension wires at each suspension point on the model, thus achieving synchronous model release.

[0024] The remote monitoring unit 4 is a device that includes input and display functions as well as communication functions that match the wired communication module 5 in the wireless remote control unit 1. It is used to conduct remote two-way interactive communication with the wireless remote control unit 1 to realize the remote setting and status monitoring of the working parameters of the wireless remote control unit 1 and the fuse control unit 2. This provides a safe and reliable long-distance monitoring function for application scenarios, especially dangerous wind tunnel test scenarios, making it easier to detect and handle abnormal situations in a timely manner and reduce invalid test situations.

[0025] The workflow of this invention is as follows: First, according to application requirements, the fuse control unit 2 and fuse electrode circuit 3 of the device of this invention are installed inside the model to be released. The wireless remote control unit 1 is installed outside the model at a position that does not affect the model's wind tunnel test and facilitates the establishment of radio frequency wireless and infrared remote control communication with the fuse control unit 2 in the model. The model release control signal line in the wind tunnel is connected to the wireless remote control unit 1. The optional remote monitoring unit 4 is placed in the control room and connected to the wireless remote control unit 1 via a communication cable. Second, the position of the wireless remote control unit 1 is adjusted by heartbeat monitoring to establish stable radio frequency wireless and infrared remote control dual-mode communication. According to application requirements, the parameters of each fuse control unit 2 are configured and initialized through the wireless remote control unit 1 or the optional remote monitoring unit 4. Third, the charging preparation command is issued directly by operating the wireless remote control unit 1 or through the optional remote monitoring unit 4. Each model's fuse control unit 2 enters a charging state. Once it reaches a preset voltage, it reports a ready state. Then, after receiving the external model release control signal TRIG and after a custom delay set in the wireless remote control unit 1, the wireless remote control unit 1 synchronously sends a high-frequency short-coded infrared remote control release command to the fuse control unit 2 in each model to be released. Upon receiving the high-frequency short-coded infrared remote control release command and after an independent custom delay, the fuse control unit 2 in each model immediately triggers the control to discharge to the fuse electrode circuit 3, thereby synchronously fusing the model suspension wires and completing the synchronous fusing release of multiple suspension points in a single model or multiple suspension points in multiple models. At the same time, after an independent custom delay, a synchronous trigger signal is sent to trigger other devices to work. Finally, the working status and key operation logs of the wireless remote control unit 1 and the fuse control unit 2 are optionally recorded in the wireless remote control unit 1 or the remote monitoring unit 4.

[0026] The advantages of this invention are as follows: It employs a high-frequency, narrow-pulse, short-code method to transmit high-power infrared remote control commands, and combines this with narrow-spectrum filtering, transimpedance amplification, narrow-band filtering, hardware demodulation, and digital short-code detection technology to receive infrared remote control commands. This significantly improves the wireless remote control's ability to resist electromagnetic interference and complex thermal infrared interference, effectively ensuring low-latency remote control, extending the infrared remote control distance, and enhancing the infrared remote control information capacity. The use of a mature low-power wireless radio frequency communication scheme ensures the reliability and low power consumption of bidirectional data interaction. The use of single-stage or multi-stage charging schemes allows for flexible optimization of charging speed according to different application requirements. The use of digital variable pulse width chopper discharge control and the insertion of a current buffer inductor in the fuse electrode circuit significantly reduces the transient maximum thermal stress on the resistance wire in the fuse electrode, thereby reducing its vaporization phenomenon, extending its service life, and improving reliability. Furthermore, when the number of fuse electrodes in the fuse electrode circuit is small and the resistance value is reduced, the discharge time can be matched by adjusting the size of the buffer inductor. The invention optimizes discharge performance and energy utilization efficiency. Both the wireless remote control unit and the fuse control unit support independent programmable delays. The fuse control unit supports programmable discharge time windows and outputs multiple independently programmable delayed synchronous trigger signals, thus flexibly meeting the delayed release requirements of various wind tunnel tests and the synchronous delayed triggering requirements of multiple devices. Both the wireless remote control unit and the fuse control unit support abnormal reset detection and automatically resume operation from the state before the abnormal reset, effectively preventing work process interruptions or logical chaos caused by unilateral abnormal resets of either the wireless remote control unit or the fuse control unit. An optional remote monitoring unit provides a safe and reliable long-distance monitoring option for application scenarios, effectively helping to handle abnormal situations promptly and avoid invalid tests. Therefore, compared with existing technologies, this invention provides a low-latency, high-reliability wireless synchronous release device with enhanced anti-interference, robustness, and ease of use, suitable for single or multiple models. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an enhanced wireless synchronous release device for multi-model wind tunnel testing according to the present invention;

[0028] Figure 2 This is a functional block diagram of the wireless remote control unit in the device of the present invention;

[0029] Figure 3 This is a circuit topology diagram of the infrared command transmission module in the wireless remote control unit of the device of the present invention;

[0030] Figure 4 This is a schematic diagram of a switch control signal for a high-frequency narrow pulse short-coded infrared remote control release command transmitted by the wireless remote control unit in the device of the present invention;

[0031] Figure 5This is a schematic diagram of a switch control signal for a high-frequency narrow pulse short-coded infrared remote control handshake command transmitted by the wireless remote control unit in the device of the present invention.

[0032] Figure 6 This is a functional block diagram of the fuse control unit in the device of the present invention;

[0033] Figure 7 This is a schematic diagram of the infrared command receiving module in the fuse control unit of the present invention;

[0034] Figure 8 This is a schematic diagram of the signal waveform when the infrared command receiving module in the device of the present invention receives an infrared remote control handshake command;

[0035] Figure 9 This is a schematic diagram of a single-stage charging circuit structure in the high-voltage energy storage and discharge module of the fuse control unit of the present invention.

[0036] Figure 10 This is a schematic diagram of a three-level charging circuit structure in the high-voltage energy storage and discharge module of the fuse control unit of the present invention.

[0037] Figure 11 This is a schematic diagram of the discharge control circuit structure in the high-voltage energy storage discharge module of the fuse control unit of the present invention;

[0038] Figure 12 This is a schematic diagram of the digital variable pulse width chopper switch control signal used in the discharge control of the high-voltage energy storage discharge module of the fuse control unit of the present invention.

