阅读说明：本技术 车轮双轴疲劳试验载荷谱的编制方法、电子设备及介质 (Method for compiling load spectrum of wheel biaxial fatigue test, electronic device and medium ) 是由 李旭东 刘振国 田程 张新峰 牛治慧 于 2021-09-08 设计创作，主要内容包括：本发明涉及车轮疲劳试验领域,具体而言,涉及一种车轮双轴疲劳试验载荷谱的编制方法、电子设备及介质。所述编制方法包括：根据车轮实时的径向载荷和侧向载荷,划分多个载荷区间；所述载荷区间是指在一连续行驶时间下,车轮的径向载荷和侧向载荷保持不变的区间,所述载荷区间包括径向载荷、侧向载荷和行驶距离；根据各个载荷区间中的径向载荷、侧向载荷和行驶距离,确定轮毂疲劳损伤数；根据各个载荷区间中的径向载荷、侧向载荷、行驶距离和所述轮毂疲劳损伤数,确定车轮双轴疲劳试验载荷谱。该方法可实现对车轮双轴疲劳试验载荷谱的合理编制以及试验加速。(The invention relates to the field of wheel fatigue tests, in particular to a compilation method, electronic equipment and a medium for a wheel biaxial fatigue test load spectrum. The compiling method comprises the following steps: dividing a plurality of load intervals according to the real-time radial load and the real-time lateral load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and a driving distance; determining the fatigue damage number of the hub according to the radial load, the lateral load and the driving distance in each load interval; and determining a load spectrum of the biaxial fatigue test of the wheel according to the radial load, the lateral load, the driving distance and the fatigue damage number of the hub in each load interval. The method can realize reasonable compilation of the load spectrum of the biaxial fatigue test of the wheel and test acceleration.)

1. A method for compiling a load spectrum of a biaxial fatigue test of a wheel is characterized by comprising the following steps:

dividing a plurality of load intervals according to the real-time radial load and the real-time lateral load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and a driving distance;

determining the fatigue damage number of the hub according to the radial load, the lateral load and the driving distance in each load interval;

and determining a load spectrum of the biaxial fatigue test of the wheel according to the radial load, the lateral load, the driving distance and the fatigue damage number of the hub in each load interval.

2. The programming method according to claim 1, wherein the real-time radial load and lateral load of the wheel are measured by a sextant on a vehicle;

the driving distance is obtained according to the driving speed, the first moment and the second moment;

the first time refers to the starting time of the radial load and the side load which are kept unchanged in the load interval;

the second time refers to the ending time of the radial load and the side load which are kept unchanged in the load interval.

3. The programming method according to claim 1, wherein the determining the number of fatigue damages of the hub according to the radial load, the lateral load and the driving distance in each load interval comprises:

acquiring a fatigue strength index of the hub;

and determining the fatigue damage number of the hub according to the fatigue strength index, the radial load, the lateral load and the driving distance.

4. The programming method according to claim 3, wherein the number of hub fatigue damages is calculated using the following formula:

wherein L is_iDistance traveled for load interval i, F_tiIs the radial load of the load interval i, F_aiThe axial load of the load interval i is obtained; c. C_tAnd c_aTo satisfy any set of parameters of the normalization condition, c_t ²+c_a ²1 is ═ 1; b is fatigue strength index; m is the total number of load intervals.

5. The compilation method according to any one of claims 1 to 4, wherein determining a biaxial fatigue test load spectrum of the wheel based on the radial load, the lateral load, the travel distance and the number of fatigue damages of the hub in each load interval comprises:

determining a plurality of preset load spectrums according to the radial load, the lateral load and the running distance in each load interval; the order of the preset load spectrum is lower than the total number of the load intervals;

and determining a load spectrum of the biaxial fatigue test of the wheel according to each preset load spectrum and the fatigue damage number of the wheel hub.

6. The programming method according to claim 5, wherein the determining a biaxial fatigue test load spectrum of the wheel according to each of the preset load spectrum and the number of fatigue damages of the hub comprises:

and judging the magnitude of each preset load spectrum and the fatigue damage number of the wheel hub, and if the preset load spectrum is greater than or equal to the fatigue damage number of the wheel hub, determining the preset load spectrum as a double-shaft fatigue test load spectrum of the wheel.

7. The utility model provides a weaving device of wheel biax fatigue test load spectrum which characterized in that includes:

the load interval dividing module is used for dividing a plurality of load intervals according to the real-time radial load and the side load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and a driving distance;

the wheel hub fatigue damage number determining module is used for determining the wheel hub fatigue damage number according to the radial load, the lateral load and the driving distance in each load interval;

and the wheel biaxial fatigue test load spectrum determination module is used for determining a wheel biaxial fatigue test load spectrum according to the radial load, the lateral load, the driving distance and the wheel hub fatigue damage number in each load interval.

