CN116337484B - Drive axle endurance test method, system, computer and readable storage medium - Google Patents
Drive axle endurance test method, system, computer and readable storage medium Download PDFInfo
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- CN116337484B CN116337484B CN202310619473.9A CN202310619473A CN116337484B CN 116337484 B CN116337484 B CN 116337484B CN 202310619473 A CN202310619473 A CN 202310619473A CN 116337484 B CN116337484 B CN 116337484B
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Abstract
The invention provides a method, a system, a computer and a readable storage medium for durability test of a drive axle, wherein the method comprises the following steps: when a test vehicle is detected, a power assembly model and an energy management control model corresponding to the current test vehicle are constructed, and whole vehicle dynamics simulation is carried out according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle; and constructing a drive axle bench test working condition matched with the test vehicle according to the target working condition, and completing the drive axle endurance test of the test vehicle through the drive axle bench test working condition. Through the mode, the problem that the strength design of the transmission part in the drive axle is insufficient or over-designed can be effectively avoided, and meanwhile, the problem that the designed test working condition is inconsistent with the actual condition of the vehicle and causes unconventional failure can be avoided.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a system for testing durability of a drive axle, a computer and a readable storage medium.
Background
Along with the progress of science and technology and the rapid development of productivity, automobiles are popularized in daily life of people, and become one of the indispensable transportation means for daily travel of people, so that the travel efficiency of people is greatly improved, and the life of people is facilitated.
The drive axle is one of important parts of the automobile and is used for transmitting the torque of the motor to the wheel end of the automobile so as to realize the driving of the automobile. Prior drive axles have required durability tests prior to shipment to verify the durability of the gears in the drive axles. In the prior art, the durability test is directly carried out on the drive axle according to the existing national standard, and the durable working condition of the gears in the drive axle is obtained to be irrelevant to parameters such as motor torque, motor power, battery capacity and the like matched with the vehicle.
However, the load conditions generated by different motors and batteries on the drive axle in the same vehicle are different, so that larger errors can be generated on the test torque of the durable condition of the drive axle, the test result of the drive axle can be influenced, and certain potential safety hazards exist.
Disclosure of Invention
Based on the above, the invention aims to provide a method, a system, a computer and a readable storage medium for endurance test of a driving axle, so as to solve the problem that the test torque of the endurance working condition of the driving axle generates larger error in the prior art, thereby influencing the test result of the driving axle.
An embodiment of the present invention provides a driving axle endurance test method, where the method includes:
when a test vehicle is detected, a power assembly model and an energy management control model corresponding to the current test vehicle are constructed, and whole vehicle dynamics simulation is carried out according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle;
and constructing a drive axle bench test working condition matched with the test vehicle according to the target working condition, and completing the drive axle endurance test of the test vehicle through the drive axle bench test working condition.
The beneficial effects of the invention are as follows: when a test vehicle is detected, a power assembly model and an energy management control model corresponding to the current test vehicle are constructed, and whole vehicle dynamics simulation is carried out according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle; and finally, constructing a drive axle bench test working condition matched with the test vehicle according to the target working condition, and completing the drive axle endurance test of the test vehicle through the drive axle bench test working condition. The test working condition of the driving axle bench generated in the mode can be considered to be durable and damaged, the problem that the strength design of a transmission part in a driving axle is insufficient or over-designed can be effectively avoided, meanwhile, the designed test working condition is not consistent with the actual condition of a vehicle, the problem of unconventional failure is caused, and the durability of the driving axle can be comprehensively and effectively verified.
Preferably, the step of performing a vehicle dynamics simulation according to the powertrain model and the energy management control model based on preset requirements to extract a target working condition corresponding to a drive axle in the test vehicle includes:
when the power assembly model and the energy management control model are acquired, carrying out the whole vehicle dynamics simulation on a power system in the test vehicle based on a preset endurance specification through the power assembly model and the energy management control model, wherein the power system comprises the drive axle;
and acquiring a simulation result of the whole vehicle dynamics simulation, and extracting a target working condition corresponding to the driving axle according to the simulation result, wherein the simulation result comprises a torque signal and a rotating speed signal of the driving axle.
Preferably, the step of extracting the target working condition corresponding to the driving axle according to the simulation result includes:
performing discrete processing on the torque signal and the rotating speed signal to split the torque signal and the rotating speed signal into a plurality of corresponding segmented data signals, wherein the segmented data signals comprise separation frequency and separation time;
And counting the target rotating speed and the target circulation times corresponding to each torque segment signal in the segmented data signals, and forming RAL working conditions in the target working conditions according to the torque segment signals, the target rotating speed and the target circulation times.