[0039] Figure 13 This is a circuit topology diagram of the fusible electrode circuit in the device of the present invention; Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings:

[0041] The design concept of this invention is to address the shortcomings of wireless synchronous release control of models in terms of low latency, resistance to complex electromagnetic and thermal infrared interference, and high reliability under different wind tunnel test conditions, such as single-model multi-point suspension or multi-model multi-point suspension. This invention provides an enhanced single / multi-model wireless synchronous release device based on short-code infrared remote control and variable pulse width chopper discharge control, and has remote monitoring capabilities to meet the diverse wind tunnel test requirements such as free flight of models or externally attached models. To address the issues of high command latency caused by complex protocols or lengthy encoding in traditional wireless remote control, and the susceptibility of uncoded infrared signals to interference in the complex electromagnetic and thermal infrared environments of wind tunnels, leading to false triggering or missed triggering, this invention employs a dual-mode communication method combining low-latency infrared coded communication and low-power radio frequency communication between the wireless remote control unit and the fuse release control unit. The wireless remote control unit transmits a high-frequency, short-coded infrared signal to transmit the fuse release command. Each fuse release control unit utilizes the narrow-spectrum infrared filtering, transimpedance amplification, hardware demodulation, and software digital encoding detection of the infrared receiving probe to achieve ultra-low latency and reliable reception of the command, thus realizing low-latency fuse release remote control resistant to complex electromagnetic and thermal infrared interference. Simultaneously, the wireless remote control unit achieves bidirectional data interaction with each fuse release control unit via low-power radio frequency communication for parameter configuration and status feedback, and supports connection to a remote monitoring unit via a wired interface for remote parameter setting and operational status feedback. Addressing the issues of resistance wire vaporization due to thermal stress during discharge and low capacitor energy utilization efficiency when the number of fuse electrodes is small, this invention proposes to improve the fuse electrode circuit... The design incorporates one or more fusible electrodes connected in series with a buffer inductor, combined with a digital variable pulse width chopper discharge control scheme to optimize the discharge process. This ensures effective fusing duration while improving capacitor energy utilization efficiency under conditions with a limited number of fusible electrodes, thereby reducing the risk of vaporization, extending the life of the resistance wire, and enhancing test reliability. Addressing the issue of task interruption or logic chaos caused by abnormal resets of control units in high-cost wind tunnel tests, this invention employs a low-power main control chip as the control core in both the wireless remote control unit and the fusible control unit, endowing them with abnormal reset state memory and recovery functions. Furthermore, it enhances system robustness through a wireless radio frequency network supporting dynamic node management, ensuring reliable continuation of the test process even after a partial failure. To address the diverse requirements of different wind tunnel tests regarding release timing and coordinated actions of internal model equipment, this invention includes independent programmable delay functions in both the wireless remote control unit and the fusible control unit. It also adds multiple independently programmable delayed synchronous trigger signal outputs to the fusible control unit, flexibly adapting to various timing requirements and achieving precise coordinated control of other internal model equipment. In summary, this invention addresses the core requirement of wireless synchronous release control for models in wind tunnel tests by constructing an enhanced wireless synchronous release device consisting of a wireless remote control unit 1, a fuse control unit 2, a fuse electrode circuit 3, and a remote monitoring unit 4. Its overall structural topology is as follows: Figure 1 As shown.

[0042] The wireless remote control unit 1 consists of a remote control main control module 1a, a release control signal input module 1b, an infrared command transmission module 1c, a wireless radio frequency communication module 1d, a wired communication module 1e, a human-machine interaction module 1f, and a power management module 1g. Its functional structure topology is as follows: Figure 2 As shown, the functionality of each module depends on the hardware circuitry and the software strategy within the main control chip.

[0043] The remote control main control module 1a preferably uses a low-power microcontroller with non-volatile random access memory as the main control chip, such as the MSP430FR series microcontroller. It consists of the main control chip and the crystal oscillator circuit, reset circuit, and program download / debugging circuit necessary for its operation. The software uniformly schedules and coordinates the collaborative work of each module in the wireless remote control unit 1 to realize the function of the wireless remote control unit 1. During each startup initialization phase, the software of the remote control main control module 1a detects the reset mode by reading a specific reset source flag register inside the main control chip to distinguish between different types of resets, such as normal power-on reset, watchdog reset, and external reset. In the case of a normal reset, the software executes a complete system initialization process, including initializing the hardware interface and internal state variables of the wireless remote control unit 1. Then, it sends initialization commands to each fuse control unit 2 via the wireless radio frequency communication module 1d, guiding them to complete their own state initialization. In the case of an abnormal reset (such as a watchdog reset), the software does not perform conventional initialization. Instead, it directly reads and restores the entire working process state and parameter configuration of the wireless remote control unit 1 saved before the abnormal reset from non-volatile memory, and seamlessly continues execution of this process state. This mechanism avoids the interruption or logical chaos of the entire device's working process due to a unilateral unexpected restart of the wireless remote control unit 1 in practical applications, significantly improving the robustness of the device's operation and minimizing the risk of failure in high-cost wind tunnel tests.

[0044] The release control signal input module 1b consists of a hardware-level pulse interference suppression circuit, a level conversion circuit, and a software-programmable pulse detection synchronization window. Through the combination of hardware and software, it effectively avoids narrow pulse interference on the fuse release control signal input port and correctly identifies valid model release control signals TRIG that exceed the specified duration, thereby improving the reliability of the device and avoiding invalid triggering in wind tunnel tests. The pulse interference suppression circuit can use an RC low-pass filter composed of resistors and capacitors or a pulse group suppression circuit containing transient voltage suppressor diodes (TVS), varistors (MOV), or ferrite beads to effectively filter out high-frequency noise and pulse group interference. The level conversion circuit uses a resistor voltage divider circuit to convert high-voltage logic levels to low-voltage logic levels, or uses a level conversion chip to convert different logic levels. This is used to convert logic levels when the logic level of the model release control signal TRIG does not match the logic level of the main control chip in the remote control module 1a. For example, it can convert the common 5V logic level model release control signal TRIG into a control signal with a logic level of 2.5V~3.3V that can be received by common low-power microcontrollers. The software-programmable pulse detection synchronization window is directly implemented by the timing module in the remote control module 1a. That is, only when the effective trigger level of the TRIG signal lasts longer than the synchronization window duration is it determined to be a valid model release control signal, so as to further enhance the suppression capability of narrow pulse interference.

