Missile hanging frame detection system

Abstract

The invention discloses a missile hanging frame detection system, and belongs to the technical field of aircraft detection. Comprising a measured piece, the measured piece is connected with a signal measuring unit, the signal measuring unit is connected with a control unit and a power supply unit, and the power supply unit is connected with an external power supply; when the signal measurement unit receives a tested signal sent by a tested piece, different acquisition and measurement strategies are executed according to the type of the tested signal, so that various signal tests of the missile hanging frame are completed. Through the test method, risks existing in resistance detection can be avoided, the accuracy of resistance reading is improved, tools such as an oscilloscope and a universal meter can be omitted, and detection of emission signals can be directly completed. The uncertainty caused by repeated operation of the maintenance personnel is reduced, and the working efficiency of the maintenance personnel is improved. In-situ detection of the ammunition hanging frame can be completed at a time, detection of specific parameters such as ammunition resistance of the ammunition hanging frame and pulse width, amplitude and period of emission signals of the ammunition hanging frame is completed, and a novel detection mode is provided.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft detection, and in particular to a bomb rack detection system. Background Art

[0002] At present, the in-situ detection method of aircraft bomb racks is mainly to detect the resistance of the ammunition on the bomb racks and the transmission signal of the bomb racks. The maintenance personnel complete the ammunition resistance test through a pointer resistance meter by directly detecting the resistance. The maintenance personnel operate the cab to transmit the signal, and the ammunition resistance of the bomb racks is also checked by observing the equipment indicator light. If it is necessary to analyze the specific parameters of the transmission signal pulse width, amplitude, period, etc., the maintenance personnel need to operate the cab to transmit the signal again, and use tools such as oscilloscopes and multimeters to complete the inspection.

[0003] The above method has several disadvantages: a. Resistance detection is risky and there are no protective measures. Since measuring the resistance of ammunition on the ammunition rack requires controlling the current, excessive current can cause the ammunition to ignite.

[0004] b. Pointer type resistance meter has large reading error.

[0005] c. Resistance detection is risky and there are no protective measures. Since measuring the resistance of ammunition on the bomb rack requires controlling the current, excessive current can cause the ammunition to ignite.

[0006] d. It is not possible to effectively collect the launch signal of the bomb rack at one time to facilitate observation by the user; e. Increase the difficulty of detection operation and reduce the work efficiency of maintenance personnel; f. The test cannot be completed by one device alone, and tools such as oscilloscopes and multimeters are also needed. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a bomb rack detection system.

[0008] The objective of the present invention is achieved through the following technical solutions: a bomb rack detection system, comprising a device under test, the device under test is connected to a signal measuring unit, the signal measuring unit is connected to a control unit and a power supply unit, and the power supply unit is connected to an external power supply; when the signal measuring unit receives a test signal sent by the device under test, different acquisition and measurement strategies are executed according to the type of the test signal to complete various tests of the bomb rack.

[0009] Preferably, it further comprises a display unit, and the control unit is connected to the display unit via an RS485 interface circuit, and various test results are displayed on the display unit.

