CN113504059A

CN113504059A - Control system and method of wheel-rail relation test bed

Info

Publication number: CN113504059A
Application number: CN202110911409.9A
Authority: CN
Inventors: 常崇义; 陈波; 胡晓依; 李兰; 白鑫; 李果
Original assignee: Railway Science and Technology Research and Development Center of CARS
Current assignee: Railway Science and Technology Research and Development Center of CARS
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2021-10-15
Anticipated expiration: 2041-08-10
Also published as: CN113504059B

Abstract

The application provides a control system and a method of a wheel-rail relation test bed, which can comprise the following steps: the device comprises a flow control module, a parameter adjusting module, a signal acquisition module and a state monitoring module. The process control module is used for generating a test process task and a step calling rule for controlling the operation of the wheel-rail relation test bed, and issuing the operation step of the test process task to the wheel-rail relation test bed according to the step calling rule, wherein the test process task comprises a plurality of process task files, and the process task files comprise target values of a plurality of control parameters. The parameter adjusting module is used for converting the target values of the control parameters into command values of an executing mechanism of the wheel-rail relation test bed respectively. The signal acquisition module is used for acquiring state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters. And the state monitoring module responds to the state parameters exceeding the alarm threshold value, and generates and sends out an emergency stop instruction for controlling the wheel-rail relation test bed.

Description

Control system and method of wheel-rail relation test bed

Technical Field

The application relates to the technical field of rail transit test equipment, in particular to a control system and a control method of a wheel-rail relation test bed.

Background

In the development process of high-speed railways, the research on the wheel-rail relationship is one of the popular research directions, and the wheel-rail relationship has important influence on the safety, the comfort and the line maintenance of vehicle operation. However, when the wheel-rail relationship problem is tested and researched on an actual line, the test period is long, the cost is high, and the wheel-rail relationship problem is easily influenced by weather and environment; in addition, there is a significant safety risk in performing tests on, for example, fatigue cracks, wheel damage, derailments, and the like. Based on this, the mode that adopts the laboratory test is economic high-efficient, and the influence factor is controllable, has very important value to the influence of research test list factor to the wheel rail relation and the experiment and the research of extreme condition.

At present, the german DB system technology center, Luchini, italy, and the japan railway integrated technology institute have built a wheel-rail system test stand for performing a laboratory test. However, based on the current situation of 350km/h of the high-speed railway in China and the highest line test speed of 486.1km/h, the test capability of the wheel-rail relation test bed is difficult to meet the development requirement of the high-speed railway. In addition, the test procedures are different inevitably according to the difficulty degree of the test working conditions of different tests. Particularly, for exploratory tests such as braking and scratch impact, the variation trend and the range of parameters such as speed and force in the test execution process cannot be expected in advance, and the test flow cannot be executed according to fixed steps but needs to be dynamically adjusted according to the variation condition. The conventional wheel-rail relation test bed is difficult to provide a convenient and flexible test flow making scheme for tests according to different test working conditions.

Disclosure of Invention

The present application provides a control system of a wheel-rail relation test stand and a method thereof, which is intended to solve or partially solve at least one of the above problems related to the background art and other disadvantages of the related art.

The present application provides a control system of such a wheel-rail relationship test stand, which may include: the device comprises a flow control module, a parameter adjusting module, a signal acquisition module and a state monitoring module. The process control module is used for generating a test process task and a step calling rule for controlling the operation of the wheel-rail relation test bed, and issuing the operation step of the test process task to the wheel-rail relation test bed according to the step calling rule, wherein the test process task comprises a plurality of process task files, and the process task files comprise target values of a plurality of control parameters. The parameter adjusting module is used for converting the target values of the control parameters into command values of an executing mechanism of the wheel-rail relation test bed respectively. The signal acquisition module is used for acquiring state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters. And the state monitoring module responds to the state parameters exceeding the alarm threshold value, and generates and sends out an emergency stop instruction for controlling the wheel-rail relation test bed.

In some embodiments, the test flow task includes a first flow task file. The first flow task file may have recorded: the method comprises the steps of sequence number, time switch, condition switch, target values of a plurality of control parameters and change rate values of the target values. The time switch comprises shortest running time and longest running time, and the condition switch comprises condition reference control parameters, condition judgers, condition values and condition jump targets.

In some embodiments, the step invocation rule comprises a first step invocation rule. The first step invocation rule may include:

the first step calls rules including: a running step of triggering the flow control module to send the condition jump target corresponding to the step serial number to the wheel-rail relation test bed in response to that the running time of the wheel-rail relation test bed reaches the shortest running time corresponding to the step serial number and does not exceed the longest running time corresponding to the step serial number and that the condition reference control parameter corresponding to the step serial number meets the condition value corresponding to the condition judgment symbol; and

and triggering the next operation step of the flow control module for sending the step sequence number to the wheel-rail relation test bed until all operation steps of the first flow task file are completed in response to the fact that the operation time of the wheel-rail relation test bed reaches the longest operation time corresponding to the step sequence number.

In some embodiments, the test flow task includes a second flow task file.

The second process task file may have recorded: time switch, target values of a plurality of control parameters. The time switch comprises a plurality of running moments of the wheel-rail relation test bed, wherein a time interval exists between adjacent running moments.

In some embodiments, the step invocation rule comprises a second step invocation rule.

The second step invocation rule may include: and taking the time sequence of the plurality of running moments as a sequence of each running step in the second process task file sent to the wheel-rail relation test bed by the process control module until all running steps of the second process task file are completed.

In some embodiments, the test procedure tasks may include all of the procedure task files,

the third flow task file may have recorded: step sequence number, cycle execution times, and all process task names and storage paths thereof.

