Ballastless track structure intelligent scale test device and method thereof

Abstract

The invention discloses an intelligent scale test device and method for a ballastless track structure, and belongs to the technical field of ballastless track structure tests, and the device comprises a track model, a track structure parameter adjusting system, an excitation system, a data acquisition system and a central control system. The track structure parameter adjusting system and the data acquisition system are arranged on the track model; the excitation system is located above the track model; the track structure parameter adjusting system, the excitation system and the data acquisition system are all connected with the central control system. The device can truly simulate a ballastless track structure, can truly and comprehensively reproduce track structure response conditions of different track structure parameters in a laboratory in cooperation with track structure parameter adjustment, and can automatically perform multiple groups of tests under different parameters in cooperation with a central control system; according to the test method, the vibration conditions of the track structure under different track structure parameters can be truly simulated, and the real track structure parameters on site are identified by using the vibration data.

Description

Technical Field

[0001] The invention belongs to the technical field of ballastless track structure testing, and in particular relates to an intelligent scaled test device and a method for a ballastless track structure. Background Art

[0002] With the rapid development of modern railway transportation, ballastless track occupies an increasingly important position in railway construction with its significant advantages such as high smoothness, high stability and low maintenance. As the key load-bearing structure of the railway line, the accuracy of its structural parameters is directly related to the safe operation and long-term performance of the railway. Therefore, it is very important to efficiently and accurately identify the structural parameters of ballastless track. The current track structure parameter identification methods are roughly divided into two types. One is to establish a track structure finite element model, and adjust the finite element model parameters to make the finite element model calculation acceleration constantly approach the measured vibration acceleration to achieve track structure parameter identification. The other is to calculate a large amount of training data in the set parameter space through the finite element model, and identify the track structure parameters by training the machine learning regression model. The current method has high requirements on the accuracy of the finite element model, and it is difficult to simulate the measurement noise. The data obtained without conducting experiments is not credible. The existing test devices and methods cannot achieve the purpose of changing the track structure parameters at any time like the finite element model. Summary of the invention

[0003] The purpose of the present invention is to provide an intelligent scaled test device and method for ballastless track structure in view of the above-mentioned deficiencies in the prior art, so as to solve the problem that the existing test devices and methods cannot change the track structure parameters at any time.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] In the first aspect, an intelligent scaled test device for ballastless track structure includes a track model, a track structure parameter adjustment system, an excitation system, a data acquisition system and a central control system;

[0006] The track structure parameter adjustment system and the data acquisition system are both arranged on the track model; the track structure parameter adjustment system adjusts the track structure parameters of the track model; the data acquisition system acquires acceleration data of the track model in real time; the excitation system is located above the track model and applies an excitation force to the track model; the track structure parameter adjustment system, the excitation system and the data acquisition system are all connected to the central control system.

[0007] Furthermore, the track model includes a rail, a plurality of fasteners, a track plate, a vibration-damping pad and a base plate;

[0008] The track plate is arranged on the base plate, and the vibration-damping pad is located between the track plate and the base plate; a plurality of fasteners are arranged on the track plate in sequence and at intervals along the length direction of the track; and the rails are fixed on a plurality of the fasteners.

[0009] Furthermore, the track structure parameter adjustment system includes a plurality of fastener parameter adjusters for simulating fasteners, a vibration damping pad parameter adjuster for simulating vibration damping pads, a controller and a power supply; the fastener parameter adjusters and the vibration damping pad parameter adjusters are both connected to the controller; and the controller is connected to an external power supply.

[0010] Furthermore, the fastener parameter regulator and the vibration damping pad parameter regulator are structures with the same structure and different sizes; the fastener parameter regulator and the vibration damping pad parameter regulator both include an upper connecting plate, a lower connecting plate, and a magnetorheological elastomer arranged between the upper connecting plate and the lower connecting plate;

[0011] The upper connecting plate in the fastener parameter adjuster is bonded to the bottom of the rail through silicone rubber, and the lower connecting plate is bonded to the upper surface of the track plate through silicone rubber;

[0012] The upper connecting plate in the vibration damping pad parameter adjuster is bonded to the lower surface of the track plate through silicone rubber, and the lower connecting plate is bonded to the upper surface of the base plate through silicone rubber.