[0010] Preferably, the signal measurement unit comprises a relay matrix, a pulse acquisition circuit, a resistance measurement module, a voltage acquisition circuit, and a discrete quantity acquisition circuit; the input ends of the relay matrix, the voltage acquisition circuit, and the discrete quantity acquisition circuit are connected to the output ends of the measured device; the input end of the relay matrix is ​​connected to the control unit, and the output end of the relay matrix is ​​connected to the input end of the pulse acquisition circuit and the resistance measurement module; the output ends of the pulse acquisition circuit, the resistance measurement module, the voltage acquisition circuit, and the discrete quantity acquisition circuit are connected to the control unit; the measured signal comprises: a voltage signal, a resistance signal, a pulse signal, and a discrete quantity signal; When the measured signal received by the signal measurement unit is a voltage signal, the voltage signal is input into the voltage acquisition circuit. The voltage acquisition circuit divides the voltage signal through the operational amplifier and adds the operational amplifier follower, and inputs it into the AD acquisition I / O port of the control unit for voltage acquisition. The voltage is then filtered and output through the internal program software of the control unit. When the measured signal received by the signal measurement unit is a resistance signal, the resistance signal is input into the relay matrix, and then input into the resistance measurement module through the relay matrix. The Kelvin four-wire resistance measurement method is adopted, and the test cable adopts a shielded cable. The relay matrix is ​​used to scan multiple test channels and a fast-acting fuse is set on the test loop. Finally, the measurement result is input into the control unit; When the measured signal received by the signal measurement unit is a pulse signal, the pulse signal is input into the relay matrix, and then input into the pulse acquisition circuit through the relay matrix. The pulse acquisition circuit drives the relay matrix through the driver to switch channels, and connects the optocoupler isolation chip combined with the multi-channel hardware timer of the control unit to collect the pulse time width and period; When the measured signal received by the signal measurement unit is a discrete quantity signal, the discrete quantity signal is input into the discrete quantity acquisition circuit, and the discrete quantity signal is isolated and acquired. The discrete quantity signal is isolated by an optical coupler, shaped and filtered by an inverter, and finally sent to the control unit for acquisition.

[0011] Preferably, for the measurement of the resistance signal, a relay is set to connect the internal standard resistance. The internal standard resistance is measured before each measurement of the resistance value of the external resistance signal. The external resistance measurement is performed only when the internal standard resistance measurement is qualified, thereby realizing the self-check of the relay matrix.

[0012] Preferably, for the collection of discrete quantity signals, a relay is provided, a high level is added to one end of the relay, and when the relay is working, the high level of the discrete quantity signal is collected for self-checking.

[0013] Preferably, the power supply unit includes a fuse, an anti-reverse connection module, a main power switch, a power indicator light and a power conversion module; the input end of the fuse is connected to an external power supply, and the output end of the fuse is connected to the anti-reverse connection module; the output end of the anti-reverse connection module is connected to the main power switch and the power indicator light; the main power switch is connected to the power conversion module; and the output end of the power conversion module is connected to a signal measurement unit.

[0014] Preferably, the tested parts are bomb racks of various types, light training bomb racks and rocket launchers.

[0015] The beneficial effects of the present invention are: 1) This patented test method can avoid the risks in resistance detection, improve the accuracy of resistance readings, and eliminate the need for tools such as oscilloscopes and multimeters to directly complete the detection of transmission signals. It can reduce the uncertainty caused by repeated operations of maintenance personnel and improve their work efficiency.

[0016] 2) It can complete the in-situ detection of the bomb rack at one time, complete the detection of specific parameters such as the resistance of the ammunition on the bomb rack and the pulse width, amplitude, period and other specific parameters of the bomb rack launch signal, and provide a new detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a principle block diagram of a bomb rack detection system; Figure 2 It is a schematic diagram of the detection principle of the signal under test; Figure 3 Design schematic diagram for anti-reverse connection module; Figure 4 This is the schematic diagram of the +15VDC, -15VDC, +5VDC power conversion module; Figure 5 This is the schematic diagram of the +3.3VDC power conversion module; Figure 6 This is the circuit schematic diagram of the control unit; Figure 7 This is the schematic diagram of the RS485 interface circuit; Figure 8 This is the schematic diagram of the voltage follower circuit; Fig. 9 This is a physical picture of the resistance measurement module; Fig.10 It is the partial circuit schematic diagram of the relay matrix; Fig.11 This is the schematic diagram of the optocoupler circuit; Fig.12 This is the schematic diagram of the discrete signal acquisition circuit; Fig.13 This is a physical picture of the LCD screen of the display unit. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 13 The present invention provides a technical solution: a bomb rack detection system, including a device under test, the device under test is connected to a signal measuring unit, the signal measuring unit is connected to a control unit and a power supply unit, and the power supply unit is connected to an external power supply; when the signal measuring unit receives a test signal sent by the device under test, different acquisition and measurement strategies are executed according to the type of the test signal to complete various tests of the bomb rack.

