CN-121994626-A - Method and device for reducing loading impact of acceleration loading device, equipment and medium

CN121994626ACN 121994626 ACN121994626 ACN 121994626ACN-121994626-A

Abstract

The application provides a method, a device, equipment and a medium for reducing loading impact of an acceleration loading device, belonging to the technical field of equipment control, wherein the method comprises the steps of determining a starting point coordinate of a track relaxation curve based on a circle center coordinate of a circular arc on the left side of the track and radial deformation; the method comprises the steps of determining a track relaxation curve end point coordinate based on a road surface influence range and a circle center coordinate of tire force on the inside of a road, determining a relation between radial deformation and time, substituting the speed of a device loading unit into the relation between radial deformation and time to obtain the relation between radial deformation and transverse displacement of the device loading unit, wherein the relation between radial deformation and transverse displacement of the device loading unit is a track relaxation curve, and determining physical shape data of the track based on the track relaxation curve start point coordinate, the track relaxation curve end point coordinate, the track relaxation curve and physical structure parameters of the track. The application can reduce the loading impact of the acceleration loading device.

Inventors

ZHAO SHENGNAN
LI QINGCHUN
MENG LONG
ZHAO CUNBAO
LI NANPENG
WANG XUEYAN
WANG YANXIA
LIU NA
ZHAO YINUO
HE YUZHI
CHEN BOYU

Assignees

石家庄铁道大学

Dates

Publication Date: 20260508
Application Date: 20251204

Claims (10)

