Test device and test method for simulating intelligent regulation and control of height of train body

Abstract

The test device for simulating the intelligent regulation and control of the train body height comprises a fixing unit and a test unit, the fixing unit is used for simulating a railway vehicle body and installing an air spring in the fixing unit, and the fixing unit is installed at the upper end and the lower end of the air spring and clamps and fixes the air spring to be tested; the test unit comprises a loading device, an air intake and exhaust device, a secondary suspension device, an induction device and a control device; the induction device is arranged in the air spring, and the height change of the air spring is measured through the induction device and fed back to the control device. The control device controls electromagnetic valve switches of the air inlet device and the air exhaust device according to the height change of the air spring measured by the sensing device so as to achieve air inflation and air exhaust of the air spring, and therefore the height of the air spring is changed. The influence of the secondary suspension device on the internal pressure of the air spring required by height adjustment is detected and researched, and data reference is provided for actual vehicle body manufacturing.

Description

Technical Field

[0001] The invention relates to a test device and a test method for simulating intelligent control of train body height, belonging to the field of train system experimental devices. Background Art

[0002] As the core component of the secondary suspension system of subway trains, the performance of air springs has a significant impact on the running stability, riding comfort and safety of trains. Air springs can effectively attenuate the vibration and impact generated during the movement of trains by precisely regulating the internal air pressure, ensuring the stability of the internal environment of the carriage, thereby optimizing the riding experience of passengers.

[0003] From the perspective of safety, air springs can adjust their load distribution in a timely manner according to the dynamic changes in the train load, maintain the stable driving posture of the train under complex working conditions, and effectively reduce the safety risks caused by the center of gravity shift. In addition, in the event of emergency braking or emergencies, the rapid response capability of air springs provides additional stability for the train and enhances the overall safety performance of the train.

[0004] In summary, the application of air springs in subway trains not only improves riding comfort, but also plays an important role in ensuring the safety of train operation. However, the existing train air springs can only be adjusted in small increments, and the air springs cannot be adjusted to achieve the function of aligning the train floor height with the platform height.

[0005] After searching, 202210059661.6 discloses a real-time adjustment system for the air spring of a rail vehicle suspension, including multiple carriages, an articulated structure is provided between two adjacent carriages, an air suspension and a roll angle sensor are provided at the lower end of the carriage, and a height sensor is provided on both sides of the carriage; the signal transmission lines of the roll angle sensor and the height sensor are respectively connected to the signal input end of the single-chip microcomputer, and the control line of the air suspension is connected to the signal input and output ends of the single-chip microcomputer. When the vehicle stops at the platform, the air springs of all air suspensions on the side of the vehicle close to the platform are exhausted or inflated, so that the carriage rolls slightly to facilitate passengers getting on and off. This design has height sensors on both sides of the carriage, and does not involve the linkage between the lifting height of the air spring and the required height of the vehicle body. The conventional height adjustment is disturbed by space reasons due to the connection of other structures in the system, and the lifting height cannot reach the height required for extraordinary height adjustment. In addition, other interfering factors such as different passenger weights and different internal pressures loaded on the air springs are not considered in the prior art.

[0006] Most of the existing air spring height adjustment experiments are ideas and concepts. How to provide a practical test device to simulate the intelligent height adjustment of the train body, simulate the need for height adjustment under actual train conditions, consider the impact of different interference factors on the air spring, such as platform height and passengers getting on and off the train, and invent an intelligent height adjustment test device to provide reliable test data for the engineering application research of air spring intelligent height adjustment is very necessary. Summary of the invention

[0007] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a test device for simulating intelligent control of the height of a train body. By scientifically installing the test unit and the fixing unit in conjunction with the air spring, not only can the height of the air spring be accurately controlled, but also by reasonably configuring the loading device, the air intake and exhaust device, the secondary suspension device and the control device, the space can be utilized to the maximum extent, and the interference factors in the process of adjusting the air spring height can be controlled, and extraordinary height adjustment operations can be achieved, which is more suitable for use in different situations. At the same time, it can improve the riding comfort of passengers and ensure the safety and stability of train operation.

[0008] The test device for simulating intelligent control of train body height of the present invention arranges a sensing device inside the air spring. The sensing device cooperates with the control device to more accurately control the lifting and lowering of the air spring, thereby realizing the adjustment of the simulated body height.