In some embodiments, the step call rule comprises a third step call rule:

the third step call rule may include: and when the number of times of calling the flow task file corresponding to the flow task name reaches the number of times of circular execution, triggering the flow control module to issue the next operation step of the step number to the wheel-rail relation test bed until all operation steps of the third flow task file are completed.

In some embodiments, the executing step of the condition monitoring module may include:

in response to the status parameter exceeding the warning threshold, starting its built-in delay timer; when the delay timer reaches the preset warning delay time, generating a warning message and pausing the delay timer; starting a delay timer in response to the status parameter exceeding the alarm threshold; and generating and sending an emergency stop instruction for controlling the wheel-rail relation test bed when the delay timer reaches the preset alarm delay time.

The application also provides a control method of the wheel-rail relation test bed, which can comprise the following steps:

generating a test flow task and a step calling rule for controlling the running of the wheel-rail relation test bed, and issuing the running step of the test flow task to the wheel-rail relation test bed according to the step calling rule, wherein the test flow task comprises a plurality of flow task files, and the flow task files comprise target values of a plurality of control parameters. The target values of the plurality of control parameters are converted into command values of an actuator of the wheel-rail relationship test stand. The state parameters of the wheel-rail relation test stand under the control of the command values of the plurality of control parameters are collected. And generating and sending an emergency stop command for controlling the wheel-rail relation test bed in response to the state parameter exceeding the alarm threshold value.

In some embodiments, the test flow task includes a first flow task file. The first flow task file may have recorded: the method comprises the steps of sequence number, a time switch, a condition switch, target values of a plurality of control parameters and change rate values of the target values, wherein the time switch comprises the shortest running time and the longest running time, and the condition switch comprises condition reference control parameters, condition judgers, condition values and condition jump targets.

In some embodiments, the step invocation rule comprises a first step invocation rule. The first step invocation rule may include: a running step of triggering the flow control module to send the condition jump target corresponding to the step serial number to the wheel-rail relation test bed in response to that the running time of the wheel-rail relation test bed reaches the shortest running time corresponding to the step serial number and does not exceed the longest running time corresponding to the step serial number and that the condition reference control parameter corresponding to the step serial number meets the condition value corresponding to the condition judgment symbol; and

In some embodiments, the test flow task includes a second flow task file.

The second process task file may have recorded: the control system comprises a time switch and a plurality of target values of control parameters, wherein the time switch comprises a plurality of running moments of the wheel-rail relation test bed, and a time interval exists between adjacent running moments.

In some embodiments, the step invocation rule comprises a second step invocation rule. The second step calls the rule to include: and taking the time sequence of the plurality of running moments as a sequence of each running step in the second process task file sent to the wheel-rail relation test bed by the process control module until all running steps of the second process task file are completed.

In some embodiments, the test procedure task includes all of the procedure task file. The third flow task file may have recorded: step sequence number, cycle execution times, and all process task names and storage paths thereof.

In some embodiments, the step call rule comprises a third step call rule.

The third step calls rules including: and when the number of times of calling the flow task file corresponding to the flow task name reaches the number of times of circular execution, triggering the flow control module to issue the next operation step of the step number to the wheel-rail relation test bed until all operation steps of the third flow task file are completed.

In some embodiments, the specific step of generating and issuing the emergency stop command for controlling the wheel-rail relation test stand in response to the state parameter exceeding the alarm threshold comprises:

in response to the status parameter exceeding the warning threshold, starting its built-in delay timer;

when the delay timer reaches the preset warning delay time, generating a warning message and pausing the delay timer;

starting a delay timer in response to the status parameter exceeding the alarm threshold; and

and when the delay timer reaches the preset alarm delay time, generating and sending an emergency stop instruction for controlling the wheel-rail relation test bed.

According to the technical scheme of the embodiment, at least one of the following advantages can be obtained.

According to the control system and the control method of the wheel-rail relation test bed in the embodiment of the application, support is provided for the whole process from automatic starting to test to shutdown of the wheel-rail relation test bed through the arrangement of the four functional modules, and the dependence of the whole wheel-rail relation test on personnel is reduced; in addition, a plurality of test process tasks and step calling rules are set through the process control module, so that the requirements of different test working conditions can be met; and by monitoring the state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters, warning information can be provided for a user, or emergency stop treatment can be carried out, and the running safety of the wheel-rail relation test bed can be ensured while the accidental extreme value interference in the running process is avoided.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of a control system architecture of a wheel-rail relationship test stand according to an exemplary embodiment of the present application;

FIG. 2 is a schematic diagram of an operational process of a control system of a wheel-rail relationship test stand according to an exemplary embodiment of the present application;

FIG. 3 is a schematic diagram of a process for adjusting a force of an actuator by a parameter adjustment module of a control system of a wheel and rail relationship test stand according to an exemplary embodiment of the present application;

FIG. 4 is a graph of status parameters, timing times of delay timers, and warning states over time for the monitoring parameters of the control system of the wheel and rail relationship test stand according to an exemplary embodiment of the present application; and

fig. 5 is a flowchart of a control method of a wheel-rail relationship test stand according to an exemplary embodiment of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

In the drawings, the size, dimension, and shape of elements have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art. In addition, in the present application, the order in which the processes of the respective steps are described does not necessarily indicate an order in which the processes occur in actual operation, unless explicitly defined otherwise or can be inferred from the context.

It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In addition, the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 is a schematic view of a control system structure of a wheel-rail relationship test stand according to an exemplary embodiment of the present application.

