Aero-engine tachometer test device and test method thereof

Abstract

The invention provides an aero-engine tachometer testing device and a testing method thereof, and relates to the technical field of aero-engine testing. According to the technical scheme, the aeroengine tachometer testing device comprises a box body, a power supply is arranged in the box body, the power supply is electrically connected with a direct-current brushless motor and a programmable controller, a motor control driver of the direct-current brushless motor is electrically connected with the programmable controller, a sensor switching adapter is installed at the output end of the direct-current brushless motor, and the sensor switching adapter is electrically connected with the programmable controller. The sensor switching adapter is provided with an installation interface used for installing a rotating speed sensor to be detected. The outer side of the box body is provided with an input port, an output port, an AC voltmeter and a display screen. The test device has the beneficial effects that the accuracy of a measurement result is remarkably improved, the interference of voltage fluctuation on a measurement process is effectively weakened, and the stability and the reliability of measurement data are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine testing, and in particular to an aero-engine tachometer testing device and a testing method thereof. Background Art

[0002] The aircraft engine tachometer test device plays a vital role in the aviation field. As the "heart" of the aircraft, the speed of the aircraft engine is one of the key parameters reflecting the working status and performance of the engine. The accuracy of the tachometer is directly related to the pilot's judgment of the engine's operating status, which in turn affects the safety and economy of the flight. Testing the tachometer with the test device can ensure the accuracy and reliability of its measurement results and avoid misjudgment or failure caused by tachometer errors. This is of great significance for ensuring flight safety, improving flight efficiency and reducing operating costs.

[0003] The existing aircraft engine tachometer test device mainly drives the active friction wheel to rotate and generate a reference speed through an asynchronous motor. The active friction wheel drives the driven friction wheel to rotate through friction. The position between the active friction wheel and the driven friction wheel is adjusted to control the speed of the driven friction wheel. Finally, the speed of the driven friction wheel is measured and compared with the indication of the tachometer to realize the test of the tachometer.

[0004] However, in practical applications, the speed of asynchronous motors is easily affected by external grid voltage fluctuations, which introduces large speed control errors. In addition, as the use time increases, wear will inevitably occur between the active friction wheel and the driven friction wheel, which will further aggravate the speed deviation and affect the accuracy of the test results. Summary of the invention

[0005] Aiming at the problem that an asynchronous motor is easily affected by voltage and thus causes rotation speed errors, the present invention provides an aviation engine tachometer test device and a test method thereof which are not easily affected by voltage and do not easily cause rotation speed errors.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: an aircraft engine tachometer test device, including a box, a power supply is arranged in the box, the power supply is electrically connected to a DC brushless motor and a programmable controller, the motor control driver of the DC brushless motor is electrically connected to the programmable controller, the output end of the DC brushless motor is installed with a sensor adapter, the sensor adapter is provided with an installation interface for installing a speed sensor to be tested, an input port, an output port, an AC voltmeter and a display screen are arranged on the outside of the box, the input port is electrically connected to the output port, and the input port can be electrically connected to the speed sensor to be tested, the output port can be electrically connected to the indicator of the aircraft engine tachometer to be tested, the AC voltmeter is electrically connected to the input port, and the display screen is electrically connected to the programmable controller. The DC brushless motor can simulate an aircraft engine, and the programmable controller can control and drive the DC brushless motor to rotate through the motor control driver. The speed sensor to be tested on the sensor adapter can detect the rotation of the brushless DC motor and generate a three-phase voltage signal. The three-phase voltage signal can be transmitted to the input port and transmitted to the indicator of the tachometer of the aircraft engine to be tested through the output port. The speed displayed on the tachometer of the aircraft engine to be tested is the parameter of the test to be tested. At the same time, the AC voltmeter can display the three-phase voltage signal of the speed sensor to be tested through the input port. When the value of the three-phase voltage signal is stable, the speed on the tachometer of the aircraft engine to be tested will be displayed. In addition, when the brushless DC motor rotates, the actual speed set by the programmable controller will be displayed on the display. According to the actual speed on the display, adjust the speed displayed on the tachometer of the aircraft engine to be tested to complete the aircraft engine tachometer test.