Preferably, the step of extracting the target working condition corresponding to the driving axle according to the simulation result includes:
extracting a plurality of torque signals in the simulation result;
and counting a plurality of torque fatigue rings in the torque signals according to a rain flow counting method, wherein the torque fatigue rings comprise torque amplitude, torque average value and cycle number information, and generating RFM working conditions in the target working conditions according to the torque amplitude, the torque average value and the cycle number.
Preferably, the step of constructing a driving axle bench test condition adapted to the test vehicle according to the target condition includes:
when the RAL working condition is obtained, detecting a driving gear contained in the driving axle, and calculating bending stress and contact stress between the driving gears according to each torque section signal;
calculating the bending fatigue damage and the contact fatigue damage of the gear in single cycle of each torque section signal according to the bending fatigue SN curve and the contact fatigue SN curve of the driving gear, and calculating the corresponding bending fatigue damage value of the gear, the reverse dragging bending fatigue damage value of the gear, the contact fatigue damage value of the gear and the reverse dragging contact fatigue damage value of the gear according to the cycle times corresponding to each torque section signal;
Setting the gear driving bending fatigue damage value, the gear anti-dragging bending fatigue damage value, the gear driving contact fatigue damage value and the gear anti-dragging contact fatigue damage value as endurance target values of the RAL working conditions, and generating RAL endurance test working conditions suitable for a drive axle rack according to the endurance target values.
Preferably, after the step of generating the RAL endurance test condition applicable to the drive axle bench according to the endurance target value, the method further includes:
when the RAL endurance test working condition is obtained, detecting an input shaft spline in the drive axle, and calculating a target damage value of the RFM working condition to the input shaft spline; setting the target damage value as a durability target value of the RFM working condition, and extracting a maximum driving torque and a minimum driving torque from the RAL durability test working condition;
setting the maximum driving torque and the minimum driving torque as single RFM working conditions, and calculating a single damage value of the single RFM working conditions to the input shaft spline so as to obtain target cycle times of the single RFM working conditions according to the single damage value.
Preferably, after the step of obtaining the target cycle number of the single RFM working condition according to the single damage value, the method further includes:
and calculating the target cycle times of the single RFM working condition according to the target damage value and the single damage value, and testing the RAL endurance test working condition according to the target cycle times to construct the drive axle stand test working condition, wherein the drive axle stand test working condition comprises RFM working condition target endurance damage and RAL working condition target endurance damage.
A second aspect of an embodiment of the present invention provides a drive axle endurance test system, the system including:
the simulation module is used for constructing a power assembly model and an energy management control model corresponding to the current test vehicle when the test vehicle is detected, and carrying out whole vehicle dynamics simulation according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle;
the working condition design module is used for constructing a driving axle bench test working condition matched with the test vehicle according to the target working condition and completing the driving axle endurance test of the test vehicle through the driving axle bench test working condition.
In the driving axle endurance test system, the simulation module is specifically configured to:
when the power assembly model and the energy management control model are acquired, carrying out the whole vehicle dynamics simulation on a power system in the test vehicle based on a preset endurance specification through the power assembly model and the energy management control model, wherein the power system comprises the drive axle;
and acquiring a simulation result of the whole vehicle dynamics simulation, and extracting a target working condition corresponding to the driving axle according to the simulation result, wherein the simulation result comprises a torque signal and a rotating speed signal of the driving axle.
In the above-mentioned driving axle endurance test system, the simulation module is further specifically configured to:
performing discrete processing on the torque signal and the rotating speed signal to split the torque signal and the rotating speed signal into a plurality of corresponding segmented data signals, wherein the segmented data signals comprise separation frequency and separation time;
and counting the target rotating speed and the target circulation times corresponding to each torque segment signal in the segmented data signals, and forming RAL working conditions in the target working conditions according to the torque segment signals, the target rotating speed and the target circulation times.
In the above-mentioned driving axle endurance test system, the simulation module is further specifically configured to:
extracting a plurality of torque signals in the simulation result;
and counting a plurality of torque fatigue rings in the torque signals according to a rain flow counting method, wherein the torque fatigue rings comprise torque amplitude, torque average value and cycle number information, and generating RFM working conditions in the target working conditions according to the torque amplitude, the torque average value and the cycle number.