As shown in fig. 1, the present application provides a control system for a wheel-rail relationship test stand, which may include: the system comprises a flow control module 1, a parameter adjusting module 2, a signal acquisition module 3 and a state monitoring module 4. The flow control module 1 is configured to generate a test flow task and a step calling rule for controlling the operation of the wheel-rail system test bed, and issue the operation step of the test flow task to the wheel-rail system test bed according to the step calling rule, where the test flow task includes a plurality of flow task files, and the flow task files include target values of a plurality of control parameters. The parameter adjusting module 2 is used for converting the target values of the plurality of control parameters into command values of an executing mechanism of the wheel-rail relation test bed respectively. The signal acquisition module 3 is used for acquiring state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters. The state monitoring module 4 responds to the state parameters exceeding the alarm threshold value, and generates and sends out an emergency stop instruction for controlling the wheel-rail relation test bed.

This application provides support for the whole process of the automatic start of wheel rail relation test bench, test to shutting down through the cooperation of above-mentioned four functional module, has reduced the dependence of whole wheel rail relation test process to personnel. Fig. 2 is a schematic view of an operation process of a control system of a wheel-rail relationship test stand according to an exemplary embodiment of the present application. The operation process of the control system of the present application when applied to the wheel-rail relation test bed can refer to fig. 2.

In particular, the wheel-rail relationship test stand may include a loading device and a rail-wheel device. The loading device may include longitudinal actuators, lateral actuators, and vertical actuators. In this application, two longitudinal actuators, one transverse actuator and two vertical actuators are provided. The actuator is also called a vibration exciter and is an actuating mechanism of the wheel-rail relation test bed. Each actuator of the loading device can generate acting force under the control of the control system according to the specific test requirement of the wheel-rail relation test to be carried out, and further load in the corresponding direction is applied to the test wheel. The rail-wheel arrangement may comprise a rail-wheel and a drive unit. The diameter of the rail wheel can be set to 3000mm, and the material of the rail wheel can be the material which is consistent with the material and standard of the high-speed railway track, such as U71MnK material, so that the test precision is consistent with the maximum in the actual line test, and the construction cost is reduced as much as possible.

The flow control module 1 can generate a test flow task and a step calling rule for controlling the operation of the wheel-rail relation test bed. Specifically, the test flow task may include a first flow task file, a second flow task file, and a third flow task file. All the operation steps of the wheel-rail relation test table test are contained in each process task file. The flow control module 1 calls the operation steps in each flow task file according to the step calling rule. The contents of the first process task file, the second process task file and the third process task file are different, but the contents of the first process task file, the second process task file and the third process task file all contain target values of a plurality of control parameters of the wheel-track relation test bed. In particular, the control parameter may be force, displacement, velocity, pressure, without limitation.

TABLE 1

Table 1 is a first flow task file. As shown in table 1, the first flow task file records the operation steps, the time switch, the condition switch, the remarks, the control parameters and the change rate values thereof. In the condition switch, X indicates that no switch is provided; in the control parameter and its rate of change values, X denotes to remain unchanged.

Specifically, the number of operation steps may be set according to requirements, and is not limited herein. The time switch may include a minimum running time and a maximum running time of the wheel-rail relation test stand, for example, the minimum running time of the 1 st running step is set to 5s, the maximum running time of the 1 st running step is 10s, the minimum running time of the 2 nd running step is 5s, the maximum running time of the 2 nd running step is 20s, the minimum running time of the 3 rd running step is 5s, and the maximum running time of the 3 rd running step is 30 s. The condition switch may include a condition reference control parameter, a condition judger, a condition value, and a condition jump target. For example, the condition switch is not provided in the 1 st operation step. The condition reference control parameter in the operation step 2 is "track wheel speed", the condition judger is "=", the condition value is "300", and the condition jump target is "next step"; in other words, when the speed of the rail wheel is 300km/h, the wheel-rail relation test bed jumps from the current running step to the next running step. The condition reference control parameter in the operation step 3 is ' lateral vibration speed ', the condition judger is ' >, the condition value is ' 36 ', and the condition jump target is ' step 5 '; in other words, when the transverse vibration speed is greater than 36km/h, the wheel-rail relation test bed jumps from the current running step to the 5 th running step. The remark part in table 1 can annotate according to the actual effect of the corresponding step, for example, if the actual effect of the 1 st operation step is the set load, the remark is the set load; the actual effect of the 2 nd operation step is speed increasing, and the remark is speed increasing. Note that the remarks only play a role in prompting or recording. The target values of the control parameters and the change rate values thereof can be set according to requirements. For example, the target value of the rail wheel speed and the rate of change of the rail wheel speed in the 1 st running step may be set to be kept constant, the target value may be set to 80kN, and the rate of change of the vertical force may be set to 5 kN/s; the target value of the rail wheel speed of the 2 nd operation step may be set to 300km/h, the change rate of the rail wheel speed may be set to 3.6km/h/s, and the target value and the change rate of the vertical force may be set to be maintained constant; the target values of the respective control parameters of the 3 rd operation step and the rate values thereof are set to be kept constant. It should be noted that, the target values and the change rates of the remaining control parameters are added according to the control parameter requirements, and are not limited to the contents in table 1.

In some embodiments, the first step call rule for the first flow task file is: and when the running time of the wheel-rail relation test bed reaches the shortest running time corresponding to the sequence number of the current step, and does not exceed the longest running time corresponding to the sequence number of the current step, and the condition reference control parameter meets the condition value corresponding to the condition judgment symbol, triggering the flow control module 1 to issue a running step of a condition jump target corresponding to the sequence number of the current step to the wheel-rail relation test bed. For example, in the 3 rd operation step of table 1, when the operation time of the wheel-rail relationship test bed reaches 5 seconds and the lateral vibration speed is greater than 36km/h, the flow control module 1 sends the operation step of the 5 th operation step to the wheel-rail relationship test bed according to the condition jump target corresponding to the 3 rd operation step. And when the running time of the wheel-rail relation test bed reaches the longest running time corresponding to the sequence number of the current step, the flow control module 1 issues the next running step of the sequence number of the current step to the wheel-rail relation test bed. For example, in the operation step 3 of table 1, when the operation time of the wheel-rail relationship test bed reaches 30 seconds, and the lateral vibration speed is not greater than 36km/h, the flow control module 1 issues the next operation step of the current step sequence number, that is, the operation step 4, to the wheel-rail relationship test bed without considering the corresponding condition jump target. And (3) until all the operation steps of the first process task file are completed, the process control module 1 sends a shutdown instruction to the wheel-rail relation test bed. Based on the condition that all condition control parameters in the first flow task file are preset, the first step calling rule is suitable for the test working condition that the control parameters change at a constant speed and stably run at a certain target value.

