Simulation experiment device for attack angle sensor test

Abstract

The invention relates to the technical field of sensor detection, and relates to a simulation experiment device for attack angle sensor testing, and the device comprises a control panel which transmits a control signal to a motor according to the position of a self-detection knob; the attack angle sensor comprises a weather vane, a sun gear of the weather vane and a shell assembly, and the sun gear of the weather vane is connected with the attack angle setting knob through a first gear assembly; the transmission mechanism comprises a clutch unit and a motor, and the motor is connected with the first gear through the clutch unit so as to provide power for the central gear; the shell heating device is used for heating the shell of the attack angle sensor; the thermocouple transmits a third electric signal to the logical judgment circuit; and the logic judgment circuit obtains a set angle according to the first electric signal, obtains a self-checking angle according to the second electric signal and calculates a temperature value according to the third electric signal. Whether the attack angle sensor breaks down or not is judged according to the difference between the collected data of the attack angle sensor and the actual value in a laboratory environment.

Description

Technical Field

[0001] The present invention generally relates to the field of sensor detection technology, and more specifically, to a simulation experimental device for angle of attack sensor testing. Background Art

[0002] The angle of attack sensor is a key sensor on an aircraft. It is mainly used to measure the angle of attack of the aircraft relative to the flight direction and convert it into an electrical signal proportional to the angle. The angle of attack refers to the angle of the aircraft's wing relative to the relative airflow, which is crucial to flight performance, stability and safety. The angle of attack sensor is usually measured by capacitance, optics or mechanical means. In the atmospheric data computer, the output signal of the angle of attack sensor will be compensated to eliminate the influence of factors such as sensor error and temperature change, and finally obtain a true angle of attack value. The true angle of attack signal is used for static pressure source error correction to ensure that the flight control system can perform flight control based on accurate data. The true angle of attack signal can also be transmitted to multiple flight systems, such as the flight instrument display system, the stall warning system and the flight performance monitoring system. When the actual angle of attack of the aircraft approaches the critical angle of attack (that is, the critical angle at which the aircraft is about to stall), the stall warning system will trigger and send various forms of warning signals (such as sound alarms, visual warnings or vibration feedback, etc.) to remind the pilot to take measures to avoid entering a stall state, thereby ensuring flight safety.

[0003] In order to ensure the high accuracy and reliability of the sensor, modern aircraft angle of attack sensors are usually equipped with a self-calibration function, which can automatically adjust the measurement deviation according to the working environment and status of the aircraft, further improving the data accuracy. At the same time, the angle of attack sensor can also work closely with the flight control system and flight data recording system to provide pilots with real-time flight attitude data and help monitor and optimize flight performance.

[0004] The high performance and stability of the angle of attack sensor are crucial in complex weather conditions and flight conditions, especially during high-altitude flight, low-speed flight or maneuvering operations. Ensuring the accuracy of the angle of attack data plays an indispensable role in avoiding flight accidents and improving the flight quality of the aircraft. In addition, high-angle-of-attack flight can achieve better low-speed maneuverability and better control stability, and can also ensure the nose pointing of the aircraft, making it easier to lock and anti-lock the aircraft, so modern fighters attach great importance to the ability to fly at high angles of attack. At present, the test of the aircraft angle of attack sensor is mainly carried out by the self-detection of the aircraft platform, and judgment is made by comparing the feedback data. This detection process is like a black box, which cannot directly display the detailed signal transformation and processing process of each part of the angle of attack sensor, which is not convenient for beginners to quickly grasp the working principle of the angle of attack sensor and understand the use and maintenance connotation of the angle of attack sensor. Summary of the invention

