A two-point suspension test bench for maglev trains

Abstract

The present invention relates to a two-point suspension test bench for maglev trains, comprising an elastic track beam system with unevenness, a sensor-redundant suspension platform, a connecting device, and a counterweight platform. The elastic track beam system can simulate track unevenness and vehicle-track coupling vibration conditions; the suspension platform employs redundant sensor installation to simulate sensor failure; the electromagnet coils on the suspension platform are connected in two parts in series to simulate electromagnet failure; the connecting device connects the two suspension platforms; and the counterweight platform can simulate load-changing conditions by adding or removing counterweights. Compared to existing technologies, the two-point suspension platform designed in the present invention can selectively simulate various actual operating conditions, allowing for research on suspension control or fault detection algorithms, more closely resembling actual conditions. Algorithms designed based on this test bench are more practically applicable.

Description

Technical Field

[0001] The invention relates to the field of suspension system test equipment, in particular to a two-point suspension test bench for a magnetic levitation train. Background Art

[0002] The suspension system is the foundation of maglev trains and plays a vital role in ensuring safe and smooth train operation. It is a core subsystem of maglev trains. However, the suspension system has complex operating characteristics and operates under harsh conditions, making it one of the subsystems with the highest failure rate. Research on suspension control and fault diagnosis under complex operating conditions is of great value. Existing research is mostly based on single-point linearized suspension models or single-point suspension test benches, which provide a one-sided consideration of operating conditions and fail to reflect actual operating characteristics. Therefore, simulating complex operating conditions such as track irregularities, vehicle-track coupled vibrations, suspension system failures, load variations, and multi-point suspension poses a pressing challenge in both suspension control and suspension fault diagnosis research. Summary of the Invention

[0003] The purpose of the present invention is to provide a two-point suspension test bench for maglev trains in order to overcome the defects of the above-mentioned existing technologies, which are mostly based on single-point linear suspension models or single-point suspension test benches, which consider the working conditions one-sidedly and cannot reflect the actual operating characteristics.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A two-point suspension test bench for a maglev train comprises an uneven elastic track beam system, a sensor redundant suspension platform, and a connecting device. The number of the sensor redundant suspension platforms is at least two, each of which is connected to the connecting device. The bottom of each sensor redundant suspension platform is connected to a counterweight platform, and each sensor redundant suspension platform is installed in the uneven elastic track beam system.

[0006] Furthermore, the uneven elastic track beam system includes an electromagnetic vibration table, a frame and a track plate, the frame is installed on the electromagnetic vibration table, the track plate is movably installed on the top of the frame through an elastic component, and the sensor redundant suspension platform and the counterweight platform are both installed inside the frame.

[0007] Furthermore, the elastic component includes a bolt, a first spring, a second spring, a gasket and a nut. The bolt passes through the track plate and the frame. The first spring, track plate, second spring, frame and nut are located on the outside of the bolt in sequence. The track plate is guided by the bolt and can move between the first spring and the second spring, so as to simulate the elastic characteristics of the track plate through the first spring and the second spring.

[0008] Furthermore, the stiffness of the simulated track beam is adjusted by replacing the first spring and the second spring with different stiffnesses.

[0009] Furthermore, the sensor redundant suspension platform includes a longitudinally distributed displacement sensor, a transversely distributed acceleration sensor, an electromagnet clamp, an electromagnet, a platform plate and a limit platform. The displacement sensor, acceleration sensor and electromagnet clamp are all installed on the platform plate. The electromagnet clamp is connected to the electromagnet, and the platform plate is connected to the uneven elastic track beam system through the limit platform.

[0010] Furthermore, there are multiple displacement sensors, each of which is arranged longitudinally and installed on the platform board to simulate the pitch measurement error of the actual suspension module triple-mode redundant sensor; the acceleration sensor is installed horizontally on the platform board to simulate the suspension sensor failure by disconnecting the connection or operating the acquisition end signal.

[0011] Furthermore, the electromagnet is wound with a first coil and a second coil connected in series, and the first coil is connected in parallel with a circuit breaker to realize electromagnet fault simulation.

[0012] Furthermore, the limit platform includes an aluminum profile body, an angle code and a bolt. One end of the aluminum profile body is fixedly connected to the uneven elastic track beam system, and the other end is fixedly connected to the angle code. The angle code is connected to the platform plate through bolts. The limit platform is used to adjust the height of the platform plate through the bolts, thereby adjusting the initial gap from the electromagnet to the uneven elastic track beam system.