[0007] Preferably, a control panel is provided on the outside of the box, and a voltage switching knob is provided on the control panel, and the voltage switching knob is electrically connected to the AC voltmeter. By rotating the voltage switching knob, the display mode of the AC voltmeter can be flexibly switched to realize the display of multiple voltage states: including displaying disconnection, AB phase voltage of the speed sensor to be tested, BC phase voltage of the speed sensor to be tested, or AC phase voltage of the speed sensor to be tested.

[0008] Preferably, the control panel is also provided with an operation panel, and the operation panel is electrically connected to the programmable controller. Through the operation panel, the user can conveniently perform customized programming operations on the programmable controller.

[0009] Preferably, the control panel is also provided with a speed adjustment knob, which is electrically connected to the motor control driver and the display screen respectively. The speed adjustment knob allows the user to manually and accurately control the operation of the motor driver. In manual mode, the actual speed set by the speed adjustment knob will be displayed on the display screen.

[0010] Preferably, the side of the box body is provided with heat dissipation holes, which can effectively promote the rapid dispersion and discharge of heat and improve the heat dissipation efficiency.

[0011] Preferably, a handle is provided on the side of the box body, which facilitates the movement of the box body.

[0012] A test method for an aircraft engine tachometer test device comprises the following steps:

[0013] Step 1: Using a motor control driver to drive the brushless DC motor to rotate;

[0014] Step 2: The brushless DC motor rotates to make the speed sensor to be tested generate a three-phase AC voltage signal, which is transmitted to the indicator of the tachometer of the aircraft engine to be tested, and the value of the three-phase AC voltage signal is displayed on the AC voltage meter;

[0015] Step 3, the actual speed of the brushless DC motor is displayed on the display screen;

[0016] Step 4: When the value on the AC voltmeter is stable, compare the value on the display screen with the value on the indicator of the aircraft engine tachometer to be tested, and then calibrate the value on the indicator of the aircraft engine tachometer to be tested.

[0017] Preferably, in step one, the operation panel is operated to enter the program control mode, a preset program is input, and the motor control driver is controlled to sequentially set the speed of the brushless DC motor to 20%, 40%, 60%, 80% and 100% of the maximum speed.

[0018] Preferably, in step one, the operation panel is operated to enter manual mode, and the speed adjustment knob is rotated to manually increase the speed of the brushless DC motor.

[0019] Preferably, in step 2, the voltage switching knob is turned to control the AC voltmeter to measure the AB phase voltage of the speed sensor to be tested, the BC phase voltage of the speed sensor to be tested, or the AC phase voltage of the speed sensor to be tested.

[0020] It can be seen from the above technical solutions that the advantages of the present invention are: the brushless DC motor can simulate an aircraft engine, and its rotation can be accurately controlled by a programmable controller and a motor control driver. The rotation of the brushless DC motor can cause the speed sensor to generate a voltage signal, which is displayed on the AC voltmeter and output to the aircraft engine tachometer to be tested through the output port. The speed displayed on the aircraft engine tachometer to be tested is the parameter of the test to be tested. At the same time, the set actual speed will be displayed on the display screen. According to the actual speed on the display screen, the speed displayed on the aircraft engine tachometer to be tested is adjusted to complete the aircraft engine tachometer test. Since the brushless DC motor has higher speed stability than the asynchronous motor and is more resistant to voltage fluctuations, the device removes the use of the active friction wheel and the driven friction wheel, effectively reducing the speed error. In summary, the test device significantly improves the accuracy of the measurement results, effectively weakens the interference of voltage fluctuations on the measurement process, and ensures the stability and reliability of the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0023] Figure 2 This is the schematic diagram of the brushless DC motor control structure.

[0024] Description of main reference numerals

[0025] In the figure: 1. DC brushless motor, 2. motor control driver, 3. programmable controller, 4. operation panel, 5. AC voltmeter, 6. sensor adapter, 7. power supply, 8. voltage switching knob, 9. speed adjustment knob, 10. switch, 11. input port, 12. output port, 13. inverter, 14. rotor position sensor. DETAILED DESCRIPTION

[0026] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0027] An aircraft engine tachometer test device, such as Figure 1 As shown, it includes a box body, and the side of the box body is provided with heat dissipation holes and a handle. The inside of the box body is equipped with a motor control driver 2 and a programmable controller 3, and the motor control driver 2 and the programmable controller 3 are electrically connected through a cable, and the motor control driver 2 and the programmable controller 3 are both existing devices. A DC brushless motor 1 is connected to the motor control driver 2, and the motor control driver 2 can drive the DC brushless motor 1 to rotate. A power supply 7 is also installed inside the box body, and the power supply 7 is electrically connected to the DC brushless motor 1, the motor control driver 2 and the programmable controller 3 through a cable, and the power supply 7 can provide power to the device. A control panel is arranged outside the box body, and the test device can be controlled by the control panel.

