CN116499959B - Brake cable durability test method and device and computer equipment - Google Patents
Brake cable durability test method and device and computer equipment Download PDFInfo
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G01M13/00—Testing of machine parts
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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Abstract
The application relates to a brake cable durability test method, a brake cable durability test device and computer equipment. The method comprises the following steps: mounting a brake cable to be tested on a testing machine; testing the brake cable according to a plurality of preset testing conditions; the testing conditions comprise high and low temperature testing conditions, wherein the high and low temperature testing conditions comprise a temperature cycle preset cycle number threshold value within a preset testing duration range, and the actions of holding and releasing the brake handle corresponding to the brake cable are controlled to reach the preset cycle number threshold value; after the test is finished, if the brake cable meets the preset requirement, the durability test of the brake cable is qualified. The high-low temperature test comprises the temperature cycle times and specific brake cable loosening and holding actions, so that the actual scene is more approximated. Thus, a more accurate test result can be obtained.
Description
Technical Field
The application relates to the technical field of electric vehicles, in particular to a brake cable durability test method, a brake cable durability test device, computer equipment, a storage medium and a computer program product.
Background
The use environment of the shared electric vehicle is far worse than that of the traditional household or commercial type, for example, the shared electric vehicle is often subjected to environmental tests in various areas such as wind blowing, sun drying, rain, high/low temperature, water soaking, salt fog and the like. And the brake cable of the electric vehicle directly influences the braking performance of the vehicle and is important to the safety of the vehicle. In the related art, a conventional durability test method of the electric vehicle brake cable is adopted, so that a test result is not accurate enough.
Disclosure of Invention
Based on this, it is necessary to provide a brake cable durability test method, apparatus, computer device, computer readable storage medium and computer program product in view of the above technical problems.
In a first aspect, the application provides a brake cable durability test method. The method comprises the following steps:
mounting a brake cable to be tested on a testing machine;
testing the brake cable according to a plurality of preset testing conditions; the testing conditions comprise high and low temperature testing conditions, wherein the high and low temperature testing conditions comprise a temperature cycle preset cycle number threshold value within a preset testing duration range, and the actions of holding and releasing the brake handle corresponding to the brake cable are controlled to reach the preset cycle number threshold value;
after the test is finished, if the brake cable meets the preset requirement, the durability test of the brake cable is qualified.
In one possible implementation manner, the obtaining manner of the preset cycle number threshold value includes:
acquiring the target service life of a vehicle to which the brake cable is applied;
determining an initial cycle number threshold according to the target service life;
and correcting the initial cycle number threshold according to the endurance life test model coefficient to obtain a preset cycle number threshold, wherein the endurance life test model coefficient is generated according to historical brake cable use data and a probability density distribution function.
In one possible implementation manner, the endurance life test model coefficient is generated according to historical brake cable usage data and a probability density distribution function, and includes:
inputting historical brake cable usage data into a probability density distribution function, and outputting probability values of the usage data;
and determining probability density according to a probability interval corresponding to a preset probability value and a total probability interval, and determining the durable life test model coefficient as the probability density.
In one possible implementation manner, correcting the initial cycle number threshold according to the endurance life test model coefficient to obtain a preset cycle number threshold includes:
acquiring the temperature difference between a highest temperature threshold and a lowest temperature threshold in the test process environment and the average temperature difference of the positions of the brake cables;
determining a strain fatigue acceleration factor according to the temperature difference and the average temperature difference;
and correcting the initial cycle number threshold according to the strain fatigue acceleration factor and the endurance life test model coefficient to obtain a preset cycle number threshold.
In one possible implementation, the test conditions further include at least one of:
UV irradiation test conditions: drying, spraying and condensing until the corresponding preset test duration is reached;
rain test conditions: the method comprises the steps of spraying water in a spraying test box for a preset time period;
salt spray test conditions: the method comprises the step of testing a preset time period at a preset pH value, a preset salt spray precipitation amount and a preset salt spray box temperature by using a sodium chloride solution.
