A rack bogie dynamic performance test bench and test method

Abstract

The present application discloses a test bench and test method for the dynamic performance of a rack bogie, comprising a track simulation unit and a control unit; the track simulation unit comprises a base, a drive motor, an axle, and a pair of track wheels mounted on the axle, the axle also being mounted with a gear, the gear being used to engage with a rack wheel on the bogie, the bogie being fixed by a reaction frame, and the wheel treads on the bogie being located on corresponding track wheels, the control unit being used to control the drive motor to drive the axle to rotate, simulating an infinitely long rack track by the circular motion of the track wheels and gears. The test bench and experimental method simulate an infinitely long rack track by simulating the running state of a rack bogie on a rack track under different speeds and different torque conditions in a test room by driving the axle to rotate, thereby driving the gears and track wheels to rotate, and simulating an infinitely long rack track by the circular motion of the gears and track wheels, thereby simulating the running state of a rack bogie on a rack track under different speeds and different torque conditions in a test room.

Description

Technical Field

[0001] The present application relates to the field of rail transportation technology, and in particular to a rack bogie dynamic performance test bench and test method. Background Art

[0002] Cogwheel trains, which use meshing gears and racks to propel the vehicle forward, are used as sightseeing trains in mountainous areas due to their excellent gradeability. As a core component of cogwheel trains, the bogie drive system provides traction and braking force, while also requiring high-speed operation under varying track conditions. The performance of the bogie drive system is crucial to the safety and comfort of the entire train. Therefore, thorough testing and verification of the cogwheel bogie drive system is crucial.

[0003] Therefore, how to provide a dynamic performance test bench for a rack bogie to simulate the running state of a driven rack bogie under different speeds and vibration conditions is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides a rack bogie dynamic performance test bench, which can simulate the running state of the rack bogie on the rack track under different speeds and different torque conditions in the laboratory.

[0005] The technical solutions provided in this application are as follows:

[0006] A rack bogie dynamic performance test bench, comprising a track simulation unit and a control unit;

[0007] The track simulation unit includes a base, a drive motor, an axle, and a track wheel set mounted on the axle. Both ends of the axle are rotatably mounted on the base. The drive motor is in transmission connection with the axle. A gear is mounted on the axle. The gear is located between the two track wheels of the track wheel set. The gear is used to engage with the rack wheel on the bogie. The bogie is fixed by a reaction frame and the wheel treads on the bogie are located on the corresponding track wheels.

[0008] The control unit is used to control the drive motor to drive the wheel shaft to rotate, so as to simulate an infinitely long rack track by the circular motion of the track wheel and the gear.

[0009] Furthermore, it also includes a vertical actuator and a lateral actuator, wherein the vertical actuator is connected to the upper portion of the bogie through an actuator connection device, and the lateral actuator is connected to the side of the bogie;

[0010] The control unit controls the vertical actuator and the lateral actuator to provide vertical load and lateral load to the bogie respectively, so as to simulate different axle loads and lateral forces applied to the bogie.

[0011] Furthermore, the track simulation unit also includes a vibration excitation device, which is connected to the wheel axle. The control unit controls the vibration excitation device to provide vibration to the wheel axle to simulate different vibration shocks to the wheels of the bogie.

[0012] Furthermore, the excitation device includes a lower mounting seat, an upper mounting seat, a lower iron core, an upper iron core and a side plate, the lower mounting seat is fixed on the base, the lower iron core is fixedly set on the lower mounting seat, the upper iron core is fixedly set on the upper mounting seat, and an air gap is provided between the upper iron core and the lower iron core, an induction coil is provided on the lower iron core, the side plate is set on the lower mounting seat, and the two ends of the upper iron core are movably connected to the side plates respectively.

[0013] Furthermore, it includes an oil tank, the gear is located in the oil tank, and the oil tank is used to fill lubricating oil to lubricate the gear.

[0014] Furthermore, it also includes a gantry, which includes a vertical beam and a horizontal beam, the vertical beam is fixed on the base, the horizontal beam is fixed on the upper part of the vertical beam, the vertical actuator is fixed on the horizontal beam, and the horizontal actuator is fixed on the vertical beam.