1. A method of reducing loading shock of an acceleration loading device, comprising: Determining a starting point coordinate of a track relaxation curve based on a circle center coordinate of a circular arc on the left side of the track and a radial deformation amount, determining a finishing point coordinate of the track relaxation curve based on a road surface influence range of tire force on the inside of a road surface and the circle center coordinate, wherein the circle center coordinate is a coordinate origin, and the radial deformation amount is the sum of the tire radial deformation amount under the maximum half axle load and the road surface radial deformation amount; The method comprises the steps of determining a relation between radial deformation and time, substituting the speed of a device loading unit into the relation between the radial deformation and time to obtain a relation between the radial deformation and transverse displacement of the device loading unit, wherein the relation between the radial deformation and transverse displacement of the device loading unit is a track relaxation curve, the acceleration loading device comprises a track, the device loading unit and a loading wheel, the loading wheel is arranged below the device loading unit and is in direct contact with a road surface, the device loading unit is a trolley arranged on the track, and the device loading unit is used for applying radial load to the loading wheel and driving the loading wheel to move along the track; And determining physical shape data of the track based on the track relaxation curve starting point coordinates, the track relaxation curve ending point coordinates and the physical structure parameters of the track relaxation curve and the track, wherein the physical shape data of the track is used for participating in the track shape design of the acceleration loading device.
2. The method for reducing the loading shock of an acceleration loading device according to claim 1, wherein the determining the relation between the radial deformation and time includes: Determining a first relation between radial deformation and axle load and time; the first relation is: ; Wherein, the In order to obtain the radial deformation amount, For the radial deformation of the tire at time t during compression with an applied axial load F, For the radial deformation of the road surface at time t during the application of the axle load F, For each reference point in time in the compression process time period, The time period of the compression process is the time period from the initial contact of the tire and the road surface to the design of the axle load; performing Taylor polynomial expansion on the function of the axle load and the time to obtain a Taylor polynomial of the axle load and the time; the taylor polynomial of the axle load and time is: ; Wherein, the For a reference point in time in the compression process time period, Is that The axle load during the time of the process is equal to the axle load, Is the rest item; obtaining a second relation between radial deformation and time based on the first relation and the Taylor polynomial Each unknown coefficient in the second relation is respectively, and the total number of each unknown coefficient is n+1; Obtaining a second derivative of the second relation to obtain radial acceleration; The method comprises the steps of constructing an objective function and constraint conditions, wherein the objective function is used for representing and minimizing a target value, the target value is the absolute maximum value of radial acceleration in a compression process time period, and the constraint conditions comprise deformation trend constraint, necessary passing point constraint and acceleration non-negative constraint, and the acceleration non-negative constraint is that the radial acceleration in the compression process time period is not less than 0; determining an optimal coefficient group corresponding to each unknown coefficient in the second relation based on the objective function and the constraint condition; Substituting the optimal coefficient group into the second relational expression to obtain a relational expression of radial deformation and time.
3. The method for reducing loading shock of an acceleration loading device according to claim 2, wherein the objective function is: ; wherein Z is an objective function value, the compression process time period is [0, ], The second derivative of radial deformation with time, namely radial acceleration; The deformation trend constraint is as follows: ; Wherein, the A first derivative of the second relationship; the necessary passing point constraint comprises an initial point constraint and an end point constraint, wherein the initial point constraint is that the radial deformation is 0 when the time is 0, and the end point constraint is that the end point abscissa satisfies: ; Wherein, the In order to finally complete the compression time, For the abscissa in the track-relaxation curve start point coordinates, For the abscissa in the orbit relaxation curve end point coordinates, For the lateral movement speed of the device loading unit.
4. The method for reducing the loading shock of the acceleration loading device according to claim 2, wherein the determining the optimal coefficient set corresponding to each unknown coefficient in the second relation based on the objective function and the constraint condition includes: And taking the objective function, the constraint condition and the second relation as inputs, iteratively adjusting all unknown coefficients in the second relation by an interior point method until a preset iteration termination condition is met, and outputting an optimal coefficient group corresponding to all the unknown coefficients in the second relation, wherein each iteration adjustment meets the constraint condition.
5. The method for reducing the loading impact of an acceleration loading device according to claim 1, further comprising, before the determination of the track relaxation curve start point coordinates based on the center coordinates of the circular arc on the left side of the track and the radial deformation amount: Determining a fitting function of the axle load and the radial deformation, wherein the radial deformation is the sum of the tire deformation and the pavement deformation; And determining the maximum half axle load, and substituting the maximum half axle load into a fitting function of the axle load and the radial deformation to obtain the radial deformation.
6. The method of reducing loading shock of an acceleration loading device of claim 5, wherein the determining a fit function of the axle load and the radial deflection comprises: The method comprises the steps of obtaining actually measured tire radial deformation data and simulated tire radial deformation data under different loads, wherein the actually measured tire radial deformation data are test data obtained by carrying out static stiffness test on a loaded tire, and the simulated tire radial deformation data are simulation data obtained through a tire simulation model; determining a data goodness of fit of the tire simulation model based on the data difference of the measured tire radial deformation data and the simulated tire radial deformation data; If the data fitting goodness is smaller than the fitting goodness threshold, updating the tire simulation model until the data fitting goodness of the tire simulation model reaches the fitting goodness threshold; and if the data fitting goodness is not smaller than the fitting goodness threshold, obtaining a fitting function of the axial load and the radial deformation based on the tire simulation model.
7. The method of reducing the loading shock of an acceleration loading device according to claim 1, further comprising, before said determining the track relaxation curve end point coordinates based on the range of influence of the tire force on the road surface inside the road surface and the center coordinates: Establishing a longitudinal section model of the tire and the pavement, wherein the longitudinal section model of the tire and the pavement is used for simulating the movement of aggregate in the pavement under the action of radial load; acquiring aggregate motion trail data in the road surface through a longitudinal section model of the tire and the road surface; Determining an initial pavement influence range of tire force on the interior of the pavement based on the aggregate motion trail data in the pavement; and expanding the initial pavement influence range based on the test range boundary to obtain the pavement influence range.
8. An apparatus for reducing loading shock of an acceleration loading device, comprising: The track alleviation curve end point calculation module is used for determining track alleviation curve starting point coordinates based on circle center coordinates and radial deformation of a circular arc on the left side of a track, determining track alleviation curve end point coordinates based on the road surface influence range of tire force on the inside of a road surface and the circle center coordinates, wherein the circle center coordinates are coordinate origin points, and the radial deformation is the sum of the tire radial deformation under the maximum half axle load and the road surface radial deformation; The track alleviation curve determining module is used for determining a relation between radial deformation and time; substituting the speed of the device loading unit into the relation between the radial deformation and time to obtain a relation between the radial deformation and the transverse displacement of the device loading unit, wherein the relation between the radial deformation and the transverse displacement of the device loading unit is a track alleviation curve, and the acceleration loading device comprises a track, a device loading unit and a loading wheel; The track shape data calculation module is used for determining the physical shape data of the track based on the track relaxation curve starting point coordinates, the track relaxation curve ending point coordinates, the track relaxation curve and the physical structure parameters of the track, wherein the physical shape data of the track are used for participating in the track shape design of the acceleration loading device.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and running on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 7.