[0020] In this embodiment, the equipment under test needs to detect 16 discrete signals, including emergency delivery, combat (normal) delivery, storm control, bomb release, presence signal, main DC, roll angle, bomb ready, aircraft altitude, training / rocket pulse and rocket launcher launch signal, of which 12 signals, including emergency delivery, combat (normal) delivery, storm control, presence signal and bomb release, are voltage signals; 7 signals, including emergency delivery, combat (normal) delivery and bomb release, are resistance and pulse signals. The discrete quantity signal detects the discrete quantity signal state by switching the indication channel, and judges the detection result according to the indication of the indicator light on the display screen; the 12-way 0V~30V voltage is input to the AD acquisition I / O port of the STM32 chip through the OP484FSZ chip after the voltage signal is divided and followed by the operational amplifier, and the voltage is collected using the chip's built-in 12-bit AD. The collected voltage value is displayed on the display screen; the four-wire resistance measurement is adopted, and the TRMD1002 series resistance measurement module is selected. The 7-way resistance measurement channel is switched through the relay, and a 10mA fast-break fuse is added to the measurement circuit to ensure that the current does not exceed 10mA when measuring the resistance. The measured resistance value is displayed on the display screen; on the basis of relay switching, the optocoupler isolation chip (LTV-244) is connected, and the multi-channel hardware timer built into the microprocessor can realize 7-way pulse collection with a width of 0ms~80ms, and the measured pulse width value is displayed on the display screen. The system principle block diagram is as follows Figure 1 shown.

[0021] In some embodiments, a display unit is also included. The control unit is connected to the display unit via an RS485 interface circuit, and various test results are displayed on the display unit.

[0022] In this embodiment, considering the working temperature and environment of the comprehensive detector, the display in the human-machine interface of the present invention uses Jinpeng's military-grade 5-inch serial port touch LCD screen OCM800480T500-3D, which is designed as a multi-page display to meet the display of voltage, resistance, pulse width and indicator light, and has a built-in touch function to complete channel selection and other functions. This serial port touch LCD screen (such as Fig.13 As shown), it adopts 32-bit RISC core control, built-in standard ASCⅡ, GBK, GB2312 and other fonts, and adopts register operation. When the value of the main register changes, all related controls will change accordingly. It adopts serial port control, with fewer lines, simple control and convenient operation. RS485 is used as the communication interface with the user's single-chip computer, and it can be conveniently and simply interfaced with various MCUs; the most distinctive feature of this series of products is that users only need to write some simple instructions to realize drawing and display functions, and there is no need to perform tedious calculations and operations in the user code. The functions and characteristics are as follows: 1. Resolution: 800×480; 2. Voltage (V): 5V~24V; 3. Interface mode: serial port UART / RS485; 4. Extended function: RTC; 5. Touch type: 4-wire precision resistance; 6. Power consumption (working current): backlight is brightest: 260mA / 5V; backlight is turned off: 180mA / 5V; 7. Full-screen display speed: 115ms.

[0023] The control unit realizes the control and management of the whole system, such as voltage acquisition, resistance acquisition, pulse width acquisition, discrete signal acquisition, output of display information and control of test logic. In order to ensure that the comprehensive detector has stable signal processing capabilities, the microcontroller uses a 32-bit high-performance ARM Cortex-M3 series MCU as the core controller, and its model is STM32F103RE. This controller has rich peripheral resources and stable and high-speed signal processing capabilities, which meets the requirements of the comprehensive detector to realize high-speed, multi-channel signal acquisition and output. The control unit is as follows Figure 6 shown.

[0024] The communication between the control unit and the resistance detection unit adopts the RS485 communication interface. The RS485 communication interface chip adopts ADM2483. The maximum communication rate of this chip is 500kbps, which allows up to 256 transceivers to be installed on the bus. It has an isolation circuit. The principle of RS485 communication circuit Figure 7 shown.