In some embodiments, the process control module 1 generally calls a first process task file to perform a creep test and an adhesion test on the wheel track by using a first step calling rule.

TABLE 2

Table 2 is a first process task file when the process control module 1 performs adhesion test on the wheel rail relationship. It can be seen that the control parameters include vertical force, rail wheel speed, creep rate, water spray status, and data storage status. Specifically, first, the target value of the vertical force was set to 75kN, the vertical force change rate was set to 20kN/s, the shortest operation time thereof was set to 1s, and the longest operation time thereof was set to 30 s. Further, when the vertical force reaches the target value of 75kN, the next step is skipped. For example, the vertical force before the test is 50kN, and based on the set vertical force change rate of 20kN/s, the vertical force can reach the target value when the running time reaches 1.25s, the time is 1.25s, and when the shortest running time is already exceeded but the longest running time is not exceeded, the next step can be skipped. It should be noted that the purpose of this step is to set the load. Likewise, the target value of the rail wheel speed is set to 400km/h, and the change rate of the rail wheel speed is set to 3.6km/h/s, the shortest running time thereof is set to 10s, and the longest running time thereof is set to 120s in the 2 nd running step. Further, when the rail wheel speed reaches 400km/h, the next step is skipped. Specifically, when the change rate of the rail wheel speed is 3.6km/h/s, the initial speed is 0km/h, the time is 111.1s, the shortest running time is exceeded, and the longest running time is not reached, and the next step can be directly skipped. It should be noted that the purpose of this step is to speed up. In the operation step 3, the water spraying state is set to be on, the data storage state is set to be on, the shortest operation time and the longest operation time are set to be 3s, namely the time for opening the water spraying valve and the time for starting data storage can be ignored, the step is executed after the water spraying is finished for 3s, and then the next step is skipped. It should be noted that the purpose of this step is water spraying and data storage. In the 4 th operation step, the target value of the creep rate is set to be-10%, namely the speed of the rail wheel is kept unchanged, and the speed of the rail wheel is reduced by 10%; the rate of change of the creep rate was set to 0.2%/s, and the shortest operating time was set to 50s and the longest operating time was set to 60 s. When the creep rate reaches-10% in the range of the shortest running time and the longest running time, the next step is skipped. It is noted that the purpose of this step is to increase the creep rate. In the 5 th operation step, the target value of the creep rate is set to 0%, the rate of change thereof is still 0.2%/s, and the shortest operation time is set to 50s and the longest operation time is set to 60 s. When the creep rate reaches 0% in the range of the shortest running time and the longest running time, the next step is skipped. It is noted that the purpose of this step is to reduce the creep rate. In the 6 th operation step, water injection is stopped and data storage is stopped, and 1s later execution is skipped to the next step. It should be noted that the purpose of this step is to stop the water spray and the data storage. In the 7 th operation step, the target value of the track wheel speed is set to be 0km/h, the change rate is still 3.6km/h/s, the track wheel speed is increased to 400km/s based on the 2 nd operation step, the target speed is reached to 0km/h after 111.1s, the step is the last step in the table 2, and the experiment process can be quitted after the experiment is finished. It should be noted that the purpose of this step is to slow down.

Based on the above, when the adhesion test is performed on the wheel rail, the condition switch of the first process task file only serves the purpose of accurately controlling the target value of the control parameter. In other words, if the condition switch is not provided, the running time required for the wheel-rail relation test bed to reach the target value of a certain control parameter can be calculated through the current value, the target value and the change rate of the control parameter, and then each running step can be sequentially executed. Of course, if the condition switch is not provided, a certain slight deviation occurs due to the influence of the control accuracy. However, when the braking force is not a constant value during the braking test of the wheel rail, especially under the condition of a wet rail member, the intervention of an antiskid device exists, so that the change of the braking force and the trend of the reduction of the wheel speed of the wheel cannot be predicted, the execution of the experiment can be controlled only through condition judgment, and the setting of a condition switch is very important.