In a second aspect, the application further provides a brake cable durability testing device. The device comprises:
the mounting module is used for mounting the brake cable to be tested on the testing machine;
the test module is used for respectively testing the brake cable according to a plurality of preset test conditions; the testing conditions comprise high and low temperature testing conditions, wherein the high and low temperature testing conditions comprise a temperature cycle preset cycle number threshold value within a preset testing duration range, and the actions of holding and releasing the brake handle corresponding to the brake cable are controlled to reach the preset cycle number threshold value;
and the verification module is used for judging whether the durability test of the brake cable is qualified if the brake cable meets the preset requirement after the test is finished.
In one possible implementation, the method further includes:
the acquisition module is used for acquiring the target service life of the vehicle to which the brake cable is applied;
the determining module is used for determining an initial cycle number threshold according to the target service life;
the correction module is used for correcting the initial cycle frequency threshold value according to the durable service life test model coefficient to obtain a preset cycle frequency threshold value, wherein the durable service life test model coefficient is generated according to historical brake line use data and a probability density distribution function.
In one possible implementation, the correction module includes:
the output sub-module inputs the historical brake cable usage data into a probability density distribution function and outputs a probability value of the usage data;
and the determining submodule is used for determining probability density according to a probability interval corresponding to a preset probability value and a total probability interval and determining the durable life test model coefficient as the probability density.
In one possible implementation, the determining submodule includes:
the acquisition unit is used for acquiring the temperature difference between the highest temperature threshold and the lowest temperature threshold in the test process environment and the average temperature difference of the positions of the brake cables;
a determining unit for determining a strain fatigue acceleration factor according to the temperature difference and the average temperature difference;
and the correction unit is used for correcting the initial cycle number threshold according to the strain fatigue acceleration factor and the endurance life test model coefficient to obtain a preset cycle number threshold.
In one possible implementation, the test conditions further include at least one of:
UV irradiation test conditions: drying, spraying and condensing until the corresponding preset test duration is reached;
rain test conditions: the method comprises the steps of spraying water in a spraying test box for a preset time period;
salt spray test conditions: the method comprises the step of testing a preset time period at a preset pH value, a preset salt spray precipitation amount and a preset salt spray box temperature by using a sodium chloride solution.
In a third aspect, the present application also provides a computer device. The computer device includes a memory storing a computer program and a processor that when executed implements a brake cable durability test method according to any one of the embodiments of the present disclosure.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium has stored thereon a computer program which when executed by a processor implements a brake cable durability test method according to any one of the embodiments of the present disclosure.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which when executed by a processor implements the brake cable durability test method according to any one of the embodiments of the present disclosure.
The brake cable durability test method, the brake cable durability test device, the computer equipment, the storage medium and the computer program product. The brake cable is tested under various testing conditions, so that the service environment of the outdoor vehicle can be accurately simulated. The high-low temperature test is included in the various test conditions, and the high-low temperature test includes the temperature cycle times and specific brake cable loosening and holding actions, so that the actual scene is more approximated. Thus, a more accurate test result can be obtained.
Drawings
FIG. 1 is a diagram of an application environment of a brake cable durability test method according to one embodiment;
FIG. 2 is a schematic diagram illustrating a first process of a brake cable durability test method according to one embodiment;
FIG. 3 is a schematic illustration of a second process of a brake cable durability test method according to another embodiment;
FIG. 4 is a graph of the probability of output of a brake cable durability test method durability life test model according to one embodiment;
FIG. 5 is a block diagram of a brake cable durability testing apparatus in one embodiment;
FIG. 6 is an internal block diagram of a computer device in one embodiment;
fig. 7 is an internal structural view of a computer device in another embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The method for testing the durability of the brake cable, provided by the embodiment of the application, can be applied to an application environment shown in fig. 1. Wherein, various test conditions, such as UV irradiation conditions, high and low temperature test conditions, etc., can be performed in the comprehensive environmental test chamber 100 of fig. 1. The brake cable is arranged on the testing machine 105, one end of the brake cable is driven to reciprocate by the motor 106 and the cam rotating mechanism, one end of the brake cable carries the weight 108, and the reciprocating motion of the brake cable drives the brake cable 103 to move. Simulating the number of times the brake lever 101 is gripped and released.