[0025] In some embodiments, the signal measurement unit includes a relay matrix, a pulse acquisition circuit, a resistance measurement module, a voltage acquisition circuit, and a discrete quantity acquisition circuit; the input ends of the relay matrix, the voltage acquisition circuit, and the discrete quantity acquisition circuit are connected to the output ends of the measured device; the input end of the relay matrix is ​​connected to the control unit, and the output end of the relay matrix is ​​connected to the input end of the pulse acquisition circuit and the resistance measurement module; the output ends of the pulse acquisition circuit, the resistance measurement module, the voltage acquisition circuit, and the discrete quantity acquisition circuit are connected to the control unit; the measured signal includes: a voltage signal, a resistance signal, a pulse signal, and a discrete quantity signal; When the measured signal received by the signal measurement unit is a voltage signal, the voltage signal is input into the voltage acquisition circuit. The voltage acquisition circuit divides the voltage signal through the operational amplifier and adds the operational amplifier follower, and inputs it into the AD acquisition I / O port of the control unit for voltage acquisition. The voltage is then filtered and output through the internal program software of the control unit. When the measured signal received by the signal measurement unit is a resistance signal, the resistance signal is input into the relay matrix, and then input into the resistance measurement module through the relay matrix. The Kelvin four-wire resistance measurement method is adopted, and the test cable adopts a shielded cable. The relay matrix is ​​used to scan multiple test channels and a fast-acting fuse is set on the test loop. Finally, the measurement result is input into the control unit; When the measured signal received by the signal measurement unit is a pulse signal, the pulse signal is input into the relay matrix, and then input into the pulse acquisition circuit through the relay matrix. The pulse acquisition circuit drives the relay matrix through the driver to switch channels, and connects the optocoupler isolation chip combined with the multi-channel hardware timer of the control unit to collect the pulse time width and period; When the measured signal received by the signal measurement unit is a discrete quantity signal, the discrete quantity signal is input into the discrete quantity acquisition circuit, and the discrete quantity signal is isolated and acquired. The discrete quantity signal is isolated by an optical coupler, shaped and filtered by an inverter, and finally sent to the control unit for acquisition.

[0026] In this embodiment, the signal measurement unit mainly collects 12 voltage signals, 7 resistance signals, 7 pulse width and period signals, and 16 discrete quantity signals. The measured signals are the bomb rack release signal, the riot control signal, the bomb release signal, the presence signal, the main DC signal, the roll angle signal, the bomb ready signal, the aircraft altitude signal, the training / rocket pulse signal, and the rocket launcher launch signal, and the measured voltage, resistance, and pulse width signals are displayed on the display screen.

[0027] For voltage collection, it mainly collects 12 channels of 0VDC~30VDC, accuracy: ±2%, such as emergency delivery, combat (normal) delivery, riot control, bomb release, and rocket launcher pipeline transmission signals. The acquisition circuit uses the OP484FSZ chip to divide the voltage signal and then add an op amp to follow (the principle of the voltage divider follower circuit is as follows Figure 8 As shown in the figure), the voltage is input to the AD acquisition I / O port of the STM32 chip, and the 12-bit AD built into the chip is used for voltage acquisition. After acquisition, it is filtered by the internal program software of the MCU. The collected voltage is output for display.

[0028] For the measurement of resistance, it is mainly to measure the resistance values ​​of 7 channels ranging from 0Ω to 10Ω, with an accuracy of ±0.1Ω, such as emergency delivery, combat (normal) delivery, riot control, bomb release, and each pipeline transmission signal of the rocket launcher, and the current value when measuring resistance is ≤10mA. Resistance measurement is mainly composed of resistance measurement module and relay matrix. The resistance module uses TRMD1002 series resistance measurement module. The module measures current ≤10mA, the measurement range is 0Ω to 15Ω, and the accuracy is ±0.1Ω. It can meet the measurement reading of up to 100 times / second, and is suitable for multi-point rapid scanning test. It adopts RS485 serial communication interface and MODBUS-RTU communication protocol. The actual picture is as follows Fig. 9 As shown. In order to improve the measurement accuracy and eliminate the errors introduced by relays, test cables and connectors, the Kelvin four-wire resistance measurement method is adopted, and the test cable is a shielded cable. A relay matrix is ​​used to scan the 7 channels. The relay uses the HFD4 / 5 signal relay. The relay is double-pole double-throw, the contact rated current is 2A, and the coil working voltage is 5VDC. A ULN2803 Darlington transistor driver can drive 8 relays separately. A total of 7 relays are designed for channel switching. At the same time, a 10mA fast-blow fuse is added to the measurement circuit to ensure that the current does not exceed 10mA when measuring resistance. This design fully meets the requirements of the comprehensive detector to measure and digitally display 0Ω~10Ω with an accuracy of ±0.1Ω. The principles of 3 circuits are as follows Fig.10 shown.