In the driving axle endurance test system, the working condition design module is specifically configured to:
when the RAL working condition is obtained, detecting a driving gear contained in the driving axle, and calculating bending stress and contact stress between the driving gears according to each torque section signal;
calculating the bending fatigue damage and the contact fatigue damage of the gear in single cycle of each torque section signal according to the bending fatigue SN curve and the contact fatigue SN curve of the driving gear, and calculating the corresponding bending fatigue damage value of the gear, the reverse dragging bending fatigue damage value of the gear, the contact fatigue damage value of the gear and the reverse dragging contact fatigue damage value of the gear according to the cycle times corresponding to each torque section signal;
Setting the gear driving bending fatigue damage value, the gear anti-dragging bending fatigue damage value, the gear driving contact fatigue damage value and the gear anti-dragging contact fatigue damage value as endurance target values of the RAL working conditions, and generating RAL endurance test working conditions suitable for a drive axle rack according to the endurance target values.
Among the above-mentioned transaxle endurance test system, transaxle endurance test system still includes first processing module, first processing module is specifically used for:
when the RAL endurance test working condition is obtained, detecting an input shaft spline in the drive axle, and calculating a target damage value of the RFM working condition to the input shaft spline; setting the target damage value as a durability target value of the RFM working condition, and extracting a maximum driving torque and a minimum driving torque from the RAL durability test working condition;
setting the maximum driving torque and the minimum driving torque as single RFM working conditions, and calculating a single damage value of the single RFM working conditions to the input shaft spline so as to obtain target cycle times of the single RFM working conditions according to the single damage value.
Among the above-mentioned transaxle endurance test system, transaxle endurance test system still includes second processing module, second processing module specifically is used for:
and calculating the target cycle times of the single RFM working condition according to the target damage value and the single damage value, and testing the RAL endurance test working condition according to the target cycle times to construct the drive axle stand test working condition, wherein the drive axle stand test working condition comprises RFM working condition target endurance damage and RAL working condition target endurance damage.
A third aspect of an embodiment of the present invention proposes a computer comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the drive axle endurance test method as described above when executing the computer program.
A fourth aspect of the embodiments of the present invention proposes a readable storage medium having stored thereon a computer program which, when executed by a processor, implements a drive axle endurance test method as described above.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for testing durability of a drive axle according to a first embodiment of the present invention;
FIG. 2 is a single endurance condition loading sequence chart in a driving axle endurance test method according to a second embodiment of the present invention;
fig. 3 is a block diagram of a driving axle endurance test system according to a third embodiment of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a driving axle endurance test method according to a first embodiment of the present invention is shown, where multiple endurance injuries can be considered, and the problem of insufficient or over-designed strength design of a transmission component in a driving axle can be effectively avoided, and meanwhile, the problem of unconventional failure caused by inconsistent designed test working conditions and actual conditions of a vehicle can be avoided, so that the endurance capability of the driving axle can be comprehensively and effectively verified.
Specifically, the driving axle endurance test method provided in this embodiment specifically includes the following steps:
step S10, when a test vehicle is detected, a power assembly model and an energy management control model corresponding to the current test vehicle are constructed, and whole vehicle dynamics simulation is carried out according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle;
Specifically, in this embodiment, it should be firstly explained that the driving axle endurance test method provided in this embodiment is specifically applied to the technical field of new energy automobiles, and is used for performing a endurance test on a driving axle inside the new energy automobile, so as to ensure the quality of the new energy automobile.
In addition, in this embodiment, it should be noted that, in the process that the driving axle is used to transmit the torque output by the motor to the wheel end during the operation, in this process, the working condition of the driving axle is mainly classified into two types according to the stress analysis and the failure mode in the driving axle, one of the two types is the working condition related to the magnitude of the input torque, that is, the RAL (Rotation As Load) working condition, for example, the pulse stress generated by the meshing of the gears is only related to the torque input by the driving axle, and each tooth of the input shaft gear generates one pulse stress after one rotation of the input shaft. The other working condition is related to the change process of the input torque, such as an input shaft spline, a half shaft flange and the like in the driving axle, and if the input torque of the driving axle is constant in the working process, and the input shaft rotates for one circle, the stress of the corresponding spline is constant, so that the stress fluctuation is not generated, the durability damage of the driving axle cannot be accurately verified by adopting the constant input torque, and based on the fact, the change process of the input torque, namely RFM (Rainflow Matrix) working condition, needs to be counted, and the durability performance of the driving axle can be accurately verified only by comprehensively considering the two working conditions.
Based on this, when the test vehicle is detected in real time in this step, the powertrain model and the energy management control model corresponding to the current test vehicle need to be constructed through preset three-dimensional software, on this basis, corresponding whole vehicle dynamics simulation is performed on the powertrain model and the energy management control model according to preset requirements, so as to correspondingly obtain target working conditions that can be used for the test, where it is noted that the target working conditions provided in this embodiment include the RAL working conditions and the RFM working conditions.
And step S20, constructing a drive axle bench test working condition matched with the test vehicle according to the target working condition, and completing the drive axle endurance test of the test vehicle through the drive axle bench test working condition.
