Aircraft tachometer comprehensive test device

Abstract

The utility model discloses a comprehensive testing device for an airplane tachometer. The comprehensive testing device comprises a host, a driving device, a rotating speed indicator and a rotating speed sensor, a communication module is arranged in the host; the host and the driving device carry out RS-232 communication through the communication module; the host is in RS-422 communication with the rotating speed indicator and the rotating speed sensor through the communication module; the driving device is provided with a linkage shaft, and the driving device is connected with the rotating speed sensor through the linkage shaft. According to the utility model, the DDS principle is adopted to output rotating speed signals, the precision is high, and the readability is good; and the servo motor with high rotating speed precision and the controller are adopted, so that the output rotating speed signal is stable and reliable. A DDS rotating speed circuit in the detection control module mainly adopts a DDS technology to generate sine wave signals of any frequency, the DDS rotating speed circuit is mainly composed of an AD9833, the DDS rotating speed circuit generates three paths of sine wave signals, the sine wave signals are amplified by a post-stage amplification circuit and output to a tachometer indicator, and the circuit simulates rotating speed signals of a rotating speed sensor.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of military aircraft test equipment, specifically to a kind of aircraft tachometer comprehensive test device. BACKGROUND

[0002] Aircraft engine tachometer is important airborne equipment of aircraft. Aircraft engine tachometer needs to be overhauled regularly to ensure its accuracy and reliability, so as to ensure flight safety. Aircraft engine tachometer is an important tool for pilots to monitor engine operating conditions, which can provide key information about engine performance. By detecting aircraft engine tachometer, it can ensure that it accurately reflects the speed of the engine under various flight conditions, so as to help pilots adjust the flight state in time and ensure flight safety. Aircraft engine tachometer is a key device for pilots to monitor engine performance, and its accuracy is directly related to the safety of flight. On the one hand, the aircraft not only requires the tachometer to maintain high reliability in harsh environmental conditions such as high temperature, but also requires it to adapt to strong vibration, impact and large overload, and at the same time, it requires it to maintain stable performance under long-term use conditions.

[0003] There are a lot of interference sources in the equipment work site, such as the interference of high-power electrical equipment to the power supply, the interference of high-order harmonic generated by the pulse width modulation technology and high-power switching tube used in frequency converter, etc. These interferences entering the front channel of the system may cause the components on the inspection circuit board to work unstably, which will distort the analog signal and cause the digital signal to be wrong, especially when the signal source is a small voltage, the signal interference is more serious, and the test accuracy must be reduced. There is no comprehensive calibration device for tachometer sensor and indicator. They are tested together by the device, or they need to be tested by standard parts. The sensor and the indicator cannot be tested separately, and the AC phase voltage performance of the sensor output of the tachometer cannot be tested. SUMMARY

[0004] The utility model aims at overcoming the insufficient of prior art, provide a kind of aircraft tachometer comprehensive test device.

[0005] The utility model aims at overcoming the insufficient of prior art, provide a kind of aircraft tachometer comprehensive test device.

[0006] The utility model provides a kind of aircraft tachometer comprehensive test device, including host computer, driving device, speed indicator and speed sensor, communication module is arranged in the host computer, the host computer is communicated with driving device by the communication module and carries out RS-232, the host computer is communicated with speed indicator, speed sensor by the communication module and carries out RS-422, driving device is provided with linkage shaft, and driving device is connected with speed sensor by linkage shaft.

[0007] Further, a power supply unit is arranged in the host computer, for supplying power to the host computer, the driving device and the measured object, and a 3A fuse is arranged in the power supply unit, for preventing large current impact.

[0008] Further, a detection control module is arranged in the host computer, and the detection control module comprises a data processor, a DDS rotation speed circuit and a three-phase voltage measurement circuit, and the data processor adopts an STM32 microprocessor.

[0009] The DDS rotation speed circuit comprises an AD9833, generates three-way sinusoidal wave signals, and outputs the signals to a rotation speed indicator through a post-stage amplification circuit; the STM32 microprocessor generates rotation speed signals by controlling the digital clock input and the serial clock input of the AD9833, and then outputs the signals to the rotation speed indicator through an amplification circuit.