[0028] In this specific embodiment, the control panel specifically adopts the following structure: an operation panel 4 is provided on the control panel, and the operation panel 4 is electrically connected to the programmable controller 3 through a cable. A display screen is installed above the operation panel 4, and the operation panel 4 and the display screen are electrically connected to the programmable controller 3 through a cable. Different types of speed sensor models are selected through the operation panel 4, different aircraft engine speeds are set, and data instructions are formed and sent to the programmable controller 3. The programmable controller 3 controls the motor control driver 2 through instructions, thereby realizing precise control of the rotation of the DC brushless motor 1, and realizing automatic control of the DC brushless motor 1.

[0029] In this specific embodiment, a rotor position sensor 14 is provided inside the brushless DC motor 1, which can detect the rotor position and ensure the normal operation of the brushless DC motor 1. The brushless DC motor 1 works in conjunction with the motor control driver 2 to achieve precise control of the rotation speed, covering a wide range from 1rpm to 10000rpm. The design terminal voltage of the brushless DC motor 1 does not exceed 300V, and the output power is not less than 600W, ensuring a strong driving force. At the same time, the control accuracy is as high as ±1rpm, meeting the needs of high-precision applications. Figure 2 As shown, the voltage equation of the brushless DC motor is as follows:

[0030]

[0031] The electromagnetic torque equation is:

[0032] T em =P n (e a i a +e b i b +e c i c ) / ω r

[0033] Where La , L b , L c is the self-inductance of the three-phase winding, L a =L b =L c ; L ab is the mutual inductance of the A-phase and B-phase windings, and vice versa, L ab =L ba =L ac =L ca =L bc =L cb =M; p is the differential operator; e a 、e b 、e c is the induced electromotive force of the three-phase winding; P n is the angular velocity of the brushless DC motor.

[0034] In this specific embodiment, a speed adjustment knob 9 is added to the control panel, and the speed adjustment knob 9 is electrically connected to the motor control driver 2 through a cable. Rotating the speed adjustment knob 9 can adjust the resistance value of the built-in multi-turn potentiometer, and this change signal is then captured and processed by the motor control driver 2, and then converted through the inverter 13, so as to realize real-time and precise adjustment and control of the speed of the DC brushless motor 1, and realize manual control of the DC brushless motor 1.

[0035] The control panel is integrated with a safe and efficient switch 10, which effectively ensures the electrical safety of the equipment during startup and shutdown, significantly reduces the risk of heating and short circuit, and ensures the safety of operation and the long-term stable operation of the equipment.

[0036] The output end of the brushless DC motor 1 is provided with a sensor adapter 6, and the sensor adapter 6 is provided with a variety of mounting interfaces, and can be installed with a variety of types of speed sensors to be tested, which are the equipment to be tested and are existing equipment. The speed sensor to be tested is provided with a rotor inside, and the rotor is fixedly connected to the output end of the brushless DC motor 1 through a coupling. When the brushless DC motor 1 rotates, the rotor will rotate synchronously and generate a three-phase voltage signal.

[0037] An AC voltmeter 5 is integrated on the control panel, and a voltage switching knob 8 is provided below the AC voltmeter 5. The voltage switching knob 8 is electrically connected to the AC voltmeter 5 through a cable. Rotating the voltage switching knob 8 can switch the display state of the AC voltmeter 5, including displaying disconnection, the AB phase voltage of the speed sensor to be detected, the BC phase voltage of the speed sensor to be detected, or the AC phase voltage of the speed sensor to be detected.

[0038] An input port 11 and an output port 12 are provided on the outside of the box, and the input port 11 and the output port 12 are electrically connected through a cable, and the input port 11 can be electrically connected to the speed sensor to be tested through a cable, and the output port 12 can be electrically connected to the indicator of the aircraft engine tachometer to be tested through a cable. The voltage signal generated by the speed sensor to be tested can be displayed on the AC voltmeter 5 through the input port 11. At the same time, the voltage signal generated by the speed sensor to be tested can be output from the output port 12 and displayed on the indicator of the aircraft engine tachometer to be tested.