[0005] In order to solve the technical problem that the above-mentioned existing angle of attack sensor testing technology cannot directly display the transformation and processing process of the detailed signals of each part of the angle of attack sensor, the present invention provides a simulation experimental device for angle of attack sensor testing in the following multiple aspects, the device includes: a control panel, which includes an angle of attack setting knob and a self-detection knob, and the control panel sends a control signal to the motor 11 according to the position of the self-detection knob; an angle of attack sensor, which includes a weather vane 9 and its central gear 7, and a shell assembly, wherein the central gear 7 of the weather vane 9 is connected to the angle of attack setting knob through a first gear assembly, and the angle of attack setting knob is used to provide power to the central gear 7 through the first gear assembly, and the central gear 7 of the weather vane 9 provides power to the second gear assembly, and the second gear assembly provides power to the rotary transformer; a transmission mechanism, which includes a clutch unit and a motor 11, and the motor 11 is connected to the first gear through the clutch unit to provide power to the central gear 7; wherein, when the angle of attack setting knob is turned When the central gear 7 provides power and the motor 11 does not provide power to the central gear 7 through the clutch unit, the rotary transformer outputs a first electrical signal; when the angle of attack setting knob provides power to the central gear 7 and the motor 11 provides power to the central gear 7 through the clutch unit, the rotary transformer outputs a second electrical signal; a shell heating device, which is used to heat the shell of the angle of attack sensor; a thermocouple, which transmits a third electrical signal to the logic judgment circuit, and the thermocouple is arranged inside the shell of the heating angle of attack sensor; a logic judgment circuit, which receives the first electrical signal and obtains the setting angle according to the first electrical signal, the logic judgment circuit receives the second electrical signal and obtains the self-test angle according to the second electrical signal, and the logic judgment circuit calculates the temperature value according to the third electrical signal; when the temperature value is greater than or equal to the preset value, the logic judgment circuit determines whether the angle of attack sensor is faulty according to the absolute value of the difference between the self-test angle and the preset angle.

[0006] Preferably, the logic judgment unit includes: an A / D converter and a processor, wherein the voltage sampling A / D converter receives the third electrical signal output by the thermocouple and the first electrical signal and the second electrical signal output by the rotary transformer, the A / D converter converts the first electrical signal into a first digital signal, converts the second electrical signal into a second digital signal, converts the third electrical signal into a third digital signal, and inputs the first digital signal, the second digital signal, and the third electrical signal into the processor, the processor determines the setting angle according to the first digital signal, determines the self-test angle according to the second digital signal, calculates the temperature value according to the third digital signal, and determines that the angle of attack sensor is faulty when the temperature value is greater than a preset value and the absolute value of the difference between the self-test angle and the setting angle is greater than a preset threshold.

[0007] Preferably, the simulation experimental device for angle of attack sensor testing also includes a display, which is connected to the processor, and the display receives a signal output by the processor to display the set angle, the self-test angle, the temperature value and the result of whether the angle of attack device is faulty.

[0008] Preferably, the A / D converter is a TLC2543 chip, and the processor is an AT89C51 chip.

[0009] Preferably, the formula for the A / D converter to calculate the first digital signal according to the first electrical signal is: , where is a preset first reference voltage, is a preset second reference voltage, is the voltage value corresponding to the first electrical signal, is the binary value corresponding to the first digital signal.

[0010] Preferably, the formula for the A / D converter to calculate the second digital signal according to the second electrical signal is: , where is a preset first reference voltage, is a preset second reference voltage, is the voltage value corresponding to the second electrical signal, is the binary value corresponding to the second digital signal.

[0011] Preferably, the first reference voltage is +5V, and the second reference voltage is 0V.

[0012] Preferably, the temperature value and the voltage value corresponding to the third electrical signal satisfy the formula: ; Among them is The voltage value corresponding to the third electrical signal, T is the temperature value.

[0013] Preferably, the simulation experimental device for angle of attack sensor testing further includes a damper, which is connected to the central gear 7 .

