CN114371018B - Bench endurance test method and system for suspension bracket of automobile power assembly - Google Patents
Bench endurance test method and system for suspension bracket of automobile power assembly Download PDFInfo
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Abstract
The invention discloses a bench endurance test method and a system of an automobile power assembly suspension bracket, wherein the method comprises the following steps: acquiring whole road spectrum data of the automobile in a working state through a force sensor, wherein the whole road spectrum data at least comprises working condition loads of specific working conditions; according to the actual measured value of the working condition load, carrying out rain flow counting statistics and analysis on the actual measured value of the working condition load; carrying out iterative computation on the whole vehicle road spectrum data according to the correction coefficient to obtain a corrected loading load range and corresponding loading cycle times; and selecting any loading load in the loading load range and the loading cycle times corresponding to the loading load, performing bench test on the suspension bracket according to the loading load and the loading cycle times, and outputting test results. The invention can solve the technical problems that the design of the suspension bracket is excessive or no effective means is enhanced due to the fact that the traditional general 28 working conditions are adopted to calculate the stress of the suspension bracket and the result of the durable road test of the whole vehicle is not corresponding in the prior art.
Description
Technical Field
The invention relates to the technical field of automobile suspension testing, in particular to a bench endurance test method and system of an automobile power assembly suspension bracket.
Background
The power assembly suspension bracket is mainly used for supporting important power components including an engine and a gearbox, and has the main functions of supporting the reaction force generated by the motion acceleration of the power assembly under various working conditions, when the durability condition of the bench is defined, the main direction stress size under the specific working condition is usually calculated according to the general 28 working condition theory, and the main direction maximum stress is loaded on the bench equipment by multiplying the coefficient and the fixed cycle number.
However, for commercial light truck platforms, the traditional general 28 working conditions are adopted to calculate the stress of the suspension bracket, and the suspension bracket is used as the load input of a bench endurance test, and is not corresponding to the endurance test result of the whole vehicle, and excessive design or no effective means are adopted for reinforcement, so that the bracket structure is complex, the weight cost is increased, and the like.
Disclosure of Invention
Based on the above, the invention aims to provide a bench endurance test method and a bench endurance test system for a suspension bracket of an automobile power assembly, and aims to solve the technical problems that the design of the suspension bracket is excessive or no effective means is enhanced due to the fact that the stress of the suspension bracket is calculated by adopting the traditional general 28 working conditions and is not corresponding to the endurance road test result of the whole automobile in the prior art.
The first aspect of the present invention provides a bench endurance test method for a powertrain suspension bracket of an automobile, the bench endurance test method including:
acquiring whole road spectrum data of an automobile in a working state through a force sensor, wherein the whole road spectrum data at least comprises working condition loads of a suspension bracket under specific working conditions;
according to the actual measurement value of the working condition load, carrying out rain flow counting statistics and analysis on the actual measurement value of the working condition load;
setting a correction coefficient of a bench test based on a preset rule, and performing iterative calculation on the whole vehicle road spectrum data according to the correction coefficient to obtain a corrected loading load range and corresponding loading cycle times;
and assembling the suspension bracket to rack durable equipment through a tool, keeping the whole vehicle assembling posture, selecting any loading load in the loading load range and the loading cycle number corresponding to the loading load, carrying out rack test on the suspension bracket according to the loading load and the loading cycle number, and outputting test results.
According to one aspect of the above technical solution, the step of obtaining the whole vehicle road spectrum data when the vehicle is in the working state through the force sensor specifically includes:
manufacturing a test tool by adopting a three-component force sensor and assembling the test tool on a suspension bracket of an automobile;
and when the automobile is in a working state, acquiring the whole automobile road spectrum data of the automobile in a road test environment.
According to an aspect of the above technical solution, the whole vehicle road spectrum data at least includes working condition loads under each specific working condition of the suspension bracket.
According to an aspect of the foregoing technical solution, after the step of counting and analyzing the rain flow for the actual measurement value of the working condition load according to the actual measurement value of the working condition load, the method further includes:
according to the result of the statistics and analysis of the rain flow count, the cycle times, the load range and the load average value of the suspension bracket under each specific working condition are obtained;
and establishing a first relation matrix of the cycle times, the load range and the load mean value of the suspension bracket.