[0009] In order to achieve the above object, the present invention proposes the following technical solutions: A test device for simulating intelligent height control of a train body is disclosed, comprising a fixing unit and a test unit, wherein the fixing unit is used to simulate a rail vehicle body, an air spring is installed in the fixing unit, and the fixing unit is installed at the upper and lower ends of the air spring to clamp and fix the air spring to be tested; the test unit comprises a loading device, an air intake and exhaust device, a secondary suspension device, a sensing device and a control device; the sensing device is arranged inside the air spring, and the height of the air spring is measured by the sensing device and fed back to the control device, and the control device controls the solenoid valve switch of the air intake and exhaust device according to the change in the height of the air spring measured by the sensing device to realize the inflation and exhaust of the air spring, thereby changing the height of the air spring. The secondary suspension device generates a resistance effect on the fixing unit during the change in the height of the air spring, thereby causing the internal pressure of the air spring to change, and the pressure change of the air spring during the height change is measured by installing a pressure sensor inside the air spring. In order to detect and study the influence of the secondary suspension device on the internal pressure of the air spring required for height adjustment, data reference is provided for actual vehicle body manufacturing; the control device controls the air intake and exhaust device according to the height to realize the inflation and exhaust of the air spring, thereby raising or lowering the height of the air spring, and the fixed unit connected to the air spring changes with the height change of the air spring, driving the secondary suspension device installed on the fixed unit to rise and fall synchronously.

[0010] The test device for simulating intelligent control of train body height of the present invention focuses on simulating trains, simulating the fixed unit as a vehicle body, which can not only fix the air spring to be tested, but also is the overall framework of the test device, which can effectively combine various devices into one, and simulate the structures that may affect the lifting and lowering of the air spring, so as to provide a reliable reference for how much internal pressure needs to be added to the air spring for the actual height adjustment of the train. And the secondary suspension device is arranged between the fixed devices, which can effectively simulate various situations such as transmission and torsion of the train body. The induction device is arranged inside the air spring, which can make it easier to find the test surface, so that the lifting height of the air spring can be fed back more accurately, so as to more accurately test the changes in the lifting and lowering of the entire train body.

[0011] Furthermore, the air springs are arranged in pairs and are placed on both sides of the fixing unit; the fixing unit includes an upper clamping device and a lower clamping device arranged at the upper and lower ends of the air spring, an H-shaped connecting frame is installed on one side of the upper clamping device, and an air intake and exhaust device and a secondary suspension device are installed on the H-shaped connecting frame to link the air springs and the test unit on both sides. The air springs are arranged in pairs, and the inflation and exhaust of the air springs can be adjusted at the same time to achieve the lifting and lowering of the frame as a whole; it can also achieve the operation of inflating on one side and exhausting on the other side to tilt the frame, providing test data and reference for the adjustment of the vehicle body floor and platform height when the vehicle arrives at the station.

[0012] Furthermore, the loading device includes a cylinder arranged on the H-shaped connecting frame, which provides vertical loading for the air spring, and the loading load is adjusted to simulate vehicles of different specifications. The cylinder is preferably a dual-channel vertical hydraulic cylinder that simulates the vertical load of the vehicle body, and the air spring is vertically loaded through the cylinder to simulate the weight of the actual vehicle body, so that the test data is more referenceable.

[0013] Furthermore, a central traction device is arranged between the paired air springs, and the central traction device includes a traction pin seat and traction rods arranged on both sides of the traction pin seat, and the center of the traction pin seat is fixedly connected to the H-shaped connecting frame.

[0014] Furthermore, the upper clamping device includes a top plate 1 and a bottom plate 1, and a support body 1 connecting the top plate 1 and the bottom plate 1; a placement cavity is formed between the top plate 1 and the bottom plate; the air intake and exhaust device is installed on the top of the air spring through the placement cavity; the lower clamping device includes a top plate 2 and a bottom plate 2, and a support body 2 connecting the top plate 2 and the bottom plate 2; the top plate 2 and the bottom plate 2 are respectively in contact with the upper and lower ends of the air spring. Both the upper and lower clamping devices are provided with cavities, and the air intake and exhaust device and the air pipeline can be installed in the cavity, which reduces the interference between the structures and makes the test results more accurate.