[0010] The three-phase voltage measurement circuit comprises a voltage sensor WBV411D07 and an ADS1115; after an alternating current voltage signal passes through the voltage sensor WBV411D07, the signal is collected by the ADS1115 and is output by the STM32 chip.

[0011] Preferably, a liquid crystal screen is arranged in the host computer, a serial port is arranged on the liquid crystal screen, the liquid crystal screen is connected with the STM32 microprocessor through the serial port, the STM32 microprocessor interacts with the DDS rotation speed circuit and the three-phase voltage, uploads data to the liquid crystal screen for display, inputs data through the liquid crystal screen, and the STM32 microprocessor downloads the data to the data processor for processing.

[0012] Further, the driving device is provided with a servo driving simulator, a rotation speed control module, a rotation speed display module and a direct current servo motor, the servo driving simulator is connected with the rotation speed control module, the rotation speed display module and the direct current servo motor respectively; the servo driving simulator controls the direct current servo motor, collects real-time rotation speed from a rotation speed encoder on the direct current servo motor, and the test device further comprises a sensor and an indicator, provides an analog working environment for the sensor and the indicator, measures output signals, and tests the performance of the sensor and the indicator by comparing parameters, and can also test the performance of the indicator alone.

[0013] 1) The utility model adopts mature technology, and the performance is reliable; the rotation speed signal is output by adopting the DDS principle, and the precision is high and the readability is good; the high rotation speed precision servo motor and the controller are adopted, and the output rotation speed signal is stable and reliable.

[0014] 2) The power supply unit of the utility model further relates to a 2A fuse, for preventing large current impact.

[0015] 3) The DDS rotation speed circuit in the detection control module mainly generates sinusoidal wave signals of arbitrary frequency by using DDS technology, mainly consists of AD9833, generates 3-way sinusoidal wave signals, and outputs to a rotation speed indicator through a post-stage amplification circuit, and the circuit realizes the rotation speed signal of an analog rotation speed sensor.

[0016] 4) The microprocessor generates rotation speed signals by controlling the digital clock input and serial clock input of AD9833, outputs to a rotation speed indicator through an amplification circuit, and through the interaction data between the microprocessor and the DDS rotation speed circuit and three-phase voltage, the data input through a touch liquid crystal screen is also transmitted to a data processor for processing. The liquid crystal screen is directly connected with the STM32 through a serial port, and the server is connected with the STM32 through RS323.

[0017] 5) The three-phase voltage measurement circuit can complete the measurement of three-phase voltage, mainly consists of a voltage sensor WBV411D07 and ADS1115. After the AC voltage signal is collected by ADS1115 through the WBV411D07 voltage sensor, it is controlled and output by the STM32 chip. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the airplane rotation speed indicator comprehensive test device of the embodiment of the utility model;

[0019] Figure 2 It is a power supply unit schematic view of the airplane rotation speed indicator comprehensive test device of the embodiment of the utility model;

[0020] Figure 3 It is a liquid crystal screen display schematic view of the airplane rotation speed indicator comprehensive test device of the embodiment of the utility model;

[0021] Figure 4 It is a DDS rotation speed circuit schematic view of the airplane rotation speed indicator comprehensive test device of the embodiment of the utility model;

[0022] Figure 5 It is a three-phase voltage acquisition circuit schematic view of the airplane rotation speed indicator comprehensive test device of the embodiment of the utility model. DETAILED DESCRIPTION