According to an aspect of the foregoing technical solution, after the step of establishing the relationship matrix of the cycle number, the normal load range, and the normal load mean value of the suspension bracket, the method further includes:
substituting the damage curve, and calculating to obtain a damage value of the suspension bracket, a difference value between the maximum load and the minimum load and a mean value of the maximum load and the minimum load;
and establishing a second relation matrix of the damage value, the difference value between the maximum load and the minimum load and the average value of the maximum load and the minimum load of the suspension bracket.
According to one aspect of the above technical solution, setting a correction coefficient of a bench test based on a preset rule, and performing iterative computation on the whole vehicle spectrum data according to the correction coefficient to obtain a corrected loading load range and a corresponding loading cycle number, where the method specifically includes:
dividing the relation matrix into a plurality of parts according to the damage, setting the maximum damage value of each part, inquiring the force corresponding to the maximum damage value, and calculating to obtain the maximum force and the minimum force so as to obtain the loading force range of the bench test;
dividing the obtained damage sum by the corresponding maximum damage to obtain a damage coefficient, multiplying the cycle number corresponding to the maximum damage by the damage coefficient, and obtaining the cycle total number of the bench endurance test according to the safety coefficient of the bench.
Another aspect of the present invention is to provide a rack endurance test system of an automotive powertrain suspension bracket, the system comprising:
the system comprises a data acquisition module, a control module and a control module, wherein the data acquisition module is used for acquiring whole road spectrum data of an automobile when the automobile is in a working state through a force sensor, and the whole road spectrum data at least comprises working condition loads of a suspension bracket under specific working conditions;
the data analysis module is used for carrying out rain flow counting statistics and analysis on the actual measured value of the working condition load according to the actual measured value of the working condition load;
the iterative computation module is used for setting a correction coefficient of the bench test based on a preset rule, and carrying out iterative computation on the whole vehicle road spectrum data according to the correction coefficient so as to obtain a corrected loading load range and corresponding loading cycle times;
the rack test module is used for assembling the suspension bracket to rack durable equipment through a tool, keeping the whole vehicle assembly posture, selecting any loading load in the loading load range and the loading cycle number corresponding to the loading load, carrying out rack test on the suspension bracket according to the loading load and the loading cycle number, and outputting test results.
According to an aspect of the foregoing technical solution, the data acquisition module is specifically configured to:
manufacturing a test tool by adopting a three-component force sensor and mounting the test tool on a suspension bracket of an automobile;
and when the automobile is in a working state, acquiring the whole automobile road spectrum data of the automobile in a road test environment.
According to an aspect of the foregoing technical solution, the iterative computation module is specifically configured to:
dividing the relation matrix into a plurality of parts according to the damage, setting the maximum damage value of each part, inquiring the force corresponding to the maximum damage value, and calculating to obtain the maximum force and the minimum force so as to obtain the loading force range of the bench test;
dividing the obtained damage sum by the corresponding maximum damage to obtain a damage coefficient, multiplying the cycle number corresponding to the maximum damage by the damage coefficient, and obtaining the cycle total number of the bench endurance test according to the safety coefficient of the bench.
Compared with the prior art, the bench endurance test method and system for the automobile power assembly suspension bracket have the beneficial effects that: the endurance test condition of the suspension bracket rack is obtained by combining the comprehensive vehicle type engineering experience and considering the actual vehicle road test working condition and combining the whole vehicle road spectrum data processing technology, and compared with the test condition calculated by adopting the single general 28 working condition theory in the past, the accuracy is higher, the matching degree with the whole vehicle road test is high, and the damage is similar. The method has important effects on the early strength assessment and the late fault pertinence improvement optimization of the product development, reduces weight and cost on the premise of guaranteeing the durability of the strength, shortens the durability test period, shortens the vehicle type development period and can effectively achieve the light-weight target.
Drawings
Fig. 1 is a schematic flow chart of a method for testing the durability of a rack of a suspension bracket according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a bench endurance test system for an automotive suspension bracket in a third embodiment of the invention;
the following detailed description will further illustrate the invention with reference to the above-described drawings.
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.
