CN115577458A - Transmission endurance test method, system, storage medium and equipment - Google Patents
Transmission endurance test method, system, storage medium and equipment Download PDFInfo
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Abstract
The invention provides a transmission endurance test method, a transmission endurance test system, a storage medium and transmission endurance test equipment, and relates to the technical field of automobile tests.
Description
Technical Field
The invention relates to the technical field of vehicle tests, in particular to a transmission durability test method, a transmission durability test system, a transmission durability test storage medium and transmission durability test equipment.
Background
Generally, a domestic transmission manufacturer adopts a national recommended standard endurance standard (QCT 568.1 automobile mechanical transmission assembly bench test method) to verify the endurance capacity of rotating parts such as gears, shafts and bearings in a transmission, and a load spectrum of the relevant standard is only related to the maximum torque of an engine and cannot truly reflect the influence of vehicle parameters (vehicle weight, tire rolling radius and the like) and vehicle endurance conditions on the endurance capacity of the transmission. Therefore, the endurance specification of the national recommended standard often has the problems of insufficient or over-proof test verification, so that the design defects or over-design problems exist in the parts.
Therefore, how to obtain the load spectrum which is real and reliable and reflects the durable working condition of the whole vehicle is particularly critical. In addition, the requirements of a whole vehicle factory on the reliability of the transmission are considered while designing and developing the load spectrum of the transmission, so that the requirements are used for guiding the experimental design and the experimental quotation of the transmission in the early development of a whole vehicle project.
Disclosure of Invention
Based on the above, the invention aims to provide a transmission endurance test method, a transmission endurance test system, a storage medium and transmission endurance test equipment, and aims to solve the problem that in the prior art, the transmission cannot truly reflect the whole vehicle parameters (vehicle weight, tire rolling radius and the like) and the influence of the whole vehicle endurance condition on the transmission endurance capacity in the endurance test process.
A first aspect of the present invention provides a transmission durability test method, the method comprising:
establishing a whole vehicle dynamic model of a target vehicle according to vehicle design parameters of the target vehicle;
according to a preset rule of a finished automobile durability test specification, carrying out road topology modeling based on site information of a target test site to obtain a road topology model;
according to a preset rule of a finished automobile endurance test specification, the finished automobile dynamic model is led into the road topological model for endurance condition simulation, and an endurance condition simulation result is output;
acquiring input shaft information of the transmission according to the endurance condition simulation result, and determining the cycle times of each gear of the transmission in each preset torque section according to the input shaft information to determine an original load spectrum of the transmission;
calculating DV values of gear wheels of all gears of the transmission according to the original load spectrum so as to determine a durability target of the transmission;
iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test according to the reliability requirement of the whole vehicle plant, the test sample size and the limit DV value of each gear of the transmission;
and iteratively calculating a test load spectrum of the transmission for testing according to the durability target value so as to carry out a bench durability test on the transmission according to the test load spectrum.
According to one aspect of the technical scheme, in the step of establishing the whole vehicle dynamic model of the target vehicle according to the vehicle design parameters of the target vehicle, the whole vehicle dynamic model comprises an engine model, a transmission model, a tire model and a whole vehicle model.
According to an aspect of the above technical solution, the step of obtaining the input shaft information of the transmission according to the endurance condition simulation result, and determining the cycle number of each gear of the transmission in each preset torque range according to the input shaft information to determine the original load spectrum of the transmission specifically includes:
acquiring input shaft information of the transmission and gear information of the gearbox according to the finished automobile endurance condition simulation result of the target vehicle; wherein the input shaft information at least comprises the rotating speed and the torque of the input shaft;
determining the cycle times of each gear of the gearbox in each preset torque section according to the input shaft information and the gear information of the gearbox;
determining the number of cycles as a raw load spectrum of the transmission; wherein the original load spectrum is a load spectrum executed when the historical transmission is tested.