Finally, in this step, it should be noted that, after the required target working condition is obtained through the above step, this step further builds a driving axle bench test working condition suitable for the driving axle bench based on the current target working condition, where it can be understood that the current driving axle bench test working condition is adapted to the vehicle type of the current test vehicle, and based on this, the driving axle endurance test of the current test vehicle can be finally completed through the driving axle bench test working condition.
When the test vehicle is detected, a power assembly model and an energy management control model corresponding to the current test vehicle are constructed, and whole vehicle dynamics simulation is carried out according to the power assembly model and the energy management control model based on preset requirements so as to extract target working conditions corresponding to a drive axle in the test vehicle; and finally, constructing a drive axle bench test working condition matched with the test vehicle according to the target working condition, and completing the drive axle endurance test of the test vehicle through the drive axle bench test working condition. The test working condition of the driving axle bench generated in the mode can be considered to be durable and damaged, the problem that the strength design of a transmission part in a driving axle is insufficient or over-designed can be effectively avoided, meanwhile, the designed test working condition is not consistent with the actual condition of a vehicle, the problem of unconventional failure is caused, and the durability of the driving axle can be comprehensively and effectively verified.
It should be noted that the foregoing implementation procedure is only for illustrating the feasibility of the present application, but this does not represent that the driving axle endurance test method of the present application is only one implementation procedure, and may be included in the feasible implementation of the driving axle endurance test method of the present application, as long as the driving axle endurance test method of the present application can be implemented.
In summary, the method for testing the durability of the driving axle provided by the embodiment of the invention can give consideration to various durable damages, can effectively avoid the problem of insufficient or over-designed strength design of the transmission part in the driving axle, and can also avoid the problem of unconventional failure caused by inconsistent designed test working conditions with the actual conditions of the vehicle, thereby comprehensively and effectively verifying the durability of the driving axle.
The second embodiment of the present invention also provides a driving axle endurance test method, and the driving axle endurance test method provided in this embodiment is different from the driving axle endurance test method provided in the first embodiment described above in that:
specifically, in this embodiment, it should be noted that, the step of performing the whole vehicle dynamics simulation according to the powertrain model and the energy management control model based on the preset requirement to extract the target working condition corresponding to the driving axle in the test vehicle includes:
when the power assembly model and the energy management control model are acquired, carrying out the whole vehicle dynamics simulation on a power system in the test vehicle based on a preset endurance specification through the power assembly model and the energy management control model, wherein the power system comprises the drive axle;
And acquiring a simulation result of the whole vehicle dynamics simulation, and extracting a target working condition corresponding to the driving axle according to the simulation result, wherein the simulation result comprises a torque signal and a rotating speed signal of the driving axle.
Specifically, in this embodiment, it should be noted that, in order to accurately obtain the target working condition adapted to the current test vehicle, after the powertrain model and the energy management control model are obtained, the present embodiment performs the whole vehicle dynamics simulation on the current powertrain model and the energy management control model according to the existing national specified endurance specifications, and specifically, the present embodiment performs the whole vehicle dynamics simulation on the power system in the current test vehicle, where it should be noted that the power system provided in this embodiment includes the driving axle.
Based on the above, the simulation result of the whole vehicle dynamics simulation can be accurately obtained, specifically, the simulation result includes the output torque and the real-time rotation speed of the current driving axle, and further, the embodiment can extract the target working conditions corresponding to the driving axle, namely the RAL working condition and the RFM working condition, according to the current simulation result, so as to facilitate subsequent analysis and processing.
In addition, in this embodiment, it should be noted that the step of extracting the target working condition corresponding to the driving axle according to the simulation result includes:
performing discrete processing on the torque signal and the rotating speed signal to split the torque signal and the rotating speed signal into a plurality of corresponding segmented data signals, wherein the segmented data signals comprise separation frequency and separation time;
and counting the target rotating speed and the target circulation times corresponding to each torque segment signal in the segmented data signals, and forming RAL working conditions in the target working conditions according to the torque segment signals, the target rotating speed and the target circulation times. Specifically, the RAL operating conditions provided in this embodiment are shown in table 1 below:
TABLE 1
In addition, in this embodiment, it should be noted that, after the required torque signal and the rotation speed signal are obtained through the above steps, in order to accurately analyze the real-time working condition of the current drive axle, in this embodiment, discrete processing, that is, corresponding splitting processing, is performed on the torque signal and the rotation speed signal, so as to split the current torque signal and the rotation speed signal into a plurality of corresponding segmented data signals, where the segmented data signals include a separation frequency and a separation time. Preferably, in this embodiment, the current separation frequency may be set to 100Hz, the current separation time may be set to 0.01s, and specifically, corresponding adjustment may be made according to the actual test situation, which is all within the protection scope of this embodiment.
