CN116558855A - Method and device for compiling endurance test load of automobile suspension system bench - Google Patents
Method and device for compiling endurance test load of automobile suspension system bench Download PDFInfo
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Abstract
The application relates to a method and a device for compiling a durability test load of an automobile suspension system bench, which relate to the technical field of suspension systems and comprise the following steps: intercepting and obtaining a characteristic road surface load spectrum at the wheel center of a suspension system; obtaining the same-phase load spectrum at the center of a wheel of a suspension system; obtaining a first fatigue damage ratio between a same-phase load spectrum at the center of a wheel of the suspension system and a corresponding initial equivalent load, and performing first-stage optimization to ensure that the first fatigue damage ratio is within a first-stage optimization preset range; and performing second-stage optimization based on the total fatigue damage of the rack durable and the total fatigue damage of the road test corresponding to the dangerous area of the suspension system, so that the second fatigue damage ratio is within a second-stage optimization preset range. The method establishes the damage consistency correlation between the working condition of the whole vehicle test field and the working condition of the bench endurance test, improves the reliability of equivalent load programming, and overcomes the defects of the bench endurance test of the existing suspension system.
Description
Technical Field
The application relates to the technical field of suspension systems, in particular to a method and a device for compiling a load of a durability test of a bench of an automobile suspension system.
Background
The suspension system is an important component of the automobile, and has the functions of transmitting road surface excitation and load to the automobile body, and buffering and damping impact and vibration caused by road surface unevenness so as to ensure stable running of the automobile. In order to ensure the reliable durability, each host factory can carry out virtual durability simulation analysis and test verification on the test platform in the design stage, and the test verification is generally divided into a whole vehicle road durability test of a test field and an indoor bench durability test, wherein the test field road durability test has long period, high cost, multiple influence factors of the test process and large dispersion of test results, and the indoor bench durability test has short period, low cost, controllable test process and good consistency of test results, so the accurate and sufficient test platform durability test verification of the suspension system is an important means for shortening the development period of the whole vehicle and reducing the development cost.
At present, the loading method of the endurance test of the suspension system rack mainly comprises single-axis loading and multi-axis loading, and the respective defects exist respectively, so that the actual requirements of load programming of the endurance test of the suspension system rack of the current automobile cannot be met. Therefore, in order to meet the technical requirement, a novel load programming technology for the endurance test of the automobile suspension system bench is provided.
Disclosure of Invention
The utility model provides a method and device for compiling load of a bench endurance test of an automobile suspension system, which establishes the damage consistency correlation between the working condition of a whole automobile test field and the working condition of the bench endurance test, improves the reliability of compiling equivalent load and overcomes the defects of the bench endurance test of the existing suspension system.
To achieve the above object, the present application provides the following aspects.
In a first aspect, the present application provides a method for compiling a load for a endurance test of a truck suspension system, the method comprising the steps of:
intercepting and obtaining characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
based on the phase difference of the characteristic road surface load spectrum at the wheel center of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, obtaining the corresponding same-phase load spectrum at the wheel center of the suspension system;
based on the same-phase load spectrum at the center of the suspension system wheel and the corresponding initial equivalent load, a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks is obtained, and the initial equivalent load is optimized for the first stage, so that the first fatigue damage ratio is in a first-stage optimization preset range;
Carrying out linear superposition on the analysis result of the rack endurance under the action of the initial equivalent load of each load component after the first-stage optimization to obtain the total damage of the rack endurance fatigue corresponding to the dangerous area of the suspension system;
and performing second-stage optimization on the initial equivalent load based on the total endurance fatigue damage of the rack corresponding to the dangerous area of the suspension system and the total endurance fatigue damage of the road test obtained according to the load spectrum of the test field at the wheel center of the suspension system, so that the ratio of the total endurance fatigue damage of the rack to the total endurance fatigue damage of the road test is within a second-stage optimization preset range.
Further, the method for obtaining the same phase load spectrum at the wheel center of the corresponding suspension system based on the phase difference of the load spectrum at the wheel center of the corresponding suspension system at the left wheel center and the right wheel center of different characteristic roads by linearly overlapping and recombining the same load component with the same phase difference comprises the following steps:
aiming at characteristic road surface load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, carrying out phase division to obtain three phase differences corresponding to preset load components;
Based on the corresponding phase differences of the three preset load components, integrating to obtain a corresponding load phase table;
adding the cycle number of different characteristic pavements to the load phase table; wherein, the liquid crystal display device comprises a liquid crystal display device,
the three preset load components are FX, FY and FZ respectively;
the phase difference comprises 0 DEG, 180 DEG and delta DEG, wherein the phase difference of 0 DEG indicates the same-phase movement of the left wheel and the right wheel, the phase difference of 180 DEG indicates the reverse movement of the left wheel and the right wheel, the phase difference of delta indicates the movement of a single wheel, and the other wheel only bears the vertical half-load shaft load.
