Brake system track dynamic test method and test bed

Abstract

This invention belongs to the field of track dynamic testing of braking systems, and particularly relates to a method and test bench for track dynamic testing of braking systems, aiming to improve the accuracy of joint testing of braking systems. The test bench includes: a circular runway (1), a power trolley (2), and a control center (3); a track for placing the power trolley (2) is set on the circular runway (1); the control center (3) controls the movement of the power trolley (2) and the action of the braking system, and receives braking test data fed back by the power trolley (2); a universal mounting platform is set on the power trolley (2), on which the braking system for testing is placed; wheels are installed on the power trolley (2) or the braking system, which are normally raised, and the power trolley (2) contacts the circular runway through the wheels. When braking is tested, the wheels are lowered and raised, and the braking performance of the wheels is tested. This invention can be applied to the field of aviation and vehicle braking testing.

Description

Technical Field

[0001] This invention belongs to the field of track dynamic testing of braking systems, and particularly relates to a method and test bench for track dynamic testing of braking systems. Background Technology

[0002] The key test in the development process of an aircraft anti-skid braking system is the joint test with the main landing gear, which is currently generally completed on an inertial test bench. On the inertial test bench, the main landing gear and braking system remain stationary relative to the test space. A rotating steel drum simulates the ground's movement relative to the landing gear. The drum's counterweight and rotational speed simulate the energy consumed by the landing gear during aircraft braking. A loading device compresses the landing gear and the rotating drum to simulate the load between the main landing gear and the ground caused by the aircraft's gravity.

[0003] The drum surface of the inertial test bench is made of steel, and through surface treatment, grooves are engraved to simulate the cement and asphalt surfaces of a real runway. The accuracy of the simulated engagement coefficient is questionable. After consulting with domestic test bench manufacturers and users, it was found that there are no corresponding standards for testing the drum engagement coefficient, resulting in a long-term state of infrequent or no testing. The test data for the same braking system on different inertial test benches show significant differences, indeed reflecting obvious differences between different drums. Comparison between the braking system inertial test bench data and the actual data of the aircraft's braking system also shows considerable discrepancies. Therefore, the accuracy and representativeness of the braking system inertial test bench test have been questioned considerably.

[0004] The diameter of the drum in an inertial test bench is typically around 5 meters, with an outer circumference of less than 16 meters. In a single braking test, with a braking distance exceeding 500 meters, the drum needs to rotate multiple times to complete one test. During combined braking system tests, frictional heat generated on the drum surface during previous braking laps, along with the adhesion of rubber from tire wear, all affect the engagement coefficient in subsequent braking laps, impacting the accuracy of the test. Inertial test benches also suffer from issues such as inaccurate and unstable load application, difficulty in applying variable loads, and other problems that all affect the accuracy and representativeness of the test results. Summary of the Invention

[0005] The purpose of this invention is to provide a method and test bench for track dynamic testing of braking systems, thereby improving the accuracy of combined testing of braking systems.

[0006] The technical solution of the present invention:

[0007] A track dynamic test bench for a braking system, comprising:

[0008] Circular track 1, powered trolley 2, and control center 3;

[0009] A track for placing the powered trolley 2 is set on the circular track 1; the control center 3 controls the movement of the powered trolley 2 and the action of the braking system, and receives the braking test data fed back by the powered trolley 2;

[0010] A universal mounting platform is set on the power trolley 2, on which a test braking system is placed; wheels are installed on the power trolley 2 or the braking system. Normally, the wheels are raised, and the power trolley 2 contacts the circular track through the wheels. When the braking test is performed, the wheels are lowered and the track is raised to test the braking performance of the wheels.

[0011] The track surface of the circular track 1 consists of at least three laps, simulating a real cement track, asphalt track, and dirt track respectively.

[0012] The length of one lap of the circular track is more than 100 meters.

[0013] Control center 3 is located in the center of the circular runway 1, and control center 3 is connected to the power vehicle 2 via wired or wireless means.

[0014] The powered vehicle 2 simulates the weight of an airplane or vehicle by using counterweights or electromagnetic forces with the track.