[0013] Furthermore, grooves are reserved on the surface of the magnetorheological elastomer close to the upper connecting plate and the lower connecting plate; a coil is wound in the groove, and the enameled wire of the coil is connected to the controller through a wire lead-out hole opened on the lower connecting plate.

[0014] Furthermore, the excitation system includes two bases, two transverse sliding rods, a limit device, a working platform and a vibration exciter;

[0015] The two bases are symmetrically arranged on both sides of the track model; a pulley is connected under the base, and two vertical sliding bars are fixed above the base; the two corresponding vertical sliding bars on both sides of the track model are connected to the transverse sliding bar through bolt fasteners; the working platform passes through the two transverse sliding bars and is fixed on the transverse sliding bar through a limit device; the vibrator is welded and fixed to the working platform.

[0016] Furthermore, the data acquisition system includes an acceleration sensor and a data acquisition instrument; the acceleration sensor is connected to the data acquisition instrument; and the acceleration sensor is arranged on the upper surface of the rail and the track plate.

[0017] Furthermore, the central control system is respectively connected to the controller in the track structure parameter adjustment system, the exciter in the excitation system, and the data acquisition instrument in the data acquisition system.

[0018] In a second aspect, a test method of a ballastless track structure intelligent scale test device comprises the following steps:

[0019] S1. Before the test begins, a hammer test is performed on the track structure whose structural parameters are to be identified. Based on the excitation force and the acceleration vibration response data of the track structure measurement points, the frequency response function measured on site is calculated:

[0020]

[0021] Among them, H a (ω) is the frequency response function, A(ω) is the Fourier transform of the acceleration response, F(ω) is the Fourier transform of the force excitation, and ω is the angular frequency;

[0022] S2. Produce an intelligent scaled test device for ballastless track structure according to the actual size of the track structure;

[0023] S3. The central control system controls the vibration exciter to provide excitation force, which acts on the excitation point of the ballastless track structure intelligent scale test device that is the same as the on-site test device, collects the vibration response data of the track structure, and then obtains the frequency response function of the track model;

[0024] S4, the central control system adjusts the controller, changes the track parameters to adjust the system current, and uses the optimization algorithm to obtain the optimal track structure parameters:

[0025]

[0026] Among them, SSE is the sum of squared errors, y i is the frequency response function data of the track model, y i It is the frequency response function data measured on site.

[0027] In a third aspect, a test method of a ballastless track structure intelligent scale test device comprises the following steps:

[0028] T1. Produce an intelligent scaled test device for ballastless track structure according to the actual size of the track structure;

[0029] T2. Select an excitation force and an excitation position, set the track structure parameter space of the scaled ballastless track structure test device, and conduct multiple hammer tests with multiple groups of different track structure parameters in the parameter space by controlling the current of the track parameter adjustment system;

[0030] T3. Based on the collected vibration acceleration and excitation force data of the track structure, the frequency response function is calculated, and the frequency response function is used as input and the track structure parameters are used as output to train a machine learning model for track structure parameter identification;

[0031] T4. Calculate the frequency response function based on the excitation force and vibration acceleration data of the on-site rail structure hammer test, and input the frequency response function into the rail structure parameter identification machine learning model to identify the rail structure parameters.

[0032] The ballastless track structure intelligent scaled test device and method provided by the present invention have the following beneficial effects:

[0033] 1. The device of the present invention can truly simulate the ballastless track structure, and cooperate with the adjustment of track structure parameters to truly and comprehensively reproduce the track structure response of different track structure parameters in the laboratory. In conjunction with the central control system, it can automatically carry out multiple groups of tests under different parameters.

[0034] 2. The intelligent scaled test device for ballastless track structure of the present invention has a reasonable structural design, which conforms to the characteristics of the real ballastless track structure. In conjunction with the track structure parameter adjustment system and the excitation system, hammer tests can be performed on various track structure parameters in the laboratory. Then, by collecting vibration data under different track structure parameters and combining them with the vibration dynamics analysis method, the influence standards of different track structure parameters can be established.