[0015] Furthermore, the edge of the top plate 1 is provided with a mounting wing plate 1 with a protruding edge, and the edge of the bottom plate 2 is provided with a mounting wing plate 2 with a protruding edge; the wing plate 1 and the wing plate 2 are arranged opposite to each other for installing a vertical shock absorber, and the stretching direction of the vertical shock absorber is consistent with the height adjustment direction of the air spring.

[0016] Furthermore, the H-shaped connecting frame includes two parallel side beams and a cross beam connecting the side beams and being perpendicular to the side beams. An anti-roll torsion bar is arranged on one side of the lower clamping device. The anti-roll torsion bar includes a torsion bar shaft consistent with the extension direction of the side beam. Symmetrical torsion arms are arranged at both ends of the torsion bar shaft. The end of the torsion arm is connected to one end of a vertical connecting rod, and the other end of the vertical connecting rod is fixedly connected to the side beam.

[0017] Furthermore, the air spring includes an airbag, an airbag cavity enclosed by an upper cover plate and a pressure plate, an auxiliary spring is installed at the lower end of the pressure plate, and the auxiliary spring includes a centrally arranged core shaft, and an inner groove body is arranged at the center of the core shaft close to the pressure plate for installing a displacement sensor; an accommodating space is arranged at the center of the core shaft on the side away from the pressure plate to accommodate a signal transmission line of the displacement sensor; a sealing device is arranged circumferentially of the displacement sensor.

[0018] Considering the actual situation, the test device is set in the mandrel at the bottom of the air spring, which makes it easier to find the test surface, and the displacement sensor is preferably a high-pressure resistant ultrasonic sensor, which converts ultrasonic signals into other energy signals (usually electrical signals). They use the physical properties of ultrasound, such as high-frequency vibration and good directivity, to detect and measure the distance of objects. The working principle of this sensor is based on sending sound waves of a specific frequency. When the sound waves encounter an object and reflect back, the sensor receives the reflected sound waves and determines the distance between the object and the sensor by calculating the time difference between the sending and receiving of the sound waves. Since the ultrasonic sensor is connected to the airbag of the air spring, considering the reliability and durability of use, a high-pressure resistant ultrasonic sensor is selected, so that the lifting height of the air spring can still be more accurately fed back under the high-pressure environment inside the air spring, and the maximum lifting height can reach more than 150mm, and the maximum tilting angle can reach 10 degrees, and the height change of the vehicle body can still be accurately measured and fed back.

[0019] Furthermore, the oil cylinder is provided with a displacement sensor and a force sensor, and in the process of simulating the lifting and lowering of the vehicle body, the displacement and force in the test process can be measured in real time through the sensors.

[0020] Another object of the present invention is to disclose a test method for the above-mentioned test device for simulating intelligent control of train body height, wherein a pair of air springs are installed in a fixed unit, and air intake and exhaust devices are connected. By sensing the height of the air springs, a control device controls the opening and closing of the air intake and exhaust devices to adjust the height of the air springs; at the same time, the central traction device, anti-roll torsion bar, and vertical shock absorber are adjusted and driven through the H-type connecting frame to obtain the changes in the internal pressure of the air spring caused by the central traction device, anti-roll torsion bar, and vertical shock absorber during the height adjustment process.

[0021] Compared with the prior art, the present invention has the following beneficial effects: This test device for simulating intelligent control of train body height can not only accurately control the height of the air spring by scientifically installing the test unit and the fixing unit in conjunction with the air spring, but also maximizes the use of space by reasonably configuring the loading device, the air intake and exhaust device, the secondary suspension device and the control device. This makes the interference in the air spring height adjustment process controllable and can achieve extraordinary height adjustment operations. It is more suitable for use in different situations, while improving the riding comfort of passengers and ensuring the safety and stability of train operation.

[0022] At the same time, the test device for simulating intelligent control of train body height of the present invention focuses on simulating trains, simulating the fixed unit as a vehicle body, which can not only fix the air spring to be tested, but also is the overall framework of the test device, which can effectively combine the various partial devices into one, and simulate the structures that may affect the lifting and lowering of the air spring, so as to provide a reliable reference for how much internal pressure needs to be added to the air spring for the actual height adjustment of the train. And the secondary suspension device is arranged between the fixed devices, which can effectively simulate various situations such as transmission and torsion of the train body. The induction device is arranged inside the air spring, which can make it easier to find the test surface, so that the lifting height of the air spring can be fed back more accurately, so as to more accurately test the changes in the lifting and lowering of the entire train body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the test device for simulating intelligent control of train body height according to the present invention.

