CN114441285B - Power test device and method for simulating train load - Google Patents
Power test device and method for simulating train load Download PDFInfo
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- CN114441285B CN114441285B CN202210118814.XA CN202210118814A CN114441285B CN 114441285 B CN114441285 B CN 114441285B CN 202210118814 A CN202210118814 A CN 202210118814A CN 114441285 B CN114441285 B CN 114441285B
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Abstract
The invention provides a power test device and a method for simulating train load, and relates to the technical field of roadbed engineering. The device provided by the invention comprises a power module, a counterweight module, a limiting module, a data acquisition module and a roadbed, wherein the power module comprises a vibration exciter and a frequency converter, the vibration exciter is arranged on the counterweight module, the frequency converter is connected with the vibration exciter through a first wire, the limiting module and the data acquisition module are respectively connected with the counterweight module, and the limiting module is fixed on the roadbed; the device provided by the invention is of a modularized structure, so that the device is convenient to disassemble and assemble and easy to replace, the test efficiency can be improved, and the test cost can be reduced. The invention also provides a dynamic test method for simulating the train load, which can avoid the phenomenon that the biaxial rotation of the vibration exciter is asynchronous under the low-frequency condition, and also improves the accuracy of vibration exciting force output.
Description
Technical Field
The invention relates to the technical field of roadbed engineering, in particular to a power test device and method for simulating train load.
Background
Railway foundations are important foundation structures for directly carrying a track system formed by filling or excavation, and bear the weight of a track superstructure, namely static load, and the dynamic load transmitted by the running of a train through the track. The power generated during the running of the train is transmitted to the roadbed through the track structure, so that the roadbed is caused to respond in power, and the roadbed is caused to be deformed in elastoplastic mode. The large deformation of the roadbed has an important effect on the geometric shape and position of the track structure and further reduces the running quality of the train. The device for simulating the power action of the train is used for carrying out dynamic response test of the roadbed, obtaining relevant dynamic response parameters of the roadbed, evaluating the dynamic performance of the roadbed and ensuring the safe operation of the railway.
The device for simulating the dynamic action of the load of the train on the roadbed generally adopts a vibration excitation device with a double-shaft inertia vibration exciter as the dynamic force, and the vibration excitation device generates the vibration excitation force with the vertical sine function change under the action of the double-shaft vibration exciter. However, the device is inconvenient to disassemble and assemble, and is very troublesome in replacement, so that the test efficiency is low, and the test cost is wasted; in addition, the exciting force of the inertial type exciter is mostly calculated and obtained according to the theoretical relation between the exciting force, the vibration frequency and the mass of the eccentric block, but through calibration experiments, the exciting force has different degrees of deviation from the theoretical law along with the change of the vibration frequency, when the vibration frequency is lower, the double-shaft rotation of the exciter has an asynchronous phenomenon, and when the vibration frequency is higher, the peak value and the valley value of the exciting force have larger deviation from the static balance position, so that the accuracy of the output of the exciting force is reduced. Therefore, the invention provides a power test device and a method for simulating the load of a train to solve the problems.
Disclosure of Invention
The invention aims to provide a power test device for simulating train load, which is of a modularized structure, so that the device is convenient to disassemble and assemble and easy to replace, the test efficiency can be improved, and the test cost can be reduced.
The invention further aims to provide a dynamic test method for simulating the load of the train, which can avoid the asynchronous phenomenon of the biaxial rotation of the vibration exciter under the low-frequency condition, can also avoid the larger fluctuation of the vibration exciting force output under the high-frequency condition, and improves the accuracy of the vibration exciting force output.
The technical scheme of the invention is as follows:
in a first aspect, the application provides a power test device for simulating a train load, which comprises a power module, a counterweight module, a limiting module, a data acquisition module and a roadbed, wherein the power module comprises a vibration exciter and a frequency converter, the vibration exciter is arranged on the counterweight module, the frequency converter is connected with the vibration exciter through a first wire, the limiting module and the data acquisition module are respectively connected with the counterweight module, and the limiting module is fixed on the roadbed.