[0015] Furthermore, the gears of the track simulation unit adopt a modular design, and the track wheels adopt a modular design.

[0016] A method for testing the dynamic performance of a rack bogie comprises the following steps:

[0017] S1. Provide the above-mentioned rack bogie dynamic performance test bench, and adjust and fix the test bench according to the wheelbase, track width and gear parameters of the rack bogie to be tested;

[0018] S2. Place the bogie on the test bench, so that the rack wheels of the bogie are engaged with the gears of the track simulation unit, the treads of the wheels of the bogie are located on the track wheels, and the bogie is fixed by a reaction frame.

[0019] Alternatively, the bogie is dropped onto the test bench, the rack wheel of the bogie is meshed with the gear of the track simulation unit, the wheel tread of the bogie is located on the corresponding track wheel, and the bogie is fixedly connected to the reaction frame in the longitudinal direction, fixedly connected to the lateral actuator in the transverse direction, and fixedly connected to the vertical actuator through an actuator connection device in the vertical direction;

[0020] S3, controlling the drive motor to drive the wheel shaft to rotate, driving the track wheel and gear to rotate to simulate the rack track;

[0021] and / or, controlling the excitation device to apply excitation to the wheel axle to simulate the unevenness of the track line;

[0022] And / or, controlling a vertical actuator or a lateral actuator to apply a load to the bogie can simulate the vertical or lateral load conditions borne by the bogie.

[0023] Furthermore, in step S3,

[0024] S3-1. The rack wheels of the bogie are operated on the test bench at different speeds, different directions, and different operating times, and a no-load running-in test is performed on the bogie and the test bench;

[0025] S3-2, operating the wheel axle and the rack wheel of the bogie to a certain rotational speed and maintaining it constant, changing the output torque of the rack wheel of the bogie, and performing at least one forward and / or reverse operation under different output torques;

[0026] Alternatively, the torque of the wheel axle and the rack wheel is kept constant, the rotational speed of the rack wheel of the bogie is changed, and at least one forward and / or reverse operation is performed under different rotational speed conditions;

[0027] Alternatively, at rated power, the output torque of the rack wheel of the bogie is changed, and at least one forward and / or reverse operation is performed at different output torques.

[0028] Furthermore, after step S3-1,

[0029] S3-3. Apply a certain vertical load or lateral load to the bogie, and the rack wheel starts from a certain speed, and then gradually accelerates to the maximum speed with a certain speed increment as one gear, and runs for a certain time in each gear;

[0030] Alternatively, the rack wheel is kept at a certain rotational speed, and different vertical loads or lateral loads are applied to the bogie, with a certain load increment as one gear, and the load is gradually increased to the rated load, and each gear is operated for a certain time;

[0031] Alternatively, the rack wheel is kept at a certain rotation speed, the bogie starts with a certain output torque, and then increases step by step to the rated torque with a certain torque increment as a gear, and runs for a certain time in each gear.

[0032] Furthermore, after step S3-1,

[0033] S3-4, starting the electromagnetic excitation device to apply vertical vibration of a certain frequency and amplitude to the wheel shaft, so that the rack wheel runs forward and / or reverse at least once at a certain constant speed;

[0034] Alternatively, the torque of the bogie rack wheel is set to a certain value, the electromagnetic excitation device is started, and vertical vibration of a certain frequency and amplitude is applied to the wheel axle, so that the bogie can perform at least one forward and / or reverse operation under different speed conditions.

[0035] The present invention provides a rack bogie dynamic performance test bench and test method. A control unit controls a drive motor to drive a wheel axle to rotate, thereby driving the gears and track wheels to rotate. The circular motion of the gears and track wheels simulates an infinitely long rack track. The bogie to be tested is placed on the test bench, and the rack wheels on the bogie are meshed with the gears of the track simulation unit. This can achieve the simulation in the laboratory of the running state of the rack bogie on the rack track under different speeds and different torque conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic structural diagram of the rack bogie dynamic performance test bench in Example 1 of the present application;

[0038] Figure 2 This is a side view of the rack bogie dynamic performance test bench in Example 1 of the present application;

[0039] Figure 3 Schematic diagram of the structure of the vibration excitation device in Example 1 of the present application;

[0040] Figure 4 This is a schematic structural diagram of the oil tank of the rack bogie dynamic performance test bench in Example 1 of the present application.