Furthermore, the embodiment also counts the target rotation speed and the target cycle number corresponding to each torque segment signal in the segmented data signals, that is, each torque segment signal includes a corresponding target rotation speed and target cycle number, based on which the RAL working condition in the target working condition can be formed finally according to the torque segment signal, the target rotation speed and the target cycle number acquired in real time.
In addition, in this embodiment, it should be noted that the step of extracting the target working condition corresponding to the driving axle according to the simulation result includes:
extracting a plurality of torque signals in the simulation result;
and counting a plurality of torque fatigue rings in the torque signals according to a rain flow counting method, wherein the torque fatigue rings comprise torque amplitude, torque average value and cycle number information, and generating RFM working conditions in the target working conditions according to the torque amplitude, the torque average value and the cycle number. Specifically, the RFM working conditions provided in this embodiment are shown in table 2 below:
TABLE 2
In addition, in this embodiment, it should be noted that, after the simulation result is obtained, the present embodiment further extracts a torque signal in the current simulation result, and at the same time, performs a separation process on the current torque signal, so as to generate a plurality of corresponding torque segment signals.
Further, the torque amplitude value in the current torque section signals, the torque average value among the torque section signals and the circulation times corresponding to each torque section signal are counted through the existing rain flow counting method, and on the basis, the RFM working condition in the target working condition can be generated in real time according to the current obtained torque amplitude value, torque average value and circulation times.
In addition, in this embodiment, it should be further noted that the step of constructing the driving axle bench test condition adapted to the test vehicle according to the target condition includes:
when the RAL working condition is obtained, detecting a driving gear contained in the driving axle, and calculating bending stress and contact stress between the driving gears according to each torque section signal;
calculating the bending fatigue damage and the contact fatigue damage of the gear in single cycle of each torque section signal according to the bending fatigue SN curve and the contact fatigue SN curve of the driving gear, and calculating the corresponding bending fatigue damage value of the gear, the reverse dragging bending fatigue damage value of the gear, the contact fatigue damage value of the gear and the reverse dragging contact fatigue damage value of the gear according to the cycle times corresponding to each torque section signal;
Setting the gear driving bending fatigue damage value, the gear anti-dragging bending fatigue damage value, the gear driving contact fatigue damage value and the gear anti-dragging contact fatigue damage value as endurance target values of the RAL working conditions, and generating RAL endurance test working conditions suitable for a drive axle rack according to the endurance target values. Specifically, the working conditions of the RAL endurance test provided in this embodiment are shown in table 3 below:
TABLE 3 Table 3
In addition, in this embodiment, it should be further noted that, the failure modes of the gears in the existing drive axle are mainly divided into two types, one type is tooth root broken tooth failure and the other type is tooth surface pitting failure, so that the drive axle bench test working condition provided in this embodiment should also consider the two types of failure modes, where it should be noted that the tooth root broken tooth failure mainly reflects the bending stress and the corresponding number of cycles of the gears, the tooth surface pitting failure mainly reflects the contact stress and the corresponding number of cycles of the tooth surfaces, and the bending fatigue SN curve of the existing gears is different from the contact fatigue SN curve, and based on this, the embodiment constructs the required drive axle bench test working condition by the following manner.
Specifically, in this embodiment, the bending stress of the gear is calculated according to the torque segment signals of the RAL working conditionAnd contact stress->Wherein T represents the transposition of the matrix, and further, the bending fatigue damage of the gear generated by single cycle of each current torque section signal is calculated respectivelyAnd gear contact fatigue damage->Furthermore, the cycle times corresponding to each torque section signal are calculated respectively to calculate the bending fatigue damage value of the gear drive +.>Reverse dragging bending fatigue damage value of gear>Gear drive contact fatigue damage value +.>And gear anti-dragging contact fatigue damage value +.>These damage values can all be the endurance targets for the RAL operating conditions described above.
Further, the present embodiment defines the following matrix equation:
wherein ,for the number of cycles of each torque segment to be solved,the matrix equation is defined by finding a set of solutions X such that the designed gear bending fatigue damage and the designed tooth surface contact fatigue damage in the durable working condition reach the target damage simultaneously, namely +.>Andfurther, the solution target of this embodiment is:
the method comprises the steps of converting a solving problem into a non-negative linear least square problem through the formula, solving the circulation times X of each torque section by adopting the existing matlab function based on the non-negative linear least square problem, and then selecting the maximum rotating speed of each torque section as the input rotating speed of a durability test to correspondingly obtain the RAL durability test working condition.