Further, the vibration exciter comprises a rotating shaft, and a lamination type eccentric block is arranged on the rotating shaft.
Further, the counterweight module comprises an inner frame, a counterweight block arranged in the inner frame and a rigid loading plate arranged on a bottom plate of the inner frame, and the vibration exciter is arranged on a top plate of the inner frame.
Further, the limiting module comprises an outer frame and a limiting pulley fixed on the outer frame, the limiting pulley is abutted with the inner frame, and the outer frame is anchored on the roadbed through ground.
Further, the data acquisition module comprises a data acquisition device and a vibration displacement meter, the data acquisition device comprises a data acquisition instrument and a computer, the data acquisition instrument is connected with the vibration displacement meter through a second wire, and the vibration displacement meter is fixed at the central position of the upper surface of the bottom plate of the inner frame.
In a second aspect, the present application provides a power test method for simulating a train load, comprising the steps of:
s1, setting a horizontal test roadbed surface by taking the device for simulating the train load power test as a test model, and installing an excitation device on a roadbed;
s2, setting parameters of an excitation device, and installing an eccentric block and a balancing weight;
s3, starting an excitation device to act on a test roadbed surface to generate a simulated train load, and determining the roadbed dynamic stiffness of a site test position according to each parameter;
s4, analyzing test results according to dynamic stiffness of the roadbed.
Further, the step S2 includes:
s21, calibrating values of vibration pressure and valley pressure of a simulation test, selecting the number of eccentric block groups of the vibration exciter, and installing the eccentric block groups on the vibration exciter;
s22, determining the output frequency of the excitation device according to the vibration pressure;
s23, determining static balance pressure according to the output frequency and the valley pressure;
s24, installing the balancing weight by utilizing static balance pressure.
Further, the step S3 includes:
s31, starting an excitation device, and adjusting a frequency converter according to output frequency to enable the frequency converter to act on a test road surface, so that the excitation device generates train load with sine function change;
s32, carrying out repeated cyclic loading, obtaining dynamic deformation values of repeated cyclic loading after vibration displacement is stable, and calculating an average value of the dynamic deformation values;
s33, determining the dynamic stiffness of the roadbed at the site test position according to the average value.
Compared with the prior art, the invention has at least the following advantages or beneficial effects:
1. the invention provides a power test device for simulating train load, which is of a modularized structure, so that the device is convenient to disassemble and assemble and easy to replace, the test efficiency is improved, and the test cost is reduced;
2. the regression equation of the vibration pressure and the valley pressure of the vibration excitation device along with the output frequency and the eccentric mass changes, the system deviation that the peak pressure and the valley pressure determined by a theoretical method are symmetrically distributed on two sides of the static balance pressure is corrected, and the accuracy of vibration excitation force output is improved.
3. The dynamic test method for simulating the train load provided by the invention has the advantages that a reasonable working frequency range is defined, the phenomenon of asynchronism of double-shaft rotation of the vibration exciter under the low-frequency condition can be well avoided, the larger fluctuation of the vibration exciting force output under the over-high-frequency condition can be avoided, and the accuracy of the vibration exciting force output is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a power test device for simulating train load according to an embodiment of the present invention;
FIG. 2 is a top view of a power test device for simulating train load according to an embodiment of the present invention;
FIG. 3 is a step diagram of a power test method for simulating train load according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a simulated power action time course of a power test device for simulating a train load according to an embodiment of the present invention.
Icon: 1. a power module; 101. a vibration exciter; 101a, a rotating shaft; 101b, eccentric blocks; 102. a frequency converter; 103. a first wire; 2. a counterweight module; 201. an inner frame; 201a, a top plate; 201b, a bottom plate; 202. balancing weight; 203. a rigid load plate; 3. a limit module; 301. an outer frame; 302. a limit pulley; 303. an earth anchor; 4. a data acquisition module; 401. a data acquisition device; 401a, a data acquisition instrument; 401b, a computer; 402. a vibrating displacement meter; 403. and a second wire.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
It should be noted that, in this document, the term "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The various embodiments and features of the embodiments described below may be combined with one another without conflict.