[0041] Illustrations in the specification: base 1, axle 2, track wheel 3, gear 4, bogie 5, rack wheel 51, wheel 52, reaction frame 6, vertical actuator 7, lateral actuator 8, actuator connecting device 9, excitation device 10, lower mounting seat 101, upper mounting seat 102, lower iron core 103, upper iron core 104, induction coil 105, axle seat 106, side plate 107, oil tank 11, gantry 12, crossbeam 121, vertical beam 122. DETAILED DESCRIPTION

[0042] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0043] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0046] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0047] It should be noted that, in this application, “longitudinal” refers to the direction in which the bogie moves; “lateral” refers to the horizontal direction perpendicular to the direction in which the bogie moves; and “vertical” refers to the vertical direction.

[0048] like Figure 1 As shown, this embodiment provides a rack bogie dynamic performance test bench, including a track simulation unit and a control unit;

[0049] The track simulation unit includes a base 1, a drive motor, a wheel axle 2, and a pair of track wheels 3 mounted on the wheel axle 2. Both ends of the wheel axle 2 are rotatably mounted on the base 1. The drive motor is in transmission connection with the wheel axle 2. A gear 4 is further mounted on the wheel axle 2. The gear 4 is located between the two track wheels 3 of the pair of track wheels 3. The gear 4 is used to engage with a rack wheel 51 on a bogie 5. The bogie 5 is fixed by a reaction frame 6, and the treads of the wheels 52 on the bogie 5 are located on the corresponding track wheels 3.

[0050] The control unit is used to control the drive motor to drive the wheel shaft 2 to rotate, and simulate an infinitely long rack track through the circular motion of the track wheel 3 and the gear 4.

[0051] The present embodiment provides a test bench for the dynamic performance of a rack bogie 5, in which two rail wheels 3 are mounted on the axle 2 by means of expansion sleeves, and a gear 4 is mounted on the axle 2 by means of expansion sleeves, and the gear 4 is located between the two rail wheels 3. The rack bogie 5 to be tested is fixed to the test bench by the bogie 5, so that the rack wheel 51 of the bogie 5 is engaged with the gear 4, and the tread of the wheel 52 of the bogie 5 is located on the corresponding rail wheel 3. The radius of the gear 4 of the track simulation unit is preferably larger than the radius of the rack wheel 51. The control unit controls the drive motor to drive the wheel axle 2 to rotate, thereby driving the gear 4 and the rail wheel 3 to rotate. The circular motion of the gear 4 and the rail wheel 3 simulates an infinitely long rack track, thereby simulating the operation of the rack bogie 5 on the rack track under conditions of different operating speeds or different torque sizes in the laboratory.

[0052] This embodiment further optimizes the technical solution and also includes a vertical actuator 7 and a lateral actuator 8. The vertical actuator 7 is connected to the upper part of the bogie 5 through an actuator connecting device 9, and the lateral actuator 8 is connected to the side of the bogie 5; the control unit controls the vertical actuator 7 and the lateral actuator 8 to provide vertical loads and lateral loads to the bogie 5 respectively, so as to simulate different axle loads and lateral forces applied to the bogie 5.

[0053] Specifically, the vertical actuator 7 is connected to the upper part of the bogie 5 through the actuator connecting device 9, and can position the bogie 5 in the vertical direction. The lateral actuator 8 is connected to the side of the bogie 5, and can position the bogie 5 in the laterally. The bogie 5 is fixedly connected to the reaction frame 6 in the longitudinal direction, and the reaction frame 6 is fixed to the ground. The bogie 5 is positioned longitudinally through the reaction frame 6, and the control unit controls the vertical actuator 7 to apply a vertical load to the bogie 5, and controls the lateral actuator 8 to apply a lateral load to the bogie 5, so as to simulate the vertical and lateral loads on the bogie 5, thereby simulating different axle weights and lateral forces applied to the bogie 5, so as to test the operation of the loaded bogie 5.