[0045] The infrared command transmission module 1c consists of a hardware circuit module comprising a communication encoding modulation circuit, a logic AND gate circuit, a switch driver circuit, and a high-power infrared transmission circuit, along with a software control strategy for high-frequency, narrow-pulse, short-code infrared transmission. The high-power infrared transmission circuit comprises a small-value resistor, a high-power infrared LED (IR), and a high-frequency switch. One circuit topology of the infrared command transmission module 1c is shown below. Figure 3As shown. The main control chip in the remote control module 1a outputs a high-frequency narrow pulse switch signal S1 via software control, and also drives the communication encoding modulation circuit to output a short encoded signal S2. After the high-frequency narrow pulse switch signal S1 and the short encoded signal S2 are logically ANDed, the switch drive circuit is controlled to drive the high-frequency switch in the high-power infrared emitting circuit to perform a switching action, thereby controlling the infrared emitting tube in the high-power infrared emitting circuit to emit a high-power high-frequency infrared remote control command S3 with short encoded information. The infrared remote control command S3 includes, but is not limited to, infrared remote control handshake command and infrared remote control release command, and is used for monitoring the low-latency infrared encoded communication connection status and synchronously controlling the discharge of the fuse control unit 2 in each model to the fuse electrode circuit 3. Accordingly, the infrared command transmission module 1c uses infrared communication to suppress complex environmental electromagnetic interference, enhances its immunity to ambient light and complex thermal infrared interference through a software control strategy of high frequency and short code modulation, and achieves effective low-latency infrared remote control. It also uses a narrow pulse drive software control strategy and a high-power infrared transmission circuit to enhance the infrared remote control distance and range. In addition, it uses the information carrying capacity of short codes to transmit different low-latency infrared remote control commands, and uses software programmable delay to achieve delayed transmission of infrared remote control commands with custom delay times, thereby ensuring the synchronous transmission of infrared remote control commands with long duration, high reliability, low latency, and custom delay times. The high-frequency narrow pulse switching signal S1 can be output by the PWM module of the microcontroller, with a frequency generally greater than 10kHz and a duty cycle generally between 1 / 5 and 1 / 3. The short encoded signal S2 can be directly output by the output pin of the microcontroller's general asynchronous serial communication interface, with a 4-8 bit encoding in principle. The encoding communication baud rate is less than the high-frequency narrow pulse switching frequency and generally does not exceed 1 / 10 of the high-frequency narrow pulse switching frequency, ensuring the integrity of the high-frequency short encoded infrared command and low communication latency. For example, when using a 100kHz high-frequency switching signal, 4-bit encoding, and a 10kHz encoding communication baud rate, a delay of less than 0.5ms can be achieved. Figure 4 The diagram shows a switch control signal corresponding to a high-frequency short-coded infrared remote control release command with the code 0101. Figure 5 The diagram shows a switch control signal for a high-frequency short-coded infrared remote control handshake command corresponding to code 0011; the high-power infrared emitting circuit is composed of a high-power infrared emitting tube connected in series with a small-value current-limiting resistor, and operates under high-current drive.

[0046] The wireless radio frequency communication module 1d adopts a low-power radio frequency wireless communication scheme that supports broadcast transmission and point-to-point transmission, preferably Bluetooth, Zigbee, or StarFlash schemes. It is used for bidirectional data interaction and heartbeat packet transmission between the wireless remote control unit 1 and the fuse control units 2 in each model, so as to realize the wireless setting of the working parameters and monitoring of the working status of each fuse control unit 2. The software of the wireless radio frequency communication module 1d adopts a dynamic connection management mode to maintain a list of fuse control units 2 wirelessly connected to the wireless remote control unit 1, so that it can automatically adapt to the wireless communication connection requirements of different numbers of fuse control units 2 in different application scenarios and automatically restore the connection after the node connection anomaly of the fuse control unit 2 is eliminated, thereby improving the robustness of the system. For example, the wireless remote control unit 1 actively scans to discover available fuse control units 2 in the vicinity and adds their device addresses and statuses to the dynamically maintained connection list. The system periodically polls and exchanges heartbeat packets with each node according to this list. When a node in the list fails to respond to three consecutive handshake communication attempts, the node is determined to be in communication abnormality, and is temporarily marked as offline. The system displays the message or transmits it to the remote monitoring unit 4. If the node subsequently resumes communication and is detected again, the system automatically adds it back to the valid connection list and manages it, thereby achieving automatic recovery after the connection abnormality is resolved.

[0047] The wired communication module 1e preferably uses a differential wired communication scheme, such as 485 communication or CAN communication with strong anti-interference capabilities, to receive parameter setting instructions, remote operation instructions, and data request instructions from the remote monitoring unit 4 and perform corresponding settings, operations, and status feedback, thereby realizing remote monitoring and improving the convenience of application.

[0048] The human-machine interface module 1f integrates buttons and display components for locally browsing, setting, and monitoring the operating parameters and status of the wireless remote control unit 1 and each of the fuse control units 2. In specific implementations, the human-machine interface module 1f typically includes two or more buttons, a low-power LCD screen or digital tube, LED status indicators, etc., which can display parameters such as the device status, the list of connected nodes, and the voltage of each node. It also supports modifying the charging voltage, delay parameters, and device status via buttons.

[0049] The power management module 1g consists of a voltage conversion circuit and a battery management circuit. It is responsible for converting the battery voltage into the voltage required for the operation of each module of the wireless remote control unit 1, and realizing battery power monitoring and charging protection control. The voltage conversion circuit usually uses a DC-DC converter and a low dropout linear regulator to achieve high efficiency and high accuracy. The battery management circuit mainly consists of a charging process management circuit, an overvoltage and overcurrent charging protection circuit, and a battery power detection circuit.