[0024] Figure 2 This is a schematic diagram of the overall structure of another direction of the test device for simulating intelligent control of train body height according to the present invention.

[0025] Figure 3 It is an internal cross-sectional view of the air spring and auxiliary spring of the present invention.

[0026] Description of the accompanying drawings: 1-oil cylinder, 2-H-type connecting frame, 21-lower clamping device, 22-upper clamping device, 211-top plate 2, 212-bottom plate 2, 213-support body 2, 221-top plate 1, 222-bottom plate 1, 223-support body 1, 2211-installation wing plate 1, 2121-installation wing plate 2, 23-cross beam, 24-side beam, 3-air spring, 31-air bag, 32-upper cover plate, 33-pressure plate, 34-wear plate, 35- Rubber, 36-air guide tube, 37-accommodation space, 38-signal transmission line, 39-signal transmission cavity, 4-vertical shock absorber, 5-central traction device, 51-traction pin seat, 52-traction rod, 53-stud, 6-anti-roll torsion bar, 61-torsion bar shaft, 62-torsion arm, 7-intake and exhaust device, 8-vertical connecting rod, 9-auxiliary spring, 91-core shaft, 92-inner groove body, 100-displacement sensor, 200-sealing device, 300-base. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-Figure 3 The present invention is described in further detail. Example 1

[0028] like Figure 1-Figure 3 As shown, the test device for simulating the intelligent control of the height of the train body in this embodiment integrates the fixing unit and the test unit into one to realize the simulation of the actual working condition. The fixing unit is used to simulate the rail vehicle body, and the air spring 3 is installed in the fixing unit. The fixing unit is installed at the upper and lower ends of the air spring 3 to clamp and fix the air spring 3 to be tested; the test unit includes a loading device, an air intake and exhaust device 7, a secondary suspension device (such as a vertical shock absorber, a central traction device, an anti-roll torsion bar, etc.), a sensing device and a control device; the sensing device is arranged inside the air spring 3, and the height of the air spring 3 is measured by the sensing device and fed back to the control device to detect the influence of the secondary suspension device on the internal pressure of the air spring 3 required for height adjustment, so as to provide data reference for the actual car body manufacturing; the control device controls the air intake and exhaust device 7 according to the height to realize the inflation and exhaust of the air spring 3, so that the height of the air spring 3 is increased or decreased, and the fixing unit connected to the air spring 3 changes with the height change of the air spring 3, driving the secondary suspension device installed on the fixing unit to be lifted and lowered synchronously. This test device takes all the factors affecting the secondary suspension system into consideration. In order to examine the effects of various components on the lifting and lowering of the air spring, both the loading device and the secondary suspension device are taken into consideration.

[0029] The secondary suspension device generates resistance to the fixed unit during the height change of the air spring, which causes the internal pressure of the air spring to change. The pressure sensor installed inside the air spring is used to measure the pressure change of the air spring during the height change process. This is to detect and study the influence of the secondary suspension device on the internal pressure of the air spring required for height adjustment, and provide data reference for actual vehicle body manufacturing.

[0030] The control device (not shown) is mainly used to control the opening and closing of the air intake and exhaust device 7, and can realize the above functions. The control program of the control device is set, and the air inlet electromagnetic valve of the air intake and exhaust device 7 is controlled by the program to open or close for inflation or exhaust.

[0031] Specifically, the loading device includes a cylinder 1 arranged on an H-shaped connecting frame 2, which provides vertical loading for the air spring 3, and adjusts the loading load to simulate vehicles of different specifications. The cylinder is preferably a dual-channel vertical hydraulic cylinder that simulates the vertical load of the vehicle body. The cylinder 1 is used to vertically load the air spring 3 to simulate the weight of the actual vehicle body, making the test data more referenceable. The cylinder 1 is provided with a displacement sensor and a force sensor, which can measure the displacement and force in the test process in real time during the process of simulating the lifting and lowering of the vehicle body.