In this embodiment, it should be noted that, after the step of generating the RAL endurance test condition applicable to the driving axle stand according to the endurance target value, the method further includes:
when the RAL endurance test working condition is obtained, detecting an input shaft spline in the drive axle, and calculating a target damage value of the RFM working condition to the input shaft spline; setting the target damage value as a durability target value of the RFM working condition, and extracting a maximum driving torque and a minimum driving torque from the RAL durability test working condition;
specifically, as shown in fig. 2, the embodiment provides the single durable condition loading sequence chart, sets the maximum driving torque and the minimum driving torque as a single RFM condition, and calculates a single damage value of the single RFM condition on the input shaft spline, so as to obtain the target cycle number of the single RFM condition according to the single damage value.
In this embodiment, it should be further noted that, in this embodiment, after the foregoing RAL endurance test working condition is obtained, the input shaft spline in the current drive axle is detected correspondingly in real time, and at the same time, the target damage value d of the RFM working condition on the current input shaft spline is calculated s Namely as a singleThe durability target of the RFM working condition of the platform drive axle test, further, the required maximum driving torque and minimum driving torque are extracted from the RAL durability test working condition, the current maximum driving torque and the minimum driving torque are set as single RFM working conditions based on the durability target, and the damage d of the current single RFM working condition to the spline of the current input shaft is calculated s1 So that the circulation times of the current single RFM working condition isBased on this, a drive axle stand test condition including the above-described RFM condition durability target can be designed.
In this embodiment, it should be noted that, after the step of obtaining the target cycle number of the single RFM working condition according to the single damage value, the method further includes:
and calculating the target cycle times of the single RFM working condition according to the target damage value and the single damage value, and testing the RAL endurance test working condition according to the target cycle times to construct the drive axle stand test working condition, wherein the drive axle stand test working condition comprises RFM working condition target endurance damage and RAL working condition target endurance damage.
In this embodiment, it should be noted that, in this embodiment, the target cycle number of the single RFM working condition may be calculated in real time by using the target damage value and the single damage value, and on this basis, only the RAL endurance test working condition may be subjected to a corresponding cycle test according to the target cycle number, so as to finally construct a required driving axle stand test working condition.
It should be noted that, for the sake of brevity, the method according to the second embodiment of the present invention, which implements the same principle and some of the technical effects as the first embodiment, is not mentioned here, and reference is made to the corresponding content provided by the first embodiment.
In summary, the method for testing the durability of the driving axle provided by the embodiment of the invention can give consideration to various durable damages, can effectively avoid the problem of insufficient or over-designed strength design of the transmission part in the driving axle, and can also avoid the problem of unconventional failure caused by inconsistent designed test working conditions with the actual conditions of the vehicle, thereby comprehensively and effectively verifying the durability of the driving axle.
Referring to fig. 3, a third embodiment of the present invention provides a driving axle endurance test system, which includes:
the simulation module 12 is configured to construct a powertrain model and an energy management control model corresponding to a current test vehicle when the test vehicle is detected, and perform whole vehicle dynamics simulation according to the powertrain model and the energy management control model based on preset requirements, so as to extract a target working condition corresponding to a drive axle in the test vehicle;
The working condition design module 22 is configured to construct a driving axle bench test working condition adapted to the test vehicle according to the target working condition, and complete a driving axle endurance test of the test vehicle through the driving axle bench test working condition.
In the above-mentioned driving axle endurance test system, the simulation module 12 is specifically configured to:
when the power assembly model and the energy management control model are acquired, carrying out the whole vehicle dynamics simulation on a power system in the test vehicle based on a preset endurance specification through the power assembly model and the energy management control model, wherein the power system comprises the drive axle;
and acquiring a simulation result of the whole vehicle dynamics simulation, and extracting a target working condition corresponding to the driving axle according to the simulation result, wherein the simulation result comprises a torque signal and a rotating speed signal of the driving axle.
In the above-mentioned driving axle endurance test system, the simulation module 12 is further specifically configured to:
performing discrete processing on the torque signal and the rotating speed signal to split the torque signal and the rotating speed signal into a plurality of corresponding segmented data signals, wherein the segmented data signals comprise separation frequency and separation time;
And counting the target rotating speed and the target circulation times corresponding to each torque segment signal in the segmented data signals, and forming RAL working conditions in the target working conditions according to the torque segment signals, the target rotating speed and the target circulation times.
In the above-mentioned driving axle endurance test system, the simulation module 12 is further specifically configured to:
extracting a plurality of torque signals in the simulation result;
and counting a plurality of torque fatigue rings in the torque signals according to a rain flow counting method, wherein the torque fatigue rings comprise torque amplitude, torque average value and cycle number information, and generating RFM working conditions in the target working conditions according to the torque amplitude, the torque average value and the cycle number.