[0015] The powered vehicle 2 is equipped with its own fuel or battery; or the powered vehicle 2 is not equipped with fuel or battery, but is connected to the electric power system via a cable.

[0016] The power car 2 is equipped with an active braking device.

[0017] Active braking systems include: brakes, deceleration chute, and reverse drive.

[0018] A method for track dynamic testing of a braking system, comprising:

[0019] Step 1: Install the test machine wheels and braking system onto the universal mounting platform of the power trolley;

[0020] Step 2: Select the circular track surface and place the powered trolley on the corresponding trolley track;

[0021] Step 3: Configure the basic weight of the power car. The power car is counterweighted to simulate the weight of an airplane or vehicle.

[0022] Step 4: Start the acceleration of the power trolley, and accelerate the power trolley to a speed above the braking speed based on the feedback from the speed sensor, and maintain it.

[0023] Step 5: Activate the servo valve loading mechanism to press the machine wheel onto the circular track and apply the correct initial load based on the feedback from the load sensor.

[0024] Step 6: Turn off the power system of the power trolley. When the power trolley decelerates freely on the trolley track and circular track to the starting braking speed, issue a braking command to activate the test braking system and decelerate the power trolley through the wheels.

[0025] Step 7: Adjust the load of the servo loading mechanism according to the preset load spectrum to complete the test.

[0026] Also includes:

[0027] Step 0: All test procedures after the power trolley starts and accelerates are pre-set by the control system to achieve automatic control.

[0028] The beneficial effects of this invention are: by arranging a track trolley on a circular track surface that is consistent with the surface of an aircraft or vehicle runway, and using the trolley to simulate the weight and speed of the aircraft or vehicle, driving the wheels to slide, the method of conducting a braking system dynamic test improves the accuracy and representativeness of the test. Attached Figure Description

[0029] Figure 1 This is a top view of the implementation of the braking system track dynamic test method and test bench according to the present invention.

[0030] Figure 2 This invention provides a schematic diagram of a braking system track dynamic test method and test bench composition. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] A track dynamic test bench for a braking system, such as Figure 1 , 2 As shown, it includes:

[0033] Circular track 1, powered trolley 2, and control center 3;

[0034] A track for placing the powered trolley 2 is set on the circular track 1; the control center 3 controls the movement of the powered trolley 2 and the action of the braking system, and receives the braking test data fed back by the powered trolley 2;

[0035] A universal mounting platform is set on the power trolley 2, on which a test braking system is placed; wheels are installed on the power trolley 2 or the braking system. Normally, the wheels are raised, and the power trolley 2 contacts the circular track through the wheels. When the braking test is performed, the wheels are lowered and the track is raised to test the braking performance of the wheels.

[0036] The circular track consists of multiple inner and outer loops; the track surfaces of different loops simulate cement, asphalt, and soil tracks respectively; the length of one loop of the circular track should be greater than 100 meters; the circular track can simulate the extreme working conditions of the braking system under conditions such as watering, snowfall, and icing.

[0037] The car track is arranged on a circular runway; the car track is arranged in multiple loops according to the circular runway, and the track between adjacent loops can be shared; the car track can support the weight of the powered car simulating the weight of an airplane or vehicle; the car track can support the high-speed gliding of the heavy powered car; the car track can eliminate the centrifugal force when the powered car is gliding at high speed in circles.