[0013] Furthermore, the connecting device includes a vertical guide module and a pitch rotation module, the vertical guide module includes a support column and a slider, the support column is provided with a slide groove perpendicular to the ground, and the slider is movably connected in the slide groove; the pitch rotation module includes a base bearing, an optical axis, a riding card and a connecting plate, the two ends of the optical axis are respectively connected to the slider through the base bearing, the connecting plate is connected to the optical axis through the riding card, and the two ends of the connecting plate are respectively connected to the sensor redundant suspension platform to form a two-degree-of-freedom two-point suspension platform with vertical translation and pitch rotation.

[0014] Furthermore, the counterweight platform is connected to the bottom of the suspension platform through a steel spring group. The counterweight platform is used to adjust the weight of the suspension platform by adding or subtracting mass blocks, and the suspension stiffness of the counterweight platform is adjusted by replacing the steel spring group.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The two-point suspension test bench designed by the present invention can selectively simulate various actual working conditions, overcoming the problems of single-point suspension and one-sided working conditions of existing test benches. It is closer to the actual situation, and the algorithm designed based on the test bench has more practical application capabilities.

[0017] (2) The uneven working conditions of the maglev track beam can be simulated by using different vibration modes of the electromagnetic vibration table. The vehicle-track coupled vibration conditions of the elastic track beam can be simulated by using the spring connection between the track beam and the frame. Elastic track beams with different stiffness can be simulated by replacing the springs. The passenger boarding and disembarking conditions of the maglev train can be simulated by adding or removing the counterweight on the counterweight platform. Based on the above working conditions, the robust suspension control algorithm can be studied.

[0018] (3) Two-point suspension can achieve mechanical coupling between the two suspension control points on the same side of the suspension frame during the operation of the maglev vehicle.

[0019] (4) By disconnecting the wiring or operating the signal at the acquisition end, the displacement and acceleration sensor failures can be simulated. By switching on the circuit breaker, the electromagnet failure can be simulated. Combined with the above-mentioned track unevenness, load changes and other working conditions, the robust fault diagnosis algorithm of the key components of the suspension system can be studied.

[0020] (5) Combining the research on robust fault diagnosis algorithm and redundant sensor configuration, the fault-tolerant control of the suspension system can be studied. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional schematic diagram of a two-point suspension test bench for medium- and low-speed maglev trains provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the main view of a two-point suspension test bench for medium- and low-speed maglev trains according to the present invention;

[0023] Figure 3 A schematic side view of a two-point suspension test bench for medium- and low-speed maglev trains according to the present invention;

[0024] In the figure, 1. Uneven elastic track beam system, 2. Sensor redundant suspension platform, 3. Connecting device, 4. Counterweight platform, 11. Electromagnetic vibration table, 12. Frame, 13. Track plate, 21. Displacement sensor, 22. Electromagnet fixture, 23. Electromagnet, 24. Platform plate, 25. Limiting platform, 31. Slide groove, 32. Slider, 33. Base bearing, 34. Optical axis, 35. Saddle card, 36. Connecting plate, 41. Steel spring group. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] Example 1

[0029] like Figure 1-3 As shown, this embodiment provides a two-point suspension test bench for a maglev train, including an uneven elastic track beam system 1, a sensor redundant suspension platform 2 and a connecting device 3. The number of the sensor redundant suspension platforms 2 is at least two, and each sensor redundant suspension platform 2 is connected to the connecting device 3. The bottom of each sensor redundant suspension platform 2 is connected to a counterweight platform 4, and each sensor redundant suspension platform 2 is installed in the uneven elastic track beam system 1.

[0030] The uneven elastic track beam system 1 includes an electromagnetic vibration table 11, a frame 12 and a track plate 13. The frame 12 is installed on the electromagnetic vibration table 11. The track plate 13 is movably installed on the top of the frame 12 through an elastic component. The sensor redundant suspension platform 2 and the counterweight platform 4 are both installed inside the frame 12.

[0031] The elastic component includes a bolt, a first spring, a second spring, a gasket and a nut. The bolt passes through the track plate 13 and the frame 12. The first spring, the track plate 13, the second spring, the frame 12 and the nut are located on the outside of the bolt in sequence. The track plate 13 is guided by the bolt and can move between the first spring and the second spring, so as to simulate the elastic characteristics of the track plate 13 through the first spring and the second spring.

[0032] The stiffness of the simulated track beam is adjusted by replacing the first spring and the second spring with different stiffnesses.

[0033] As an optional embodiment, the frame 12 can be made by connecting aluminum profiles, forming the base support and external frame of the two suspension points, and placed on the electromagnetic vibration table 11. The geometric irregularities of the actual track can be converted into vertical vibrations of the track beam in combination with the vehicle speed. The electromagnetic vibration table 11 outputs the corresponding vibration excitation to act on the frame 12, which can simulate the track irregularity working condition. The track plate 13 is installed on the top of the aluminum profile frame 12 by four sets of bolts at the four vertices, a first spring, a track plate, a second spring, a gasket, and a nut. The bolts act as guides, allowing the track plate to have only vertical freedom of movement. The springs are used to simulate the elastic properties of the track beam. When the track beam is excited by the electromagnetic force applied by the electromagnet of the suspension platform, it vibrates, thereby simulating the vehicle-track coupled vibration working condition. The elastic properties of the track beam can be changed by replacing steel springs with different stiffnesses.