In the above-mentioned driving axle endurance test system, the working condition design module 22 is specifically configured to:
when the RAL working condition is obtained, detecting a driving gear contained in the driving axle, and calculating bending stress and contact stress between the driving gears according to each torque section signal;
calculating the bending fatigue damage and the contact fatigue damage of the gear in single cycle of each torque section signal according to the bending fatigue SN curve and the contact fatigue SN curve of the driving gear, and calculating the corresponding bending fatigue damage value of the gear, the reverse dragging bending fatigue damage value of the gear, the contact fatigue damage value of the gear and the reverse dragging contact fatigue damage value of the gear according to the cycle times corresponding to each torque section signal;
Setting the gear driving bending fatigue damage value, the gear anti-dragging bending fatigue damage value, the gear driving contact fatigue damage value and the gear anti-dragging contact fatigue damage value as endurance target values of the RAL working conditions, and generating RAL endurance test working conditions suitable for a drive axle rack according to the endurance target values.
Among them, in the above-mentioned transaxle endurance test system, the transaxle endurance test system still includes first processing module 32, first processing module 32 is specifically used for:
when the RAL endurance test working condition is obtained, detecting an input shaft spline in the drive axle, and calculating a target damage value of the RFM working condition to the input shaft spline; setting the target damage value as a durability target value of the RFM working condition, and extracting a maximum driving torque and a minimum driving torque from the RAL durability test working condition;
setting the maximum driving torque and the minimum driving torque as single RFM working conditions, and calculating a single damage value of the single RFM working conditions to the input shaft spline so as to obtain target cycle times of the single RFM working conditions according to the single damage value.
In the above-mentioned driving axle endurance test system, the driving axle endurance test system further includes a second processing module 42, where the second processing module 42 is specifically configured to:
and calculating the target cycle times of the single RFM working condition according to the target damage value and the single damage value, and testing the RAL endurance test working condition according to the target cycle times to construct the drive axle stand test working condition, wherein the drive axle stand test working condition comprises RFM working condition target endurance damage and RAL working condition target endurance damage.
A fourth embodiment of the present invention provides a computer including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the drive axle endurance test method provided in the above embodiment when executing the computer program.
A fifth embodiment of the present invention provides a readable storage medium having a computer program stored thereon, wherein the program when executed by a processor implements the drive axle endurance test method provided by the above embodiment.
In summary, the method, the system, the computer and the readable storage medium for testing the durability of the driving axle provided by the embodiment of the invention can give consideration to various durability damages, can effectively avoid the problem of insufficient or over-designed strength design of the transmission part in the driving axle, and can also avoid the problem of unconventional failure caused by inconsistent designed test working conditions and actual conditions of the vehicle, thereby comprehensively and effectively verifying the durability of the driving axle.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. 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 invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. A method of testing durability of a drive axle, the method comprising:
When a test vehicle is detected, a power assembly model and an energy management control model corresponding to the current test vehicle are constructed, and whole vehicle dynamics simulation is carried out according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle;
constructing a drive axle bench test condition matched with the test vehicle according to the target condition, and completing a drive axle endurance test of the test vehicle through the drive axle bench test condition;
the step of carrying out whole vehicle dynamics simulation according to the power assembly model and the energy management control model based on preset requirements to extract a target working condition corresponding to a drive axle in the test vehicle comprises the following steps:
when the power assembly model and the energy management control model are acquired, carrying out the whole vehicle dynamics simulation on a power system in the test vehicle based on a preset endurance specification through the power assembly model and the energy management control model, wherein the power system comprises the drive axle;
obtaining a simulation result of the whole vehicle dynamics simulation, and extracting a target working condition corresponding to the driving axle according to the simulation result, wherein the simulation result comprises a torque signal and a rotating speed signal of the driving axle;
The step of extracting the target working condition corresponding to the driving axle according to the simulation result comprises the following steps:
performing discrete processing on the torque signal and the rotating speed signal to split the torque signal and the rotating speed signal into a plurality of corresponding segmented data signals, wherein the segmented data signals comprise separation frequency and separation time;
counting a target rotating speed and a target cycle number corresponding to each torque segment signal in the segmented data signals, and forming an RAL working condition in the target working conditions according to the torque segment signals, the target rotating speed and the target cycle number;
the step of extracting the target working condition corresponding to the driving axle according to the simulation result comprises the following steps:
extracting a plurality of torque signals in the simulation result;
counting a plurality of torque fatigue rings in the torque signals according to a rain flow counting method, wherein the torque fatigue rings comprise torque amplitude, torque average value and cycle number information, and generating RFM working conditions in the target working conditions according to the torque amplitude, the torque average value and the cycle number;