[0050] The fuse control unit 2 consists of a fuse main control module 2a, a wireless radio frequency communication module 2b, an infrared command receiving module 2c, a high-voltage energy storage and discharge module 2d, a synchronous trigger signal output module 2e, a human-machine interaction module 2f, and a power management module 2g; its functional structure topology is as follows: Figure 6 As shown, the functionality of each module depends on the hardware circuitry and the software strategy within the main control chip.

[0051] The fuse control module 2a preferably uses a low-power microcontroller with non-volatile random access memory (NRAM) as the main control chip, such as the MSP430FR series microcontroller. It consists of the main control chip and the necessary crystal oscillator circuit, reset circuit, and program download / debugging circuit. Software uniformly schedules and coordinates the collaborative work of each module in the fuse control unit 2 to realize the functions of the fuse control unit 2. During each startup initialization phase, the fuse control module 2a software reads a specific reset source flag register inside the main control chip to detect the reset mode, distinguishing between different types of resets such as normal power-on reset, watchdog reset, and external reset. During a normal reset, complete hardware initialization and state variable clearing are performed. During an abnormal reset, conventional initialization is not performed; instead, the entire working process state and parameter configuration of the fuse control unit 2, previously saved, are directly read from the NRAM and restored, seamlessly continuing execution from this process state.

[0052] The wireless radio frequency communication module 2b adopts the same low-power radio frequency wireless communication scheme as the wireless radio frequency communication module 1d in the wireless remote control unit 1, such as Bluetooth, Zigbee or StarFlash, for bidirectional interactive communication between the fuse control unit 2 and the wireless remote control unit 1, so as to realize the wireless setting of the working parameters and monitoring of the working status of the fuse control unit 2 by the wireless remote control unit 1.

[0053] The infrared command receiving module 2c consists of a hardware component comprising an infrared receiving probe, a transimpedance amplifier circuit, a narrowband filter circuit, and a hardware demodulation circuit, as well as software digital encoding detection technology, such as... Figure 7As shown, the infrared receiving probe consists of a narrow-spectrum infrared filter and a high-sensitivity infrared phototube. The infrared light signal of the short-coded infrared remote control command sent by the wireless remote control unit 1 is first filtered by the narrow-spectrum infrared filter and then received by the infrared receiving tube to enhance the anti-interference capability against complex infrared signals in the environment from the optical path. The output signal of the infrared receiving tube is amplified by the transimpedance amplifier circuit and then filtered by the narrow-band filter circuit to further suppress infrared interference in the same spectrum in the environment and amplify the effective infrared remote control signal. Then, it is demodulated into a short-coded digital signal by the low-latency hardware demodulation circuit and sent to the digital input port of the main control chip in the fuse main control module 2a. The encoded value of the short-coded infrared remote control command is obtained by the software digital encoding detection in the main control chip, and then the corresponding interactive or control operation is performed according to the encoded value of the infrared remote control command. The short-coded remote control ensures low latency; the execution of the corresponding control operation according to the code further improves the anti-interference capability of the device of the present invention. Among them, the center frequency of the narrow-spectrum infrared filter needs to be matched with the wavelength of the infrared receiver tube and the infrared transmitter tube in the wireless remote control unit 1; the narrow-band filter circuit can be composed of a bandpass filter; the hardware demodulation circuit is composed of a comparator, a low-pass filter, and an edge shaping circuit, which converts the high-frequency short-coded signal into a coded digital level signal. Figure 8 The diagram shows the output signal waveforms of each circuit when the infrared command receiving module 2c receives the infrared remote control handshake command coded as 0011. The transimpedance amplifier circuit converts the photocurrent signal output by the infrared receiving probe into a voltage signal S4. After being filtered by a narrowband bandpass filter, the output voltage signal waveform is S5. Then, it is demodulated by the hardware demodulation circuit to obtain a short coded digital signal S6. The signal S6 is sent to the GPIO pin with interrupt function of the main control chip or the data receiving pin of the general asynchronous serial communication module. The code is detected bit by bit by the software program or directly received and saved by the asynchronous serial communication module and read out by the software for judgment.

[0054] The high-voltage energy storage discharge module 2d consists of a hardware circuit comprising a boost circuit, a single / multi-stage charging circuit, a high-voltage energy storage capacitor, a charging voltage detection circuit, and a discharge control circuit, and a software control strategy for digital variable pulse width chopper discharge control. The boost circuit typically employs an isolated DC-DC boost circuit to raise the low voltage supplied by the battery to the high voltage required for high-power discharge of the fuse electrode circuit 3, for example, 100V~300V. The single / multi-stage charging circuit consists of one or more solid-state switching circuits, used to charge the high-voltage energy storage capacitor using the high-voltage power supply output from the boost circuit. The choice between a single-stage or multi-stage charging circuit, and the specific charging stage, is determined comprehensively based on the target charging voltage, charging speed, and the overall size requirements of the fuse control unit 3. A schematic diagram of the single-stage charging circuit is shown below. Figure 9 As shown in the diagram, the three-level charging circuit structure is as follows: Figure 10As shown. The high-voltage energy storage capacitor uses a large-capacity, high-voltage capacitor to maximize the stored energy and discharge time constant. The charging voltage detection circuit is used to detect the voltage across the high-voltage energy storage capacitor in real time, quantize it digitally, and feed it back to the fuse control module 2a for software charging control, while simultaneously transmitting it back to the wireless remote control unit 1. The discharge control circuit consists of a high-power switching transistor and its isolation drive circuit, and a discharge interface circuit, as shown. Figure 11 As shown; a high-power switching transistor is connected in series in the main discharge circuit between the output of the high-voltage energy storage capacitor and the discharge interface. A high-power freewheeling diode is connected in reverse parallel on the discharge interface. The fuse control signal output by the fuse control module 2a drives the MOS transistor to switch on and off via the isolation drive circuit to achieve high-power discharge of the fuse electrode circuit 3. The bypass discharge circuit consists of a manual button, a solid-state switch, and a discharge current-limiting resistor. Bypass discharge can be performed manually or by software control. During the testing and maintenance of the device, the voltage across the high-voltage energy storage capacitor can be reduced to a safe voltage range by manually bypassing the energy on the high-voltage energy storage capacitor. In terms of software control, the target voltage for single-level or multi-level charging can be set by software programming. The fuse control signal for switching the high-power switching transistor on and off in the drive discharge control circuit is generated by a digital variable pulse width chopper control method, preferably with a pulse width scheme of first pulse width and subsequent pulse widths, such as... Figure 12 As shown in S7, the device accelerates the heating of the resistance wire in the fusible electrode and limits the maximum thermal stress. It also supports custom delay and custom discharge window duration, thereby enabling custom delay variable pulse width chopper discharge control of the fusible electrode circuit 3 according to the needs of different wind tunnel test scenarios. While ensuring the effective discharge window width and discharge energy, it reduces the vaporization phenomenon of the resistance wire in the fusible electrode circuit 3 due to high thermal stress in the initial high-voltage discharge stage of the high-voltage energy storage capacitor, thereby improving the working life of the resistance wire in the fusible electrode circuit 3 and further improving the working reliability of the device of the present invention.