TABLE 3

Table 3 is a first process task file for the brake test of the wheel rail relationship by the process control module 1. As can be seen, the control parameters include vertical force, rail wheel speed, rail wheel motor control mode, simulated vehicle axle weight, brake pressure, water spray status, and data storage status. Specifically, first, the target value of the vertical force was set to 75kN, the vertical force change rate was set to 20kN/s, the shortest operation time thereof was set to 1s, and the longest operation time thereof was set to 30 s. Further, when the vertical force reaches the target value of 75kN, the next step is skipped. For example, the vertical force before the test is 50kN, and based on the set vertical force change rate of 20kN/s, the vertical force can reach the target value when the running time reaches 1.25s, the time is 1.25s, and when the shortest running time is already exceeded but the longest running time is not exceeded, the next step can be skipped. It should be noted that the purpose of this step is to set the load. Likewise, the target value of the rail wheel speed is set to 380km/h, and the change rate of the rail wheel speed is set to 3.6km/h/s, the shortest running time thereof is set to 10s, and the longest running time thereof is set to 120s in the 2 nd running step. Further, when the rail wheel speed reaches 380km/h, and the running time is between the shortest running time and the longest running time, the next step is skipped. It should be noted that the purpose of this step is to speed up. In the operation step 3, the water spraying state is set to be on, the data storage state is set to be on, the shortest operation time and the longest operation time are set to be 3s, namely the time for opening the water spraying valve and the time for starting data storage can be ignored, the step is executed after the water spraying is finished for 3s, and then the next step is skipped. It should be noted that the purpose of this step is water spraying and data storage. The 4 th operation step switches the control mode of the track wheel motor into an inertia control mode, and the track wheel motor only provides a resistance moment in the inertia control mode, wherein the resistance moment is obtained by real-time calculation of the process control module 1 according to the simulated translational inertia of the vehicle; further, the axle weight of the simulated vehicle is set to 15t, and the wheel-rail relationship test stand performs 1s later and jumps to the next step for the purpose of switching the control mode and setting the axle weight. In the 5 th operation step, braking is started, specifically, the target value of the brake pressure is set to 2.1bar, the change rate of the brake pressure is set to 2bar/s, and the shortest operation time and the longest operation time are both 1s, that is, the wheel-rail relation test bench jumps to the next step after executing the step 1 s. The 6 th operation step is a first braking stage, which aims to reduce the speed of the rail wheel to be less than 300km/s, and the operation time of the wheel-rail relation test bed is difficult to determine because the change rate of the speed of the rail wheel is a non-fixed value and is unpredictable, wherein the shortest operation time is estimated to be 1s according to experience, and the longest operation time is estimated to be 300 s; the setting value of the longest operation time can be any value far exceeding the actual longest operation time, and is not limited herein, so as to ensure that the next step can be carried out after the operation is carried out to the set longest operation time at most under the abnormal condition. The purpose of the 7 th operation step is to change the brake pressure, in which the target value of the brake pressure is set to 3.6bar, the rate of change of the brake pressure is still 2bar/s, and the longest operation time and the shortest operation time of the wheel-rail system test stand are both 1s, that is, the wheel-rail system test stand jumps to the next step after performing the step 1 s. The 8 th operation step is a second braking stage, the speed of the rail wheel is reduced to be less than 10km/s, the operation time of the wheel-rail relation test bed is difficult to determine because the change rate of the speed of the rail wheel is a non-fixed value and is unpredictable, the shortest operation time is estimated to be 1s according to experience, and the longest operation time is estimated to be 300 s; the setting value of the longest operation time can be any value far exceeding the actual longest operation time, and is not limited herein, so as to ensure that the next step can be carried out after the operation is carried out to the set longest operation time at most under the abnormal condition. The purpose of the 9 th operation step is to stop the water spray, and the wheel-rail relation test stand jumps to the next step after performing the step 1 s. The 10 th operation step is a third braking stage, in which the speed of the rail wheel is reduced to be less than 0.5km/s, and the operation time of the wheel-rail relation test bed is difficult to determine because the change rate of the speed of the rail wheel is a non-fixed value and is unpredictable, wherein the shortest operation time is estimated to be 1s according to experience, and the longest operation time is estimated to be 300 s; the setting value of the longest operation time can be any value far exceeding the actual longest operation time, and is not limited herein, so as to ensure that the next step can be carried out after the operation is carried out to the set longest operation time at most under the abnormal condition. It should be noted that the speed parameter is involved in the calculation of the inertia moment, and the calculation cannot be performed after the speed of the rail wheel is approximately 0km/s, so that the control mode needs to be switched when the speed of the rail wheel is braked to a sufficiently small speed, so that the 11 th operation step is a switching control mode, that is, the rail wheel motor public duty mode is switched to the speed control mode, and the next step is skipped after the wheel-rail relation test stand performs the step 1 s. The 12 th operation step is the brake end, namely, the target value of the brake pressure is set to-1 bar, and the brake pressure change rate is 5bar/s, so as to release the brake pressure. And setting the longest running time and the shortest running time of the wheel-rail relation test bed to be 1s, namely ending the braking after the wheel-rail relation test bed executes the step 1s, and jumping to the next step. And a 13 th operation step of setting the target value of the speed of the rail wheel to be 0km/h, setting the shortest operation time to be 1s and the longest operation time to be 5s, ending the test after the operation for 1s, and simultaneously stopping data storage.

The adhesion test and the braking test of the wheel-rail relation test bed can be executed according to the sequence of the corresponding process task file, but for the impact test, the magnitude of the wheel-rail impact force under the given load and the given track wheel speed cannot be predicted, if the step sequence is executed according to the step sequence number, certain risks may exist, and at the moment, the operation steps are jumped through the condition switch, so that the risks can be effectively avoided.