[0034] The sensor redundant suspension platform 2 includes a longitudinally distributed displacement sensor 21, a transversely distributed acceleration sensor, an electromagnet clamp 22, an electromagnet 23, a platform plate 24 and a limit platform 25. The displacement sensor 21, the acceleration sensor and the electromagnet clamp 22 are all installed on the platform plate 24. The electromagnet clamp 22 is connected to the electromagnet 23. The platform plate 24 is connected to the uneven elastic track beam system 1 through the limit platform 25.

[0035] There are multiple displacement sensors 21, each of which is arranged longitudinally and installed on the platform plate 24 to simulate the pitch measurement error of the actual suspension module's triple-mode redundant sensor; the acceleration sensor is installed transversely on the platform plate 24 to simulate the suspension sensor failure by disconnecting the connection or operating the acquisition end signal.

[0036] The electromagnet 23 is wound with a first coil and a second coil connected in series. The first coil is connected in parallel with a circuit breaker for realizing fault simulation of the electromagnet 23 .

[0037] The limit platform 25 includes an aluminum profile body, an angle code and a bolt. One end of the aluminum profile body is fixedly connected to the uneven elastic track beam system 1, and the other end is fixedly connected to the angle code. The angle code is connected to the platform plate 24 through bolts. The limit platform 25 is used to adjust the height of the platform plate 24 through bolts, thereby adjusting the initial gap between the electromagnet 23 and the uneven elastic track beam system 1.

[0038] As an optional embodiment, the sensor-redundant suspension platform 2 includes three longitudinally arranged displacement sensors 21, two transversely arranged acceleration sensors, an electromagnet fixture 22, an electromagnet 23, a platform plate 24, and a height-adjustable vertical limiter 25 mounted on the base of the aluminum profile frame 12. The displacement sensors 21 are arranged longitudinally and connected to the platform plate 24 via housing threads and nuts, with a certain distance between them to prevent mutual interference. The three displacement sensors' measurements exhibit a certain deviation during platform pitch motion, simulating the pitch measurement error of the actual suspension module's triple-module redundant sensors. The acceleration sensors are mounted horizontally side by side on the platform plate 24 via magnetic bases. Suspension sensor failure simulation can be achieved by disconnecting the wiring or manipulating the signal at the acquisition end. The electromagnet fixture 22 consists of a flexible bolt and an angle slot. The angle slot is secured to the platform plate 24 via the flexible bolt and clamps the electromagnet 23. The electromagnet 23 is wound with two sets of 8:2 coils, connected in series. The smaller coil is connected in parallel with a circuit breaker, which bypasses the coil to simulate an electromagnet failure. The vertical height adjustable limit platform 25 is composed of an aluminum profile body, an angle bracket, and bolts. The aluminum profile is fixed to the bottom frame, the top is fixed to the angle bracket, and bolts are installed on the other side of the angle bracket. The height of the limit platform 25 is adjusted by the bolts, thereby adjusting the initial gap between the electromagnet 23 and the track plate 13.

[0039] The connecting device 3 includes a vertical guide module and a pitch rotation module. The vertical guide module includes a support column and a slider 32. The support column is provided with a slide groove 31 perpendicular to the ground, and the slider 32 is movably connected in the slide groove 31; the pitch rotation module includes a base bearing 33, an optical axis 34, a riding card 35 and a connecting plate 36. The two ends of the optical axis 34 are respectively connected to the slider 32 through the base bearing 33, and the connecting plate 36 is connected to the optical axis 34 through the riding card 35. The two ends of the connecting plate 36 are respectively connected to the sensor redundant suspension platform 2, forming a two-point suspension platform with two degrees of freedom of vertical translation and pitch rotation.

[0040] As an optional embodiment, the connecting device 3 includes a vertical guide module and a pitch rotation module. The vertical guide module includes a slide 31 and a slider 32. The slider 32 can only slide vertically in the slide 31. The pitch rotation module includes a diamond seat bearing 33, an optical axis 34, a saddle card 35, and a connecting plate 36. The optical axis 34 passes through the diamond seat bearing 33 and is connected to the slider 32 via cylindrical head bolts. The connecting plate 36 is fixed to the saddle card 35 and can rotate around the optical axis. The two ends of the connecting plate are bolted to the two ends of the suspension platform 2, forming a two-point suspension platform with two degrees of freedom of vertical translation and pitch rotation.