Example 1
Referring to fig. 1, a first embodiment of the present invention provides a method for testing durability of a rack of a power assembly suspension bracket of an automobile, wherein the method includes steps S10-S40 of:
s10, acquiring whole road spectrum data of an automobile in a working state through a force sensor, wherein the whole road spectrum data at least comprises working condition loads of a suspension bracket under all working conditions;
the force sensor is used for acquiring the whole vehicle road spectrum data when the vehicle is in a working state, and at least comprises working condition loads of the suspension bracket under specific working conditions, namely, stress data of the suspension bracket under the specific working conditions are acquired, and data support is provided for later improvement of the suspension bracket by acquiring the working condition loads of the suspension bracket under the specific working conditions.
Step S20, according to the actual measurement value of the working condition load, carrying out rain flow counting statistics and analysis on the actual measurement value of the working condition load;
the main function of the rain flow counting is to simplify the actual measurement load process into a plurality of load cycles for fatigue life estimation and fatigue test load spectrum programming. Based on the double-parameter method, two variables of dynamic strength (amplitude) and static strength (mean) are considered, and the characteristics inherent to fatigue load are met.
Specifically, after the actual measurement value of the working condition load of the suspension bracket is counted, counted and analyzed, a reasonable range of the bench test load can be preset, so that the bench test is performed on the suspension bracket according to the range set by the test load.
Step S30, setting a correction coefficient of a bench test based on a preset rule, and carrying out iterative computation on the whole vehicle road spectrum data according to the correction coefficient to obtain a corrected loading load range and corresponding loading cycle times;
it should be noted that, the determination of the correction coefficient is determined based on many complex and unquantifiable parameters, such as engineering experience, etc.
After the correction coefficient of the bench test of the suspension bracket is determined, iterative calculation is carried out on the whole vehicle road spectrum data based on the set correction coefficient, so that a corrected loading load range and corresponding loading cycle times are obtained.
The loading load range in which the loading load for the bench test of the suspension bracket is set may be, for example, a plurality of load sections, each of which corresponds to a different number of loading cycles, for example.
And S40, assembling the suspension bracket to rack durable equipment through a tool, keeping the whole vehicle assembly posture, selecting any loading load in the loading load range and the loading cycle number corresponding to the loading load, carrying out rack test on the suspension bracket according to the loading load and the loading cycle number, and outputting test results.
After the suspension bracket is assembled to the rack durable equipment through the tool, the whole vehicle assembling posture is kept, namely the posture of the suspension bracket in the rack durable test is kept consistent with the posture of the whole vehicle during assembling.
After the suspension bracket is assembled to the rack endurance equipment, according to the corrected loading load range and the corresponding loading cycle times, selecting any loading load in the loading load range and the loading cycle times corresponding to the loading load, carrying out a rack endurance test on the suspension bracket according to the selected loading load and the corresponding loading cycle times, and outputting a test result after the test is finished, thereby providing data support for later improvement according to the test result of the suspension bracket in the rack test.
Compared with the prior art, the endurance test method for the automobile power assembly suspension bracket shown in the embodiment has the beneficial effects that: the endurance test condition of the suspension bracket rack is obtained by combining the comprehensive vehicle type engineering experience and considering the actual vehicle road test working condition and combining the whole vehicle road spectrum data processing technology, and compared with the test condition calculated by adopting the single general 28 working condition theory in the past, the accuracy is higher, the matching degree with the whole vehicle road test is high, and the damage is similar. The method has important effects on the early strength assessment and the late fault pertinence improvement optimization of the product development, reduces weight and cost on the premise of guaranteeing the durability of the strength, shortens the durability test period, shortens the vehicle type development period and can effectively achieve the light-weight target.
Example two
The second embodiment of the present invention provides a method for testing the durability of a rack of a suspension bracket of an automobile powertrain, wherein the method is as follows:
in this embodiment, the step of acquiring the whole vehicle road spectrum data when the vehicle is in the working state through the force sensor specifically includes steps S11-S12:
s11, manufacturing a test tool by adopting a three-component sensor and assembling the test tool on a suspension bracket of an automobile;
the elastic sensitive element of the three-component force sensor is a round metal flat diaphragm with fixed periphery. When the diaphragm is deformed under pressure, both radial and tangential strains at the center reach positive maxima, while radial strains at the edges reach negative maxima, with zero tangential strain.
And step S12, when the automobile is in a working state, acquiring the whole automobile road spectrum data of the automobile in a road test environment.