[0014] The beneficial effects of the present invention are: The present invention interferes with the gear assembly of the wind vane 9 of the angle of attack sensor through a driving mechanism including a motor 11, so as to simulate the environmental interference of the angle of attack sensor when actually detecting an aircraft. Therefore, the present invention can collect the difference between the collected data of the angle of attack sensor and the actual value in real time under a laboratory environment, and then judge the accuracy of the data obtained by the angle of attack sensor automatically adjusting the measurement deviation, thus overcoming the technical problem that the existing aircraft angle of attack sensor testing technology cannot directly display the transformation and processing process of the detailed signals of each part of the angle of attack sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a structural block diagram of a simulation experimental device for angle of attack sensor testing according to an embodiment of the present invention; Figure 2 is a schematic diagram of a logic judgment circuit according to an embodiment of the present invention; Figure 3 is a structural diagram of a transmission mechanism according to an embodiment of the present invention; Figure 4 This is the working principle of the weather vane according to the embodiment of the present invention.

[0016] 1. Motor; 2. Reducer; 3. Friction clutch; 4. Driving gear; 5. Driven gear; 6. Electromagnetic clutch; 7. Center gear; 8. Weather vane 9 shaft; 9. Weather vane. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not 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.

[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] Figure 1 It is a structural block diagram of a simulation experimental device for angle of attack sensor testing according to an embodiment of the present invention.

[0020] like Figure 1 As shown, the simulation experimental device for angle of attack sensor testing includes: a control panel, an angle of attack sensor, a transmission mechanism, a shell heating device, a thermocouple, and a logic judgment circuit.

[0021] Wherein, the control panel includes an angle of attack setting knob and a self-detection knob, and the control panel sends a control signal to the motor 11 according to the position of the self-detection knob; the angle of attack sensor includes a wind vane 9 and its central gear 7, and a housing assembly, wherein the central gear 7 of the wind vane 9 is connected to the angle of attack setting knob through a first gear assembly, and the angle of attack setting knob is used to provide power to the central gear 7 through the first gear assembly, and the central gear 7 of the wind vane 9 provides power to the second gear assembly, and the second gear assembly provides power to the rotary transformer; the transmission mechanism includes a clutch unit and a motor 11, and the motor 11 is connected to the first gear through the clutch unit to provide power to the central gear 7; wherein, when the angle of attack setting knob provides power to the central gear 7, and the motor 11 does not provide power to the central gear 7 through the clutch unit, the rotary transformer The rotary transformer outputs a first electrical signal; when the angle of attack setting knob provides power to the central gear 7, and the motor 11 provides power to the central gear 7 through the clutch unit, the rotary transformer outputs a second electrical signal; a shell heating device, which is used to heat the shell of the angle of attack sensor; a thermocouple, which transmits a third electrical signal to the logic judgment circuit, and the thermocouple is arranged inside the shell of the heating angle of attack sensor; a logic judgment circuit, which receives the first electrical signal and obtains the setting angle according to the first electrical signal, the logic judgment circuit receives the second electrical signal and obtains the self-test angle according to the second electrical signal, and the logic judgment circuit calculates the temperature value according to the third electrical signal; when the temperature value is greater than or equal to the preset value, the logic judgment circuit determines whether the angle of attack sensor is faulty according to the absolute value of the difference between the self-test angle and the preset angle.

[0022] The wind vane is usually a freely rotatable device. Affected by the wind force, the wind vane 9 will adjust its angle as the wind direction changes, thereby measuring the angle of attack. Figure 4 As shown, Figure 3 The symmetry line of the wedge-shaped section of the wind vane is parallel to the airflow direction. When the aerodynamic forces acting on the upper and lower surfaces of the wind vane are equal, the torque on the shaft is zero and the wind vane stays in the equilibrium position (see Figure 4 If the aircraft axis changes relative to the direction of the airflow, the symmetry line of the wedge-shaped section of the weather vane will not be parallel to the direction of the airflow. At this time, the aerodynamic forces acting on the upper and lower surfaces of the weather vane are no longer equal, forming a torque that forces the weather vane to rotate around the axis until the symmetry line of its section becomes parallel to the direction of the airflow again (see Figure 4 b) in the above.