In one embodiment, as shown in fig. 2, a brake cable durability test method is provided, comprising the steps of:
step S201, the brake cable to be tested is installed on a testing machine.
Specifically, the brake cable may include a brake cable of a shared electric vehicle, or may include a brake cable of a shared bicycle, which is not limited in this disclosure. In an exemplary embodiment, the brake cable may be mounted on the testing machine shown in FIG. 1. In another exemplary embodiment, the brake cable may be installed in other test environments, so long as the test conditions defined in the embodiments of the present disclosure can be provided, which are all within the scope of the embodiments of the present disclosure.
Step S203, testing the brake cable according to a plurality of preset testing conditions; the testing conditions comprise high and low temperature testing conditions, the high and low temperature testing conditions comprise a temperature cycle preset cycle time threshold value within a preset testing duration range, and the brake handle corresponding to the brake cable is controlled to execute the holding and releasing actions to the preset cycle time threshold value.
Specifically, the preset plurality of test conditions may include a plurality of types, including but not limited to: high and low temperature test conditions, UV irradiation test conditions, rain test conditions, salt spray test conditions, and the like. The high-low temperature test conditions comprise a preset cycle number threshold value of temperature cycle in a preset test duration range, and the brake handle corresponding to the brake cable is controlled to execute the actions of holding and releasing to the preset cycle number threshold value.
In the embodiment of the disclosure, the preset test duration in the high-low temperature test condition is related to the target service life of the vehicle corresponding to the test line, wherein the longer the target service life is, the longer the test duration is. The temperature cycle refers to that the temperature in the test environment is reduced from the highest temperature threshold to the lowest temperature threshold and returns to the highest temperature threshold in unit time, or is increased from the lowest temperature threshold to the highest temperature threshold and returns to the lowest temperature threshold. The preset cycle number threshold is related to the target service life of the vehicle corresponding to the brake cable. In the embodiment of the disclosure, the brake holding and releasing corresponding to the brake cable can calculate one action or two actions, and the disclosure is not limited to the one action, and when the brake holding and releasing calculate one action, the corresponding preset cycle number threshold is 1/2 of the preset cycle number threshold for calculating the two actions.
Step S205, after the test is finished, if the brake cable meets the preset requirement, the durability test of the brake cable is qualified.
Specifically, after the test according to the above test conditions is finished, the brake lever can meet one or more of the following preset requirements, and the brake cable durability test is qualified, for example: the brake cable can be quickly reset, the phenomena of obvious blocking, abnormal sound and the like are avoided, the steel wire rope connector is not fallen off, and each strand of steel wire is not broken. In another exemplary embodiment, if the brake cable does not meet at least one of the preset conditions, the durability test of the brake cable is failed.
In the embodiment, the brake cable is tested under various testing conditions, so that the service environment of the outdoor vehicle can be accurately simulated. The high-low temperature test is included in the various test conditions, and the high-low temperature test includes the temperature cycle times and specific brake cable loosening and holding actions, so that the actual scene is more approximated. Thus, a more accurate test result can be obtained.
In a possible implementation manner, referring to fig. 3, the obtaining manner of the preset cycle number threshold includes:
step S301, obtaining the target service life of a vehicle to which the brake cable is applied;
step S303, determining an initial cycle number threshold according to the target service life;
and step S305, correcting the initial cycle number threshold according to the durable service life test model coefficient to obtain a preset cycle number threshold, wherein the durable service life test model coefficient is generated according to historical brake line use data and a probability density distribution function.