[0055] The synchronous trigger signal output module 2e consists of a drive buffer circuit and an independent programmable delay and programmable polarity configuration software control strategy. It is used to independently delay and output single or multiple synchronous trigger signals to other working devices after receiving trigger control commands from other devices transmitted via radio frequency wireless communication or infrared remote control release commands. The drive buffer circuit is used to convert the trigger signal output by the fuse control unit 2's fuse main control module 2a into a digital control trigger signal required for external device operation. This includes necessary isolation circuits, level conversion circuits, drive buffer circuits, or combinations thereof for different scenarios. When an isolated synchronous trigger output signal is required in the application, the synchronous trigger signal output module 2e must include an isolation circuit. When the logic level of the input trigger signal required by the target control device differs from the synchronous trigger signal directly output by the fuse control unit 2, the synchronous trigger signal output module 2e must include a level conversion circuit. When the current driving capability of the input trigger signal required by the target control device is large, the synchronous trigger signal output module 2e must include a drive buffer circuit. When isolation, level conversion, and drive buffering are not required in the application, the synchronous trigger signal output module 2e does not require additional circuitry and relies solely on the main control chip in the fuse main control module 2a to directly output the synchronous trigger signal. The independent delay and signal polarity configuration of each synchronous trigger signal output channel are set through the human-machine interface module 1e of the wireless remote control unit 1 and transmitted to the fuse control unit 2 for execution via low-power radio frequency wireless communication.

[0056] The human-machine interface module 2f integrates buttons and a display component. It is used for local bypass discharge and monitoring of the operating status of the fuse control unit 2 via the buttons. It can also be used for local browsing and setting of the operating parameters of the fuse control unit 2. When local setting of operating parameters is not required, the human-machine interface module 2f only needs to include one button and one LED indicator for local bypass discharge and operating status indication. When local setting of operating parameters is required, at least two buttons, a set of low-power digital tubes or displays, and LED status indicators are needed.

[0057] The power management module 2g consists of a voltage conversion circuit and a battery management circuit. It is responsible for converting the battery voltage into the voltage required for the operation of each module of the fuse control unit 2, and for monitoring battery power and controlling charging protection. The voltage conversion circuit 2g typically uses a DC-DC converter paired with a low-dropout linear regulator to achieve high efficiency and high accuracy. The battery management circuit mainly consists of a charging process management circuit, an overvoltage and overcurrent charging protection circuit, and a battery power detection circuit.

[0058] The fusible electrode circuit 3 consists of one or more fusible electrodes, a buffer inductor, and wires connecting the fusible electrodes and the buffer inductor in series. Its electrical connection principle is illustrated in the diagram below. Figure 13As shown, the number of fusible electrodes depends on the actual suspension requirements of the model. The fusible electrodes adopt a separate combination structure of metal frame and insulator, with embedded resistance wires and their supports. They are installed at the suspension points inside the model, with the embedded resistance wires in contact with the model's suspension lines. They simultaneously function as a connector between the suspension lines and the model, and as a suspension line fuse. All the resistance wires and buffer inductors in the fusible electrodes are connected in series in a loop to the discharge output interface of the high-voltage energy storage discharge module 2d of the fusible control unit 2. This allows the large current released by the fusible control unit 2 to flow synchronously, and the buffer inductor, in conjunction with the high-power diode in anti-parallel connection on the discharge interface of the fusible control unit 2, provides current follow-through. This continuously heats the resistance wires in the fusible electrodes, synchronously fusing the suspension lines at each suspension point on the model, thus achieving synchronous model release. In specific implementations, the metal frame can be machined from stainless steel, providing threaded holes for connection with the model body. The insulators can be made of high-strength alumina ceramic, fixed to the insulating grooves of the metal frame by epoxy resin bonding or mechanical pressing. Its frame consists of a stainless steel support base and a top cover. The insulator is made of alumina ceramic. The resistance wire can be made of nickel-chromium alloy wire. The buffer inductor connected in series on the fusible electrode circuit 3 can be a power type magnetic ring inductor.

[0059] The remote monitoring unit 4 is a device that includes input and display functions, as well as communication functions matching the wired communication module 5 in the wireless remote control unit 1. It is used for remote two-way interactive communication with the wireless remote control unit 1, enabling remote setting and status monitoring of the operating parameters of the wireless remote control unit 1 and the fuse control unit 2. This provides a safe and reliable long-distance monitoring function for application scenarios, especially hazardous wind tunnel testing scenarios, facilitating timely observation and handling of abnormal situations and reducing invalid testing. In application, the remote monitoring unit 4 can be a computer equipped with monitoring software, or a programmable configuration screen with communication and touch input functions.