[0023] In one embodiment, the angle of attack is set by the angle setting button, the center gear 7 assembly is driven by the first gear assembly, and then the second gear assembly is driven to rotate, and the RVDT excitation coil of the rotary transformer is connected to 5V 1500HZ AC to generate a magnetic field. When the second gear assembly rotates, the output coil CT end outputs an electrical signal corresponding to the angle of attack. When the angle of attack sensor is in an actual working environment (for example, an angle of attack sensor running on a running aircraft), the center gear 7 is usually disturbed due to the high-speed flight or sharp turn of the aircraft. The present invention uses the force output by the transmission mechanism to the center gear 7 as the disturbance received by the angle of attack sensor in actual application, and then measures the accuracy of the angle of attack measured by the angle of attack sensor in the presence of disturbance.

[0024] The rotary transformer is a rotary variable differential transformer (RVDT), which is an angular displacement sensor. The rotary variable differential transformer adopts the same differential transformer principle as the LVDT, that is, the rotation of the mechanical component is transmitted to the shaft of the angular displacement sensor, driving the spoiler / core connected to it, changing the induced voltage / inductance in the coil, and outputting a voltage / current signal proportional to the rotation angle.

[0025] In one embodiment, under standard atmospheric conditions, the angle of attack sensor is placed in still air, and the housing heating assembly heats the angle of attack sensor to measure whether the measurement data of the angle of attack sensor at high temperature is accurate. The maximum temperature of the housing assembly is 100 degrees Celsius.

[0026] Furthermore, the simulation experimental device for angle of attack sensor testing also includes a damper, which is connected to the central gear 7. The damper applies a damping torque to the rotating component (central gear 7) through gear transmission to reduce the vibration of the angle of attack sensor wind vane 9 and stabilize the output of the angle of attack sensor.

[0027] Figure 2 is a schematic diagram of a logic judgment circuit according to an embodiment of the present invention.

[0028] like Figure 2As shown, the logic judgment unit includes: an A / D converter and a processor, wherein the voltage sampling A / D converter receives the third electrical signal output by the thermocouple and the first electrical signal and the second electrical signal output by the rotary transformer, the A / D converter converts the first electrical signal into a first digital signal, converts the second electrical signal into a second digital signal, converts the third electrical signal into a third digital signal, and inputs the first digital signal, the second digital signal, and the third electrical signal into the processor, the processor determines the setting angle according to the first digital signal, determines the self-test angle according to the second digital signal, calculates the temperature value according to the third digital signal, and determines that the angle of attack sensor is faulty when the temperature value is greater than a preset value and the absolute value of the difference between the self-test angle and the setting angle is greater than a preset threshold.

[0029] Wherein, when the temperature value is greater than a preset value and the absolute value of the difference between the self-test angle and the set angle is less than or equal to a preset threshold, it is determined that the angle of attack sensor is faulty. In one embodiment, the preset threshold is 1°.

[0030] In one embodiment, the A / D converter is a TLC2543 chip, and the processor is an AT89C51 chip. Among them, TLC2543 is a 12-bit analog-to-digital converter with 11 input terminals, which uses switched capacitor approximation technology to complete the A / D conversion process. Since TLC2543 is a Sichuan Airlines input, it can save the I / O resources of the 51 series microcontroller, so TLC2543 is widely used in instrumentation. AT89C51 is a low-voltage, high-performance CMOS 8-bit microprocessor with 4K bytes of FLASH memory (FPEROM-FlashProgrammable and Erasable Read Only Memory).

[0031] Furthermore, the logic judgment unit also includes a relay and a third capacitor C3, one end of the relay, one end of the third capacitor C3, and the EA pin of TLC2543 (A / D converter) are all connected to a high level, and the other end of the relay, the other end of the third capacitor C3, and the RST pin of TLC2543 (A / D converter) are all grounded through the first resistor R1. Based on this, by controlling the on and off of the relay, the level connected to the RST pin can be controlled, and then a valid signal that meets the reset requirements is generated on the RST pin.

[0032] In one embodiment, the formula for the A / D converter to calculate the first digital signal according to the first electrical signal is: , where is a preset first reference voltage, is a preset second reference voltage, is the voltage value corresponding to the first electrical signal, is the binary value corresponding to the first digital signal. In one embodiment, the formula for calculating the second digital signal by the A / D converter according to the second electrical signal is: , where is a preset first reference voltage, is a preset second reference voltage, is the voltage value corresponding to the second electrical signal, is the binary value corresponding to the second digital signal.