TABLE 4

Table 4 is a first process task file for the impact test of the wheel rail relationship by the process control module 1. It can be seen that the control parameters include vertical force, rail wheel speed, and data storage status. Specifically, the 1 st operation step is mainly used for setting the load, specifically, the target value of the vertical force is set to be 40kN, the change rate of the vertical force is set to be 5kN/s, the shortest operation time of the wheel-rail relation test bed in the step is set to be 1s, the longest operation time of the wheel-rail relation test bed is set to be 10s, and when the vertical force reaches 40kN between the shortest operation time and the longest operation time, the next step is skipped; the data storage state is also adjusted to be on in run 1. The 2 nd operation step is mainly used for accelerating speed, the target value of the rail wheel speed is set to be 10km/h, the rail wheel speed change rate is set to be 3.6km/h/s, the shortest operation time of the wheel-rail relation test bed in the step is set to be 1s, the longest operation time of the wheel-rail relation test bed is set to be 10s, and when the rail wheel speed reaches 10km/h between the shortest operation time and the longest operation time, the next step is skipped. The purpose of the 3 rd operation step is to detect the working condition of the wheel-rail relation test bed under the condition that the speed of the rail wheel is 10km/h and the vertical force is 40kN, namely the magnitude of the impact force of the wheel rail; the shortest running time of the wheel-rail relation test bed is 1s, and the longest running time is 30 s. Reducing the load when the impact force between the wheel rails exceeds the limit value of 190kN between the set shortest running time and the set longest running time, namely resetting the target value of the vertical force to 40kN, jumping to the 12 th running step, and carrying out a working condition test with the speed of the rail wheels being 20 km/h; and if the impact force between the wheel rails does not reach 190kN between the set shortest running time and the set longest running time, jumping to the 4 th running step to continue the test after the running time reaches 30 s. That is, in the detection of the impact force between the wheel rails, the impact force between the corresponding wheel rails at each track wheel speed between 10km/h and 300km/h is continuously detected starting from the track wheel speed of 10km/h and with the track wheel speed increase gradient of 10 km/h; in addition, when the impact force between the wheel tracks corresponding to the same track wheel speed is detected, the magnitude of the impact force of the wheel tracks corresponding to each vertical force is continuously tested by taking 10kN as the gradient value of the vertical force, and the next track wheel speed is skipped to for testing until the impact force between the wheel tracks exceeds the limit value. The method has the advantages that for the wheel abrasion with different degrees, the test data of the change of the wheel track impact force along with the speed and the load of the rail wheel can be obtained through one test, the condition that the test is conducted on different working conditions one by one is not needed, and the method is safe and efficient.

TABLE 5

Table 5 is a second process task file. As shown in table 5, the second process task file may be recorded with: time switch, target values of a plurality of control parameters and rate of change values thereof. Specifically, the time switch includes a plurality of operation moments of the wheel-rail relationship test bed, wherein a time interval exists between adjacent operation moments, and the time interval is 0.01s in table 5, but the time interval can be set according to requirements, for example, the time interval can be set to 0.1s, and can also be set to 1 s. It should be noted that, no matter what value is set for the time interval, the interpolation is performed according to 0.001s to reduce the size of the file, and avoid the situation that the control system is crashed due to the fact that the occupied memory is too large when the control system runs for a long time. The target values of the plurality of control parameters include a left-side vertical force, a right-side vertical force, a lateral position, a rail wheel speed, and the like, and the types of the control parameters are not limited thereto and can be set according to specific situations. Wherein the left vertical force is equivalent to the vertical force applied to the left wheel pair; the right vertical force corresponds to the vertical force applied to the right wheel pair. Specifically, when the running time is 0s, the left vertical force is 80kN, the right vertical force is 80kN, the transverse position is 0mm, and the speed of the rail wheel is 0 km/h. When the running time is 0.01s, the left vertical force is 80kN, the right vertical force is 80kN, the transverse position is 0mm, and the speed of the rail wheel is 0.036 km/h. When the running time is 0.02s, the left vertical force is 80kN, the right vertical force is 80kN, the transverse position is 0mm, and the speed of the rail wheel is 0.072 km/h. When the running time is 0.03s, the left vertical force is 80kN, the right vertical force is 80kN, the transverse position is 0mm, and the speed of the rail wheel is 0.108 km/h.

In some embodiments, the second step invocation rule for the second process task file may include: and taking the time sequence of the plurality of running moments as the sequence of each running step in the second process task file sent to the wheel-rail relation test bed by the process control module. And (3) until all the operation steps of the first process task file are completed, the process control module 1 sends a shutdown instruction to the wheel-rail relation test bed. In other words, when the operating time of the wheel-rail relation test stand reaches a certain operating time in table 5, the step corresponding to the operating time is executed. Based on the condition that each operation step in the second process task file can only be executed according to a set time course curve, the calling rule of the second step is suitable for the test working condition that the target value of the control parameter changes randomly, so that the test can be conveniently carried out by using data obtained by field detection or simulation analysis, for example, for the tests of abrasion, fatigue and the like, load data collected by a line is often required to be used as the test input condition.

TABLE 6

Table 6 is a third flow task file. As shown in table 6, the first process task file and the second process task file are combined as required, and are invoked according to the sequence of the operation steps. The cycle number is the call number of the flow task file corresponding to the current operation step, for example, if the cycle number in the 1 st operation step is 1, the first flow task file is called from the initial path of the first flow task file for 1 time; if the cycle number in the 2 nd operation step is 1, calling the second process task file from the first process path of the second process task file for 1 time; if the cycle number in the operation step 3 is 3, calling the second process task file 3 times from a second process path of the second process task file; if the cycle number in the 4 th operation step is 2, calling the first flow task file for 2 times from a third process path of the first flow task file; and repeating the steps until the first flow task file is called from the termination path for 1 time according to the setting of the cycle times, and then sending a shutdown instruction to the wheel-rail relation test bed by the flow control module 1. It should be noted that, the contents of the first process task file and the second process task file and the corresponding step invoking rules are referred to above, and are not described herein again. The third step calling rule is convenient for testers to flexibly make a test flow and complete a relatively complex test, for example, when the adhesion test is performed on the wheel rail relation test bed, the increase and decrease processes of the creep slip rate are nonlinear changes, such as changes in a sine curve, and at this time, the flow control module 1 can call a third flow task file to perform the test by adopting the third step calling rule.

TABLE 7

TABLE 8

TABLE 9

Watch 10

Table 7 is a first initial call file, table 8 is a second call file, table 9 is a first termination call file, and table 10 is a third flow task file when performing an adhesion test on the wheel rail relationship test bed. Specifically, in the 1 st operation step, a first initial calling file is called, and the first initial calling file is executed 1 time according to the operation step sequence in the first initial calling file, and specific calling rules can be referred to above, and are not described herein again; in the 2 nd operation step, the second call file is called, and the second call file is executed for 1 time according to the operation time sequence of the second call file, and specific call rules can be referred to above, and are not described herein again; in the operation step 3, the first termination call file is called, and the first termination call file is executed 1 time according to the operation step sequence of the first termination call file, and the specific call rule may refer to the above, which is not described herein again.