According to one aspect of the above technical solution, in the step of iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test according to the reliability requirement of the entire plant, the test sample size, and the limit DV value of each gear of the transmission:
the expression for calculating the contact fatigue damage of the gear is as follows:
the expression for calculating the tooth root bending fatigue damage is:
in the formula, N D ，σ D M is a constant, alpha, related to the material of the test piece 1 And alpha 2 Are constants associated with the gear design.
According to an aspect of the above solution, the DV H And DV F Dimensionless values for characterizing gear contact fatigue damage and root bending fatigue damage are directly proportional to the input torque and rotational speed of the gear.
According to an aspect of the above technical solution, in the formula, k is 1 =3, said k 2 ＝6。
A second aspect of the present invention provides a transmission endurance testing system, the system comprising:
the first modeling module is used for establishing a whole vehicle dynamic model of a target vehicle according to vehicle design parameters of the target vehicle;
the second modeling module is used for carrying out road topology modeling based on site information of a target test site according to a preset rule of a finished automobile endurance test standard so as to obtain a road topology model;
the endurance test module is used for guiding the whole vehicle dynamic model into the road topology model for endurance condition simulation according to a preset rule of a whole vehicle endurance test specification, and outputting an endurance condition simulation result;
the information acquisition module is used for acquiring input shaft information of the transmission according to the endurance condition simulation result, so that the cycle times of each gear of the transmission in each preset torque section are determined according to the input shaft information, and the original load spectrum of the transmission is determined;
the first calculation module is used for calculating DV values of all gear gears of the transmission according to the original load spectrum so as to determine the durability target of the transmission;
the second calculation module is used for iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test according to the reliability requirement of the whole vehicle plant, the test sample size and the limit DV value of each gear of the transmission;
and the third calculation module is used for iteratively calculating a test load spectrum of the transmission for testing according to the durability target value so as to perform a bench durability test on the transmission according to the test load spectrum.
According to an aspect of the foregoing technical solution, the information obtaining module is specifically configured to:
acquiring input shaft information of the transmission and gear information of the gearbox according to the finished automobile endurance condition simulation result of the target vehicle; wherein the input shaft information at least comprises the rotating speed and the torque of the input shaft;
determining the cycle times of each gear of the gearbox in each preset torque section according to the input shaft information and the gear information of the gearbox;
determining the number of cycles as a raw load spectrum of the transmission; wherein the original load spectrum is a load spectrum executed when the historical transmission is tested.
A third aspect of the present invention provides a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the steps of the method of any one of the above-mentioned embodiments.
A fourth aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method according to any one of the above-mentioned technical solutions when executing the program.
Compared with the prior art, the transmission endurance test method, the transmission endurance test system, the transmission endurance test storage medium and the transmission endurance test equipment have the advantages that:
according to the invention, through establishing a whole vehicle dynamics model and a road topology model, in a durable simulation working condition, the variation history of the rotating speed-torque of each gear of the transmission along with time is obtained in a whole vehicle dynamics simulation mode, through adopting a Duty Value (DV) mode, the tooth root tooth breakage durable damage DV value and the tooth surface pitting durable damage DV value of each gear are rapidly calculated and evaluated, the test load spectrum of each gear is obtained through a DV value iteration solving mode according to the sample amount required by a reliability target design test required by a whole vehicle factory and the DV value of a single test transmission, and then the durability test is carried out on the transmission based on the test load spectrum so as to meet the durability issue condition of the test.
Drawings
FIG. 1 is a schematic flow chart of a transmission durability test method according to a first embodiment of the present invention;
FIG. 2 is a diagram illustrating the simulation result of endurance operation completed in step S30 according to the first embodiment of the present invention;
FIG. 3 is a schematic representation of the transmission raw load spectrum extracted in step S40 according to the first embodiment of the present invention;
FIG. 4 is a diagram illustrating DV values of the original load spectrum in step S50 according to the first embodiment of the present invention;
fig. 5 is a schematic diagram of a 1-gear load spectrum adjustment strategy in step S70 according to the first embodiment of the present invention;
FIG. 6 is a load spectrum of the first embodiment of the present invention, in step S70, the 1 st gear is finally applied to the gantry;
FIG. 7 is a block diagram showing the construction of a durability test system of a transmission according to a second embodiment of the present invention;
the following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. 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.