[0041] The counterweight platform 4 is connected to the bottom of the suspension platform through a steel spring group 41. The counterweight platform 4 is used to adjust the load of the suspension platform by adding or subtracting mass blocks, and the suspension stiffness of the counterweight platform 4 is adjusted by replacing the steel spring group 41.

[0042] In summary, the present invention can provide a two-point medium- and low-speed maglev train suspension test device that can simulate complex operating conditions such as track irregularities, vehicle-rail coupling vibrations, suspension system failures, and load changes.

[0043] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A two-point suspension test bench for a maglev train, characterized in that: The invention comprises an uneven elastic track beam system (1), a sensor redundant suspension platform (2) and a connecting device (3), wherein the number of the sensor redundant suspension platforms (2) is at least two, each of the sensor redundant suspension platforms (2) is connected to the connecting device (3), the bottom of each sensor redundant suspension platform (2) is connected to a counterweight platform (4), and each sensor redundant suspension platform (2) is installed in the uneven elastic track beam system (1); The uneven elastic track beam system (1) comprises an electromagnetic vibration table (11), a frame (12) and a track plate (13); the frame (12) is mounted on the electromagnetic vibration table (11); the track plate (13) is movably mounted on the top of the frame (12) via an elastic component; and the sensor redundant suspension platform (2) and the counterweight platform (4) are both mounted inside the frame (12); The sensor redundant suspension platform (2) comprises a longitudinally distributed displacement sensor (21), a transversely distributed acceleration sensor, an electromagnet fixture (22), an electromagnet (23), a platform plate (24) and a limit platform (25); the displacement sensor (21), the acceleration sensor and the electromagnet fixture (22) are all mounted on the platform plate (24); the electromagnet fixture (22) is connected to the electromagnet (23); and the platform plate (24) is connected to the uneven elastic track beam system (1) via the limit platform (25); The limiting platform (25) comprises an aluminum profile body, an angle bracket and a bolt. One end of the aluminum profile body is fixedly connected to the uneven elastic track beam system (1), and the other end is fixedly connected to the angle bracket. The angle bracket is connected to the platform plate (24) via a bolt. The limiting platform (25) is used to adjust the height of the platform plate (24) via the bolt, thereby adjusting the initial gap between the electromagnet (23) and the uneven elastic track beam system (1). The connecting device (3) includes a vertical guide module and a pitch rotation module. The vertical guide module includes a support column and a slider (32). The support column is provided with a slide groove (31) perpendicular to the ground. The slider (32) is movably connected in the slide groove (31). The pitch rotation module includes a base bearing (33), an optical axis (34), a riding card (35) and a connecting plate (36). The two ends of the optical axis (34) are respectively connected to the slider (32) through the base bearing (33). The connecting plate (36) is connected to the optical axis (34) through the riding card (35). The two ends of the connecting plate (36) are respectively connected to the sensor redundant suspension platform (2), forming a two-point suspension platform with two degrees of freedom of vertical translation and pitch rotation.

2. A two-point suspension test bench for maglev trains according to claim 1, characterized in that: The elastic component comprises a bolt, a first spring, a second spring, a gasket and a nut. The bolt passes through the track plate (13) and the frame (12). The first spring, the track plate (13), the second spring, the frame (12) and the nut are sequentially located outside the bolt. The track plate (13) is guided by the bolt and can move between the first spring and the second spring, so as to simulate the elastic characteristics of the track plate (13) through the first spring and the second spring.

3. A two-point suspension test bench for maglev trains according to claim 2, characterized in that: The stiffness of the simulated track beam is adjusted by replacing the first spring and the second spring with different stiffnesses.

4. The two-point suspension test bench for a maglev train according to claim 1, characterized in that: The displacement sensors (21) are multiple in number, and each displacement sensor (21) is arranged longitudinally and mounted on a platform plate (24) for simulating the pitch measurement error of a triple-mode redundant sensor of an actual suspension module; the acceleration sensor is mounted transversely on the platform plate (24) for simulating suspension sensor failure by disconnecting a connection or operating a signal at a collection end.

5. The two-point suspension test bench for a maglev train according to claim 1, characterized in that: The electromagnet (23) is wound with a first coil and a second coil connected in series, and the first coil is connected in parallel with a circuit breaker for realizing fault simulation of the electromagnet (23).

6. The two-point suspension test bench for a maglev train according to claim 1, characterized in that: The counterweight platform (4) is connected to the bottom of the sensor redundant suspension platform (2) via a steel spring group (41). The counterweight platform (4) is used to adjust the weight of the sensor redundant suspension platform (2) by adding or subtracting mass blocks, and to adjust the suspension stiffness of the counterweight platform (4) by replacing the steel spring group (41).

Images