The parameter adjusting module 2 can adjust control parameters such as force of each actuator, rotating speed of a rail wheel, brake pressure and the like by adopting an electronic PIV (particle image velocimetry) adjuster, so that target values of the control parameters in a test flow task are converted into command values which can be identified by corresponding actuating mechanisms of the wheel-rail relation test bed.

FIG. 3 is a schematic diagram of a process for adjusting the force of an actuator by a parameter adjustment module of a control system of a wheel and rail relationship test stand according to an exemplary embodiment of the present application. As shown in fig. 3, a force command value at the present time is obtained according to a force target value and a change rate thereof set in the test flow task, and then a force command value gradient, i.e., d/dt, is obtained by differentiating the force command value with time. Meanwhile, the signal obtained from the force sensor is converted to obtain the calibration value of the force at the current moment, the deviation value of the force is subtracted, and then the measurement value of the force at the current moment is obtained, wherein the deviation value of the force can be obtained according to the calibration of the initial installation position of the test wheel pair. And calculating the force command value, the force command value gradient and the force measurement value through a force controller to obtain an opening command value of the actuator valve, so that the force of the actuator is adjusted in real time.

Of course, the parameter adjusting module 2 may also adjust the control parameters such as the rotation speed of the rail wheel and the brake pressure by using different electronic PIV regulators, which is not limited herein.

The signal acquisition module 3 is used for acquiring state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters. The signal acquisition module 3 comprises a telemetry decoder, a photoelectric encoder, a force sensor, a travel sensor and the like. The sampling frequency, the acquisition time, the storage mode and the like of the signal acquisition module 3 can be preset according to requirements, and then the signal acquisition module 3 acquires the state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters according to the preset sampling frequency and the acquisition time. Specifically, a measuring bridge is arranged on the track wheel spoke for measuring the wheel-rail contact force; the photoelectric encoder is arranged on a driving unit of the rail wheel, such as the shaft ends of a rail wheel motor and an adhesion wheel motor, and is used for measuring the rotating speed of the motor; the force sensors are arranged on 1 transverse actuator, 2 vertical actuators and 2 longitudinal actuators and are used for measuring the loads in the three directions; the stroke sensors are mounted on the actuators to measure the strokes thereof. The signal collector converts the state parameters into physical quantity units, such as wheel-rail contact force, the rotating speed of the rail wheel, the load of the actuator and the stroke of the actuator. The signal acquisition module 3 converts the state parameters into physical units, and then performs image-text display, control adjustment, limit value monitoring and the like. And further, performing data storage on the state parameters according to a preset storage mode so as to facilitate subsequent calling.

The state monitoring module 4 monitors the running state of the test process according to each state parameter acquired by the signal acquisition module 3. The state monitoring module 4 responds to the state parameter exceeding the alarm threshold value, and generates and sends out an emergency stop instruction for controlling the wheel-rail relation test bed.

Specifically, in order to avoid the accidental maximum interference in the test operation process of the wheel-rail relationship test bed, the state monitoring module 4 may include a plurality of delay timers, each state parameter corresponding to each monitoring parameter is provided with a delay timer for assisting the monitoring of the limit value, and the delay time of the delay timer may be set as required without limitation. And starting a delay timer when the state parameter of the wheel-rail relation test bed exceeds the warning threshold value. When the delay timer reaches a preset warning delay time, the status monitoring module 4 generates a warning message to notify the staff to process, and at the same time, suspends the delay timer. And restarting the delay timer when the state parameter exceeds the alarm threshold value. And when the delay timer reaches the preset alarm delay time, generating and sending an emergency stop instruction for controlling the wheel-rail relation test bed, and further suspending the test operation of the wheel-rail relation test bed so as to ensure the safety of the test operation.

Fig. 4 is a graph of a state parameter, a timing time of a delay timer, and a warning state corresponding to a monitoring parameter of a control system of a wheel-rail relationship test stand according to an exemplary embodiment of the present application over time.

As shown in fig. 4, a time-dependent change curve of the state parameter corresponding to the monitoring parameter, a time-dependent change curve of the delay timer, and a time-dependent change curve of the warning state are presented. And when the numerical value of the state parameter corresponding to the monitored parameter exceeds the warning or alarm threshold value, starting a delay timer to perform addition timing. And triggering the alarm when the timing time of the delay timer reaches the preset alarm delay time. But remains on for a period of time after the warning is triggered, but does not halt the test run of the wheel-rail relationship test stand. Until the value of the state parameter is below the warning threshold, the warning is removed and the delay time timer is set to zero. If the value of the state parameter still exceeds the warning threshold, the warning is kept active until the value of the state parameter is below the warning threshold and is kept for a period of time, and the warning is cancelled. When the timing time of the delay timer reaches the alarm delay time, the pause timer automatically triggers the emergency stop operation at the same time. If the value of the state parameter drops below the warning threshold or below the warning threshold before the triggering warning delay time or warning delay time is reached, the delay time timer is switched to a subtraction timing until the timing is 0 or the value of the state parameter exceeds the warning threshold again. When the value of the state parameter exceeds the warning threshold or the alarm threshold again, the delay time timer is reset to the addition timing.

According to the wheel-rail relation test bed and the control system thereof, support is provided for the whole process from automatic starting, test to shutdown of the wheel-rail relation test bed through the arrangement of the four functional modules, and the dependence of the whole wheel-rail relation test on personnel is reduced; in addition, a plurality of test process tasks and step calling rules are set through the process control module, so that the requirements of different test working conditions can be met; and by monitoring the state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters, warning information can be provided for a user, or emergency stop treatment can be carried out, and the running safety of the wheel-rail relation test bed can be ensured while the accidental extreme value interference in the running process is avoided.