Example one
Referring to fig. 1-6, a schematic flow chart of a transmission endurance testing method according to a first embodiment of the present invention is shown, the method including steps S10-S70:
and S10, establishing a whole vehicle dynamic model of the target vehicle according to the vehicle design parameters of the target vehicle.
Specifically, the design parameters of the target vehicle include design parameters of various parts of the vehicle, such as the length, the width, the height, the density of required materials and the like, and a complete vehicle dynamic model of the target vehicle is established based on the design parameters, wherein the complete vehicle dynamic model comprises an engine model, a gearbox model, a tire model and a complete vehicle model; it should be noted here that the full vehicle model is a frame model excluding an engine model, a transmission model, and a tire model.
And S20, carrying out road topology modeling based on the site information of the target test site according to a preset rule of the whole vehicle endurance test specification to obtain a road topology model.
Specifically, according to the requirements of the finished automobile endurance test standard, road topology modeling is carried out on target test site information, the site information of the target test site comprises information such as test site length, gradient, slope length, turning radius and speed limit, and namely a simulation model for the finished automobile endurance test is generated based on the site information.
And S30, importing the whole vehicle dynamic model into the road topology model for endurance condition simulation according to a preset rule of a whole vehicle endurance test specification, and outputting an endurance condition simulation result.
Specifically, the entire vehicle dynamics model is led into the road topology model, so that dynamic endurance condition simulation can be performed on the entire vehicle dynamics model in the road topology model, and a user can monitor the endurance condition simulation through a display device such as a computer, so that the progress of the endurance condition simulation can be controlled.
The endurance condition simulation result at least comprises simulation time information and simulation vehicle information, and the simulation vehicle information comprises various operation parameters of an engine system and a transmission system, such as rotating speed, temperature and the like.
In this embodiment, the established complete vehicle dynamics model can be stored in a file format or a plug-in mode through storage, and similarly, the established road topology model can be stored in a file format or a plug-in mode. Taking the plug-in form as an example, in a preset simulation system, the whole vehicle dynamic model and the road topology model in the plug-in form are simultaneously introduced, and then the parameters are set, so that the durable working condition simulation of the whole vehicle dynamic model can be carried out in the simulation system through the road topology.
S40, acquiring input shaft information of the transmission according to the endurance condition simulation result, and determining the cycle times of each gear of the transmission in each preset torque section according to the input shaft information to determine an original load spectrum of the transmission;
specifically, the acquired input shaft information of the transmission comprises the rotation speed and the torque information of the input shaft, and the cycle number of each gear of the transmission in each preset torque section in the durable working condition simulation process can be determined through the rotation speed and the torque information of the input shaft of the transmission, so that the original load spectrum of the transmission is determined according to the cycle number of each gear of the transmission in each preset torque section in the durable working condition simulation.
In this embodiment, the step of obtaining the input shaft information of the transmission according to the endurance condition simulation result to determine the number of cycles of each gear of the transmission in each preset torque range according to the input shaft information to determine the original load spectrum of the transmission specifically includes steps S41 to S43:
s41, acquiring input shaft information of the transmission and gear information of the gearbox according to a finished automobile endurance condition simulation result of the target vehicle; wherein the input shaft information at least comprises the rotating speed and the torque of the input shaft;
step S42, determining the cycle times of each gear of the gearbox in each preset torque section according to the input shaft information and the gear information of the gearbox;
step S43, determining the cycle number as a raw load spectrum of the transmission; wherein the original load spectrum is a load spectrum executed when the historical transmission is tested.
The purpose of determining the transmission raw load spectrum among the present embodiments is to: after the original load spectrum is determined, the original load spectrum is optimized, so that the durability test can be carried out on the basis of the optimized load spectrum when the durability test is carried out on the transmission at a later stage; this is, of course, the ultimate goal of the invention.