In particular, the target useful life may include 4 years, 6 years, 8 years, or the like. In an exemplary embodiment, determining the initial cycle number threshold based on the target lifetime may include: initial cycle number threshold = cycle number per day x 365 (days) x target life (years), for example initial cycle number threshold = 2 x 365 x 4 = 2920 times. In an exemplary embodiment, the lifetime may also be combined with a target operating time or a target mileage of the application vehicle to determine an initial cycle number threshold, for example 4000h for a target operating hour, 60000h for a target mileage.
In the embodiment of the disclosure, the endurance life test model coefficient is generated according to historical brake cable use data and a probability density distribution function. Because all the historical brake line use data cannot be obtained, the actual integral historical brake line use data is estimated through the sample historical brake line use data and the probability density distribution function, and the relationship between the sample historical brake line use data and the probability density distribution function can be represented by the durability life test model coefficient. In an exemplary embodiment, the durability life test model coefficient is multiplied by the initial environmental number threshold to correct the initial cycle number threshold, thereby reducing the deviation between a brake cable and a batch of brake cables produced as a whole, and accurately reflecting the durability of the brake cables produced as a whole.
In one possible implementation manner, the endurance life test model coefficient is generated according to historical brake cable usage data and a probability density distribution function, and includes:
inputting historical brake cable usage data into a probability density distribution function, and outputting probability values of the usage data;
and determining probability density according to a probability interval corresponding to a preset probability value and a total probability interval, and determining the durable life test model coefficient as the probability density.
Specifically, a endurance life test model is built, e.g., y=f(X 1 ,X 2 ,X 3 …X N ) Output quantity X i Obeys normal distribution, X i Is the best estimate X of (2) i =0, standard uncertainty:. Wherein X is i The brake grasping and releasing action times in the historical brake cable use data are represented. When different test times are taken, the results obtained are consistent within numerical tolerances, e.g. y=0.0,/respectively>. Referring to FIG. 4, the predetermined probability (e.g., 95%) includes an interval of [ -3.94,3.92]Wherein when the action number m=10 5 The corresponding probability interval is as follows:
TABLE 1 each X i Results of model application following normal too distribution
Probability densityWherein->For the preset probability symmetry inclusion interval, N is the total inclusion interval, in the above embodiment, < +.>C= 1.768. Among them, MCM (Monte Carlo method ), a method of random sampling by probability distribution for distribution propagation.
The embodiment of the disclosure provides a durable life test model coefficient, and the coefficient is used for correcting an initial cycle number threshold value, so that the deviation between a certain brake cable and a batch of brake cables produced integrally can be reduced, and the durability of the integrally generated brake cables can be accurately reflected.
Referring to fig. 4, the step of correcting the initial cycle number threshold according to the endurance life test model coefficient to obtain a preset cycle number threshold includes:
acquiring the temperature difference between a highest temperature threshold and a lowest temperature threshold in the test process environment and the average temperature difference of the positions of the brake cables;
determining a strain fatigue acceleration factor according to the temperature difference and the average temperature difference;
and correcting the initial cycle number threshold according to the strain fatigue acceleration factor and the endurance life test model coefficient to obtain a preset cycle number threshold.
Specifically, the temperature difference between the maximum temperature threshold and the minimum temperature threshold， />Wherein, the method comprises the steps of, wherein,representing a maximum temperature threshold, e.g. 85 ℃, ->Representing the temperature difference between the lowest temperature threshold, e.g. -20 ℃, the highest temperature threshold and the lowest temperature threshold +.>. Average temperature difference of the position of the brake cable>For example 40 ℃. In an exemplary embodiment, the strain fatigue acceleration factor is the acceleration factor of the Coffin-manson model, and therefore the strain fatigue acceleration factor +.>Wherein c is a fixed value of 2.5. Correcting the initial cycle number threshold according to the strain fatigue acceleration factor, including dividing the initial cycle number threshold by strain fatigue accelerationAnd (3) obtaining a middle cycle number threshold value by using the factor, and multiplying the middle cycle number threshold value by a durable life test model coefficient to obtain a preset cycle number threshold value.