And when the automobile is in a working state, such as an engine state and a driving state, at least acquiring working condition loads of the suspension bracket under various working conditions when the automobile is in a road test environment.
In this embodiment, after the step of counting and analyzing the rain flow for the actual measurement value of the working condition load according to the actual measurement value of the working condition load, the method further includes:
according to the result of the statistics and analysis of the rain flow count, the cycle times, the load range and the load average value of the suspension bracket under various working conditions are obtained;
and establishing a first relation matrix of the cycle times, the load range and the load mean value of the suspension bracket.
In this embodiment, after the step of establishing the relationship matrix of the cycle number, the normal load range and the normal load mean value of the suspension bracket, the method further includes:
substituting the damage curve, and calculating to obtain a damage value of the suspension bracket, a difference value between the maximum load and the minimum load and a mean value of the maximum load and the minimum load;
and establishing a second relation matrix of the damage value, the difference value between the maximum load and the minimum load and the average value of the maximum load and the minimum load of the suspension bracket.
In this embodiment, a correction coefficient of a bench test is set based on a preset rule, and iterative calculation is performed on the whole vehicle road spectrum data according to the correction coefficient, so as to obtain a corrected loading load range and a corresponding loading cycle number, which specifically includes:
dividing the relation matrix into a plurality of parts according to the damage, setting the maximum damage value of each part, inquiring the force corresponding to the maximum damage value, and calculating to obtain the maximum force and the minimum force so as to obtain the loading force range of the bench test;
dividing the obtained damage sum by the corresponding maximum damage to obtain a damage coefficient, multiplying the cycle number corresponding to the maximum damage by the damage coefficient, and obtaining the cycle total number of the bench endurance test according to the safety coefficient of the bench.
As an example of the bench endurance test method of the suspension bracket shown in the present invention, the test results of a certain vehicle model are compared as follows:
the bench Fz loading load provided according to the 28 operating mode force and experience is: 7800-11500) N,20 ten thousand times of loading. The load amplitude is larger than the actually measured suspension amplitude (actually measured left suspension: 1087 to (-8363) N and right suspension: 1498 to (-7896) N, and obviously the load setting of the bench is not matched with the actual durability of the whole vehicle, so that the suspension bracket is over-designed.
Wherein, table 1 is the actual measurement load spectrum of the vehicle model on the poor road of road condition, extrapolates to the whole 45000km endurance test, and considers the safety factor of 3.5 times of the bench test, the formulated bench load spectrum. Wherein the first scheme is routine choice of endurance test, and the second scheme is optional if proper acceleration is needed.
TABLE 1
The endurance test condition of the suspension sheet metal bracket rack is obtained by combining the comprehensive vehicle type engineering experience and considering the actual vehicle road test working condition and combining the whole vehicle road spectrum data processing technology, and compared with the test condition calculated by adopting a single general 28 working condition theory in the past, the accuracy is higher, the matching degree with the whole vehicle road test is high, and the damage is similar. The method has important effect on the early strength assessment and the late fault pertinence improvement optimization of the product development. The weight and the cost are reduced on the premise of ensuring the durability of the strength, the durability test period is shortened, the development period is shortened, and the light weight is achieved.
Example III
Referring to fig. 2, a third embodiment of the present invention provides a rack endurance test system for an automotive powertrain suspension bracket, the system comprising:
the data acquisition module 10 is used for acquiring whole vehicle road spectrum data when the vehicle is in a working state through the force sensor, wherein the whole vehicle road spectrum data at least comprises working condition loads of the suspension bracket under specific working conditions;
the force sensor is used for acquiring the whole vehicle road spectrum data when the vehicle is in a working state, and at least comprises working condition loads of the suspension bracket under specific working conditions, namely, stress data of the suspension bracket under the specific working conditions are acquired, and data support is provided for later improvement of the suspension bracket by acquiring the working condition loads of the suspension bracket under the specific working conditions.
The data analysis module 20 is used for carrying out rain flow counting statistics and analysis on the actual measured value of the working condition load according to the actual measured value of the working condition load;
the main function of the rain flow counting is to simplify the actual measurement load process into a plurality of load cycles for fatigue life estimation and fatigue test load spectrum programming. Based on the double-parameter method, two variables of dynamic strength (amplitude) and static strength (mean) are considered, and the characteristics inherent to fatigue load are met.