[0038] like Figure 2 As shown, the powered trolley is equipped with its own fuel or electric power system; the powered trolley simulates the weight of an aircraft or vehicle through counterweights or electromagnetic force with the track; under load, the powered trolley can accelerate through the power system to increase its running speed to the speed required for the braking system to engage, with a capability of at least 400 km / h; the powered trolley is equipped with a high-pressure oil source, air source, and power source for the braking system, or has space to install the above equipment; the powered trolley is equipped with a platform for installing braking system accessories, pipelines, computers, etc.; the powered trolley is equipped with mechanical interfaces for installing wheels and wheel axles, and should have the ability to expand to accommodate different wheel half-shafts; the powered trolley can have two or more sets of mechanical interfaces for installing wheels and wheel axles to accommodate left and right wheels, or multiple wheels for simultaneous testing; the vertical, horizontal, and front-back spatial positions of the powered trolley's wheel mounting interfaces must ensure stable and reliable wheel running on the circular runway; the powered trolley's wheel mounting interfaces are equipped with torque sensors to detect wheel braking torque in real time and quickly; the powered trolley's wheel mounting interfaces are equipped with servo valve loading mechanisms, which can be used relative to the circular runway... The track adjusts the vertical position of the wheels to accommodate wheels of different radii; the servo loading mechanism of the powered trolley wheels is equipped with load sensors to detect the force exerted by the wheels on the circular track in real time; the servo loading mechanism of the powered trolley wheels has the ability to adjust the load force in real time to simulate the working conditions requiring variable load testing; the powered trolley is equipped with a device to detect its own running speed in real time through speed sensors or spatial positioning; the powered trolley has an emergency stop test function, which should be able to quickly remove the load, and is equipped with active braking devices, such as brakes, deceleration chute, reverse drive, etc.; the powered trolley is equipped with a wheel temperature measurement device to detect the temperature of key parts of the wheels in real time; the powered trolley is equipped with a testing system to collect and record signals such as speed, load, torque, and temperature, and has a post-event playback function; the powered trolley is equipped with an operating system, a testing system, and a braking system; the operator's workspace or interface for remote operation is provided; the laboratory where operators conduct tests on the trolley should have devices to ensure personnel safety; the remote control device or test bench of the powered trolley is located at the center of the circular track.

[0039] The remote control device or test bench is connected to the power vehicle via wired or wireless means.

[0040] This invention also provides a method for testing the track dynamics of a braking system.

[0041] The weight class of the power vehicle is determined based on the weight of the aircraft or vehicle corresponding to the test braking system.

[0042] The size, number, layout, and spacing of the track wheels of the powered vehicle are designed according to its weight class.

[0043] The width, length, and spacing of the trolley track are designed according to the weight class of the power trolley and the trolley track wheels.

[0044] Based on the braking speed of the test braking system and the curvature of the circular track designed for the trolley track wheels, the curvature should be increased as much as possible while minimizing the diameter of the circular track and reducing the footprint under safe skidding conditions.

[0045] The power system of the trolley is designed based on the trolley's weight class, braking system start-up and braking speed, trolley track wheels, and trolley track.

[0046] The servo loading mechanism of the power trolley is designed according to the weight class of the power trolley to ensure that the test machine wheels can support the weight of the power trolley on the circular runway through position adjustment, so as to simulate the load of an aircraft or vehicle on the wheels.

[0047] Experimental operation steps:

[0048] Install the test machine wheels and braking system in appropriate positions on the power trolley;

[0049] Connect the hydraulic power source, air power source, and power supply of the test system;

[0050] Select the appropriate circular track surface based on the test conditions and place the power trolley on the corresponding trolley track.

[0051] Based on the test conditions, the power trolley is configured with a counterweight according to its basic weight.

[0052] The power trolley is started to accelerate according to the test conditions, and the speed of the power trolley is accelerated to above the starting and braking speed according to the feedback of the speed sensor, and maintained.

[0053] The servo valve loading mechanism is activated according to the test conditions, so that the machine wheel presses on the circular track, and the correct initial load is applied according to the feedback from the load sensor.

[0054] When the power system of the trolley is turned off, and the trolley decelerates freely on the trolley track and circular track to the starting braking speed, a braking command is issued to activate the test braking system, which decelerates the trolley through the wheels.

[0055] Adjust the load of the servo loading mechanism according to the preset load spectrum to complete the test;

[0056] All test procedures after the power car starts and accelerates can be pre-set through the (remote) control system to achieve automatic control, including the recording of all test data.

[0057] Once the engineering implementation of a new method for track dynamic testing of braking systems is completed, it can realistically simulate the taxiing environment of aircraft or vehicles to the greatest extent possible, and complete dynamic tests on the braking system and wheels. The obtained test data is authentic and reliable, and has high reference value. The test bench can optimize the control law of the braking system and the braking performance of the wheels through a large number of tests, greatly reducing the workload of on-board testing and avoiding disruptive changes after installation.