The embodiment achieves the purpose of carrying out an endurance condition simulation test on the transmission through the optimized load spectrum through steps S50-S70.
Step S50, calculating DV values of gear gears of the transmission according to the original load spectrum so as to determine an endurance target of the transmission;
it should be noted that the DV (Duty value) value is a damage accumulated value, which is a damage accumulated value of each gear in the transmission in the present embodiment, wherein damage of the gear includes damage of a tooth surface and damage of a tooth root, such as gear scratch. The calculation process of tooth root broken tooth damage and tooth surface pitting damage of the gear of the transmission can be simplified, and according to a mini damage accumulation theory, a method for quickly calculating damage of the gear of the transmission, namely a DV value calculation method, is provided, and then tooth root damage DV values and tooth surface damage DV values of all gears are calculated and serve as durability targets of 100% of service life of the transmission.
In the present embodiment, the steps of calculating DV values for each gear of the transmission are as follows:
firstly, according to a linear damage accumulation theory, a calculation method for deducing a DV value is as follows: according to the fatigue strength theory, the equation of the oblique line part of the S-N curve is sigma m N = constant, so there is:
in the formula, σ i Stress level for each condition of the test piece, N i Number of cycles, σ, tested to part failure at each stress D As stress level at test of the test piece, N D In order to test the cycle number of the test piece damage under stress, m is a constant determined by materials and is a negative value of the inverse slope of an S-N curve in a log-log coordinate system.
The damage to the test piece at any number of cycles under any stress can be expressed as follows:
in the formula, n i For any stress sigma i The number of cycles below, d is the corresponding lesion.
The simultaneous equation (1-2) can be obtained:
according to the gear calculation standard (ISO 6336-6-2006), the contact stress and the tooth root bending stress of the gear are expressed as:
in the formula, σ Hi Is the tooth flank contact stress, σ Fi For root bending stress, T i Is input torque of a gear, Z H ，Z E ，Z ε ，Z β ，Z BD ，u，d i ，b，Z Vi ，Z Hβi ，Z Hαi ，m n ，Y F ，Y s ，Y β ，K Vi ，K Fβi And K Fαi Are parameters related to gear design.
When calculating the stress magnitude of the same pair of gears under different input torques, the parameters are constants, and the coefficients related to the gear design are respectively expressed by alpha for the convenience of derivation 1 And alpha 2 Represents:
σ Fi ＝α 2 T i (7)
obtained by substituting the following formulae (6) and (7) for the formula (3), respectively, and causing tooth surface contact fatigue damage d of the gear H And root bending fatigue damage d F Respectively as follows:
in the formula m 1 And m 2 Respectively obtaining the negative values of the inverse slope of the S-N curve of the tooth surface contact fatigue damage and the tooth root bending fatigue damage by finishing:
in the formula, N D ，σ D M is a constant, alpha, related to the material of the test piece 1 And alpha 2 Are constants associated with the gear design. DV H And DV F A dimensionless value can be used to characterize gear contact fatigue damage and root bending fatigue damage in direct proportion to the input torque and speed of the gear. Usually take k 1 ＝3，k 2 The method has the advantages that for the same pair of gears, damage calculation under different working conditions can determine the damage of the gears only by inputting the torque and the cycle times of the gears, the method is used for transversely comparing the contact fatigue damage and the tooth root bending fatigue damage of the gears under different working conditions, and related design parameters of the gears do not need to be input, so that the method greatly simplifies the damage calculation process of the gears, and can be applied to transverse comparison of the gear fatigue damage of the same transmission under different loads and equivalent damage treatment of a load spectrum.
The DV value calculation results of the load spectrum in this example are shown in FIG. 4, which respectively calculate DV of each gear driving and reverse dragging H And DV F 。
And S60, iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test according to the reliability requirement of the whole vehicle plant, the test sample size and the limit DV value of each gear of the transmission.