[0060] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An enhanced wireless synchronous release device for multi-model wind tunnel testing, based on a synchronous release scheme that uses instantaneous high-current heating of a resistance wire to fuse and break the model suspension wire, is used for wireless remote-controlled synchronous release of single or multiple models in wind tunnel free-flight tests or external model release tests. It adopts a split design and consists of four parts: a wireless remote control unit 1, a fuse control unit 2, a fuse electrode circuit 3, and a remote monitoring unit 4. Its features are: The wireless remote control unit 1 is located outside the model and is used for local interactive setting of working parameters and monitoring of working status. Simultaneously, it receives external input model release control signals and remotely controls the fuse control units 2 installed inside each model to discharge to the fuse electrode circuit 3, achieving synchronous heating and fuse release of the model suspension wires. Additionally, it receives working parameter settings from the remote monitoring unit 4 via wired communication and provides feedback on the working status, thus achieving convenient remote monitoring of multi-model wireless synchronous fuse release. The wireless remote control unit 1 and the fuse control units 2 employ a dual-mode communication method combining low-latency infrared short-code communication and low-power radio frequency communication. The wireless remote control unit 1 transmits model release commands by transmitting high-frequency short-code infrared signals. The fuse control units 2 inside each model utilize the narrow-spectrum infrared filtering, transimpedance amplification, hardware demodulation, and software digital encoding detection of the infrared receiving probe to achieve ultra-low latency reliable reception of the high-frequency short-code infrared commands, thereby achieving low-latency fuse release remote control against complex electromagnetic and thermal infrared interference. The wireless remote control unit 1 uses low-power radio frequency communication to control each fuse... The control unit 2 features reliable parameter settings and status interaction. The fuse control unit 2 uses boost charging and high-voltage capacitor energy storage to buffer energy. It employs digital variable pulse width chopper control to control the capacitor to discharge at a high power for a short time through a programmable window into the fuse electrode circuit 3, which contains one or more fuse electrodes and a buffer inductor. This allows the resistance wires of each fuse electrode to heat up synchronously and rapidly, fusing the model suspension wire. The fuse electrode uses a separate metal frame and insulator design, embedding the resistance wire and its support. It simultaneously functions as a connector between the suspension wire and the model, and as a suspension fuse. The resistance wire is connected in series in the fuse electrode circuit and reliably contacts the model suspension wire. Both the wireless remote control unit 1 and the fuse control unit 2 use a low-power main control chip as the control core, are battery powered, and each supports independent programmable delays to meet the needs of customized delayed fuse triggering and release under different wind tunnel test conditions. The fuse control unit 2 also has single or multiple independently programmable delayed synchronous trigger signal outputs for customized delayed operation triggering of other equipment inside the model in different wind tunnel tests.

2. The enhanced wireless synchronous release device for multi-model wind tunnel testing as described in claim 1, characterized in that: The wireless remote control unit 1 uses a low-power main control chip as its control core and is battery powered. It serves as the local interactive terminal and communication control relay for the device of this invention. It receives external model release control signals (TRIG) via a wired connection. It sends low-latency commands to the fuse control unit 2 and performs bidirectional data interaction using a dual-mode communication method combining low-latency infrared coded communication and low-power radio frequency communication. It also interacts with the remote monitoring unit 4 via a wired communication method, thereby realizing local working parameter configuration, wireless forwarding of model release control signals (TRIG), and relay functions for remote monitoring. Accordingly, the wireless remote control unit 1 consists of a remote control main control module 1a, a release control signal input module 1b, an infrared command transmission module 1c, a wireless radio frequency communication module 1d, a wired communication module 1e, a human-machine interaction module 1f, and a power management module 1g. The functionality of each module depends on the hardware circuitry and the software strategy in the main control chip. The remote control main control module 1a consists of a low-power main control chip and the necessary crystal oscillator circuit, reset circuit, and program download / debugging circuit. It coordinates and schedules the collaborative work of each module in the wireless remote control unit 1 through software, thereby realizing the functions of the wireless remote control unit 1. During each startup initialization phase, the software of the remote control main control module 1a performs a reset mode detection to distinguish between normal and abnormal resets. In the case of a normal reset, after initializing the state of the wireless remote control unit 1 itself, the software in the remote control main control module 1a sends an initialization command to each of the fuse control units 2 via the wireless radio frequency communication module 1d to allow each fuse control unit 2 to perform state initialization. In the case of an abnormal reset, the software in the remote control main control module 1a reads the working process state of the wireless remote control unit 1 from the non-volatile memory before the abnormal reset and continues execution of this process state. This avoids interruption of the entire device's working process or logical chaos due to a unilateral unexpected restart of the wireless remote control unit 1 in practical applications, improving the robustness of the device's operation and minimizing the risk of failure in high-cost wind tunnel tests. The release control signal input module 1b consists of a hardware-level pulse interference suppression circuit, a level conversion circuit, and a software-programmable pulse detection synchronization window. This hardware-software combination effectively avoids narrow pulse interference on the model release control signal input port and correctly identifies valid model release control signals (TRIGs) exceeding a specified duration, thereby improving the reliability of the device and preventing invalid triggering during wind tunnel testing. The pulse interference suppression circuit employs an RC low-pass filter composed of resistors and capacitors or a pulse group suppression circuit containing transient voltage suppression diodes (TVS), varistors (MOVs), or ferrite beads to effectively filter out high-frequency noise. Sound and pulse group interference; the level conversion circuit uses a resistor voltage divider circuit to convert high voltage logic level to low voltage logic level, or uses a level conversion chip to convert different logic levels, so as to perform logic level conversion when the logic level of the model release control signal TRIG does not match the logic level of the main control chip in the remote control main control module 1a; the software programmable pulse detection synchronization window is directly implemented by the timing module in the remote control main control module 1a, that is, only when the effective trigger level of the TRIG signal lasts for more than the duration of the synchronization window is it determined to be a valid model release control signal, so as to further enhance the ability to suppress narrow pulse interference; The infrared command transmission module 1c consists of a hardware circuit module comprising a communication encoding modulation circuit, a logic AND gate circuit, a switch driving circuit, and a high-power infrared transmission circuit, along with a software control strategy for high-frequency, narrow-pulse, short-code infrared transmission. The high-power infrared transmission circuit comprises a small-value resistor, a high-power infrared LED (IR), and a high-frequency switch. The main control chip in the remote control main control module 1a outputs a high-frequency narrow-pulse switch signal via software control, and also drives the communication encoding modulation circuit to output a short-code signal. After a logical AND operation between the high-frequency narrow-pulse switch signal and the short-code signal, the switch driving circuit is controlled to drive the high-frequency switch in the high-power infrared transmission circuit to perform a switching action, thereby controlling the infrared LED in the high-power infrared transmission circuit to transmit a high-power high-frequency infrared remote control command with short-code information. The infrared remote control command includes, but is not limited to, an infrared remote control handshake. The infrared remote control release command is used to monitor the low-latency infrared coded communication connection status and synchronously remotely control the discharge of the fuse control unit 2 to the fuse electrode circuit 3 in each model. Accordingly, the infrared command transmission module 1c uses infrared communication to suppress complex environmental electromagnetic interference, uses a high-frequency, short-code modulation software control strategy to enhance the anti-interference capability against ambient light and complex thermal infrared interference and achieve effective low-latency infrared remote control, uses a narrow pulse drive software control strategy and a high-power infrared transmission circuit to enhance the infrared remote control distance and range, and uses the short-code information carrying capacity to transmit different low-latency infrared remote control commands. It also uses software programmable delay to realize the delayed transmission of infrared remote control commands with custom delay time, thereby ensuring the synchronous transmission of infrared remote control commands with long duration, high reliability, low latency and custom delay time. The wireless radio frequency communication module 1d adopts a low-power radio frequency wireless communication scheme that supports broadcast transmission and point-to-point transmission. It is used for bidirectional data interaction and heartbeat packet transmission between the wireless remote control unit 1 and the fuse control unit 2 in each model, so as to realize the wireless setting of the working parameters and monitoring of the working status of each fuse control unit 2. The software of the wireless radio frequency communication module 1d adopts a dynamic connection management mode to maintain the list of fuse control units 2 wirelessly connected to the wireless remote control unit 1, so that it can automatically adapt to the wireless communication connection requirements of different numbers of fuse control units 2 in different application scenarios and automatically restore the connection after the node connection anomaly of the fuse control unit 2 is eliminated, thereby improving the robustness of the system. The wired communication module 1e preferably uses a differential wired communication scheme to receive parameter setting instructions, remote operation instructions, and data request instructions from the remote monitoring unit 4, and to perform corresponding settings, operations, and status feedback, thereby realizing remote monitoring and improving the convenience of the application. The human-machine interaction module 1f integrates buttons and display components, and is used to browse, set and monitor the working parameters and working status of the wireless remote control unit 1 and each of the fuse control units 2 locally. The power management module 1g consists of a voltage conversion circuit and a battery management circuit. It is responsible for converting the battery voltage into the voltage required for the operation of each module of the wireless remote control unit 1, and realizing battery power monitoring and charging protection control.