8. An electronic device, comprising:

at least one processor, and a memory communicatively coupled to at least one of the processors;

wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.

9. A medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 1-6.

Technical Field

The invention relates to the field of wheel fatigue tests, in particular to a compilation method, electronic equipment and a medium for a wheel biaxial fatigue test load spectrum.

Background

The wheel hub is an important part of the vehicle, and the durability and reliability of the wheel hub are directly related to the safety of the vehicle driver and passengers. In order to improve and ensure the durability and reliability of the vehicle hub, a wheel biaxial fatigue test needs to be implemented and developed in vehicle engineering, and fatigue damage accumulated on the wheel hub in the actual running process of a vehicle is reproduced in the test, so that the test examination on the durability and reliability of the wheel hub structure is completed.

However, because the load form borne by the wheel hub is complex in the vehicle driving process, and the accumulation and formation mechanism of the fatigue damage of the wheel hub is complex, a calculation method is always lacked to accurately and objectively describe and quantify the fatigue damage of the wheel hub in the vehicle driving process, and restrictions and obstacles are formed on the reasonable compilation of a wheel biaxial fatigue test load spectrum and the test acceleration.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a method for compiling a load spectrum of a wheel biaxial fatigue test, electronic equipment and a medium, so as to realize reasonable compilation and test acceleration of the load spectrum of the wheel biaxial fatigue test.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a method for compiling a load spectrum of a biaxial fatigue test of a wheel, which comprises the following steps:

dividing a plurality of load intervals according to the real-time radial load and the real-time lateral load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and a driving distance;

determining the fatigue damage number of the hub according to the radial load, the lateral load and the driving distance in each load interval;

and determining a load spectrum of the biaxial fatigue test of the wheel according to the radial load, the lateral load, the driving distance and the fatigue damage number of the hub in each load interval.

In a second aspect, the invention provides a device for compiling a load spectrum of a biaxial fatigue test of a wheel, which comprises:

the load interval dividing module is used for dividing a plurality of load intervals according to the real-time radial load and the side load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and a driving distance;

the wheel hub fatigue damage number determining module is used for determining the wheel hub fatigue damage number according to the radial load, the lateral load and the driving distance in each load interval;

and the wheel biaxial fatigue test load spectrum determination module is used for determining a wheel biaxial fatigue test load spectrum according to the radial load, the lateral load, the driving distance and the wheel hub fatigue damage number in each load interval.

In a third aspect, the present invention provides an electronic device, comprising:

at least one processor, and a memory communicatively coupled to at least one of the processors;

wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method described above.

In a fourth aspect, the present invention provides a medium having stored thereon computer instructions for causing the computer to perform the method described above.

Compared with the prior art, the invention has the beneficial effects that:

the method for compiling the load spectrum of the biaxial fatigue test of the wheel comprises the steps of dividing a plurality of load intervals according to the real-time radial load and the real-time lateral load of the wheel, and carrying out real statistical division on the actual load condition in the running process of the wheel; then, determining the fatigue damage number of the hub according to the radial load, the lateral load and the driving distance in each load interval, wherein the determined fatigue damage number of the hub is accurate and objective; and finally, determining a load spectrum of the wheel biaxial fatigue test according to the radial load, the lateral load, the driving distance and the wheel hub fatigue damage number in each load interval, thereby realizing reasonable compilation of the load spectrum and test acceleration. The method has great significance for improving the durability and reliability of the wheel hub and ensuring the safety of vehicle drivers and passengers; and because the efficiency of the biaxial fatigue test of the wheel is improved due to the accelerated test, the test time is shortened, the test cost and the cost are reduced, and the economic benefit is also great.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow chart of a method for compiling a biaxial fatigue test load spectrum of a wheel according to embodiment 1;

FIG. 2 is a schematic structural diagram of a weaving device for a biaxial fatigue test load spectrum of a wheel provided in example 2;

fig. 3 is a schematic structural diagram of an electronic device provided in embodiment 3.

Detailed Description

The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

Example 1

Fig. 1 is a flowchart of a method for compiling a biaxial fatigue test load spectrum of a wheel according to this embodiment, which may be performed by a device for compiling a biaxial fatigue test load spectrum of a wheel, which may be formed by software and/or hardware and is generally integrated in an electronic device.

Referring to fig. 1, the method comprises the steps of:

s110, dividing a plurality of load intervals according to the real-time radial load and the real-time lateral load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and the driving distance.

Herein, "radial load" refers to a load acting on the tire assembly of the wheel in the radial direction of the wheel. "side load" refers to the load acting on the wheel tire assembly in the direction of the wheel axis. The "travel distance" refers to the distance traveled by the vehicle under the radial and side loads.

Specifically, the real-time radial load and side load of the wheel are measured by a sextant on the vehicle.