Specifically, the required test sample amount and the durability target value are calculated according to the reliability requirement of the whole car factory. The following reliability requirements apply: the 90% reliability and 50% confidence are illustrated as examples. When a test duration t of 100% is used, the reliability formula according to the binomial distribution is as follows:
in the formula, R is reliability, P is confidence, and the sample amount required by the test is n =6.6 and 7. Then 7 transmission bench tests need to be defined in the project development, and the test duration is 100%, which greatly increases the development cost of the transmission. Therefore, on the premise of ensuring the reliability requirement of the whole car factory, the test duration is prolonged, and test samples are reduced.
In combination with the weibull statistical distribution, one can obtain:
in the formula, L v For extending the test coefficient, β is the shape parameter of the Weibull statistical distribution of the Transmission durability test, t 1 In order to extend the duration of the test, 1 the number of samples corresponding to the test duration is extended.
When 2 test samples are expected to meet the reliability required by the whole vehicle plant, the requirement of a single test can be prolonged to t according to a formula 1 =150%. To prevent failure problems during testing, it is necessary to assess whether the test extended to 150% exceeds the limits of the gear. The tooth flank contact fatigue damage DV calculated in step 5 is therefore determined H And root bending fatigue damage DV F Multiplied by 1.5 times, and then compared with the maximum DV allowed by each gear of the transmission Hmax And DV Fmax By comparison, if the maximum allowable value is not exceeded, the durability test in which the durability target of the transmission is 150% is confirmed. If the maximum allowable value is exceeded, 1 sample is added and countedCalculating the extended test time required until DV H And DV F Is less than DV Hmax And DV Fmax 。
And S70, iteratively calculating a test load spectrum of the transmission for testing according to the durability target value so as to perform a bench durability test on the transmission according to the test load spectrum.
It should be noted that the original load spectrum of the transmission extracted in step S40 includes a large number of operating conditions requiring low torque, and if the test is performed according to the original load spectrum, the duration of the transmission endurance test will be as long as 3-6 months, which increases the test cost and time.
In this embodiment, the transmission derives a test duration for the transmission of 150%, which corresponds to the DV of a target single test H And DV F Is 150% of the original load spectrum. The working conditions of the speed changer are divided into driving working conditions, reverse-dragging working conditions and DV of the driving working conditions H And DV F 150% of the original load spectrum; the durability damage to the transmission caused by the anti-dragging working condition is small, but the influence of reverse stress on parts caused by the anti-dragging working condition cannot be completely ignored, so that 35 ten thousand of cycle times of the anti-dragging working condition are reserved in the embodiment.
Specifically, the iterative processing process of the load spectrum is described by taking the 1-gear operating condition as an example. FIG. 5a is a 1-gear original load spectrum, with an input torque of 0Nm or more and a total cycle number of 12434170. DV preceded by original load spectrum F To do this, the number of cycles below 200Nm (1 gear limit twist) is subtracted, and then the number of cycles 548611 is calculated for 200Nm to adjust the DV of step S10 F1 ＝V F . Due to calculation of DV F And DV H Are different (influenced by the slope of the S-N curve of flank contact fatigue and root bending fatigue), and the adjusted DV H1 Only 59.8% of the original load spectrum. That is, the load spectrum in the adjustment step S10 is consistent with the original load spectrum for the root bending fatigue damage, but the tooth surface contact fatigue damage is only 59.8%, and 41.2% of the tooth surface contact fatigue damage is lost, which results in insufficient tooth surface verification. Therefore, iterative solutions are required so that they are satisfied simultaneously
As shown in fig. 5c, step S20 is adjusted. The total cycle number of the 1-gear in the step S20 is regulated to be 1590197 which is 12.8 percent before regulation, so that the test time is greatly shortened, and the target damage is completely reserved. Finally, according to the durability target value obtained in step S60, a final load spectrum of the 1 st gear is obtained as shown in fig. 6, where the load spectrum of the 1 st gear includes 1.5 times DV F And DV H And the reverse dragging working condition of 35 ten thousand of cycles, and other gear load spectrums are also designed according to the strategy. Therefore, the finally obtained load spectrum can meet the endurance target with 90% reliability and 50% confidence coefficient only by 2 test samples.