[0023] The technical solutions of the utility model will be described clearly and completely in combination with embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0024] This utility model provides a comprehensive testing device for aircraft tachometers, the structural schematic diagram of which is shown below. Figure 1 As shown, the device includes a main unit, a drive unit, a speed indicator, and a speed sensor. The main unit is equipped with a communication module. The main unit and the drive unit communicate via RS-232 through this module; the main unit communicates with the speed indicator and speed sensor via RS-422 through the same module. The drive unit has a linkage shaft, connecting it to the speed sensor. The test device's panel features a power indicator light, a power switch, a motor control switch, switches for combined and single-sided testing of the sensor and indicator, a speed setting knob, an amplitude adjustment knob, and a phase-to-phase voltage test port for signal monitoring. The tachometer integrated tester is powered by 220VAC±10% / 50Hz±5% AC, which is converted to 24VDC±10% DC via an AC-DC switching power conversion module to power the system under test. The main unit uses a 5.0-inch touchscreen LCD, providing a more intuitive, simple, and bright interface through a human-machine interface. The core of the drive unit uses a servo DC motor and a servo drive simulator. The servo motor employs a position mode to improve its load-carrying capacity. The servo drive simulator uses a PID algorithm to control the motor and acquires real-time speed data from the motor's speed encoder, forming a closed-loop system for more accurate output speed. The test equipment provides a simulated working environment for sensors and indicators, measures the output signals, and performs performance tests on the sensors and indicators by comparing parameters. It can also perform performance tests on indicators independently.

[0025] Specifically, the main unit also includes a power module, which primarily supplies power to the main unit, drive unit, LCD screen, and test piece. During the design process, considerations were taken into account regarding the product's operating environment, frequency of use, safety factors, and high accuracy requirements. Based on the actual workplace conditions and prioritizing ease of operation and use, a 220V / 50Hz industrial frequency power supply was adopted. The system internally requires 24VDC, 3.3VDC, ±15VDC, and +12V power supplies. The ±15VDC and 24VDC power supplies are derived from the 220VAC power supply via a switching power supply. The switching power supply uses Mean Well's NES-300-24 (300W) and RID-125-1515 (125W) switching power supplies, outputting 24V and ±15V DC voltages to power the drive unit, test piece, and other components via a DC-DC power module. Therefore, the tester's operating current is 1.4A (300W / 220V), and its rated power is 300W. The 3.3V and +12V are converted from 24V via the SY8303AIC. The power supply unit also includes a 2A fuse to protect against high current surges. A schematic diagram of the power supply unit is shown below. Figure 2 As shown.

[0026] Specifically, the host computer also includes a detection and control module; the detection and control module includes a data processor, a DDS speed circuit, and a three-phase voltage measurement circuit, wherein the data processor is an STM32 microprocessor; a schematic diagram of the DDS speed circuit is shown below. Figure 4 As shown in the diagram, the three-phase voltage acquisition circuit is as follows: Figure 5 As shown, the DDS speed circuit includes an AD9833. The DDS speed circuit generates three sinusoidal signals, which are amplified by a subsequent amplifier circuit and output to the speed indicator. This circuit simulates the speed signal from a speed sensor. The DDS speed circuit simulates a speed range of 150 r / min to 6000 r / min with an accuracy of ±5 r / min. The STM32 microprocessor generates the speed signal by controlling the digital clock input and serial clock input of the AD9833, and then outputs it to the speed indicator through an amplifier circuit. The three-phase voltage measurement circuit includes a voltage sensor WBV411D07 and an ADS1115. The AC voltage signal passes through the voltage sensor WBV411D07, is acquired by the ADS1115, and is output under the control of the STM32 chip. The sensor's technical specifications are as follows: Linear range: 0%~120% of nominal input; Frequency response: 25Hz~5kHz; Response time: 15μs; Input impedance: Ri=Ux×1kΩ / V (Ux represents the measured input voltage); Overload capacity: 2 times the nominal input voltage value, for 1 second, with a 10-second interval, repeated 10 times; Load capacity: 5mA; Input range: AC10V, 50V, 100V, 250V and 300V; Output specifications: AC0~3.5V, 0~5V; DC 0~5V;

[0027] Specifically, the host computer is also equipped with an LCD screen, which has a serial port. The LCD screen is connected to the STM32 microprocessor via the serial port. The STM32 microprocessor interacts with the DDS speed circuit and the three-phase voltage, uploading data to the LCD screen for display. By controlling the LCD screen to input data, the STM32 microprocessor downloads the data to the data processor for processing. The LCD screen supports 16-bit true color RGB display (65,536 colors), supports a maximum resolution of 800*600, and has built-in standard ASIC font libraries of 8*12, 8*16, 12*24, and 16*32, GBK font libraries of 12*12, 16*16, and 24*24, and GB2312 font libraries of 32*32. It supports cursor display; image download supports JPG, BMP, JPEG, WMF, PNG, and GIF formats; it supports image display at any position, image cropping, and regional image updates, with a baud rate range of 1200-115200bp. The human-computer interaction interface provides a more intuitive, simple, and bright interface.