Examples
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a power test device for simulating a train load according to an embodiment of the present application; fig. 2 is a plan view of a power test device for simulating a train load according to an embodiment of the present invention.
The application provides a power test device for simulating train load, which comprises a power module 1, a counterweight module 2, a limiting module 3, a data acquisition module 4 and a roadbed.
The power module 1 comprises a vibration exciter 101 and a frequency converter 102, the vibration exciter 101 is arranged on the counterweight module 2, the frequency converter 102 is connected with the vibration exciter 101 through a first wire 103, the limiting module 3 and the data acquisition module 4 are respectively connected with the counterweight module 2, and the limiting module 3 is fixed on a roadbed.
Wherein the output frequency of the exciter 101 can be changed by adjusting the frequency converter 102.
As a preferred embodiment, the vibration exciter 101 includes a rotary shaft 101a, and a lamination type eccentric mass 101b is provided on the rotary shaft 101 a.
Wherein, the relation between the exciting force and the vibration frequency of the exciting device can be adjusted by increasing or decreasing the number of groups of eccentric blocks 101 b; typically, each set of eccentric masses 101b consists of 4 laminations, with a mass of 3.556kg and an eccentricity of 0.046m for each set of eccentric masses 101b being preferred in this embodiment.
As a preferred embodiment, the counterweight module 2 includes an inner frame 201, a counterweight 202 provided in the inner frame 201, and a rigid loading plate 203 provided on a bottom plate 201b of the inner frame 201, and the vibration exciter 101 is provided on a top plate 201a of the inner frame 201.
The vibration mass of the vibration excitation device can be changed by increasing or decreasing the mass of the balancing weight 202, and the vibration mass consists of the mass of the vibration exciter 101 and the mass of the balancing weight module 2 in the power module 1; the rigid load plate 203 in this embodiment is preferably a load plate 300mm in diameter and 25mm thick.
As a preferred embodiment, the limit module 3 includes an outer frame 301 and a limit pulley 302 fixed to the outer frame 301, the limit pulley 302 abuts against the inner frame 201, and the outer frame 301 is fixed to the roadbed by an earth anchor 303.
As a preferred embodiment, the data acquisition module 4 includes a data acquisition device 401 and a vibration displacement meter 402, the data acquisition device 401 includes a data acquisition instrument 401a and a computer 401b, the data acquisition instrument 401a is connected with the vibration displacement meter 402 through a second wire 403, and the vibration displacement meter 402 is fixed at a central position of the upper surface of the base plate 201 b.
Referring to fig. 3, fig. 3 is a step diagram of a power test method for simulating a train load according to an embodiment of the present invention.
The application provides a power test method for simulating train load, which comprises the following steps:
s1, setting a horizontal test roadbed surface by taking a device for simulating a train load power test as a test model, and installing an excitation device on a roadbed;
s2, setting parameters of an excitation device, and installing an eccentric block 101b and a balancing weight 202;
s3, starting an excitation device to act on a test roadbed surface to generate a simulated train load, and determining the roadbed dynamic stiffness of a site test position according to each parameter;
s4, analyzing test results according to dynamic stiffness of the roadbed.
The vibration excitation device comprises a power module 1, a counterweight module 2 and a limiting module 3.
As a preferred embodiment, step S2 includes:
s21, calibrating vibration pressure sigma of simulation test pv Sum valley pressure sigma v Selecting the number i of the eccentric blocks 101b of the vibration exciter 101 and installing the eccentric blocks on the vibration exciter 101;
s22, according to the vibration pressure sigma pv Determining the output frequency f of the excitation device;
s23, according to the output frequency f and the valley pressure sigma v Determining static equilibrium pressure sigma 0 ；
S24, utilizing static balance pressure sigma 0 The area A of the rigid loading plate 203 and the balancing weight 202 are uniformly arranged in the inner frame 201, so that the vibration mass m of the vibration excitation device z ＝σ 0 A/g; wherein g is gravitational acceleration.