In summary, compared with the prior art, the transmission endurance test method shown in the embodiment has the following beneficial effects:
the method comprises the steps of establishing a whole vehicle dynamics model and a road topology model, obtaining the change history of the rotating speed-torque of each gear of the transmission along with time in a form of whole vehicle dynamics simulation under a durable simulation working condition, rapidly calculating and evaluating the tooth root broken tooth durable damage DV value and the tooth surface pitting durable damage DV value of each gear in a form of Duty Value (DV), designing the sample amount required by a test according to the reliability target required by a whole vehicle factory and the DV value of a single test transmission, obtaining the test load spectrum of each gear in a DV value iteration solving mode, and carrying out a durable test on the transmission based on the test load spectrum so as to meet the durable issuing condition of the test.
Example two
Referring to fig. 7, a block diagram of a transmission endurance testing system according to a third embodiment of the present invention is shown, where the system includes:
the first modeling module 10 is used for establishing a complete vehicle dynamics model of a target vehicle according to vehicle design parameters of the target vehicle.
Specifically, the design parameters of the target vehicle include design parameters of various parts of the vehicle, such as the length, the width, the height, the density of required materials and the like, and a complete vehicle dynamic model of the target vehicle is established based on the design parameters, wherein the complete vehicle dynamic model comprises an engine model, a gearbox model, a tire model and a complete vehicle model; here, the entire vehicle model is a frame model excluding an engine model, a transmission model, and a tire model.
And the second modeling module 20 is used for performing road topology modeling based on the site information of the target test site according to a preset rule of the finished automobile endurance test specification to obtain a road topology model.
Specifically, according to the requirement of the durability test specification of the whole vehicle, road topology modeling is carried out on target test site information, the site information of the target test site comprises information such as test site length, gradient, slope length, turning radius and speed limit, and namely a simulation model for the durability test of the whole vehicle is generated based on the site information.
And the endurance test module 30 is used for guiding the whole vehicle dynamic model into the road topology model for endurance condition simulation according to a preset rule of a whole vehicle endurance test specification, and outputting an endurance condition simulation result.
Specifically, the dynamic endurance condition simulation of the entire vehicle dynamics model can be performed in the road topology model by introducing the entire vehicle dynamics model into the road topology model, and then a user can monitor the endurance condition simulation through a display device such as a computer, so that the progress of the endurance condition simulation can be controlled.
The endurance condition simulation result at least comprises simulation time information and simulation vehicle information, and the simulation vehicle information comprises various operation parameters of an engine system and a transmission system, such as rotating speed, temperature and the like.
In this embodiment, the established complete vehicle dynamics model can be stored in a file format or a plug-in mode through storage, and similarly, the established road topology model can be stored in a file format or a plug-in mode. Taking the plug-in form as an example, in a preset simulation system, the whole vehicle dynamic model and the road topology model in the plug-in form are simultaneously introduced, and then the parameters are set, so that the durable working condition simulation of the whole vehicle dynamic model can be carried out in the simulation system through the road topology.
The information acquisition module 40 is configured to acquire input shaft information of the transmission according to the endurance condition simulation result, so as to determine cycle times of each gear of the transmission in each preset torque range according to the input shaft information, and determine an original load spectrum of the transmission;
specifically, the acquired input shaft information of the transmission comprises the rotation speed and the torque information of the input shaft, and the cycle number of each gear of the transmission in each preset torque section in the durable working condition simulation process can be determined through the rotation speed and the torque information of the input shaft of the transmission, so that the original load spectrum of the transmission is determined according to the cycle number of each gear of the transmission in each preset torque section in the durable working condition simulation.
The purpose of determining the transmission raw load spectrum among the present embodiments is to: after the original load spectrum is determined, the original load spectrum is optimized, so that the durability test can be carried out on the basis of the optimized load spectrum when the durability test is carried out on the transmission in the later period; this is, of course, the ultimate goal of the invention.