[0058] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A rail dynamic test bench for a brake system, characterized in that, include: Circular track (1), powered trolley (2) and control center (3); A track for placing a powered trolley (2) is set on a circular track (1); the control center (3) controls the movement of the powered trolley (2) and the action of the braking system, and receives the braking test data fed back by the powered trolley (2); A universal mounting platform is set on the power trolley (2), and a test braking system is placed on the mounting platform; a wheel is installed on the power trolley (2) or the braking system. The wheel is normally raised, and the power trolley (2) contacts the circular track through the wheel. When the brake test is performed, the wheel is lowered and the wheel is raised to test the braking performance of the wheel. The powered trolley is equipped with its own fuel or power system; it simulates the weight of an aircraft or vehicle through counterweights or electromagnetic forces with the track; under load, the trolley accelerates through traction from the power system to increase its running speed to the speed required for the braking system to engage; it carries a high-pressure oil, air, or power source for the braking system; it includes a platform for mounting braking system accessories, piping, and a computer; it has mechanical interfaces for mounting wheels and wheel axles; there are two or more sets of these mechanical interfaces to accommodate simultaneous testing of left and right wheels or multiple wheels; the vertical, horizontal, and longitudinal spatial positions of the wheel mounting interfaces ensure stable and reliable gliding on the circular runway; and the wheel mounting interfaces are equipped with torque sensors to rapidly detect the braking force of the wheels in real time. The power trolley's wheel mounting interface features a servo valve loading mechanism that adjusts the wheel's vertical position relative to the circular track to accommodate wheels of different radii. The servo loading mechanism for the power trolley's wheels includes a load sensor for real-time, rapid detection of the force exerted by the wheels on the circular track. This mechanism also allows for real-time, rapid adjustment of the load force to simulate conditions requiring variable load testing. The power trolley is equipped with a device for real-time, rapid detection of its own running speed via a speed sensor or spatial positioning. It features an emergency stop function, capable of quickly removing the load, and includes an active braking device. The power trolley is equipped with a wheel temperature measurement device for real-time, rapid detection of the temperature at key wheel locations. Finally, the power trolley includes a testing system for collecting and recording speed, load, torque, and temperature signals.

2. The track dynamic test bench for a braking system as described in claim 1, characterized in that, The circular track (1) has at least three laps inside and outside, simulating a real cement track, asphalt track, and dirt track respectively.

3. The track dynamic test bench for a braking system as described in claim 2, characterized in that, The length of one lap of the circular track (1) is greater than 100 meters.

4. The track dynamic test bench for a braking system as described in claim 1, characterized in that, The control center (3) is located at the center of the circular runway (1), and the control center (3) is connected to the power vehicle (2) via wired or wireless means.

5. A method for testing the track dynamics of a braking system, characterized in that, include: Step 1: Install the test machine wheels and braking system onto the universal mounting platform of the power trolley; Step 2: Select the circular track surface and place the powered trolley on the corresponding trolley track; Step 3: Configure the basic weight of the power car. The power car is counterweighted to simulate the weight of an airplane or vehicle. Step 4: Start the acceleration of the power trolley, and accelerate the power trolley to a speed above the braking speed based on the feedback from the speed sensor, and maintain it. Step 5: Activate the servo valve loading mechanism to press the machine wheel onto the circular track and apply the correct initial load based on the feedback from the load sensor. Step 6: Turn off the power system of the power trolley. When the power trolley decelerates freely on the trolley track and circular track to the starting braking speed, issue a braking command to activate the test braking system and decelerate the power trolley through the wheels. Step 7: Adjust the load of the servo loading mechanism according to the preset load spectrum to complete the test.

6. The method for track dynamic testing of a braking system as described in claim 5, characterized in that, Also includes: Step 0: All test procedures after the power trolley starts and accelerates are pre-set by the control system to achieve automatic control.

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