Wherein, when the group number i of the eccentric block 101b is=1, the vibration pressure sigma of the simulation test is calibrated pv ＝0.016f 3.066 Valley pressure sigma v ＝σ 0 -0.068f 2.181 The method comprises the steps of carrying out a first treatment on the surface of the When the group number i=2 of the eccentric mass 101b, the vibration pressure σ of the simulation test is calibrated pv ＝0.070f 2.804 Valley pressure sigma v ＝σ 0 -0.086f 2.412 。
The vibration exciter 101 is a biaxial vibration exciter 101, and after the number i of groups of eccentric blocks 101b is selected, the eccentric blocks 101b are mounted on the rotating shafts at both ends of the biaxial vibration exciter 101.
Referring to fig. 4, fig. 4 is a schematic diagram of a simulated power action time course of a power test device for simulating a train load according to an embodiment of the present invention.
As a preferred embodiment, step S3 includes:
s31, starting an excitation device, and adjusting the frequency converter 102 according to the output frequency f to enable the frequency converter to act on a test road surface, so that the excitation device generates train load with sine function change;
s32, carrying out repeated cyclic loading, obtaining dynamic deformation values of repeated cyclic loading after vibration displacement is stable, and calculating an average value of the dynamic deformation values;
s33, determining the dynamic stiffness of the roadbed at the site test position according to the average value.
In step S31, the frequency converter 102 is adjusted according to the output frequency f to act on the test road surface, so that the excitation device generates a sine function to change the train load, the change chart is shown in fig. 4, and a simulated power action time course curve and vibration pressure sigma are formed pv And fluctuates up and down with time.
In step S32, the number of times of cyclic loading is 1000 in the present embodiment, and then the data acquisition device 401 is used to obtain the dynamic deformation time course curve of the roadbed, and the dynamic deformation value S of 100 cyclic loading after stable vibration displacement is obtained i The mean value s is calculated as follows:
in step S33, the calculation formula for determining the dynamic stiffness of the roadbed at the site test site based on the average value is K d ＝σ pv S, S is the dynamic deformation value S of 100 times of cyclic loading after the vibration displacement is stabilized in the step S32 i Average value of (2).
Working principle:
leveling a test road surface of a field, removing floating soil, and ensuring the level of the test road surface; connecting a rigid loading plate 203 in a counterweight module 2 with a bottom plate 201b of an inner frame 201, placing the connected inner frame 201 and rigid loading plate 203 on a test roadbed surface, ensuring that the loading plate 203 is completely contacted with the test roadbed surface, installing a limit module 3 outside the inner frame 201 and the rigid loading plate 203, fixing an outer frame 301 of the limit module 3 on a roadbed through a ground anchor 303, adjusting a limit pulley 302 to abut against the inner frame 201, fixing an exciter 101 on a top plate 201a of the inner frame 201, connecting the exciter 101 with a frequency converter 102 through a first lead 103, fixing a vibration displacement meter 402 on the center of the upper surface of the bottom plate 201b of the inner frame 201, and connecting the vibration displacement meter 402 with a data acquisition meter 401a through a second lead 403;
test (1): determining simulated vibration pressure sigma pv =100 kPa, valley pressure σ v ＝18kPa。
SelectingThe eccentric blocks 101b have a group number i=1, 4 laminations are arranged on the rotating shafts at two ends of the double-shaft vibration exciter according to the vibration pressure sigma pv =100 kPa substituted into the formula σ obtained by calibration test pv ＝0.016f 3.066 The output frequency f=17.3 Hz is determined, and the valley pressure sigma is determined according to the output frequency f=17.3 Hz v =18 kPa, formula σ obtained from calibration test v ＝σ 0 -0.068f 2.181 Obtain static balance pressure sigma 0 =52.1 kPa, represented by the formula σ 0 ＝m z Determination of the vibration Mass m by g/A z 375.6kg, uniformly installing weights 202 in the inner frame 201 to make the vibration mass m of the vibration exciter z 375.6kg, adjusting the frequency converter to obtain vibration pressure sigma at vibration output frequency f=17.3 Hz pv =100 kPa, valley pressure σ v The dynamic action of sine function change of 18kPa is adopted to carry out 1000 times of cyclic loading on a test roadbed, a data acquisition device 401 is utilized to obtain a roadbed dynamic deformation time course curve, and a dynamic deformation average value s of 100 times of cyclic loading after vibration displacement is stable is obtained 1 mm, thereby obtaining the dynamic stiffness K of the roadbed at the site test position d ＝σ pv /s 1 ＝100/s 1 kPa/mm。