Illustratively, the load intervals may be in a three-dimensional array (F)_ti，F_ai，L_i) Wherein i in the subscripts is 1,2, …, n, F_tiFor radial loads F_tNumerical values in the interval i, F_aiFor radial loads F_aNumerical values in the interval i, L_iIs the value of the travel distance L in the interval i. For example, in the continuous time period of 14:00-14:05, the radial load of the wheel is 4500N, the lateral load is 300N, the running distance is 50m, and the load interval is (4500N, 300N, 50 m).

And S120, determining the fatigue damage number of the hub according to the radial load, the lateral load and the running distance in each load interval.

The "number of fatigue damages of the wheel hub" is a measure of the degree of accumulation of fatigue damages of the wheel hub under the combined action of the radial load and the lateral load of the wheel.

Specifically, the running distance is obtained according to a running speed, a first time and a second time;

the first time refers to the starting time of the radial load and the side load which are kept unchanged in the load interval;

the second time refers to the ending time of the radial load and the side load which are kept unchanged in the load interval.

Wherein the distance traveled is obtained from the travel speed, the first time, and the second time, including:

calculating the average speed of the vehicle running between the first time and the second time, and taking the average speed as the running speed; and calculating the difference value between the first moment and the second moment, and multiplying the difference value by the running speed to obtain the running distance.

Illustratively, if the first time is t₁The second time is t₂When the traveling speed is v, the traveling distance is v × (t)₂-t₁)。

Preferably, the determining the number of fatigue damages of the hub according to the radial load, the lateral load and the driving distance in each load interval comprises:

acquiring a fatigue strength index of the hub;

and determining the fatigue damage number of the hub according to the fatigue strength index, the radial load, the lateral load and the driving distance.

Wherein "fatigue strength index" means when the Basquin relation N.S is used^bWhen describing the relation between S (amplitude of stress change) and N (cycle number) in the S-N curve of the material, the value of the material parameter b is expressed. The index can be obtained by looking up a table according to the material of the hub, S-N curves of different materials are obtained through experiments, and the fatigue strength index can be obtained after the curves are fitted.

Preferably, the number of fatigue damages of the hub is calculated by using the following formula:

wherein L is_iDistance traveled for load interval i, F_tiIs the radial load of the load interval i, F_aiThe axial load of the load interval i is obtained; c. C_tAnd c_aTo satisfy normalizationAn arbitrary set of parameters of the condition, c_t ²+c_a ²1 is ═ 1; b is fatigue strength index; m is the total number of load intervals.

The "number of fatigue damages" is not the fatigue damage of the hub, but an intermediate value for calculating the fatigue damage of the final hub, and if the fatigue damage is calculated, the intermediate value is multiplied by a value K on the basis of the number of fatigue damages, and K is related to the stress fluctuation amplitude of the hub, the fatigue strength coefficient, the fatigue strength index, the circumferential length of the wheel, the radial load, and the lateral load. Since K in the actual fatigue strain and K in the fatigue strain corresponding to the load spectrum can be mutually cancelled in the subsequent compilation of the fatigue test load spectrum, K is not reflected in the compilation method of the embodiment.

S130, determining a biaxial fatigue test load spectrum of the wheel according to the radial load, the lateral load, the driving distance and the fatigue damage number of the hub in each load interval.

Preferably, the determining a biaxial fatigue test load spectrum of the wheel according to the radial load, the lateral load, the driving distance and the fatigue damage number of the hub in each load interval comprises the following steps:

determining a plurality of preset load spectrums according to the radial load, the lateral load and the running distance in each load interval; the order of the preset load spectrum is lower than the total number of the load intervals;

and determining a load spectrum of the biaxial fatigue test of the wheel according to each preset load spectrum and the fatigue damage number of the wheel hub.

Wherein "lower" means less than or equal to.

Preferably, the determining a biaxial fatigue test load spectrum of the wheel according to each preset load spectrum and the number of fatigue damages of the hub comprises:

and judging the magnitude of each preset load spectrum and the fatigue damage number of the wheel hub, and if the preset load spectrum is greater than or equal to the fatigue damage number of the wheel hub, determining the preset load spectrum as a double-shaft fatigue test load spectrum of the wheel.