[0054] To further optimize the above solution, two vertical actuators 7 are provided, which are arranged along the width direction of the bogie 5. In this application, the width direction of the bogie 5 refers to the horizontal direction perpendicular to the direction of travel of the bogie 5, that is, the lateral direction. By arranging two vertical actuators 7 along the width direction of the bogie 5, it is convenient to provide sufficient load to the bogie 5, and it is convenient to adjust the two vertical actuators 7 separately to apply loads of different sizes to the bogie 5. Preferably, there are two lateral actuators 8, and the two lateral actuators 8 are arranged along the width direction of the bogie 5, respectively located on both sides of the bogie 5, and respectively connected to the two sides of the bogie 5. The lateral actuators 8 are controlled by the control unit to apply a lateral load to the bogie 5 to simulate the lateral force condition of the bogie 5.

[0055] This embodiment further describes a track simulation unit, which further includes a vibration excitation device 10. The vibration excitation device 10 is connected to the wheel axle 2. The control unit controls the vibration excitation device 10 to provide vibration to the wheel axle 2 to simulate different vibration impacts to which the wheels 52 of the bogie 5 are subjected. The vibration excitation device 10 preferably uses electromagnetic excitation. The control unit controls the vibration excitation device 10 to provide electromagnetic excitation to the wheel axle 2, and can apply excitations of different vibration frequencies and amplitudes to the wheel axle 2 to simulate vibration conditions on the track line and to simulate different vibration impacts to which the wheels 52 of the bogie 5 are subjected.

[0056] Specifically, the excitation device includes a lower mounting seat 101, an upper mounting seat 102, a lower iron core 103, an upper iron core 104 and a side plate 107. The lower mounting seat 101 is fixed on the base 1, the lower iron core 103 is fixedly set on the lower mounting seat 101, the upper iron core 104 is fixedly set on the upper mounting seat 102, and an air gap is provided between the upper iron core 104 and the lower iron core 103. An induction coil 105 is provided on the lower iron core 103, the side plate 107 is set on the lower mounting seat 101, and the two ends of the upper iron core 104 are respectively movably connected to the side plates 107.

[0057] The lower mounting seat 101 of the excitation device 10 is arranged on the base 1 of the track simulation unit, the lower iron core 103 is installed on the lower mounting seat 101, and the upper iron core 104 is installed on the upper mounting seat 102, and an air gap is provided between the lower iron core 103 and the upper iron core 104, and an induction coil 105 is provided on the lower iron core 103. A side plate 107 is fixed on the lower mounting seat 101, and the two ends of the upper iron core 104 are movably provided on the side plates 107. When the electromagnetic excitation device 10 is working, an alternating current is passed through the induction coil 105, generating an electromagnetic induction force to cause the upper iron core 104 to vibrate up and down, thereby driving the upper mounting seat 102 to vibrate up and down. A wheel axle seat 106 is fixed on the upper mounting seat 102, and the wheel axle 2 is installed on the wheel axle seat 106.

[0058] Preferably, two excitation devices 10 are provided, each connected to the ends of the wheel axle 2 via a bearing. The two excitation devices 10 are located on both sides of the pair of rail wheels 3 and are connected to the wheel axle 2 via a bearing. The control unit controls the excitation devices 10 to apply excitations of different vibration frequencies and amplitudes to the ends of the wheel axle 2 to simulate the vibration conditions on the rack track, thereby performing a dynamic performance test on the rack bogie 5 in the presence of vibration on the track.

[0059] In order to lubricate the rack wheel 51 of the track simulation unit, the test bench also includes a first lubrication system, which includes an oil filling pipe and an oil tank 11. The oil filling pipe is provided on the upper side of the rack wheel 51, and the gear 4 is located in the oil tank 11. The oil tank 11 is used to fill lubricating oil to lubricate the gear 4. Specifically, the oil filling pipe is provided on the upper side of the rack wheel 51 of the bogie 5, and the control unit controls the oil filling pipe to intermittently spray lubricating grease to the meshing position between the rack wheel 51 and the gear 4 for lubrication. The gear 4 is located in the oil tank 11, and the oil tank 11 is filled with a certain amount of lubricating grease. The lower part of the gear 4 is immersed in the oil tank 11, and the gear 4 will be lubricated during the rotation process. The excess lubricating grease sprayed from the oil filling pipe will fall from the gear 4 into the oil tank 11 below, and the lubricating grease can be recovered through the oil tank 11.