[0032] The air springs 3 in this embodiment are arranged in pairs and are placed on both sides of the fixed unit; the fixed unit includes an upper clamping device 22 and a lower clamping device 21 arranged at the upper and lower ends of the air spring 3, and an H-shaped connecting frame 2 is installed on one side of the upper clamping device 22, and the air intake and exhaust device 7 and the two-series suspension device are installed on the H-shaped connecting frame 2 to link the air springs 3 and the test unit on both sides. The upper clamping device 22 includes a top plate 221 and a bottom plate 222, and a support body 223 connecting the top plate 221 and the bottom plate 222; a placement cavity is formed between the top plate 221 and the bottom plate 222; the air intake and exhaust device 7 is installed on the top of the air spring 3 through the placement cavity; the lower clamping device 21 includes a top plate 211 and a bottom plate 212, and a support body 213 connecting the top plate 211 and the bottom plate 212; the top plate 211 and the bottom plate 212 are in contact with the upper and lower ends of the air spring 3 respectively. The air springs 3 are arranged in pairs, and the inflation and exhaust of the air springs can be adjusted at the same time to achieve the lifting and lowering of the frame as a whole; it can also achieve the operation of inflating on one side and exhausting on the other side to tilt the frame, providing test data and reference for the adjustment of the vehicle body floor and platform height when the vehicle arrives at the station. The H-shaped connecting frame 2 includes two parallel side beams 24 and a crossbeam 23 connecting the side beams 24 and perpendicular to the side beams. An anti-roll torsion bar 6 is arranged on one side of the lower clamping device 21. The anti-roll torsion bar 6 includes a torsion bar shaft 61 that extends in the same direction as the side beam 24. Symmetrical torsion arms 62 are arranged at both ends of the torsion bar shaft 61. The end of the torsion arm 62 is connected to one end of the vertical connecting rod 8, and the other end of the vertical connecting rod 8 is fixedly connected to the side beam 24.

[0033] At the same time, a central traction device 5 is arranged between the paired air springs 3, and the central traction device 5 includes a traction pin seat 51 and a traction rod 52 arranged on both sides of the traction pin seat 51, and the traction pin seat 5 is fixedly connected to the H-type connecting frame 2. In this embodiment, a pair of central traction installation tooling plates are symmetrically arranged on the front and rear sides of the H-type connecting frame 2, which are two inverted T-shaped plates, with a pin seat that cooperates with the traction rod 52 arranged on the inner side, and a vertical reinforcement plate arranged on the outer side to ensure the stability of the installation of the entire traction device 5. At the same time, the traction pin seat 51 is detachably connected to the crossbeam 23 of the H-type connecting frame 2 through a stud 53. When the air spring is inflated, the upper clamping device 22 rises with the lifting of the air spring, and at this time, the crossbeam 23 drives the traction device 5 to move synchronously. This method simulates the real working condition of the train body, and can be tested through simulation to test how much air pressure the air intake and exhaust device 7 needs to give to the inside of the air spring 3 to rise to the required height.

[0034] The edge of the top plate 221 is provided with a mounting wing plate 2211 with a protruding edge, and the edge of the bottom plate 212 is provided with a mounting wing plate 2121 with a protruding edge; the mounting wing plate 2211 and the mounting wing plate 2121 are arranged opposite to each other and are used to install the vertical shock absorber 4, and the stretching direction of the vertical shock absorber 4 is consistent with the height adjustment direction of the air spring 3.