According to the embodiment of the disclosure, the durability performance of the brake cable is reduced along with the increase of time, and the part of the content needs to be simulated into the test condition, so that the initial cycle number threshold is corrected by using the strain fatigue acceleration factor and the durable life test model coefficient, a more accurate preset cycle number threshold can be obtained, and the test accuracy can be improved.
In one possible implementation, the test conditions further include at least one of:
UV irradiation test conditions: drying, spraying and condensing until the corresponding preset test duration is reached;
rain test conditions: the method comprises the steps of spraying water in a spraying test box for a preset time period;
salt spray test conditions: the method comprises the step of testing a preset time period at a preset pH value, a preset salt spray precipitation amount and a preset salt spray box temperature by using a sodium chloride solution.
In particular, UV irradiation test conditions may include, for example: the UVA-340 lamp tube is selected, the condition is set to 8 hours of drying, 0.25 hours of spraying and 3.75 hours of condensation. And the irradiation intensity is 0.76W/m < 2 >, the irradiation power is @340nm and the test time is 600h. The rain test conditions may include, for example; the water spray test was carried out in a water spray test chamber for 3 hours. Wherein h represents hours. The salt spray test conditions may include, for example: solution concentration (50.+ -.5) g/L sodium chloride solution, pH:6.5-7.2, the precipitation amount of salt fog is 1-mL/80cm < 2 >/h, the temperature of a salt fog box is 35+/-2 ℃, and the temperature of a saturated barrel is 47+/-2 ℃; 96. hours. The specific threshold value of each condition can be set according to the application scenario, and the disclosure is not limited to this.
The application adopts various test conditions to test the brake cable, wherein the test comprises high and low temperature tests, and the test comprises temperature cycle times and specific brake cable loosening and holding actions, which are approximate to the actual scene. And a more accurate test result can be obtained.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a brake cable durability testing device for realizing the brake cable durability testing method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation of the embodiment of the device for testing durability of a brake cable provided below may be referred to the limitation of the method for testing durability of a brake cable hereinabove, and will not be repeated here.
In one embodiment, as shown in FIG. 5, there is provided a brake cable durability testing device 500 comprising:
the mounting module 501 is used for mounting the brake cable to be tested on the testing machine;
the test module 503 is configured to test the brake cable according to a plurality of preset test conditions; the testing conditions comprise high and low temperature testing conditions, wherein the high and low temperature testing conditions comprise a temperature cycle preset cycle number threshold value within a preset testing duration range, and the actions of holding and releasing the brake handle corresponding to the brake cable are controlled to reach the preset cycle number threshold value;
and the verification module 505 is configured to, after the test is finished, pass the durability test of the brake cable if the brake cable meets a preset requirement.
In one possible implementation, the method further includes:
the acquisition module is used for acquiring the target service life of the vehicle to which the brake cable is applied;
the determining module is used for determining an initial cycle number threshold according to the target service life;
the correction module is used for correcting the initial cycle frequency threshold value according to the durable service life test model coefficient to obtain a preset cycle frequency threshold value, wherein the durable service life test model coefficient is generated according to historical brake line use data and a probability density distribution function.
In one possible implementation, the correction module includes:
the output sub-module inputs the historical brake cable usage data into a probability density distribution function and outputs a probability value of the usage data;
and the determining submodule is used for determining probability density according to a probability interval corresponding to a preset probability value and a total probability interval and determining the durable life test model coefficient as the probability density.
In one possible implementation, the determining submodule includes:
the acquisition unit is used for acquiring the temperature difference between the highest temperature threshold and the lowest temperature threshold in the test process environment and the average temperature difference of the positions of the brake cables;
a determining unit for determining a strain fatigue acceleration factor according to the temperature difference and the average temperature difference;
and the correction unit is used for correcting the initial cycle number threshold according to the strain fatigue acceleration factor and the endurance life test model coefficient to obtain a preset cycle number threshold.