[0039] In addition, the speed adjustment knob 9 is electrically connected to the display screen, and when the actual speed of the DC brushless motor 1 is adjusted by the speed adjustment knob 9, the actual speed of the DC brushless motor 1 is directly displayed on the display screen. Similarly, when the actual speed of the DC brushless motor 1 is adjusted by the programmable controller 3, the actual speed of the DC brushless motor 1 is also directly displayed on the display screen.

[0040] In this specific embodiment, the power supply 7 supports flexible input voltage configuration, which can accept 220VAC AC input and directly connect to 28VDC DC input, thereby fully meeting the diverse power requirements of the entire equipment system and ensuring stable operation of the equipment and efficient energy consumption management.

[0041] Embodiment 2: A test method of the aircraft engine tachometer test device in Embodiment 1,

[0042] Mode 1: Program-controlled mode:

[0043] Programming start: By operating the operation panel 4, inputting the preset program, and selecting the appropriate speed sensor to be tested, the motor control driver 2 is used to drive the brushless DC motor 1 to rotate.

[0044] Test calibration: Set the initial detection speed of the brushless DC motor 1 to 20% of the maximum speed, and start the automatic test process. After the brushless DC motor 1 reaches the target speed stably, the output end of the brushless DC motor 1 drives the rotor of the speed sensor to be tested to rotate synchronously, generating a three-phase AC voltage signal, which will be displayed on the AC voltmeter 5 through the input port 11. Turning the rotary voltage switching knob 8 can switch the display state of the AC voltmeter 5, including displaying disconnection, the AB phase voltage of the speed sensor to be tested, the BC phase voltage of the speed sensor to be tested, or the AC phase voltage of the speed sensor to be tested. At the same time, this voltage signal will also be transmitted to the indicator of the aircraft engine tachometer to be tested through the output port 12, and the speed displayed on the indicator of the aircraft engine tachometer to be tested is the speed to be tested.

[0045] In addition, when the output end of the brushless DC motor 1 rotates, the set actual speed value is transmitted to the display screen for display. According to the actual speed on the display screen, the speed displayed on the tachometer of the aircraft engine to be tested is adjusted to complete the aircraft engine tachometer test.

[0046] Multi-point detection: Repeat the above steps to test the performance at 40%, 60%, 80%, and finally 100% of the maximum speed.

[0047] End the process: After the detection is completed, press the exit key, the DC brushless motor 1 will automatically decelerate and stop running, and then manually turn off the DC power supply 7 to end the detection process.

[0048] Mode 2: Manual mode:

[0049] Manual start: Enter the manual mode by operating the operation panel 4, and use the motor control driver 2 to drive the brushless DC motor 1 to rotate.

[0050] Test calibration: Gently rotate the speed adjustment knob 9 to slowly increase the speed of the brushless DC motor 1 in a clockwise direction. After the brushless DC motor 1 reaches the target speed stably, the output end of the brushless DC motor 1 drives the rotor of the speed sensor to be tested to rotate synchronously, generating a three-phase AC voltage signal, which will be displayed on the AC voltmeter 5 through the input port 11. Turning the voltage switching knob 8 can switch the display state of the AC voltmeter 5, including displaying disconnection, the AB phase voltage of the speed sensor to be tested, the BC phase voltage of the speed sensor to be tested, or the AC phase voltage of the speed sensor to be tested. At the same time, this voltage signal will also be transmitted to the indicator of the aircraft engine tachometer to be tested through the output port 12, and the speed displayed on the indicator of the aircraft engine tachometer to be tested is the speed to be tested.

[0051] In addition, when the output end of the brushless DC motor 1 rotates, the set actual speed value is transmitted to the display screen for display. According to the actual speed on the display screen, the speed displayed on the tachometer of the aircraft engine to be tested is adjusted to complete the aircraft engine tachometer test.

[0052] End the process: After the detection is completed, press the exit key, the DC brushless motor 1 will automatically decelerate and stop running, and then manually turn off the DC power supply 7 to end the detection process.