[0060] This embodiment describes the installation of the vertical actuator 7 and the lateral actuator 8. The test bench also includes a gantry 12, which includes a vertical beam 122 and a horizontal beam 121. The vertical beam 122 is fixed to the base 1, and the horizontal beam 121 is fixed to the upper part of the vertical beam 122. The vertical actuator 7 is fixed to the horizontal beam 121, and the horizontal actuator 8 is fixed to the vertical beam 122. The gantry 12 is fixed to the base 1 of the track simulation unit through the vertical beam 122, and the gantry 12 is located above the track simulation unit. The two vertical actuators 7 can be specifically in the form of cylinders, one end of the cylinder is fixed to the cross beam 121 of the gantry 12, and the other end is fixed to the actuator connecting device 9. The control unit controls the cylinder to apply a vertical load to the bogie 5 through the actuator connecting device 9, and the control unit can control the size of the load applied by the cylinder to the bogie 5; the two transverse actuators 8 are respectively fixed on the two vertical beams 122 of the gantry 12. The transverse actuator 8 can be in the form of a cylinder, one end of the cylinder is fixed to the vertical beam 122 of the gantry 12, and the other end is connected to the side of the bogie 5. The control unit controls the transverse actuator 8 to apply a transverse load to the bogie 5 to simulate the transverse force condition of the bogie 5.

[0061] To facilitate the removal and replacement of the gears 4 and track wheels 3, the track simulation unit's gears 4 and track wheels 3 are modularly designed. By replacing gears 4 with different numbers of teeth or modules, or by changing the profile of the track wheels 3, track conditions under different wear conditions can be simulated.

[0062] This embodiment also provides a method for testing the dynamic performance of a rack bogie 5, comprising the following steps:

[0063] S1. Provide the above-mentioned dynamic performance test bench for the rack bogie 5, and adjust and fix the test bench according to the wheelbase, track width and gear 4 parameters of the rack bogie 5 to be tested;

[0064] S2. Place the bogie 5 on the test bench, so that the rack wheel 51 of the bogie 5 is engaged with the gear 4 of the track simulation unit, the treads of the wheels 52 of the bogie 5 are located on the track wheels 3, and the bogie 5 is fixed by the reaction frame 6.

[0065] Alternatively, the bogie 5 is dropped onto the test bench, so that the rack wheel 51 of the bogie 5 is engaged with the gear 4 of the track simulation unit, the treads of the wheels 52 of the bogie 5 are located on the corresponding track wheels 3, and the bogie 5 is fixedly connected to the reaction frame 6 in the longitudinal direction, fixedly connected to the lateral actuator 8 in the transverse direction, and fixedly connected to the vertical actuator 7 through the actuator connection device 9 in the vertical direction;

[0066] S3, control the driving motor to drive the wheel shaft 2 to rotate, driving the track wheel 3 and the gear 4 to rotate to simulate the rack track;

[0067] And / or, controlling the vibration excitation device 10 to apply excitation to the wheel axle 2 can simulate the unevenness of the track line;

[0068] And / or, controlling the vertical actuator 7 or the lateral actuator 8 to apply a load to the bogie 5 can simulate the vertical or lateral load conditions borne by the bogie 5.

[0069] The rack bogie 5 to be tested in this embodiment is a single-axle rack bogie 5. The bogie 5's drive system is used to rotate the rack wheel 51. Before the test, grease was added to the first lubrication system to lubricate the rack wheel 51 and gear 4 during the test. The test bench's drive motor was controlled to rotate slowly, while the bogie 5's drive system was simultaneously activated. The uniform and normal rotation was checked, and the rotational speed of the test bench's gear 4 was matched to that of the rack wheel 51. Tests were conducted at various speeds, directions, and durations.