[0033] In one embodiment, the first reference voltage is +5V, and the second reference voltage is 0V. At this time, the formula for calculating the first digital signal according to the first electrical signal can be simplified as follows: The formula for calculating the second digital signal according to the second electrical signal can be simplified as follows:

[0034] like Figure 2 As shown, the present invention further includes a display, which is connected to the processor, and receives a signal output by the processor to display the setting angle, the self-test angle, the temperature value, and the result of whether the angle of attack device is faulty. Figure 2 In the embodiment shown, the display model is LCD1602. The upper left corner of the display screen shows the temperature value measured by the thermocouple, the upper right corner is the set angle, the lower right corner is the self-test angle, and the lower left corner indicates whether the angle of attack sensor is in a fault state.

[0035] Among them, LCD1602 liquid crystal display is a widely used character liquid crystal display module. It is composed of a character liquid crystal display (LCD), a control drive main circuit HD44780 and its extended drive circuit HD44100, as well as a small amount of resistors, capacitors and structural parts assembled on a PCB board.

[0036] In one embodiment, the temperature value and the voltage value corresponding to the third electrical signal satisfy the formula: ; Among them is The voltage value corresponding to the third electrical signal, T is the temperature value.

[0037] Figure 3 is a structural diagram of a transmission mechanism according to an embodiment of the present invention.

[0038] like Figure 3As shown, the transmission mechanism also includes a reducer 2, and the clutch unit includes a friction clutch 3 and an electromagnetic clutch 6, wherein the driving end of the motor 11 is connected to the input shaft of the reducer 2, the output shaft of the reducer 2 is connected to the input shaft of the friction clutch 3, the output shaft of the friction clutch 3 is meshed with the driving gear 4 of the electromagnetic clutch 6, and the output shaft of the electromagnetic clutch 6 is meshed with the central gear 7 of the wind direction shaft.

[0039] It should be noted that the reducer 2 reduces the output speed of the motor 11 and transmits it to the next part (i.e., the clutch unit), thereby reducing the speed while increasing the torque output, so that the subsequent clutch unit can operate efficiently at a lower speed. At the same time, by increasing the torque, sufficient power is provided to drive the wind direction shaft (i.e., the center gear 7, the center gear 7 and the weather vane 9 shaft 8 are fixedly connected).

[0040] In one embodiment, the on and off of the electromagnetic clutch 6 is controlled by a self-detection knob. When the self-detection knob turns on the electromagnetic clutch 6, the driving gear 4 of the electromagnetic clutch 6 meshes with the driven gear 5. At this time, the motor 11 receives the control signal, the motor 11 rotates, the reducer 2 decelerates, and the electromagnetic clutch 6 drives the central gear 7 of the weather vane 9 to rotate through the friction clutch 3. The central gear 7 drives the second gear assembly to rotate, and the second gear assembly drives the rotary transformer to output an electrical signal (a first or second electrical signal).

[0041] In the description of this specification, "plurality" or "several" means at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0042] Although this specification has shown and described a number of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will conceive of many modifications, changes and alternatives without departing from the ideas and spirit of the present invention. It should be understood that in the practice of the present invention, various alternatives to the embodiments of the present invention described herein may be employed.