A first calculating module 50, configured to calculate DV values of gears of each gear of the transmission according to the original load spectrum to determine an endurance target of the transmission;
and the second calculation module 60 is used for iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test according to the reliability requirement of the whole vehicle plant, the test sample size and the limit DV value of each gear of the transmission.
And a third calculation module 70, configured to iteratively calculate a test load spectrum of the transmission for testing according to the durability target value, so as to perform a bench durability test on the transmission according to the test load spectrum.
In this embodiment, the information obtaining module is specifically configured to:
acquiring input shaft information of the transmission and gear information of the gearbox according to the finished automobile endurance condition simulation result of the target vehicle; wherein the input shaft information at least comprises the rotating speed and the torque of the input shaft;
determining the cycle times of each gear of the gearbox in each preset torque section according to the input shaft information and the gear information of the gearbox;
determining the number of cycles as a raw load spectrum of the transmission; wherein the original load spectrum is a load spectrum executed when the historical transmission is tested.
In summary, compared with the prior art, the transmission endurance test method shown in the embodiment has the following beneficial effects:
the method comprises the steps of obtaining the change history of the rotating speed-torque of each gear of the transmission along with time in a form of vehicle dynamics simulation in a durable simulation working condition by establishing a vehicle dynamics model and a road topology model, rapidly calculating and evaluating the tooth root tooth breakage durable damage DV value and the tooth surface pitting durable damage DV value of each gear in a form of Duty Value (DV), designing the sample amount required by a test according to the reliability target required by a vehicle manufacturer and the DV value of a single test transmission, obtaining the test load spectrum of each gear in a DV value iteration solving mode, and carrying out a durable test on the transmission based on the test load spectrum so as to meet the durable issuing condition of the test.
EXAMPLE III
A third embodiment of the invention provides a computer-readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the steps of the method described in the above-mentioned embodiments.
Example four
A fourth embodiment of the invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method in the above embodiments when executing the program.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A transmission durability test method, the method comprising:
establishing a whole vehicle dynamic model of a target vehicle according to vehicle design parameters of the target vehicle;
according to a preset rule of a finished automobile durability test specification, carrying out road topology modeling based on site information of a target test site to obtain a road topology model;
according to a preset rule of a finished automobile endurance test specification, the finished automobile dynamic model is led into the road topological model for endurance condition simulation, and an endurance condition simulation result is output;
acquiring input shaft information of the transmission according to the endurance working condition simulation result, and determining the cycle times of each gear of the transmission in each preset torque section according to the input shaft information so as to determine an original load spectrum of the transmission;
calculating DV values of gear wheels of all gears of the transmission according to the original load spectrum so as to determine a durability target of the transmission;
according to the reliability requirement of the whole vehicle plant, the test sample size and the limit DV value of each gear of the transmission, iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test;
and iteratively calculating a test load spectrum of the transmission for testing according to the durability target value so as to carry out a bench durability test on the transmission according to the test load spectrum.
2. The transmission endurance testing method of claim 1, in which in the step of establishing a full vehicle dynamics model of the target vehicle according to vehicle design parameters of the target vehicle, the full vehicle dynamics model includes an engine model, a transmission model, a tire model, and a full vehicle model.
3. The transmission endurance test method according to claim 1, wherein the step of obtaining input shaft information of the transmission according to the endurance condition simulation result to determine the number of cycles of each gear of the transmission in each preset torque range according to the input shaft information to determine the original load spectrum of the transmission specifically comprises:
acquiring input shaft information of the transmission and gear information of the gearbox according to the finished automobile endurance condition simulation result of the target vehicle; wherein the input shaft information at least comprises the rotating speed and the torque of the input shaft;
determining the cycle times of each gear of the gearbox in each preset torque section according to the input shaft information and the gear information of the gearbox;
determining the number of cycles as a raw load spectrum of the transmission; wherein the original load spectrum is a load spectrum executed when the historical transmission is tested.