[0070] By inputting different rotational speeds into the track simulation unit's interface through the control unit, the drive motor's action can be controlled, thereby simulating bogie 5 operating at different speeds. By inputting excitations of different vibration frequencies and amplitudes, the excitation device 10 can be controlled to apply electromagnetic excitation to the wheel axle 2, simulating track irregularities. By inputting different pressures, the vertical actuator 7 or the lateral actuator 8 can be controlled to apply different loads to the bogie 5, simulating the load conditions borne by the bogie 5. This test bench can simulate different operating speeds, track irregularities, and different loads. Furthermore, by replacing gears 4 with different parameters such as the number of teeth or module, or by changing the profile of the track wheel 3, track conditions under different wear conditions can be simulated, and the motion of the rack bogie 5 under these conditions can be tested.

[0071] In this embodiment, step S3 specifically includes the following steps:

[0072] S3-1. The rack wheel 51 of the bogie 5 is operated on the test bench at different speeds, different directions, and different operating times, to perform a no-load running-in test on the bogie 5 and the test bench;

[0073] The test bench's axle 2 drives gear 4 at a constant rotational speed. Gear 4 meshes with rack 51 on bogie 5. The radius of gear 4 is larger than that of rack 51, resulting in different rotational speeds. Rack 51 undergoes no-load running-in tests at various speeds, directions, or operating times. The bogie 5 is then operated on the test bench at various speeds for a specific period in both the forward and reverse directions.

[0074] Specifically, the bogie 5 to be tested shall be run on the test bench for a simulated run of not less than 10 hours or a cumulative simulated run of more than 500 km to run in the bogie 5 to be tested. The running speed of the running-in operation shall be evenly distributed between 1 / 3 of the maximum speed of the test and the maximum speed. During the test, wind speeds of not more than 30 m / s and wind speeds of not more than 15 m / s are allowed. 3 / s air volume to cool the test sample.

[0075] S3-2, operating the wheel axle 2 and the rack wheel 51 of the bogie 5 to a certain speed and maintaining it constant, changing the output torque of the rack wheel 51 of the bogie 5, and performing at least one forward and / or reverse operation under different output torques;

[0076] During the test, the output torque of the rack wheel 51 of the bogie 5 was varied at various speeds, including a constant speed of 15 km / h, 75% of the maximum operating speed, the maximum operating speed, and 1.1 times the maximum operating speed. At least one forward run of 10 minutes and a reverse run of 10 minutes were performed under different torque conditions. By running in an overspeed state at 1.1 times the maximum operating speed, the operating smoothness, temperature rise, and sealing performance of the bogie 5's drive and brake system under overspeed conditions were analyzed. The output torque of the rack wheel 51 of the bogie 5 represents the output torque of the bogie 5's drive system.

[0077] Alternatively, the torque of the wheel axle 2 and the rack wheel 51 is kept constant, the rotation speed of the rack wheel 51 of the bogie 5 is changed, and at least one forward and / or reverse operation is performed under different rotation speed conditions;

[0078] Specifically, the torque of the axle 2 and the torque of the rack wheel 51 of the bogie 5 are set to certain values, and the rack wheel 51 of the bogie 5 runs forward for 10 minutes and reverse for 10 minutes at least once under different speed conditions.

[0079] In this embodiment, the following steps are further included after step S3-1:

[0080] S3-3. Apply a certain vertical load or lateral load to the bogie 5. The rack wheel 51 starts from a certain speed and then accelerates step by step to the maximum speed with a certain speed increment as one gear. Each gear runs for a certain time.

[0081] Specifically, in the test, under the condition of 25% rated torque, the bogie 5 starts the test at a speed of 10 km / h, and accelerates step by step to the maximum speed with a speed increment of 10 km / h as one gear, and runs for 10 minutes in each gear.

[0082] Alternatively, the rack wheel 51 is kept at a certain rotation speed, and different vertical loads or lateral loads are applied to the bogie 5, with a certain load increment as one gear and gradually increasing to the rated load, and each gear is operated for a certain time;

[0083] The specific method for applying a load to the bogie 5 via the vertical actuator 7 or the lateral actuator 8 is to apply vertical or lateral loads using force curves with different phases or amplitudes. Specifically, during the test, the bogie 5 was operated at rated speed, and a dynamic load command was input to the vertical actuator 7 or the lateral actuator 8. During the test, the bogie 5 was subjected to dynamic vertical vibration at a frequency of 0 to 5 Hz, with the excitation load being ±30% of the axle load. The bogie 5 was also subjected to dynamic lateral excitation at a frequency of 0 to 5 Hz, with the maximum excitation displacement being 1 / 2 of the lateral stop clearance between the bogie 5 frame and the axle box. Each operating condition was run for 10 minutes.