Illustratively, the preset loading spectrum is a p-order spectrum(F_{t_Test_j}，F_{a_Test_j}，L_{Test_j}) In which F is_{t_Test_j}Radial load applied for the jth order spectrum of the predetermined load spectrum, F_{a_Test_j}Side load applied for the jth order spectrum of the predetermined load spectrum, L_{Test_j}And presetting a test distance corresponding to the jth order spectrum in the load spectrum. During the load spectrum preparation process, F is determined within the capability range of the biaxial fatigue testing equipment of the wheel without departing from the actual state that the wheel is loaded during the running process of the vehicle_{t_Test_j}And F_{a_Test_j}Obtaining an acceleration of the test by suitably increasing and/or deleting the radial and lateral loads of lower value, the acceleration principle being a normalization parameter (c) selected for each group_t,c_a) Are all provided with Wherein p is<m (in general), considering the exponential effect brought by b, under the acceleration method and principle of the biaxial fatigue test of the wheel, L is enabled to be_{Test_j}The value of (2) is reduced sharply, thereby ensuring that the test acceleration is realized on the premise of equivalent damage of the wheel hub.

The compilation method of the load spectrum of the biaxial fatigue test of the wheel firstly divides a plurality of load intervals according to the real-time radial load and lateral load of the wheel, and can carry out real statistical division on the actual load condition in the running process of the wheel; then, determining the fatigue damage number of the hub according to the radial load, the lateral load and the driving distance in each load interval, wherein the determined fatigue damage number of the hub is accurate and objective; and finally, determining a load spectrum of the wheel biaxial fatigue test according to the radial load, the lateral load, the driving distance and the wheel hub fatigue damage number in each load interval, thereby realizing reasonable compilation of the load spectrum and test acceleration. The method of the embodiment has great significance for improving the durability and reliability of the wheel hub and ensuring the safety of vehicle drivers and passengers; and because the efficiency of the biaxial fatigue test of the wheel is improved due to the accelerated test, the test time is shortened, the test cost and the cost are reduced, and the economic benefit is also great.

Example 2

Fig. 2 shows that the load spectrum compiling device for the biaxial fatigue test of the wheel provided by the embodiment includes:

the load interval dividing module 101 is used for dividing a plurality of load intervals according to the real-time radial load and the side load of the wheel; the load interval refers to an interval in which the radial load and the lateral load of the wheel are kept unchanged under a continuous driving time, and the load interval comprises the radial load, the lateral load and a driving distance;

the hub fatigue damage number determining module 102 is used for determining the hub fatigue damage number according to the radial load, the lateral load and the driving distance in each load interval;

and the wheel biaxial fatigue test load spectrum determination module 103 is used for determining a wheel biaxial fatigue test load spectrum according to the radial load, the lateral load, the driving distance and the wheel hub fatigue damage number in each load interval.

The device is used for executing the compiling method of the load spectrum of the wheel biaxial fatigue test, and therefore, the device at least has functional modules and beneficial effects corresponding to the method.

Example 3

As shown in fig. 3, the present embodiment provides an electronic apparatus including:

at least one processor; and

a memory communicatively coupled to at least one of the processors; wherein the content of the first and second substances,

the memory stores instructions executable by at least one of the processors to enable the at least one of the processors to perform the method described above. The at least one processor in the electronic device is capable of performing the above method and thus has at least the same advantages as the above method.

Optionally, the electronic device further includes an interface for connecting the components, including a high-speed interface and a low-speed interface. The various components are interconnected using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions for execution within the electronic device, including instructions stored in or on the memory to display Graphical information for a GUI (Graphical User Interface) on an external input/output device, such as a display device coupled to the Interface. In other embodiments, multiple processors and/or multiple buses may be used, along with multiple memories and multiple memories, as desired. Also, multiple electronic devices may be connected, with each device providing portions of the necessary operations (e.g., as a server array, a group of blade servers, or a multi-processor system). In fig. 3, one processor 201 is taken as an example.

The memory 202 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the programming method of the biaxial fatigue test load spectrum of the wheel in the embodiment of the present invention (for example, the load interval division module 101, the hub fatigue damage number determination module 102, and the biaxial fatigue test load spectrum determination module 103 in the programming device of the biaxial fatigue test load spectrum of the wheel). The processor 201 executes software programs, instructions and modules stored in the memory 202 so as to execute various functional applications and data processing of the equipment, namely, the method for making the load spectrum of the biaxial fatigue test of the wheel is realized.

The memory 202 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 202 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 202 may further include memory located remotely from the processor 201, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The electronic device may further include: an input device 203 and an output device 204. The processor 201, the memory 202, the input device 203 and the output device 204 may be connected by a bus or other means, and fig. 3 illustrates the connection by a bus as an example.

The input device 203 may receive input numeric or character information, and the output device 204 may include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), and the like. The display device may include, but is not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, and a plasma display. In some implementations, the display device can be a touch screen.

Example 4

The present embodiment provides a medium having stored thereon computer instructions for causing the computer to perform the method described above. The computer instructions on the medium for causing a computer to perform the method described above thus have at least the same advantages as the method described above.

The medium of the present invention may take the form of any combination of one or more computer-readable media. The medium may be a computer readable signal medium or a computer readable storage medium. The medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF (Radio Frequency), etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present application may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, and the present invention is not limited herein.

The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.