[0035] In this embodiment, the air spring 3 includes an airbag cavity surrounded by an airbag 31, an upper cover plate 32 and a pressure plate 33. An auxiliary spring 9 is installed at the lower end of the pressure plate 33, and the auxiliary spring 9 is installed on the base 300. The auxiliary spring 9 includes a centrally arranged mandrel 91 and a rubber 35 enclosed outside the core. The mandrel 91 is a frustum-shaped structure. An inner groove body 92 is arranged at the center of the frustum structure near the pressure plate, which is used to install the displacement sensor 100; a receiving space 37 is arranged at the center of the mandrel 91 on the side away from the pressure plate 33 to accommodate the signal transmission line 102 of the displacement sensor 100; and a sealing device 200 is arranged circumferentially around the displacement sensor 100. An air guide 36 is installed on the upper cover plate 32 to communicate with the intake and exhaust device 7, and the intake and exhaust device 7 is an intake pipe regulated by a solenoid valve; a wear plate 34 is arranged on the top of the pressure plate 33. In this embodiment, a signal transmission cavity 39 is arranged at the center of the pressure plate 33 and the wear plate 34, so that the signal of the displacement sensor 100 can pass through. A signal transmission line 38 is arranged at the bottom of the displacement sensor 100 and placed inside the accommodation space 37. The accommodation space 37 not only has an accommodation function but also serves as a weight-reducing hole. The ultrasonic sensor displacement sensor 100 is preferably a high-pressure resistant ultrasonic sensor, which is a sensor that converts ultrasonic signals into other energy signals (usually electrical signals). They use the physical properties of ultrasonic waves, such as high-frequency vibration and good directivity, to detect and measure the distance of objects. The working principle of this sensor is based on sending sound waves of a specific frequency. When the sound waves encounter an object and reflect back, the sensor receives the reflected sound waves and determines the distance between the object and the sensor by calculating the time difference between the sending and receiving of the sound waves. Since the ultrasonic sensor is connected to the airbag of the air spring, considering the reliability and durability of use, a high-pressure resistant ultrasonic sensor is selected to make the lifting height of the air spring more accurately fed back, so that the maximum lifting height can reach more than 150mm, and the maximum tilting angle can reach 10 degrees, and the height change of the vehicle body can still be accurately measured and fed back.

[0036] In order to better study the changes in the internal pressure of the air spring during the intelligent height control of the rail vehicle, the vertical shock absorber 4, the anti-roll torsion bar 6, and the central traction device 5 on the body during the adjustment process, a test fixture for simulating the intelligent height control of the body is designed. The test device for simulating the intelligent height control of the train body of the present invention focuses on simulating the train, simulating the fixed unit as the vehicle body, which can not only fix the air spring to be tested, but also is the overall framework of the test device, which can effectively combine the various parts of the device into one, and simulate the structure that may affect the lifting of the air spring. Take it into account, so as to provide a reliable reference for how much internal pressure needs to be added to the air spring for the actual height adjustment of the train. And the two-series suspension device is arranged between the fixed devices, which can effectively simulate various situations such as the transmission and torsion of the train body. The induction device is arranged inside the air spring, which can make it easier to find the test surface, so that the lifting height of the air spring can be fed back more accurately, so as to more accurately test the changes in the lifting and lowering of the entire train body.

[0037] The test method of the test device for simulating intelligent control of train body height of the present embodiment is as follows: a pair of air springs 3 are installed in a fixed unit, and the air intake and exhaust devices are connected. By sensing the height of the air springs 3, the control device controls the opening and closing of the air intake and exhaust devices to adjust the height of the air springs 3; at the same time, the center traction device 5, the anti-roll torsion bar 6, and the vertical shock absorber 4 are driven to adjust the height through the H-type connection 2 frames.

[0038] At the same time, the central traction device or vertical shock absorber and other structures installed on the fixed device can be disassembled according to actual needs, so that the design of test plans under different working conditions can be realized, which is more applicable.

[0039] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments of the present invention without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A test device for simulating intelligent control of train body height, characterized in that: The invention comprises a fixing unit and a test unit, wherein the fixing unit is used to simulate a rail vehicle body, an air spring (3) is installed in the fixing unit, and the fixing unit is installed at the upper and lower ends of the air spring (3) to clamp and fix the air spring (3) to be tested; the test unit comprises a loading device, an air intake and exhaust device (7), a secondary suspension device, a sensing device and a control device; the sensing device is arranged inside the air spring (3), and the height of the air spring (3) is measured by the sensing device and fed back to the control device; the control device controls the switch of the electromagnetic valve of the air intake and exhaust device according to the change of the air spring height measured by the sensing device to realize the inflation and exhaust of the air spring, thereby changing the height of the air spring; considering that the secondary suspension device generates resistance to the fixing unit during the change of the height of the air spring (3), the influence of the secondary suspension device on the internal pressure of the air spring required for height adjustment is detected and studied, so as to provide data reference for actual vehicle body manufacturing.

2. The test device for simulating intelligent control of train body height according to claim 1 is characterized in that: The air springs (3) are arranged in pairs and are disposed on both sides of the fixing unit; the fixing unit comprises an upper clamping device (22) and a lower clamping device (21) disposed at the upper and lower ends of the air spring (3); an H-shaped connecting frame (2) is installed on one side of the upper clamping device (22); an air intake and exhaust device and a secondary suspension device are installed on the H-shaped connecting frame (2) to link the air springs (3) and the test unit on both sides.