Fig. 5 is a flowchart of a control method of a wheel-rail relationship test stand according to an exemplary embodiment of the present application. As shown in fig. 5, the present application provides a method for controlling a wheel-rail relationship test bed, which may include: generating a test flow task and a step calling rule for controlling the running of the wheel-rail relation test bed, and issuing the running step of the test flow task to the wheel-rail relation test bed according to the step calling rule, wherein the test flow task comprises a plurality of flow task files, and the flow task files comprise target values of a plurality of control parameters. The target values of the plurality of control parameters are converted into command values of an actuator of the wheel-rail relationship test stand. The state parameters of the wheel-rail relation test stand under the control of the command values of the plurality of control parameters are collected. And generating and sending an emergency stop command for controlling the wheel-rail relation test bed in response to the state parameter exceeding the alarm threshold value.

In some embodiments, the test flow task includes a second flow task file.

In some embodiments, the step call rule comprises a third step call rule.

The control method of the wheel-rail relation test bed is mainly used for supporting each module of the corresponding control system, and specific principles and steps can refer to the control system, which is not described herein again.

According to the control method of the wheel-rail relation test bed, support is provided for the whole process from automatic starting, testing to shutdown of the wheel-rail relation test bed through the arrangement of the four functional modules, and the dependence of the whole wheel-rail relation test on personnel is reduced; in addition, a plurality of test process tasks and step calling rules are set through the process control module, so that the requirements of different test working conditions can be met; and by monitoring the state parameters of the wheel-rail relation test bed under the control of the instruction values of the plurality of control parameters, warning information can be provided for a user, or emergency stop treatment can be carried out, and the running safety of the wheel-rail relation test bed can be ensured while the accidental extreme value interference in the running process is avoided.

The objects, technical solutions and advantageous effects of the present invention are further described in detail with reference to the above-described embodiments. It should be understood that the above description is only a specific embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control system for a wheel and rail relationship test stand, comprising:

the system comprises a flow control module, a wheel-rail relation test bench and a control module, wherein the flow control module is used for generating a test flow task and a step calling rule for controlling the operation of the wheel-rail relation test bench, and issuing the operation step of the test flow task to the wheel-rail relation test bench according to the step calling rule, wherein the test flow task comprises a plurality of flow task files, and the flow task files comprise target values of a plurality of control parameters;

the parameter adjusting module is used for respectively converting the target values of the control parameters into instruction values of an executing mechanism of the wheel-rail relation test bed;

the signal acquisition module is used for acquiring state parameters of the wheel-rail relation test bed under the control of the instruction values of the control parameters; and

and the state monitoring module is used for responding to the state parameters exceeding the alarm threshold value and generating and sending an emergency stop instruction for controlling the wheel-rail relation test bed.

2. The control system of a wheel-rail relationship test stand according to claim 1, wherein the test flow task includes a first flow task file,

the first flow task file records: the method comprises the steps of sequence number, a time switch, a condition switch, a plurality of target values of the control parameters and change rate values of the target values, wherein the time switch comprises the shortest running time and the longest running time, and the condition switch comprises condition reference control parameters, condition judgers, condition values and condition jump targets.

3. The control system of a wheel-rail relationship test stand according to claim 2, wherein the step calling rule includes a first step calling rule,

the first step call rule includes: a running step of triggering the flow control module to issue a condition jump target corresponding to the step sequence number to the wheel-rail relation test stand in response to that the running time of the wheel-rail relation test stand reaches the shortest running time corresponding to the step sequence number and does not exceed the longest running time corresponding to the step sequence number and that the condition reference control parameter corresponding to the step sequence number meets the condition value corresponding to the condition judgment symbol; and

and triggering the flow control module to send the next operation step of the step sequence number to the wheel-rail relation test bed until all operation steps of the first flow task file are completed in response to the fact that the operation time of the wheel-rail relation test bed reaches the longest operation time corresponding to the step sequence number.

4. The control system of a wheel-rail relationship test stand of claim 1, wherein the test flow task includes a second flow task file,

the second process task file records: a time switch, target values of a plurality of said control parameters,

wherein the time switch comprises a plurality of operation moments of the wheel-rail relation test bed, wherein a time interval exists between adjacent operation moments.

5. The control system of a wheel-rail relationship test stand according to claim 4, wherein the step calling rule includes a second step calling rule,

the second step calling rule comprises: and taking the time sequence of the plurality of running moments as the sequence of each running step issued by the flow control module to the wheel-rail relation test bed until all running steps of the second flow task file are completed.

6. A control method of a wheel-rail relation test bed is characterized by comprising the following steps:

generating a test flow task and a step calling rule for controlling the running of the wheel-rail relation test bed, and issuing the running step of the test flow task to the wheel-rail relation test bed according to the step calling rule, wherein the test flow task comprises a plurality of flow task files, and the flow task files comprise target values of a plurality of control parameters;

converting the target values of the control parameters into command values of an executing mechanism of the wheel-rail relation test bed respectively;

collecting state parameters of the wheel-rail relation test bed under the control of command values of a plurality of control parameters; and

and generating and sending an emergency stop instruction for controlling the wheel-rail relation test bed in response to the state parameter exceeding an alarm threshold value.

7. The method of controlling a wheel-rail relation test stand according to claim 6, wherein the test flow task includes a first flow task file,

8. The method for controlling a wheel-rail relationship test stand according to claim 7, wherein the step calling rule includes a first step calling rule,

9. The method of controlling a wheel-rail relationship test stand according to claim 6, wherein the test flow task includes a second flow task file,

10. The method for controlling a wheel-rail relationship test stand according to claim 9, wherein the step calling rule includes a second step calling rule,