[0053] It can be seen from the above embodiments that the beneficial effect of the present invention is that the brushless DC motor can simulate an aircraft engine, and its rotation can be accurately controlled by a programmable controller and a motor control driver. The rotation of the brushless DC motor can cause the speed sensor to generate a voltage signal, which is displayed on the AC voltmeter and output to the aircraft engine tachometer to be tested through the output port. The speed displayed on the aircraft engine tachometer to be tested is the parameter of the test to be tested. At the same time, the set actual speed will be displayed on the display screen. According to the actual speed on the display screen, the speed displayed on the aircraft engine tachometer to be tested is adjusted to complete the aircraft engine tachometer test. Since the brushless DC motor has higher speed stability than the asynchronous motor and is more resistant to voltage fluctuations, the device removes the use of the active friction wheel and the driven friction wheel, effectively reducing the speed error. In summary, the test device significantly improves the accuracy of the measurement results, effectively weakens the interference of voltage fluctuations on the measurement process, and ensures the stability and reliability of the measurement data.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aircraft engine tachometer test device, comprising a box, characterized in that: A power supply (7) is arranged in the box, the power supply (7) is electrically connected to a brushless DC motor (1) and a programmable controller (3), a motor control driver (2) of the brushless DC motor (1) is electrically connected to the programmable controller (3), a sensor adapter (6) is installed at the output end of the brushless DC motor (1), and a mounting interface for installing a speed sensor to be tested is arranged on the sensor adapter (6), an input port (11), an output port (12), an AC voltmeter (5) and a display screen are arranged outside the box, the input port (11) is electrically connected to the output port (12), and the input port (11) can be electrically connected to the speed sensor to be tested, the output port (12) can be electrically connected to an indicator of a speed meter of an aircraft engine to be tested, the AC voltmeter (5) is electrically connected to the input port (11), and the display screen is electrically connected to the programmable controller (3).

2. The aircraft engine tachometer test device according to claim 1, characterized in that: A control panel is arranged on the outside of the box body, and a voltage switching knob (8) is arranged on the control panel. The voltage switching knob (8) is electrically connected to the AC voltmeter (5).

3. The aircraft engine tachometer test device according to claim 2, characterized in that: An operation panel (4) is also provided on the control panel, and the operation panel (4) is electrically connected to the programmable controller (3).

4. The aircraft engine tachometer test device according to claim 3, characterized in that: A speed regulating knob (9) is also provided on the control panel, and the speed regulating knob (9) is electrically connected to the motor control driver (2) and the display screen respectively.

5. The aircraft engine tachometer test device according to claim 1, characterized in that: Heat dissipation holes are arranged on the side of the box body.

6. The aircraft engine tachometer test device according to claim 1, characterized in that: A handle is arranged on the side of the box body.

7. A test method for an aircraft engine tachometer test device, characterized in that: The aircraft engine tachometer test device as claimed in claim 4 comprises the following steps: Step 1: using a motor control driver (2) to drive a brushless DC motor (1) to rotate; Step 2: The brushless DC motor (1) rotates so that the speed sensor to be tested generates a three-phase AC voltage signal, and the three-phase AC voltage signal is transmitted to the indicator of the tachometer of the aircraft engine to be tested, and the value of the three-phase AC voltage signal is displayed on the AC voltage meter (5); Step 3, the actual speed of the brushless DC motor (1) is displayed on a display screen; Step 4: When the value on the AC voltmeter (5) is stable, the value on the display screen is compared with the value on the indicator of the aircraft engine tachometer to be tested, and then the value on the indicator of the aircraft engine tachometer to be tested is calibrated.

8. The test method of the aircraft engine tachometer test device according to claim 7, characterized in that: In step one, the program control mode is entered by operating the operation panel (4), and a preset program is input to control the motor control driver (2) to sequentially set the rotation speed of the brushless DC motor (1) to 20%, 40%, 60%, 80% and 100% of the maximum rotation speed.

9. The test method of the aircraft engine tachometer test device according to claim 7, characterized in that: In step one, the operation panel (4) is operated to enter the manual mode, and the speed adjustment knob (9) is rotated to manually increase the speed of the brushless DC motor (1).

10. The test method of the aircraft engine tachometer test device according to claim 7, characterized in that: In step 2, the voltage switching knob (8) is turned to control the AC voltmeter (5) to measure the AB phase voltage of the speed sensor to be tested, the BC phase voltage of the speed sensor to be tested, or the AC phase voltage of the speed sensor to be tested.

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