4. The transmission endurance test method according to claim 1, wherein in the step of iteratively calculating an actual test sample amount required for the transmission and an endurance target value of the extension test based on the plant reliability requirement, the test sample amount, and the limit DV value of each gear of the transmission:
the expression for calculating the contact fatigue damage of the gear is as follows:
the expression for calculating the tooth root bending fatigue damage is:
in the formula, N D ，σ D M is a constant, alpha, related to the material of the test piece 1 And alpha 2 Are constants associated with the gear design.
5. The transmission durability test method according to claim 4, characterized in that DV H And DV F Dimensionless values for characterizing gear contact fatigue damage and root bending fatigue damage are directly proportional to the input torque and rotational speed of the gear.
6. The transmission durability test method according to claim 4, characterized in that in the formula, the k is 1 =3, said k 5 ＝6。
7. A transmission endurance testing system, said system comprising:
the first modeling module is used for establishing a whole vehicle dynamic model of a target vehicle according to vehicle design parameters of the target vehicle;
the second modeling module is used for carrying out road topology modeling based on site information of a target test site according to a preset rule of a finished automobile endurance test standard so as to obtain a road topology model;
the endurance test module is used for guiding the whole vehicle dynamic model into the road topology model for endurance condition simulation according to a preset rule of a whole vehicle endurance test specification, and outputting an endurance condition simulation result;
the information acquisition module is used for acquiring input shaft information of the transmission according to the endurance condition simulation result, so that the cycle times of each gear of the transmission in each preset torque section are determined according to the input shaft information, and the original load spectrum of the transmission is determined;
the first calculation module is used for calculating DV values of gear wheels of each gear of the transmission according to the original load spectrum so as to determine an endurance target of the transmission;
the second calculation module is used for iteratively calculating the actual test sample size required by the transmission and the endurance target value of the extension test according to the reliability requirement of the whole vehicle plant, the test sample size and the limit DV value of each gear of the transmission;
and the third calculation module is used for iteratively calculating a test load spectrum of the transmission for testing according to the durability target value so as to perform a bench durability test on the transmission according to the test load spectrum.
8. The gearbox endurance testing system of claim 7, in which the information acquisition module is specifically configured to:
acquiring input shaft information of the transmission and gear information of the gearbox according to the finished automobile endurance condition simulation result of the target vehicle; wherein the input shaft information at least comprises the rotating speed and the torque of the input shaft;
determining the cycle times of each gear of the gearbox in each preset torque section according to the input shaft information and the gear information of the gearbox;
determining the number of cycles as a raw load spectrum of the transmission; wherein the original load spectrum is a load spectrum executed when the historical transmission is tested.
9. A computer-readable storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the method of any one of claims 1 to 6.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-6 when executing the program.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116337484A (en) * | 2023-05-30 | 2023-06-27 | 麦格纳动力总成(江西)有限公司 | Drive axle endurance test method, system, computer and readable storage medium |
| CN116502329A (en) * | 2023-04-11 | 2023-07-28 | 蜂巢传动科技邳州有限公司 | Transmission case strength analysis method, transmission case strength analysis device, electronic device, and storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116502329A (en) * | 2023-04-11 | 2023-07-28 | 蜂巢传动科技邳州有限公司 | Transmission case strength analysis method, transmission case strength analysis device, electronic device, and storage medium |
| CN116502329B (en) * | 2023-04-11 | 2024-01-05 | 蜂巢传动科技邳州有限公司 | Transmission case strength analysis method, transmission case strength analysis device, electronic device, and storage medium |
| CN116337484A (en) * | 2023-05-30 | 2023-06-27 | 麦格纳动力总成(江西)有限公司 | Drive axle endurance test method, system, computer and readable storage medium |
| CN116337484B (en) * | 2023-05-30 | 2023-09-26 | 麦格纳动力总成(江西)有限公司 | Drive axle endurance test method, system, computer and readable storage medium |
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