Claims

1. A simulation experimental device for angle of attack sensor testing, characterized in that: include: A control panel, comprising an angle of attack setting knob and a self-detection knob, wherein the control panel sends a control signal to the motor 11 according to the position of the self-detection knob; An angle of attack sensor, comprising a wind vane 9 and a central gear 7 thereof, and a housing assembly, wherein the central gear 7 of the wind vane 9 is connected to an angle of attack setting knob via a first gear assembly, the angle of attack setting knob is used to provide power to the central gear 7 via the first gear assembly, the central gear 7 of the wind vane 9 provides power to the second gear assembly, and the second gear assembly provides power to the rotary transformer; A transmission mechanism, comprising a clutch unit and a motor 11, wherein the motor 11 is connected to the first gear through the clutch unit to provide power to the central gear 7; wherein when the angle of attack setting knob provides power to the central gear 7 and the motor 11 does not provide power to the central gear 7 through the clutch unit, the rotary transformer outputs a first electrical signal; and when the angle of attack setting knob provides power to the central gear 7 and the motor 11 provides power to the central gear 7 through the clutch unit, the rotary transformer outputs a second electrical signal; a housing heating device, which is used to heat the housing of the angle of attack sensor; a thermocouple, which transmits a third electrical signal to the logic judgment circuit, wherein the thermocouple is arranged inside a housing of the heating angle of attack sensor; a logic judgment circuit, which receives the first electrical signal and obtains a setting angle according to the first electrical signal, receives the second electrical signal and obtains a self-test angle according to the second electrical signal, and calculates a temperature value according to the third electrical signal; When the temperature value is greater than or equal to a preset value, the logic judgment circuit determines whether the angle of attack sensor is faulty according to the absolute value of the difference between the self-test angle and the preset angle.

2. The simulation experimental device for angle of attack sensor testing according to claim 1, characterized in that: The transmission mechanism also includes a reducer 2, and the clutch unit includes a friction clutch 3 and an electromagnetic clutch 6, wherein the driving end of the motor 11 is connected to the input shaft of the reducer 2, the output shaft of the reducer 2 is connected to the input shaft of the friction clutch 3, the output shaft of the friction clutch 3 is meshed with the driving gear 4 of the electromagnetic clutch 6, and the output shaft of the electromagnetic clutch 6 is meshed with the central gear 7 of the wind direction shaft.

3. The simulation experimental device for angle of attack sensor testing according to claim 1, characterized in that: The logic judgment unit includes: an A / D converter and a processor, wherein the voltage sampling A / D converter receives the third electrical signal output by the thermocouple and the first electrical signal and the second electrical signal output by the rotary transformer, the A / D converter converts the first electrical signal into a first digital signal, converts the second electrical signal into a second digital signal, converts the third electrical signal into a third digital signal, and inputs the first digital signal, the second digital signal, and the third electrical signal into the processor, the processor determines the setting angle according to the first digital signal, determines the self-test angle according to the second digital signal, calculates the temperature value according to the third digital signal, and determines that the angle of attack sensor is faulty when the temperature value is greater than a preset value and the absolute value of the difference between the self-test angle and the setting angle is greater than a preset threshold.

4. The simulation experimental device for angle of attack sensor testing according to claim 3, characterized in that: It also includes a display, which is connected to the processor. The display receives a signal output by the processor to display the setting angle, the self-test angle, the temperature value, and the result of whether the angle of attack device is faulty.

5. The simulation experimental device for angle of attack sensor testing according to claim 3, characterized in that: The A / D converter is a TLC2543 chip, and the processor is an AT89C51 chip.

6. The simulation experimental device for angle of attack sensor testing according to claim 3, characterized in that: The formula for the A / D converter to calculate the first digital signal according to the first electrical signal is: , where is a preset first reference voltage, is a preset second reference voltage, is the voltage value corresponding to the first electrical signal, is the binary value corresponding to the first digital signal.

7. The simulation experimental device for angle of attack sensor testing according to claim 3, characterized in that: The formula for the A / D converter to calculate the second digital signal according to the second electrical signal is: , where is a preset first reference voltage, is a preset second reference voltage, is the voltage value corresponding to the second electrical signal, is the binary value corresponding to the second digital signal.

8. The simulation experimental device for angle of attack sensor testing according to claim 6 or 7, characterized in that: The first reference voltage is +5V, and the second reference voltage is 0V.

9. The simulation experimental device for angle of attack sensor testing according to claim 1, characterized in that: The temperature value and the voltage value corresponding to the third electrical signal satisfy the formula: ； Among them is The voltage value corresponding to the third electrical signal, T is the temperature value.

10. The simulation experimental device for angle of attack sensor testing according to claim 1, characterized in that: A damper is also included, and the damper is connected to the central gear 7 .

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