[0084] Alternatively, the rack wheel 51 is kept at a certain rotation speed, the bogie 5 starts with a certain output torque, and then increases step by step to the rated torque with a certain torque increment as a gear, and runs for a certain time in each gear.

[0085] Specifically, during the test, the rack wheel 51 of the bogie 5 is kept at a rated rotation speed, and the driving system of the bogie 5 starts from 20% of the rated torque, and is loaded step by step to the rated torque with 10% of the rated torque as a gear, and runs for 10 minutes in each gear.

[0086] In this embodiment, the following steps are further included after step S3-1:

[0087] S3-4, starting the electromagnetic excitation device 10 to apply vertical vibration of a certain frequency and amplitude to the wheel shaft 2, so that the rack wheel 51 runs forward and / or reverse at least once at a certain constant speed;

[0088] Specifically, the bogie 5 drive system drives the rack wheel 51 to rotate. When the rack wheel 51 of the test bogie 5 runs to the specified rotation speed, the electromagnetic excitation device 10 of the wheel axle 2 is started to vertically excite the rail wheel 3 at a frequency of 10 to 50 Hz, with an excitation displacement of 0 to 1 mm. The rotation speed of the rack wheel 51 of the bogie 5 is changed, and the bogie 5 is operated for 10 minutes at each rotation speed.

[0089] Alternatively, the torque of the rack wheel 51 of the bogie 5 is set to a certain value, the electromagnetic excitation device 10 is started, and vertical vibration of a certain frequency and amplitude is applied to the wheel axle 2, so that the bogie 5 can perform at least one forward and / or reverse operation under different speed conditions.

[0090] Specifically, when the rack wheel 51 of the tested bogie 5 runs to a specified speed, the bogie 5 drive system outputs a certain torque. After the speed and power are stable, the electromagnetic excitation device 10 of the wheel axle 2 is started to vertically excite the rail wheel 3 at a frequency of 10 to 50 Hz, with an excitation displacement of 0 to 1 mm. The torque of the bogie 5 is changed, and the bogie 5 is operated for 10 minutes under each torque.

[0091] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily 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 application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rack bogie dynamic performance test bench, characterized by: Includes a track simulation unit and a control unit; The track simulation unit includes a base, a drive motor, an axle, and a track wheel set mounted on the axle. Both ends of the axle are rotatably mounted on the base. The drive motor is in transmission connection with the axle. A gear is mounted on the axle. The gear is located between the two track wheels of the track wheel set. The gear is used to engage with the rack wheel on the bogie. The bogie is fixed by a reaction frame and the wheel treads on the bogie are located on the corresponding track wheels. The control unit is used to control the drive motor to drive the wheel shaft to rotate, simulating an infinitely long rack track by the circular motion of the track wheel and the gear; The rack bogie dynamic performance test bench further includes a vertical actuator and a lateral actuator, wherein the vertical actuator is connected to the upper portion of the bogie via an actuator connection device, and the lateral actuator is connected to the side of the bogie; The control unit controls the vertical actuator and the lateral actuator to provide vertical load and lateral load to the bogie respectively, so as to simulate different axle loads and lateral forces applied to the bogie.

2. The rack bogie dynamic performance test bench according to claim 1, characterized in that: The track simulation unit further includes a vibration excitation device, which is connected to the wheel axle. The control unit controls the vibration excitation device to provide vibration to the wheel axle to simulate the impact of different vibrations on the wheels of the bogie.

3. The rack bogie dynamic performance test bench according to claim 2, characterized in that: The excitation device includes a lower mounting seat, an upper mounting seat, a lower iron core, an upper iron core and a side plate. The lower mounting seat is fixed on the base, the lower iron core is fixedly arranged on the lower mounting seat, the upper iron core is fixedly arranged on the upper mounting seat, and an air gap is provided between the upper iron core and the lower iron core. An induction coil is provided on the lower iron core, the side plate is arranged on the lower mounting seat, and both ends of the upper iron core are movably connected to the side plates.