Test (2): determining vibration pressure sigma to be simulated according to test requirements pv =100 kPa, valley pressure σ v ＝18kPa；
Selecting the number i=2 of eccentric blocks 101b, mounting 2×4 laminations on the rotating shafts at two ends of the double-shaft vibration exciter, and according to the vibration pressure sigma pv =100 kPa substituted into the formula σ obtained by calibration test pv ＝0.070f 2.804 The output frequency f=13.3 Hz is determined. According to the output frequency f=13.3 Hz, the valley pressure sigma v =18 kPa, formula σ obtained from calibration test v ＝σ 0 -0.086f 2.412 Obtain static equilibrium stress sigma 0 =62.2 kPa, represented by the formula σ 0 ＝m z Determination of the vibration Mass m by g/A z 448.3kg, uniformly installing weights 202 in the inner frame 201 to make the vibration mass m of the vibration exciter z 448.3kg, adjusting the frequency converter to obtain vibration pressure sigma at vibration output frequency f=13.3hz pv =100 kPa, valley pressure σ v Sine of =18 kPaThe dynamic action of function change carries out 1000 times of cyclic loading on the test roadbed, the data acquisition device 401 is utilized to acquire the roadbed dynamic deformation time course curve, and the dynamic deformation average value s of 100 times of cyclic loading after vibration displacement is stable is acquired 2 mm, the dynamic stiffness K of the roadbed at the site test position can be obtained d ＝σ pv /s 2 ＝100/s 2 kPa/mm。
It should be noted that calibration is to determine some values in the test to perform the correlation calculation.
And processing and analyzing according to the test data to obtain a test result.
It will be appreciated that the configuration shown in the figures is illustrative only and that a power test apparatus and method for simulating train loading may include more or fewer components than shown in the figures or have a different configuration than shown in the figures. The components shown in the figures may be implemented in hardware, software, or a combination thereof.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus or method may be implemented in other manners as well.
The above-described embodiments are merely illustrative, for example, of the flowcharts or block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In summary, the device comprises a power module 1, a counterweight module 2, a limit module 3 and a data acquisition module 4, wherein the power module 1 comprises a double-shaft inertial vibration exciter 101 and a frequency converter 102 based on a direct-current source vibration motor, the vibration exciter 101 is arranged at the top of an inner frame 201 of the counterweight module 2, and the vibration exciter 101 is connected with the frequency converter 102 through a wire; the counterweight module 2 comprises an inner frame 201, a counterweight 202 placed in the inner frame 201 and a rigid loading plate 203 arranged at the bottom of the inner frame 201; the limit module 3 comprises an outer frame 301 and a limit pulley 302 fixed on the outer frame 301, wherein the limit pulley 302 is abutted with the inner frame 201, and the outer frame 301 is fixed on a roadbed through a ground anchor 303; the data acquisition module 4 comprises a data acquisition device 401 and a vibration displacement meter 402, wherein the data acquisition device 401 comprises a data acquisition instrument 401a and a computer 401b, and the data acquisition instrument 401a is connected with the vibration displacement meter 402 through a wire. According to the law of vibration pressure and valley pressure along with vibration frequency change under different eccentric masses, equipment is installed, parameters are determined, and a debugging device is used for obtaining the change of dynamic action born by a roadbed under the condition that a sine function simulates train load along with time, so that the dynamic stiffness of the roadbed is tested, and the device is high in accuracy of simulating the roadbed to bear the train load, simple and convenient to install, good in test effect and good in stability. In addition, the method of the invention uses the device for simulating the dynamic test of the train load as a test model, sets a horizontal test base surface, installs