the step of constructing the driving axle bench test working condition matched with the test vehicle according to the target working condition comprises the following steps:
When the RAL working condition is obtained, detecting a driving gear contained in the driving axle, and calculating bending stress and contact stress between the driving gears according to each torque section signal;
calculating the bending fatigue damage and the contact fatigue damage of the gear in single cycle of each torque section signal according to the bending fatigue SN curve and the contact fatigue SN curve of the driving gear, and calculating the corresponding bending fatigue damage value of the gear, the reverse dragging bending fatigue damage value of the gear, the contact fatigue damage value of the gear and the reverse dragging contact fatigue damage value of the gear according to the cycle times corresponding to each torque section signal;
setting the gear drive bending fatigue damage value, the gear reverse dragging bending fatigue damage value, the gear drive contact fatigue damage value and the gear reverse dragging contact fatigue damage value as endurance target values of the RAL working conditions, and generating RAL endurance test working conditions suitable for a drive axle rack according to the endurance target values;
calculating target damage of a driving gear according to a matrix equation, and calculating the cycle times of each torque section according to a matlab function and the target damage so as to obtain the RAL endurance test working condition;
Wherein the expression of the matrix equation is:
wherein ,for the number of cycles of each torque segment to be solved, d R Representing bending fatigue damage of gear d F Indicating gear contact fatigue damage->，/>Representing the value of the gear drive bending fatigue damage +.>The method is characterized in that the method is used for expressing the gear driving contact fatigue damage value, T is the transposition of a matrix, and the meaning of the matrix equation is that a set of solutions X are found, so that the designed gear bending fatigue damage and tooth surface contact fatigue damage in the durable working condition reach target damage simultaneously.
2. The transaxle endurance test method of claim 1, wherein: after the step of generating the RAL endurance test condition applicable to the drive axle bench according to the endurance target value, the method further includes:
when the RAL endurance test working condition is obtained, detecting an input shaft spline in the drive axle, and calculating a target damage value of the RFM working condition to the input shaft spline; setting the target damage value as a durability target value of the RFM working condition, and extracting a maximum driving torque and a minimum driving torque from the RAL durability test working condition;
setting the maximum driving torque and the minimum driving torque as single RFM working conditions, and calculating a single damage value of the single RFM working conditions to the input shaft spline so as to obtain target cycle times of the single RFM working conditions according to the single damage value.
3. The transaxle endurance test method of claim 2, wherein: after the step of obtaining the target cycle number of the single RFM working condition according to the single damage value, the method further includes:
and calculating the target cycle times of the single RFM working condition according to the target damage value and the single damage value, and testing the RAL endurance test working condition according to the target cycle times to construct the drive axle stand test working condition, wherein the drive axle stand test working condition comprises RFM working condition target endurance damage and RAL working condition target endurance damage.
4. A transaxle endurance test system for implementing the transaxle endurance test method as claimed in any one of claims 1 to 3, the system comprising:
the simulation module is used for constructing a power assembly model and an energy management control model corresponding to the current test vehicle when the test vehicle is detected, and carrying out whole vehicle dynamics simulation according to the power assembly model and the energy management control model based on preset requirements so as to extract a target working condition corresponding to a drive axle in the test vehicle;
The working condition design module is used for constructing a driving axle bench test working condition matched with the test vehicle according to the target working condition and completing a driving axle endurance test of the test vehicle through the driving axle bench test working condition;
in the driving axle endurance test system, the simulation module is specifically configured to:
when the power assembly model and the energy management control model are acquired, carrying out the whole vehicle dynamics simulation on a power system in the test vehicle based on a preset endurance specification through the power assembly model and the energy management control model, wherein the power system comprises the drive axle;
obtaining a simulation result of the whole vehicle dynamics simulation, and extracting a target working condition corresponding to the driving axle according to the simulation result, wherein the simulation result comprises a torque signal and a rotating speed signal of the driving axle;
in the above-mentioned driving axle endurance test system, the simulation module is further specifically configured to:
performing discrete processing on the torque signal and the rotating speed signal to split the torque signal and the rotating speed signal into a plurality of corresponding segmented data signals, wherein the segmented data signals comprise separation frequency and separation time;
And counting the target rotating speed and the target circulation times corresponding to each torque segment signal in the segmented data signals, and forming RAL working conditions in the target working conditions according to the torque segment signals, the target rotating speed and the target circulation times.
5. A computer comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the drive axle endurance test method of any one of claims 1 to 3 when the computer program is executed.
6. A readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the drive axle endurance test method as claimed in any one of claims 1 to 3.
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