Specifically, after the actual measurement value of the working condition load of the suspension bracket is counted, counted and analyzed, a reasonable range of the bench test load can be preset, so that the bench test is performed on the suspension bracket according to the range set by the test load.
The iterative computation module 30 is configured to set a correction coefficient of the bench test based on a preset rule, and perform iterative computation on the whole vehicle road spectrum data according to the correction coefficient to obtain a corrected loading load range and a corresponding loading cycle number;
it should be noted that, the determination of the correction coefficient is determined based on many complex and unquantifiable parameters, such as engineering experience, etc.
After the correction coefficient of the bench test of the suspension bracket is determined, iterative calculation is carried out on the whole vehicle road spectrum data based on the set correction coefficient, so that a corrected loading load range and corresponding loading cycle times are obtained.
The loading load range in which the loading load for the bench test of the suspension bracket is set may be, for example, a plurality of load sections, each of which corresponds to a different number of loading cycles, for example.
The bench test module 40 is configured to assemble the suspension bracket to a bench durable device through a tooling, maintain a complete vehicle assembly posture, select any loading load in the loading load range and a loading cycle number corresponding to the loading load, perform a bench test on the suspension bracket according to the loading load and the loading cycle number, and output a test result.
After the suspension bracket is assembled to the rack durable equipment through the tool, the whole vehicle assembling posture is kept, namely the posture of the suspension bracket in the rack durable test is kept consistent with the posture of the whole vehicle during assembling.
After the suspension bracket is assembled to the rack endurance equipment, according to the corrected loading load range and the corresponding loading cycle times, selecting any loading load in the loading load range and the loading cycle times corresponding to the loading load, carrying out a rack endurance test on the suspension bracket according to the selected loading load and the corresponding loading cycle times, and outputting a test result after the test is finished, thereby providing data support for later improvement according to the test result of the suspension bracket in the rack test.
In this embodiment, the data acquisition module 10 is specifically configured to:
manufacturing a test tool by adopting a three-component force sensor and mounting the test tool on a suspension bracket of an automobile;
and when the automobile is in a working state, acquiring the whole automobile road spectrum data of the automobile in a road test environment.
In this embodiment, the iterative calculation module 30 is specifically configured to:
dividing the relation matrix into a plurality of parts according to the damage, setting the maximum damage value of each part, inquiring the force corresponding to the maximum damage value, and calculating to obtain the maximum force and the minimum force so as to obtain the loading force range of the bench test;
dividing the obtained damage sum by the corresponding maximum damage to obtain a damage coefficient, multiplying the cycle number corresponding to the maximum damage by the damage coefficient, and obtaining the cycle total number of the bench endurance test according to the safety coefficient of the bench.
Compared with the prior art, the durability test system adopting the automobile power assembly suspension bracket shown in the embodiment has the beneficial effects that: the endurance test condition of the suspension bracket rack is obtained by combining the comprehensive vehicle type engineering experience and considering the actual vehicle road test working condition and combining the whole vehicle road spectrum data processing technology, and compared with the test condition calculated by adopting the single general 28 working condition theory in the past, the accuracy is higher, the matching degree with the whole vehicle road test is high, and the damage is similar. The method has important effects on the early strength assessment and the late fault pertinence improvement optimization of the product development, reduces weight and cost on the premise of guaranteeing the durability of the strength, shortens the durability test period, shortens the vehicle type development period and can effectively achieve the light-weight target.