3. The test device for simulating intelligent control of train body height according to claim 2 is characterized in that: The loading device comprises an oil cylinder (1) arranged on an H-shaped connecting frame (2), which provides vertical loading for the air spring and simulates vehicles of different specifications by adjusting the loading load.

4. The test device for simulating intelligent control of train body height according to claim 2 is characterized in that: A central traction device (5) is arranged between the paired air springs (3), the central traction device (5) comprising a traction pin seat (51) and traction rods (52) arranged on both sides of the traction pin seat (51), the center of the traction pin seat (51) being fixedly connected to the H-shaped connecting frame (2).

5. The test device for simulating intelligent control of train body height according to claim 2 is characterized in that: The upper clamping device (22) comprises a top plate (221) and a bottom plate (222), and a support body (223) connecting the top plate (221) and the bottom plate (222); a placement cavity is formed between the top plate (221) and the bottom plate (222); the air intake and exhaust device (7) is installed on the top of the air spring (3) through the placement cavity; the lower clamping device (21) comprises a top plate (211) and a bottom plate (212), and a support body (213) connecting the top plate (211) and the bottom plate (212); the top plate (211) and the bottom plate (212) are in contact with and cooperate with the upper and lower ends of the air spring (3) respectively.

6. The test device for simulating intelligent control of train body height according to claim 5, characterized in that: The edge of the top plate 1 (221) is provided with a mounting wing plate 1 (2211) with a protruding edge, and the edge of the bottom plate 2 (212) is provided with a mounting wing plate 2 (2121) with a protruding edge; the mounting wing plate 1 (2211) and the mounting wing plate 2 (2121) are arranged relative to each other and are used to install a vertical shock absorber (4); the stretching direction of the vertical shock absorber (4) is consistent with the height adjustment direction of the air spring (3).

7. The test device for simulating intelligent control of train body height according to claim 5 is characterized in that: The H-shaped connecting frame (2) comprises two parallel side beams (24) and a cross beam (23) connecting the side beams (24) and being perpendicular to the side beams. An anti-roll torsion bar (6) is arranged on one side of the lower clamping device (21). The anti-roll torsion bar (6) comprises a torsion bar shaft (61) extending in the same direction as the side beam (24). Both ends of the torsion bar shaft (61) are provided with symmetrical torsion arms (62). The end of the torsion arm (62) is connected to one end of a vertical connecting rod (8), and the other end of the vertical connecting rod (8) is fixedly connected to the side beam (24).

8. The test device for simulating intelligent control of train body height according to claim 7 is characterized in that: The air spring (3) comprises an airbag (31), an upper cover plate (32) and an airbag cavity enclosed by a pressure plate (33); an auxiliary spring (9) is installed at the lower end of the pressure plate (33); the auxiliary spring (9) comprises a centrally arranged core shaft (91); an inner groove body (92) is arranged at the center of the core shaft (91) close to the pressure plate for installing a displacement sensor (100); an accommodating space (37) is arranged at the center of the core shaft (91) on a side away from the pressure plate (33) to accommodate a signal transmission line (38) of the displacement sensor (100); and a sealing device (200) is arranged circumferentially of the displacement sensor (100).

9. The test device for simulating intelligent control of train body height according to any one of claims 3 to 8, characterized in that: The oil cylinder (1) is provided with a displacement sensor and a force sensor, and in the process of simulating the lifting and lowering of the vehicle body, the displacement and force during the test process can be measured in real time.

10. A test method for a test device simulating intelligent control of train body height, characterized in that: A pair of air springs (3) are installed in a fixed unit and connected to an air intake and exhaust device (7). By sensing the height of the air spring (3), a control device controls the opening and closing of the air intake and exhaust device (7) according to the sensed height, thereby adjusting the air spring to reach a target height; at the same time, the central traction device (5), the anti-roll torsion bar (6), and the vertical shock absorber (4) are adjusted and driven by the H-shaped connecting frame to obtain data on the change in the internal pressure of the air spring (3) caused by the central traction device (5), the anti-roll torsion bar (6), and the vertical shock absorber (4) during the height adjustment process.

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