[0029] For the acquisition of pulse width and period, the main purpose is to collect emergency delivery, combat (normal) delivery, riot control, bomb throwing and rocket launcher pipeline emission signals, etc. 7 channels: 0ms~80ms, accuracy: ±2ms pulse time width and period. The acquisition circuit drives 7 relays through the ULN2803 Darlington transistor driver to switch channels and connect the optocoupler isolation chip (LTV-244). The chip has a response speed of ns level. Combined with the multi-channel hardware timer of the microprocessor, it can realize 7 channels with a width of 0ms~80ms and an accuracy of ±2ms. The pulse time width and period acquisition. The principles of 3 of the circuits are as follows Fig.11 shown.

[0030] The discrete signal acquisition is to isolate and collect 16 discrete signals outputted from emergency delivery, combat (normal) delivery, riot control, bomb release, presence signal, main DC, roll angle, bomb ready, aircraft altitude, training / rocket pulse and rocket launcher launch signal. The discrete signals are isolated by LTV-244 optocoupler, shaped and filtered by 74HC14 Schmidt trigger inverter, and finally sent to the microcontroller I / O for acquisition. It meets the needs of 16 discrete signal acquisition. The circuit principles of two of them are as follows: Fig.12 shown.

[0031] In some embodiments, for the measurement of resistance signals, a relay is set to connect the internal standard resistor. The internal standard resistor is measured before measuring the resistance value of the external resistance signal each time. The external resistance measurement is performed only when the internal standard resistance measurement is qualified, thereby realizing self-check of the relay matrix.

[0032] In this embodiment, when the device is in use, in order to ensure that the internal relay can work normally, an additional relay is added, which is the internal standard resistor. The internal standard resistor is measured before each external resistance measurement. When the internal standard resistance measurement is qualified, the external resistance measurement is performed, so as to achieve the function of self-test of the internal 7-way relay. When using the self-test function, the metering cable needs to be connected.

[0033] In some embodiments, for the collection of discrete quantity signals, a relay is provided, a high level is added to one end of the relay, and when the relay is working, the high level of the discrete quantity signal is collected for self-checking.

[0034] In this embodiment, a self-check function is designed for 16 discrete signals, and a relay is added, and one end is at a high level. When the relay is activated, the high level of the 16 discrete signals will be collected. When using the self-check function, a metering cable needs to be connected.

[0035] In some embodiments, the power supply unit includes a fuse, an anti-reverse connection module, a main power switch, a power indicator light and a power conversion module; the input end of the fuse is connected to an external power supply, and the output end of the fuse is connected to the anti-reverse connection module; the output end of the anti-reverse connection module is connected to the main power switch and the power indicator light; the main power switch is connected to the power conversion module; and the output end of the power conversion module is connected to a signal measurement unit.

[0036] In this embodiment, the power supply unit mainly realizes the unified management of the power supply of the system. During the design process, the use environment, frequency of use and safety factors of the product are taken into consideration. Combined with the actual situation in the workplace and based on the principle of convenient operation and use, the power supply unit uses a DC 27×(1±10%)V voltage as the working power supply. The device outputs the required +15V, -15V, +5V, and +3.3V through a DC-DC power adapter. For the power supply protection design, a 2A fuse is designed at the input end of the power supply to achieve overcurrent protection; the DC power supply input end implements a reverse protection design through a single-phase conduction diode (such as Figure 3 As shown), to ensure circuit safety.

[0037] For +15VDC, -15VDC, +5VDC power supplies, standard voltage regulator modules are used for voltage conversion. By inputting a wide range of 22V to 32VDC power, the output power is continuous, stable, and reliable after voltage conversion and filtering, which fully meets the design requirements. Figure 4 As shown. For +3.3VDC DC power supply, AMS1117 power chip is used to convert +5VDC power supply into +3.3VDC. Its schematic diagram is as follows Figure 5 shown.