[0028] Specifically, the drive device includes a servo drive simulator, a speed control module, a speed display module, and a DC servo motor. The servo drive simulator is connected to the speed control module, the speed display module, and the DC servo motor. The servo drive simulator controls the DC servo motor, acquiring real-time speed data from the speed encoder on the DC servo motor, thus forming a closed-loop system for more accurate output speed. The DC servo motor uses a position mode to improve its load-carrying capacity. The test device also includes sensors and indicators, providing a simulated working environment for them and measuring the output signals. Performance testing of the sensors and indicators is completed through parameter comparison, and the performance of the indicators can also be tested independently. The DC servo motor model is 60BL02A-MB; rated power is 200W; rated torque is 0.32Nm; rated speed is 6000r / min; rated voltage is 24V; rated current is 9A; the servo drive simulator model is MCD4830(E).

[0029] This utility model is mainly used to test the working performance of engine tachometer indicators and sensors. The functional requirements are as follows: Performing permissible error checks on the tachometer indicator; performing balance checks on the tachometer indicator; performing hysteresis error checks on the tachometer indicator; performing speed signal simulation; and performing phase-to-phase voltage checks on the speed sensor. Specific parameters are as follows: Speed ​​signal simulation: 150 r / min, 1000 r / min, 2000 r / min, 3000 r / min, 4000 r / min, 5000 r / min, 6000 r / min. Phase-to-phase voltage detection: (15~17) V.

[0030] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A comprehensive testing device for aircraft tachometers, characterized in that: It includes a main unit, a drive unit, a speed indicator, and a speed sensor; the main unit is equipped with a communication module; the main unit and the drive unit communicate via RS-232 through the communication module; the main unit communicates with the speed indicator and the speed sensor via RS-422 through the communication module; the drive unit is equipped with a linkage shaft, and the drive unit and the speed sensor are connected via the linkage shaft; The host computer is also equipped with a detection and control module; the detection and control module includes a data processor, a DDS speed circuit and a three-phase voltage measurement circuit, and the data processor adopts an STM32 microprocessor; The DDS speed circuit includes an AD9833, which generates three sine wave signals, which are amplified by a subsequent amplifier circuit and output to the speed indicator. The STM32 microprocessor generates speed signals by controlling the digital clock input and serial clock input of the AD9833, and then outputs them to the speed indicator through an amplifier circuit. The three-phase voltage measurement circuit includes voltage sensors WBV411D07 and ADS1115; the AC voltage signal passes through voltage sensor WBV411D07 and is acquired by ADS1115, and the output is controlled by STM32 chip.

2. The comprehensive testing device for aircraft tachometers according to claim 1, characterized in that: The host is also equipped with a power supply unit for powering the host, drive device and the device under test. The power supply unit is equipped with a 3A fuse to prevent high current surges.

3. The comprehensive testing device for aircraft tachometers according to claim 1, characterized in that: The host computer is also equipped with an LCD screen, which has a serial port. The LCD screen is connected to the STM32 microprocessor through the serial port. The STM32 microprocessor interacts with the DDS speed circuit and the three-phase voltage, uploading data to the LCD screen for display. Data is input through the LCD screen, and the STM32 microprocessor downloads the data to the data processor for processing.

4. The comprehensive testing device for aircraft tachometers according to claim 1, characterized in that: The drive device includes a servo drive simulator, a speed control module, a speed display module, and a DC servo motor. The servo drive simulator is connected to the speed control module, the speed display module, and the DC servo motor. The servo drive simulator controls the DC servo motor and acquires real-time speed data from the speed encoder on the DC servo motor. The test device also includes sensors and indicators. The test device provides a simulated working environment for the sensors and indicators and measures the output signals. The performance of the sensors and indicators is tested by comparing parameters, and the performance of the indicators can also be tested separately.

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