Description

Method and device for reducing loading impact of acceleration loading device, equipment and medium Technical Field The application belongs to the technical field of road engineering, and particularly relates to a method, a device, equipment and a medium for reducing loading impact of an acceleration loading device. Background The acceleration loading device (ACCELERATED LOADING DEVICE, ALD) is core equipment for rapidly evaluating long-term performance of the asphalt pavement in the field of road engineering, and can simulate actual traffic load by applying controllable dynamic load, reproduce long-term decay processes such as pavement deformation and material aging in a short time, and be widely applied to pavement material research and development, structural design verification and service performance evaluation. In the prior art, the acceleration loading device has become a key tool for testing the pavement performance by optimizing the loading mode, improving the temperature control precision and expanding the application scene. In the cyclic loading test of the acceleration loading device, the contact characteristic of the loading wheel and the road surface directly influences the accuracy and reliability of the test result. In the prior art, no matter a single-wheel loading mode or a double-wheel loading mode is adopted, impact load can be generated due to instantaneous application of load when the loading wheel is in initial contact with the road surface each time. The impact load is concentrated on the edge area of the pavement test section, so that early local damage to the edge is easy to occur, and pit-shaped diseases are formed when the impact load is serious. The defects can cause a series of linkage problems that after the edges of the pavement are damaged, the load transmission path is abnormal, so that test data are distorted, the overall performance of the pavement cannot be accurately reflected, in extreme cases, equipment faults such as tire burst of a loading tire can be caused by impact load, meanwhile, the damaged pavement needs to be frequently stopped and repaired in the test process, and the loading test efficiency can be reduced. Although the prior art attempts to alleviate the impact by improving the loading hydraulic system, optimizing the grounding characteristics of the tire, or adding an external buffer component, the impact problem when the loading wheel initially contacts the road surface cannot be fundamentally solved, and the defect has become a key bottleneck for restricting the improvement of the test precision and efficiency of the acceleration loading device. Disclosure of Invention The application aims to provide a method, a device, equipment and a medium for reducing the loading impact of an acceleration loading device so as to reduce the loading impact of the acceleration loading device. In a first aspect of the embodiment of the present application, a method for reducing loading impact of an acceleration loading device is provided, including: determining a track relaxation curve starting point coordinate based on the circle center coordinate and the radial deformation of the circular arc on the left side of the track, determining a track relaxation curve ending point coordinate based on the road surface influence range of the tire force on the inside of the road surface and the circle center coordinate, wherein the circle center coordinate is a coordinate origin, and the radial deformation is the sum of the tire radial deformation under the maximum half axle load and the road surface radial deformation; The method comprises the steps of determining a relation between radial deformation and time, substituting the speed of a device loading unit into the relation between the radial deformation and time to obtain a relation between the radial deformation and transverse displacement of the device loading unit, wherein the relation between the radial deformation and transverse displacement of the device loading unit is a track alleviation curve, accelerating the loading device comprises a track, a device loading unit and a loading wheel, the loading wheel is arranged below the device loading unit and is in direct contact with a road surface, the device loading unit is a trolley arranged on the track, and the device loading unit is used for applying radial load to the loading wheel and driving the loading wheel to move along the track; and determining physical shape data of the track based on the start point coordinates of the track relaxation curve, the end point coordinates of the track relaxation curve and the physical structure parameters of the track, wherein the physical shape data of the track is used for participating in the track shape design of the acceleration loading device. In a second aspect of the embodiment of the present application, there is provided a device for reducing loading impact of an acceleration loading device, including: The track alleviation