[0038] In some embodiments, the tested parts are bomb racks of various types, light training bomb racks and rocket launchers.

[0039] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A bomb rack detection system, characterized in that: It includes a device under test, which is connected to a signal measuring unit, which is connected to a control unit and a power supply unit, and which is connected to an external power supply. When the signal measuring unit receives a test signal sent by the device under test, different acquisition and measurement strategies are executed according to the type of the test signal to complete various tests of the bomb rack.

2. The bomb rack detection system according to claim 1, characterized in that: It also includes a display unit. The control unit is connected to the display unit via an RS485 interface circuit, and various test results are displayed on the display unit.

3. The bomb rack detection system according to claim 1, characterized in that: The signal measurement unit comprises a relay matrix, a pulse acquisition circuit, a resistance measurement module, a voltage acquisition circuit, and a discrete quantity acquisition circuit; the input ends of the relay matrix, the voltage acquisition circuit, and the discrete quantity acquisition circuit are connected to the output ends of the measured device; the input end of the relay matrix is ​​connected to the control unit, and the output end of the relay matrix is ​​connected to the input ends of the pulse acquisition circuit and the resistance measurement module; The output ends of the pulse acquisition circuit, the resistance measurement module, the voltage acquisition circuit and the discrete quantity acquisition circuit are connected to the control unit; the measured signals include: voltage signals, resistance signals, pulse signals and discrete quantity signals; When the measured signal received by the signal measurement unit is a voltage signal, the voltage signal is input into the voltage acquisition circuit. The voltage acquisition circuit divides the voltage signal through the operational amplifier and adds the operational amplifier follower, and inputs it into the AD acquisition I / O port of the control unit for voltage acquisition. The voltage is then filtered and output through the internal program software of the control unit. When the measured signal received by the signal measurement unit is a resistance signal, the resistance signal is input into the relay matrix, and then input into the resistance measurement module through the relay matrix. The Kelvin four-wire resistance measurement method is adopted, and the test cable adopts a shielded cable. The relay matrix is ​​used to scan multiple test channels and a fast-acting fuse is set on the test loop. Finally, the measurement result is input into the control unit; When the measured signal received by the signal measurement unit is a pulse signal, the pulse signal is input into the relay matrix, and then input into the pulse acquisition circuit through the relay matrix. The pulse acquisition circuit drives the relay matrix through the driver to switch channels, and connects the optocoupler isolation chip combined with the multi-channel hardware timer of the control unit to collect the pulse time width and period; When the measured signal received by the signal measurement unit is a discrete quantity signal, the discrete quantity signal is input into the discrete quantity acquisition circuit, and the discrete quantity signal is isolated and acquired. The discrete quantity signal is isolated by an optical coupler, shaped and filtered by an inverter, and finally sent to the control unit for acquisition.

4. The bomb rack detection system according to claim 3 is characterized in that: For the measurement of resistance signals, a relay is set to connect the internal standard resistance. The internal standard resistance is measured before each measurement of the resistance value of the external resistance signal. The external resistance value is measured only when the internal standard resistance value measurement is qualified, thereby realizing the self-check of the relay matrix.

5. The bomb rack detection system according to claim 3 is characterized in that: For the collection of discrete quantity signals, a relay is set up, and a high level is added to one end of the relay. When the relay is working, the high level of the discrete quantity signal is collected for self-test.

6. The bomb rack detection system according to claim 1, characterized in that: The power supply unit comprises a fuse, an anti-reverse connection module, a main power switch, a power indicator light and a power conversion module; the input end of the fuse is connected to an external power supply, and the output end of the fuse is connected to the anti-reverse connection module; the output end of the anti-reverse connection module is connected to the main power switch and the power indicator light; the main power switch is connected to the power conversion module; and the output end of the power conversion module is connected to a signal measurement unit.

7. The bomb rack detection system according to any one of claims 1 to 6, characterized in that: The tested parts are bomb racks of various types, light training bomb racks and rocket launchers.

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