[0035] 3. The test method of the present invention can truly simulate the vibration of the track structure under different track structure parameters, and use vibration data to identify the actual track structure parameters on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an overall schematic diagram of an intelligent scaled test device for ballastless track structure of the present invention;

[0037] Figure 2 It is a cross-sectional view of the track structure parameter adjustment system of the present invention;

[0038] Figure 3 It is the internal electric circuit when the track structure parameter adjustment system of the present invention is working;

[0039] Figure 4 It is a schematic diagram of the excitation system of the present invention;

[0040] Figure 5 Schematic diagram of the data acquisition system of the present invention.

[0041] Figure 6 Schematic diagram of the machine learning model structure of the present invention.

[0042] in;

[0043] 1. Track model; 101. Rail; 102. Fastener; 103. Track plate; 104. Vibration-damping pad; 105. Base plate;

[0044] 2. Track structure parameter adjustment system; 201. upper connecting plate; 202. groove; 203. coil; 204. magnetorheological elastomer; 205. lower connecting plate; 206. wire lead-out hole;

[0045] 3. Excitation system; 301. Pulley; 302. Base; 303. Vertical slide bar; 304. Bolt fastener; 305. Horizontal slide bar; 306. Limiting device; 307. Working platform; 308. Vibrator;

[0046] 4. Data acquisition system; 401. Acceleration sensor; 402. Data acquisition instrument. DETAILED DESCRIPTION

[0047] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0048] Example 1

[0049] This embodiment provides an intelligent scaled test device for ballastless track structure. This embodiment can truly simulate the ballastless track structure. By adjusting the track structure parameters, it can truly and comprehensively reproduce the track structure response of different track structure parameters in the laboratory. By cooperating with the central control system, it can automatically perform multiple groups of tests under different parameters. Figure 1 , which specifically include:

[0050] Track model 1, track structure parameter adjustment system 2, excitation system 3, data acquisition system 4 and central control system;

[0051] Among them, the track structure parameter adjustment system 2 and the data acquisition system 4 are both arranged on the track model 1, the track structure parameter adjustment system 2 adjusts the track structure parameters of the track model 1, the data acquisition system 4 collects the acceleration data of the track model 1 in real time, and the excitation system 3 is located above the track model 1 and applies an excitation force to the track model 1; the track structure parameter adjustment system 2, the excitation system 3 and the data acquisition system 4 are all connected to the central control system.

[0052] Specifically, the above structures will be described in detail in the following embodiments;

[0053] Track model 1;

[0054] The track model 1 is scaled down based on the on-site model and is used to simulate the ballastless track structure, which specifically includes rails 101 , fasteners 102 , track plates 103 , vibration-damping pads 104 and base plates 105 .

[0055] Specifically, the track plate 103 is disposed on the base plate 105 , the vibration damping pad 104 is located between the track plate 103 and the base plate 105 , a plurality of fasteners 102 are sequentially arranged on the track plate 103 at intervals along the length direction of the track, and the rails 101 are fixed on the plurality of fasteners 102 .

[0056] Track structure parameter adjustment system 2;

[0057] The track structure parameter adjustment system 2 is used to adjust the stiffness and damping parameters of the fasteners 102 and the vibration-damping pads 104 in the track model 1, and includes a fastener parameter adjuster, a vibration-damping pad parameter adjuster, a controller and a power supply.

[0058] The fastener parameter regulator is used to simulate the fastener 102, and the vibration damping pad parameter regulator is used to simulate the vibration damping pad 104. The fastener parameter regulator and the vibration damping pad parameter regulator are both connected to the controller, and the controller is connected to an external power supply.

[0059] The fastener parameter adjuster and the vibration damping pad parameter adjuster of this embodiment have the same structure but different sizes; the fastener parameter adjuster and the vibration damping pad parameter adjuster both include an upper connecting plate 201, a lower connecting plate 205, and a magnetorheological elastomer 204 arranged between the upper connecting plate 201 and the lower connecting plate 205.

[0060] refer to Figure 2 For the fastener parameter regulator, the upper connecting plate 201 is bonded to the bottom of the rail 101 through silicone rubber, the middle layer of magnetorheological elastomer 204 is bonded between the upper connecting plate 201 and the lower connecting plate 205 through silicone rubber, and the lower connecting plate 205 is bonded to the upper surface of the track plate 103 through silicone rubber.