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 (5)
1. A bench endurance test method of an automobile power assembly suspension bracket is characterized by comprising the following steps of:
acquiring whole road spectrum data of an automobile in a working state through a force sensor, wherein the whole road spectrum data at least comprises working condition loads of a suspension bracket under specific working conditions;
according to the actual measurement value of the working condition load, carrying out rain flow counting statistics and analysis on the actual measurement value of the working condition load;
setting a correction coefficient of a bench test based on a preset rule, and performing iterative calculation on the whole vehicle road spectrum data according to the correction coefficient to obtain a corrected loading load range and corresponding loading cycle times;
assembling the suspension bracket to rack durable equipment through a tool, keeping the whole vehicle assembling posture, selecting any loading load in the loading load range and the loading cycle number corresponding to the loading load, carrying out rack test on the suspension bracket according to the loading load and the loading cycle number, and outputting test results;
the method comprises the steps of obtaining the whole vehicle road spectrum data when the vehicle is in a working state through the force sensor, and specifically comprises the following steps:
manufacturing a test tool by adopting a three-component force sensor and assembling the test tool on a suspension bracket of an automobile;
when the automobile is in a working state, acquiring whole automobile road spectrum data of the automobile in a road test environment;
the whole vehicle road spectrum data at least comprises working condition loads of the suspension bracket under specific working conditions;
after the step of counting and analyzing the rain flow of the actual measured value of the working condition load according to the actual measured value of the working condition load, the method further comprises the following steps:
according to the result of the statistics and analysis of the rain flow count, the cycle times, the load range and the load average value of the suspension bracket under each specific working condition are obtained;
establishing a first relation matrix of the cycle times, the load range and the load mean value of the suspension bracket;
after the step of establishing the relationship matrix of the cycle number, the normal load range and the normal load mean value of the suspension bracket, the method further comprises the following steps:
substituting the damage curve, and calculating to obtain a damage value of the suspension bracket, a difference value between the maximum load and the minimum load and a mean value of the maximum load and the minimum load;
and establishing a second relation matrix of the damage value, the difference value between the maximum load and the minimum load and the average value of the maximum load and the minimum load of the suspension bracket.
2. The method for testing the durability of the stand of the suspension bracket of the automobile power assembly according to claim 1, wherein the step of setting a correction coefficient of the stand test based on a preset rule, and performing iterative calculation on the whole road spectrum data according to the correction coefficient to obtain a corrected loading load range and a corresponding loading cycle number specifically comprises the steps of:
dividing the relation matrix into a plurality of parts according to the damage, setting the maximum damage value of each part, inquiring the force corresponding to the maximum damage value, and calculating to obtain the maximum force and the minimum force so as to obtain the loading force range of the bench test;
dividing the obtained damage sum by the corresponding maximum damage to obtain a damage coefficient, multiplying the cycle number corresponding to the maximum damage by the damage coefficient, and obtaining the cycle total number of the bench endurance test according to the safety coefficient of the bench.
3. A bench endurance test system for an automotive powertrain suspension bracket, for implementing the bench endurance test method according to any one of claims 1 to 2, the system comprising:
the system comprises a data acquisition module, a control module and a control module, wherein the data acquisition module is used for acquiring whole vehicle road spectrum data when an automobile is in a working state through a force sensor, and the whole vehicle road spectrum data at least comprises working condition loads of a suspension bracket under working conditions;
the data analysis module is used for carrying out rain flow counting statistics and analysis on the actual measured value of the working condition load according to the actual measured value of the working condition load;
the iterative computation module is used for setting a correction coefficient of the bench test based on a preset rule, and carrying out iterative computation on the whole vehicle road spectrum data according to the correction coefficient so as to obtain a corrected loading load range and corresponding loading cycle times;
the rack test module is used for assembling the suspension bracket to rack durable equipment through a tool, keeping the whole vehicle assembly posture, selecting any loading load in the loading load range and the loading cycle number corresponding to the loading load, carrying out rack test on the suspension bracket according to the loading load and the loading cycle number, and outputting test results.
4. The bench endurance test system of an automotive powertrain suspension bracket of claim 3, wherein the data acquisition module is specifically configured to:
manufacturing a test tool by adopting a three-component force sensor and mounting the test tool on a suspension bracket of an automobile;
and when the automobile is in a working state, acquiring the whole automobile road spectrum data of the automobile in a road test environment.
5. The bench endurance test system of an automotive powertrain suspension bracket of claim 3, wherein the iterative computation module is specifically configured to:
dividing the relation matrix into a plurality of parts according to the damage, setting the maximum damage value of each part, inquiring the force corresponding to the maximum damage value, and calculating to obtain the maximum force and the minimum force so as to obtain the loading force range of the bench test;
dividing the obtained damage sum by the corresponding maximum damage to obtain a damage coefficient, multiplying the cycle number corresponding to the maximum damage by the damage coefficient, and obtaining the cycle total number of the bench endurance test according to the safety coefficient of the bench.
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