3. The enhanced wireless synchronous release device for multi-model wind tunnel testing as described in claim 1, characterized in that: The fuse control unit 2 uses a low-power main control chip as its control core and is battery powered. It consists of a low-voltage control section and a high-voltage energy storage and discharge section, and is installed inside each model to be released. It uses narrow-spectrum infrared filtering, transimpedance amplification, hardware demodulation, and software digital encoding detection technology to achieve low latency, anti-interference, and high-reliability reception. It uses low-power radio frequency communication technology to interact with the wireless remote control unit 1 to complete the setting of working parameters and status feedback. It uses single-stage or multi-stage boost charging technology to control rapid high-voltage charging energy storage, and uses digital variable pulse width chopping when it receives the infrared remote control release command transmitted by the wireless remote control unit 1. Wave control technology controls the high-current discharge to the fuse electrode circuit 3 with programmable delay and programmable discharge time window to realize the fuse release model. At the same time, it supports single or multiple synchronous trigger signal outputs with independent programmable delays for triggering the operation of other devices in the model to be released. Accordingly, the fuse control unit 2 consists of a fuse main control module 2a, a wireless radio frequency communication module 2b, an infrared command receiving module 2c, a high-voltage energy storage discharge module 2d, a synchronous trigger signal output module 2e, a human-machine interaction module 2f, and a power management module 2g. The function implementation of each module depends on the hardware circuit and the software strategy in the main control chip. The fuse control module 2a consists of a low-power main control chip and the necessary crystal oscillator circuit, reset circuit, and program download / debugging circuit. It achieves the function of the fuse control unit 2 by uniformly scheduling and coordinating the collaborative work of each module in the fuse control unit 2 through software. During each startup initialization phase, the software of the fuse control module 2a performs a reset mode detection to distinguish between normal and abnormal resets. In the case of a normal reset, the software in the fuse control module 2a initializes the state of the fuse control unit 2 itself. In the case of an abnormal reset, the software in the fuse control module 2a reads the working process state of the fuse control unit 2 before the abnormal reset from non-volatile memory and continues execution of this process state. This avoids interruption of the entire device's working process or logical chaos due to a unilateral unexpected restart of the fuse control unit 2 in practical applications, improving the robustness of the device's operation and minimizing the risk of failure in high-cost wind tunnel tests. The wireless radio frequency communication module 2b adopts the same low-power radio frequency wireless communication scheme as the wireless radio frequency communication module 1d in the wireless remote control unit 1, and is used for bidirectional interactive communication between the fuse control unit 2 and the wireless remote control unit 1, so as to realize the wireless setting of the working parameters and monitoring of the working status of the fuse control unit 2 by the wireless remote control unit 1. The infrared command receiving module 2c consists of a hardware component comprising a narrow-spectrum infrared filter, an infrared receiver tube, a transimpedance amplifier circuit, a narrowband filter circuit, and a hardware demodulation circuit, as well as software digital encoding detection technology. The infrared light signal of the short-coded infrared remote control command sent by the wireless remote control unit 1 is first filtered by the narrow-spectrum infrared filter and then received by the infrared receiver tube, thereby enhancing the anti-interference capability against complex infrared signals in the environment from an optical path perspective. The output signal of the infrared receiver tube is amplified by the transimpedance amplifier circuit and then filtered by the narrowband filter circuit to further suppress infrared interference in the same spectrum and amplify the effective infrared remote control signal. It is then demodulated into a short-coded digital signal by the low-latency hardware demodulation circuit and sent to the digital input port of the main control chip in the fuse-based main control module 2a. The encoded value of the short-coded infrared remote control command is obtained through software digital encoding detection in the main control chip, and then corresponding interactive or control operations are performed based on the encoded value of the infrared remote control command. The short-coded remote control ensures low latency; executing corresponding control operations based on the encoding further improves the anti-interference capability of the device. The high-voltage energy storage and discharge module 2d consists of a hardware component comprising a boost circuit, a single / multi-stage charging circuit, a high-voltage energy storage capacitor, a charging voltage detection circuit, and a discharge control circuit, and a software control strategy for digital variable pulse width chopper discharge control. The boost circuit is used to increase the low voltage supplied by the battery to the high voltage required for high-power discharge of the fuse electrode circuit 3. The single / multi-stage charging circuit consists of one or more solid-state switching circuits, used to charge the high-voltage energy storage capacitor using the high-voltage power supply output from the boost circuit. The single-stage charging circuit is selected based on the target charging voltage, charging speed, and the overall size requirements of the fuse control unit 3. This could be a multi-level charging circuit with specific charging levels; the high-voltage energy storage capacitor uses a large-capacity, high-voltage capacitor to maximize stored energy and discharge time constant; the charging voltage detection circuit is used to detect the voltage across the high-voltage energy storage capacitor in real time, quantize it digitally, and feed it back to the fuse-based main control module 2a for software charging control, while simultaneously transmitting it back to the wireless remote control unit 1; the discharge control circuit consists of a high-power MOSFET and its isolation drive circuit, a discharge interface circuit, and a bypass discharge circuit; the high-power MOSFET is connected in series in the main discharge circuit between the high-voltage energy storage capacitor output and the discharge interface, and a high-power freewheeling diode is connected in anti-parallel to the discharge interface, and the fuse-based main control module 2a is activated. The fuse control signal output by module 2a drives the MOS transistor to switch on and off via the isolation drive circuit to achieve high-power discharge of the fuse electrode circuit 3. The bypass discharge circuit consists of a manual button, a solid-state switch, and a discharge current-limiting resistor. Bypass discharge can be performed manually or via software control. During testing and maintenance of the device, the voltage across the high-voltage energy storage capacitor can be reduced to a safe voltage range by manually discharging the energy on the high-voltage energy storage capacitor. In terms of software control, the target voltage for single-level or multi-level charging can be set by software programming. The fuse control signal for switching the high-power MOS transistor on and off in the drive discharge control circuit adopts digital variable pulse width chopper. The control method is optimized by using pulse width schemes such as initial pulse width and subsequent pulse width to accelerate the heating of the resistance wire in the fuse electrode and limit the maximum thermal stress. In addition, it supports custom delay and custom discharge window duration, so as to perform custom delay variable pulse width chopper discharge control on the fuse electrode circuit 3 according to the needs of different wind tunnel test scenarios. While ensuring the effective discharge window width and discharge energy, it reduces the vaporization phenomenon of the resistance wire in the fuse electrode circuit 3 due to high thermal stress in the initial high voltage discharge stage of the high voltage energy storage capacitor, thereby improving the working life of the resistance wire in the fuse electrode circuit 3 and further improving the working reliability of the device of the present invention. The synchronous trigger signal output module 2e consists of a drive buffer circuit and an independently programmable delay and programmable polarity configuration software control strategy. It is used to independently delay and output single or multiple synchronous trigger signals to other working devices after receiving trigger control commands from other devices transmitted via radio frequency wireless communication or infrared remote control release commands. The drive buffer circuit converts the trigger signal output by the fuse control unit 2's fuse main control module 2a into a digital control trigger signal required for external device operation. This includes necessary isolation circuits, level conversion circuits, drive buffer circuits, or combinations thereof for different scenarios. When an isolated synchronous trigger output signal is required in the application, the synchronous trigger signal output module 2e must include an isolation circuit. When the target control device requires an input trigger signal... When the logic level of the signal being transmitted differs from that of the synchronous trigger signal directly output by the fuse control unit 2, the synchronous trigger signal output module 2e must include a level conversion circuit; when the target control device requires a large current driving capability for the input trigger signal, the synchronous trigger signal output module 2e must include a drive buffer circuit; when isolation, level conversion, and drive buffering are not required in the application, the synchronous trigger signal output module 2e does not require additional circuitry and only relies on the main control chip in the fuse main control module 2a to directly output the synchronous trigger signal; the independent delay and signal polarity configuration of each synchronous trigger signal output channel are set through the human-machine interaction module 1e of the wireless remote control unit 1 and transmitted to the fuse control unit 2 for execution via low-power radio frequency wireless communication; The human-computer interaction module 2f integrates buttons and display components, which are used to bypass discharge and monitor the working status of the fuse control unit 2 locally via buttons, and can also be used to browse and set the working parameters of the fuse control unit 2 locally; The power management module 2g consists of a voltage conversion circuit and a battery management circuit. It is responsible for converting the battery voltage into the voltage required for the operation of each module of the fuse control unit 2, and realizing battery power monitoring and charging protection control.