[0061] refer to Figure 2 For the vibration damping pad parameter regulator, the upper connecting plate 201 is bonded to the lower surface of the track plate 103 through silicone rubber, the middle layer of magnetorheological elastomer 204 is bonded between the upper connecting plate 201 and the lower connecting plate 205 through silicone rubber, and the lower connecting plate 205 is bonded to the upper surface of the base plate 105 through silicone rubber.

[0062] As a preferred embodiment of this embodiment, refer to Figure 2 A groove 202 is reserved on the surface of the magnetorheological elastomer 204 near the upper connecting plate 201 and the lower connecting plate 205, and a coil 203 is wound in the groove 202. The coil 203 is regularly wound with a certain gap. The enameled wire of the coil 203 is connected to the controller through a wire lead-out hole 206 opened on the lower connecting plate 205.

[0063] As a preferred embodiment of the present invention, the upper connecting plate 201 and the lower connecting plate 205 are made of epoxy glass fiber board material; the magnetorheological elastomer 204 is made of carbonyl iron powder, silicone rubber and dimethyl silicone oil in a certain proportion under magnetic field conditions.

[0064] When doing specific work, refer to Figure 2 and Figure 3 , the enameled wire of the coil 203 is connected to the controller through the wire lead-out hole 206, and the controller is connected to an external power supply; the controller is simultaneously connected to a plurality of fastener parameter regulators and vibration damping pad parameter regulators, and is used to control the current of each fastener parameter regulator and vibration damping pad parameter regulator. When the current in the coil 203 changes, the stiffness and damping of the magnetorheological elastomer 204 change accordingly, thereby changing the stiffness and damping parameters of the fastener 102 and the vibration damping pad 104. Through experiments, the quantitative relationship between the current size of the coil 203 and the specific numbers of the stiffness and damping of the fastener 102 and the vibration damping pad 104 is obtained.

[0065] Motivational system 3;

[0066] The excitation system 3 is used to select any point of the track structure as an excitation point and apply an excitation force. It includes a pulley 301, a base 302, a vertical slide bar 303, a bolt fastener 304, a horizontal slide bar 305, a limit device 306, a working platform 307 and an exciter 308.

[0067] refer to Figure 4 The two bases 302 are symmetrically arranged on both sides of the track model 1, a pulley 301 is connected under the base 302, and two vertical sliding bars 303 are fixed above the base 302; the two corresponding vertical sliding bars 303 on both sides of the track model 1 are connected to the horizontal sliding bar 305 through bolt fixers 304, the working platform 307 passes through the two horizontal sliding bars 305, and is fixed on the horizontal sliding bar through a limit device 306, and the exciter 308 is welded and fixed on the working platform 307.

[0068] Data acquisition system 4;

[0069] refer to Figure 5 The data acquisition system 4 is used to obtain the mechanical state and acceleration data of the track model 1, and includes an acceleration sensor 401 and a collector 402; the acceleration sensor 401 is connected to the collector 402, and the acceleration sensor 401 is arranged on the upper surface of the rail 101 and the track plate 103 for collecting acceleration data.

[0070] Central control system;

[0071] It is respectively connected to the controller in the track structure parameter adjustment system 2, the exciter 308 in the excitation system 3, and the data acquisition instrument 402 in the data acquisition system 4; the central control system realizes variable parameters of the track model 1 and automatic multiple cycles of hammer tests by regulating these three instruments, so as to identify the track structure parameters.

[0072] Example 2

[0073] This embodiment is based on Embodiment 1 and provides a ballastless track structure intelligent scale test method, which specifically includes the following steps:

[0074] Step S1: Before the test begins, a hammer test is performed on the track structure whose structural parameters are to be identified. Based on the excitation force and the acceleration vibration response data of the track structure measuring points, the frequency response function measured on site is calculated:

[0075]

[0076] Among them, H a (ω) is the frequency response function, A(ω) is the Fourier transform of the acceleration response, F(ω) is the Fourier transform of the force excitation, and ω is the angular frequency.