4. The rack bogie dynamic performance test bench according to claim 1, characterized in that: It comprises a first lubrication system, which comprises an oil filling pipe and an oil tank. The oil filling pipe is arranged on the upper side of the rack wheel, and the gear is located in the oil tank.

5. The rack bogie dynamic performance test bench according to claim 1, characterized in that: It also includes a gantry, which includes a vertical beam and a horizontal beam. The vertical beam is fixed on the base, the horizontal beam is fixed on the upper part of the vertical beam, the vertical actuator is fixed on the horizontal beam, and the horizontal actuator is fixed on the vertical beam.

6. The rack bogie dynamic performance test bench according to claim 1, characterized in that: The gears of the track simulation unit adopt a modular design, and the track wheels adopt a modular design.

7. A method for testing the dynamic performance of a rack bogie, characterized in that: The following steps are involved: S1. Provide a rack bogie dynamic performance test bench according to any one of claims 1 to 6, and adjust and fix the test bench according to the wheelbase, track width, and gear parameters of the rack bogie to be tested; S2. Place the bogie on the test bench, engage the rack wheels of the bogie with the gears of the track simulation unit, position the treads of the wheels of the bogie on the track wheels, and fix the bogie by a reaction frame. Alternatively, the bogie is dropped onto the test bench, the rack wheel of the bogie is meshed with the gear of the track simulation unit, the wheel tread of the bogie is located on the corresponding track wheel, and the bogie is fixedly connected to the reaction frame in the longitudinal direction, fixedly connected to the lateral actuator in the transverse direction, and fixedly connected to the vertical actuator through an actuator connection device in the vertical direction; S3, controlling the drive motor to drive the wheel shaft to rotate, driving the track wheel and gear to rotate to simulate the rack track; and / or, controlling the excitation device to apply excitation to the wheel axle to simulate the unevenness of the track line; And / or, controlling a vertical actuator or a lateral actuator to apply a load to the bogie can simulate the vertical or lateral load conditions borne by the bogie.

8. The rack bogie dynamic performance test method according to claim 7, characterized in that: Specifically in step S3, S3-1. The rack wheels of the bogie are operated on the test bench at different speeds, different directions, and different operating times, and a no-load running-in test is performed on the bogie and the test bench; S3-2, operating the wheel axle and the rack wheel of the bogie to a certain rotational speed and maintaining it constant, changing the output torque of the rack wheel of the bogie, and performing at least one forward and / or reverse operation under different output torques; Alternatively, the torque of the wheel axle and the rack wheel is kept constant, the rotational speed of the wheels of the bogie is changed, and at least one forward and / or reverse operation is performed under different rotational speed conditions.

9. The rack bogie dynamic performance test method according to claim 8, characterized in that: After step S3-1, S3-3. Apply a certain vertical load or lateral load to the bogie, and the rack wheel starts from a certain speed, and then gradually accelerates to the maximum speed with a certain speed increment as one gear, and runs for a certain time in each gear; Alternatively, the rack wheel is kept at a certain rotational speed, and different vertical loads or lateral loads are applied to the bogie, with a certain load increment as one gear, and the load is gradually increased to the rated load, and each gear is operated for a certain time; Alternatively, the rack wheel is kept at a certain rotation speed, the bogie starts with a certain output torque, and then increases step by step to the rated torque with a certain torque increment as a gear, and runs for a certain time in each gear.

10. The rack bogie dynamic performance test method according to claim 8, characterized in that: After step S3-1, S3-4, starting the electromagnetic excitation device to apply vertical vibration of a certain frequency and amplitude to the wheel shaft, so that the rack wheel runs forward and / or reverse at least once at a certain constant speed; Alternatively, the torque of the bogie rack wheel is set to a certain value, the electromagnetic excitation device is started, and vertical vibration of a certain frequency and amplitude is applied to the wheel axle, so that the bogie can perform at least one forward and / or reverse operation under different speed conditions.

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