4. The enhanced wireless synchronous release device for multi-model wind tunnel testing as described in claim 1, characterized in that: The fusible electrode circuit 3 consists of one or more fusible electrodes, a buffer inductor, and wires connecting the fusible electrodes and the buffer inductor in series. The number of fusible electrodes depends on the actual model suspension requirements. The fusible electrodes adopt a separate combination structure of metal frame and insulator, with embedded resistance wires and their supports. They are installed at the suspension points inside the model, and the embedded resistance wires are in contact with the model suspension lines. They also serve as the connection between the suspension lines and the model, and as the suspension line fuse. All the resistance wires and buffer inductors in the fusible electrodes are connected in series in a circuit to the discharge output interface of the high-voltage energy storage discharge module 2d of the fusible control unit 2. The large current released by the fusible control unit 2 flows synchronously through the circuit. The buffer inductor, in conjunction with the high-power diode in anti-parallel connection on the discharge interface of the fusible control unit 2, provides current freewheeling, thereby continuously heating the resistance wires in the fusible electrodes, synchronously fusing the suspension lines at each suspension point on the model, and achieving synchronous model release.

5. The enhanced wireless synchronous release device for multi-model wind tunnel testing as described in claim 1, characterized in that: The remote monitoring unit 4 is a device that includes input and display functions as well as communication functions that match the wired communication module 5 in the wireless remote control unit 1. It is used to conduct remote two-way interactive communication with the wireless remote control unit 1 to realize the remote setting and status monitoring of the working parameters of the wireless remote control unit 1 and the fuse control unit 2. This provides a safe and reliable long-distance monitoring function for application scenarios, especially dangerous wind tunnel test scenarios, making it easier to detect and handle abnormal situations in a timely manner and reduce invalid test situations.

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