[0077] Step S2, manufacturing an intelligent scaled test device for ballastless track structure according to the actual size of the track structure;

[0078] Step S3, the central control system controls the vibration exciter 308 to provide an excitation force, which acts on the excitation point of the ballastless track structure intelligent scaled test device that is the same as the on-site one, operates the pulley 301, the vertical slide bar 303, and the horizontal slide bar 305 in the excitation system 3, and places the working platform 307 at the excitation position; collects the vibration response data of the track structure, and then obtains the frequency response function of the track model 1;

[0079] Step S4: The central control system adjusts the controller, changes the track parameters to adjust the system current, and uses an optimization algorithm to obtain the optimal track structure parameters:

[0080]

[0081] Among them, SSE is the sum of squared errors, y i is the frequency response function data of track model 1, y i It is the frequency response function data measured on site.

[0082] The optimization algorithm of this embodiment selects the particle swarm optimization algorithm to find the optimal parameter combination within the parameter value range of Table 1.

[0083] Example 3

[0084] This embodiment is based on Embodiment 1 and provides a ballastless track structure intelligent scale test method, which specifically includes the following steps:

[0085] Step T1, manufacturing an intelligent scaled test device for ballastless track structure according to the actual size of the track structure;

[0086] The quantitative relationship between the current of the coil 203 and the specific figures of the stiffness and damping of the fastener 102 and the vibration-damping pad 104 is obtained through experiments, which is specifically:

[0087] k1=f1(A1)

[0088] c1=g1(A1)

[0089] k2=f2(A2)

[0090] c2=g2(A2)

[0091] Among them, k1 and c1 are the stiffness and damping of the fastener 102, k2 and c2 are the stiffness and damping of the vibration damping pad 104, A1 and A2 are the current magnitudes of the fastener parameter regulator and the vibration damping pad parameter regulator coil 203, f1 and f2 are the relationship functions between the stiffness and current of the fastener and the vibration damping pad, respectively; g1 and g2 are the relationship functions between the fastener and the vibration damping pad and the damping, respectively.

[0092] Step T2: Select an excitation force and an excitation position, set the track structure parameter space of the scaled ballastless track structure test device, and perform multiple hammer tests with multiple groups of different track structure parameters in the parameter space by controlling the current of the track parameter adjustment system; the specific parameter space is shown in the following table

[0093] Table 1 Parameter value range

[0094]

[0095] Step T3, Reference Figure 5 , based on the collected vibration acceleration and excitation force data of the track structure, the frequency response function is calculated, and the frequency response function is used as input and the track structure parameters are used as output to train a machine learning model for identifying track structure parameters;

[0096] Among them, the frequency response function of the vibration acceleration data is calculated;

[0097]

[0098] Among them, H a (ω) is the frequency response function, A(ω) is the Fourier transform of the acceleration response, F(ω) is the Fourier transform of the force excitation, and ω is the angular frequency.

[0099] The machine learning of this embodiment can directly adopt existing mature technologies, so the specific process of machine learning will not be described in detail.

[0100] Step T4: Calculate the frequency response function based on the excitation force and vibration acceleration data of the on-site track structure hammer test, and input the frequency response function into the track structure parameter identification machine learning model to identify the track structure parameters.

[0101] Although the specific implementation of the invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. An intelligent scaled test device for ballastless track structure, characterized in that: It includes track model, track structure parameter adjustment system, excitation system, data acquisition system and central control system; The track structure parameter adjustment system and the data acquisition system are both arranged on the track model; the track structure parameter adjustment system adjusts the track structure parameters of the track model; the data acquisition system collects acceleration data of the track model in real time; the excitation system is located above the track model and applies an excitation force to the track model; The track structure parameter adjustment system, the excitation system and the data acquisition system are all connected to the central control system.

2. The intelligent scaled test device for ballastless track structure according to claim 1 is characterized in that: The track model includes a steel rail, a plurality of fasteners, a track plate, a vibration-damping pad and a base plate; The track plate is arranged on the base plate, and the vibration-damping pad is located between the track plate and the base plate; a plurality of fasteners are arranged on the track plate in sequence and at intervals along the length direction of the track; and the rails are fixed on a plurality of the fasteners.