In one possible implementation, the test conditions further include at least one of:
UV irradiation test conditions: drying, spraying and condensing until the corresponding preset test duration is reached;
rain test conditions: the method comprises the steps of spraying water in a spraying test box for a preset time period;
salt spray test conditions: the method comprises the step of testing a preset time period at a preset pH value, a preset salt spray precipitation amount and a preset salt spray box temperature by using a sodium chloride solution.
The above-mentioned brake cable durability test device may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used to store brake cable durability tests. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by a processor implements a brake cable durability test method.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor implements a brake cable durability test method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 7 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (6)
1. A method for testing durability of a brake cable, the method comprising:
mounting a brake cable to be tested on a testing machine;
testing the brake cable according to a plurality of preset testing conditions; the testing conditions comprise high and low temperature testing conditions, wherein the high and low temperature testing conditions comprise a temperature cycle preset cycle number threshold value within a preset testing duration range, and the actions of holding and releasing the brake handle corresponding to the brake cable are controlled to reach the preset cycle number threshold value; the obtaining mode of the preset cycle time threshold value comprises the following steps: acquiring the target service life of a vehicle to which the brake cable is applied; determining an initial cycle number threshold according to the target service life; correcting the initial cycle number threshold according to the endurance life test model coefficient to obtain a preset cycle number threshold, wherein the obtaining mode of the endurance life test model coefficient comprises the following steps: inputting historical brake cable usage data into a probability density distribution function, and outputting probability values of the usage data; determining probability density according to a probability interval corresponding to a preset probability value and a total probability interval, and determining a durable life test model coefficient as the probability density;
after the test is finished, if the brake cable meets the preset requirement, the durability test of the brake cable is qualified.
2. The method of claim 1, wherein modifying the initial cycle number threshold based on the endurance life test model coefficients to obtain a preset cycle number threshold comprises:
acquiring the temperature difference between a highest temperature threshold and a lowest temperature threshold in the test process environment and the average temperature difference of the positions of the brake cables;
determining a strain fatigue acceleration factor according to the temperature difference and the average temperature difference;
and correcting the initial cycle number threshold according to the strain fatigue acceleration factor and the endurance life test model coefficient to obtain a preset cycle number threshold.
3. The method of claim 1 or 2, wherein the test conditions further comprise at least one of:
UV irradiation test conditions: drying, spraying and condensing until the corresponding preset test duration is reached;
rain test conditions: the method comprises the steps of spraying water in a spraying test box for a preset time period;
salt spray test conditions: the method comprises the step of testing a preset time period at a preset pH value, a preset salt spray precipitation amount and a preset salt spray box temperature by using a sodium chloride solution.
4. A brake cable durability testing apparatus, the apparatus comprising:
the acquisition module is used for acquiring the target service life of the vehicle to which the brake cable is applied;
the determining module is used for determining an initial cycle number threshold according to the target service life;
the correction module is used for correcting the initial cycle number threshold value according to the durable service life test model coefficient to obtain a preset cycle number threshold value, wherein the durable service life test model coefficient is generated according to historical brake line use data and a probability density distribution function; wherein, the correction module includes: the output sub-module inputs the historical brake cable usage data into a probability density distribution function and outputs a probability value of the usage data; the determining submodule is used for determining probability density according to a probability interval corresponding to a preset probability value and a total probability interval and determining a durable life test model coefficient as the probability density;
the mounting module is used for mounting the brake cable to be tested on the testing machine;
the test module is used for respectively testing the brake cable according to a plurality of preset test conditions; the testing conditions comprise high and low temperature testing conditions, wherein the high and low temperature testing conditions comprise a temperature cycle preset cycle number threshold value within a preset testing duration range, and the actions of holding and releasing the brake handle corresponding to the brake cable are controlled to reach the preset cycle number threshold value;
and the verification module is used for judging whether the durability test of the brake cable is qualified if the brake cable meets the preset requirement after the test is finished.
5. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the brake cable durability test method of any one of claims 1 to 3.
6. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the brake cable durability test method of any one of claims 1 to 3.
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