the excitation device on the roadbed, sets each parameter of the excitation device, installs the eccentric block 101b and the balancing weight 202, starts the excitation device to act on the test base surface to generate the simulated train load, determines the roadbed dynamic stiffness of the site test position according to each parameter, and can analyze and obtain the test result according to the roadbed dynamic stiffness; the method defines a reasonable working frequency range, can better avoid the asynchronous phenomenon of the biaxial rotation of the vibration exciter 101 under the low frequency condition, can also avoid the larger fluctuation of the vibration exciting force output under the high frequency condition, and improves the accuracy of the vibration exciting force output.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (2)
1. The power test method for simulating the train load is realized based on a power test device for simulating the train load, the power test device for simulating the train load comprises a power module (1), a counterweight module (2), a limit module (3), a data acquisition module (4) and a roadbed, the power module (1) comprises a vibration exciter (101) and a frequency converter (102), the vibration exciter (101) is arranged on the counterweight module (2), the frequency converter (102) is connected with the vibration exciter (101) through a first wire (103), the limit module (3) and the data acquisition module (4) are respectively connected with the counterweight module (2), and the limit module (3) is fixed on the roadbed; the vibration exciter (101) comprises a rotating shaft (101 a), and a lamination type eccentric block (101 b) is arranged on the rotating shaft (101 a); the counterweight module (2) comprises an inner frame (201), a counterweight (202) arranged in the inner frame (201) and a rigid loading plate (203) arranged on a bottom plate (201 b) of the inner frame (201), and the vibration exciter (101) is arranged on a top plate (201 a) of the inner frame (201); the limiting module (3) comprises an outer frame (301) and a limiting pulley (302) fixed on the outer frame (301), the limiting pulley (302) is abutted with the inner frame (201), and the outer frame (301) is fixed on the roadbed through a ground anchor (303); the data acquisition module (4) comprises a data acquisition device (401) and a vibration displacement meter (402), the data acquisition device (401) comprises a data acquisition instrument (401 a) and a computer (401 b), the data acquisition instrument (401 a) is connected with the vibration displacement meter (402) through a second wire (403), and the vibration displacement meter (402) is fixed at the central position of the upper surface of the bottom plate (201 b) of the inner frame (201);
the method is characterized by comprising the following steps of:
s1, setting a horizontal test roadbed surface by taking the dynamic test device for simulating the train load as a test model, and installing an excitation device on a roadbed;
s2, setting parameters of an excitation device, and installing an eccentric block and a balancing weight;
specifically, the step S2 includes:
s21, calibrating values of vibration pressure and valley pressure of a simulation test, selecting the number of eccentric block groups of the vibration exciter, and installing the eccentric block groups on the vibration exciter;
s22, determining the output frequency of the excitation device according to the vibration pressure;
s23, determining static balance pressure according to the output frequency and the valley pressure;
s24, installing a balancing weight by utilizing static balance pressure;
s3, starting an excitation device to act on a test roadbed surface to generate a simulated train load, and determining the roadbed dynamic stiffness of a site test position according to each parameter;
s4, analyzing test results according to dynamic stiffness of the roadbed.
2. The power test method for simulating train load according to claim 1, wherein the step S3 comprises:
s31, starting an excitation device, and adjusting a frequency converter according to output frequency to enable the frequency converter to act on a test road surface, so that the excitation device generates train load with sine function change;
s32, carrying out repeated cyclic loading, obtaining dynamic deformation values of repeated cyclic loading after vibration displacement is stable, and calculating an average value of the dynamic deformation values;
s33, determining the dynamic stiffness of the roadbed at the site test position according to the average value.
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