3. The intelligent scaled test device for ballastless track structure according to claim 1 is characterized in that: The track structure parameter adjustment system includes a plurality of fastener parameter adjusters for simulating fasteners, a vibration damping pad parameter adjuster for simulating vibration damping pads, a controller and a power supply; the fastener parameter adjusters and the vibration damping pad parameter adjusters are both connected to the controller; and the controller is connected to an external power supply.

4. The intelligent scaled test device for ballastless track structure according to claim 3 is characterized in that: The fastener parameter regulator and the vibration damping pad parameter regulator are structures with the same structure but different sizes; the fastener parameter regulator and the vibration damping pad parameter regulator each include an upper connecting plate, a lower connecting plate, and a magnetorheological elastomer disposed between the upper connecting plate and the lower connecting plate; The upper connecting plate in the fastener parameter adjuster is bonded to the bottom of the rail through silicone rubber, and the lower connecting plate is bonded to the upper surface of the track plate through silicone rubber; The upper connecting plate in the vibration damping pad parameter adjuster is bonded to the lower surface of the track plate through silicone rubber, and the lower connecting plate is bonded to the upper surface of the base plate through silicone rubber.

5. The intelligent scaled test device for ballastless track structure according to claim 4 is characterized in that: A groove is reserved on the surface of the magnetorheological elastomer close to the upper connecting plate and the lower connecting plate; a coil is wound in the groove, and the enameled wire of the coil is connected to the controller through a wire lead-out hole opened on the lower connecting plate.

6. The intelligent scaled test device for ballastless track structure according to claim 1 is characterized in that: The excitation system includes two bases, two transverse sliding rods, a limit device, a working platform and a vibration exciter; The two bases are symmetrically arranged on both sides of the track model; a pulley is connected under the base, and two vertical sliding bars are fixed above the base; the two corresponding vertical sliding bars on both sides of the track model are connected to the transverse sliding bar through bolt fasteners; the working platform passes through the two transverse sliding bars and is fixed on the transverse sliding bar through a limit device; the vibrator is welded and fixed to the working platform.

7. The intelligent scaled test device for ballastless track structure according to claim 1 is characterized in that: The data acquisition system comprises an acceleration sensor and a data acquisition instrument; the acceleration sensor is connected to the data acquisition instrument; the acceleration sensor is arranged on the upper surface of the rail and the track plate.

8. The intelligent scaled test device for ballastless track structure according to claim 1 is characterized in that: The central control system is respectively connected to the controller in the track structure parameter adjustment system, the vibration exciter in the excitation system, and the data acquisition instrument in the data acquisition system.

9. A test method for the intelligent scaled test device for ballastless track structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Before the test begins, a hammer test is performed on the track structure whose structural parameters are to be identified. Based on the excitation force and the acceleration vibration response data of the track structure measurement points, the frequency response function measured on site is calculated: Among them, H a (ω) is the frequency response function, A(ω) is the Fourier transform of the acceleration response, F(ω) is the Fourier transform of the force excitation, and ω is the angular frequency; S2. Produce an intelligent scaled test device for ballastless track structure according to the actual size of the track structure; S3. The central control system controls the vibration exciter to provide excitation force, which acts on the excitation point of the ballastless track structure intelligent scale test device that is the same as the on-site test device, collects the vibration response data of the track structure, and then obtains the frequency response function of the track model; S4, the central control system adjusts the controller, changes the track parameters to adjust the system current, and uses the optimization algorithm to obtain the optimal track structure parameters: Among them, SSE is the sum of squared errors, y i is the frequency response function data of the track model, y i It is the frequency response function data measured on site.

10. A test method of the intelligent scaled test device for ballastless track structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: T1. Produce an intelligent scaled test device for ballastless track structure according to the actual size of the track structure; T2. Select an excitation force and an excitation position, set the track structure parameter space of the scaled ballastless track structure test device, and conduct multiple hammer tests with multiple groups of different track structure parameters in the parameter space by controlling the current of the track parameter adjustment system; T3. Based on the collected vibration acceleration and excitation force data of the track structure, the frequency response function is calculated, and the frequency response function is used as input and the track structure parameters are used as output to train a machine learning model for track structure parameter identification; T4. Calculate the frequency response function based on the excitation force and vibration acceleration data of the on-site track structure hammer test, and input the frequency response function into the track structure parameter identification machine learning model to identify the track structure parameters.

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