Further, based on the phase difference of the characteristic road surface load spectrum at the wheel center of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, the same load component with the same phase difference is subjected to linear superposition recombination, and the corresponding same phase load spectrum at the wheel center of the suspension system is obtained, wherein the method comprises the following steps:
based on the pseudo damage of load spectrums of three preset load components corresponding to left and right wheel centers of different characteristic road surfaces, selecting the load spectrum of the wheel center with the largest pseudo damage as the same-phase wheel center load corresponding to the preset load component of the wheel center of the suspension system;
aiming at the same-phase wheel center load, the same-phase load spectrum at the wheel center of the suspension system corresponding to each load component combination is obtained according to the linear superposition of the circle number specified in the road spectrum acquisition specification of the test field.
Further, based on the same phase load spectrum at the wheel center of the suspension system and an initial equivalent load obtained by performing pseudo damage equivalent according to the same phase load spectrum at the wheel center of the suspension system, the method respectively obtains the first rack durable fatigue damage corresponding to the dangerous area of the suspension system, the second rack durable fatigue damage and the corresponding first fatigue damage ratio, and comprises the following steps:
performing road test durability simulation analysis on the suspension system to determine a dangerous area of the suspension system;
carrying out rain flow statistics on the same-phase load spectrum at the wheel center of the suspension system to obtain a corresponding load amplitude-average value-frequency matrix;
calculating to obtain pseudo damage corresponding to each matrix unit in the load amplitude-average value-frequency matrix;
summing the pseudo injuries corresponding to each matrix unit in the load amplitude-average value-frequency matrix to obtain pseudo injuries corresponding to the same-phase load spectrum at the wheel center of the suspension system;
calculating and obtaining the cycle number corresponding to the initial equivalent load based on the maximum load amplitude in the load amplitude-average value-frequency matrix;
obtaining initial equivalent load corresponding to the same-phase load spectrum at the wheel center of the suspension system based on the pseudo damage corresponding to the same-phase load spectrum at the wheel center of the suspension system and the cycle number corresponding to the initial equivalent load;
Based on the same-phase load spectrum at the wheel center of the suspension system, obtaining a first bench durable fatigue damage corresponding to a dangerous area of the suspension system;
obtaining a second rack durable fatigue damage corresponding to a dangerous area of the suspension system based on an initial equivalent load obtained by performing pseudo damage equivalent according to an in-phase load spectrum at the center of a wheel of the suspension system;
and obtaining a first fatigue damage ratio corresponding to the dangerous area of the suspension system based on the first and second fatigue damage of the first and second stages corresponding to the dangerous area of the suspension system.
In a second aspect, the present application provides an automotive suspension system bench endurance test load programming apparatus, the apparatus comprising:
the characteristic road surface load spectrum acquisition module is used for intercepting and acquiring characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
the same-phase load spectrum acquisition module is used for acquiring corresponding same-phase load spectrums at the wheel centers of the suspension system based on the phase difference of the characteristic road surface load spectrums at the wheel centers of the left wheel center and the right wheel center of different characteristic road surfaces;
the initial equivalent load primary optimization module is used for obtaining a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks based on the same-phase load spectrum at the center of the suspension system and the corresponding initial equivalent load, and performing primary optimization on the initial equivalent load so that the first fatigue damage ratio is in a primary optimization preset range;
The rack endurance fatigue total damage acquisition module is used for carrying out linear superposition on the rack endurance analysis results under the initial equivalent load effect of each load component after the first-stage optimization to obtain rack endurance fatigue total damage corresponding to the suspension system dangerous area;
the initial equivalent load secondary optimization module is used for performing secondary optimization on the initial equivalent load based on the total fatigue damage of the bench corresponding to the dangerous area of the suspension system and the total fatigue damage of the road test obtained according to the load spectrum of the test field at the center of the wheel of the suspension system, so that the ratio of the total fatigue damage of the bench to the total fatigue damage of the road test is within a second-level optimization preset range.
The beneficial effects that technical scheme that this application provided brought include:
according to the method and the device for testing the load spectrum of the wheel center, the damage consistency correlation between the working condition of the whole vehicle test field and the working condition of the endurance test of the bench can be established, the endurance performance of the suspension system can be accurately verified through the simple double-acting cylinder bench, the defect that the sine wave load input by a five-working-condition multi-axis loading method is not correlated with the road spectrum load of the test field is overcome, and the defect that the phase relation of loads in all directions of the left wheel center and the right wheel center is not considered in the load spectrum of single-axis loading is overcome.
The load compiled by the embodiment of the application can be loaded through a simple double-actuating-cylinder bench, the loading method is simple, the test cost is low, and the defects of complexity and high cost of a multi-axis road simulation method are overcome.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a method for programming a load for a endurance test of an automotive suspension system bench provided in an embodiment of the present application;
FIG. 2 is a schematic flow chart of a method for programming a load for a bench endurance test of an automotive suspension system provided in an embodiment of the application;
FIG. 3 is a table of load phases at the center of a suspension system wheel in the method for programming a endurance test load for an automotive suspension system stand provided in an embodiment of the present application;
fig. 4 is a block diagram of a device for compiling a endurance test load of an automotive suspension system stand according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a method and a device for compiling a load of a bench endurance test of an automotive suspension system, which are used for establishing the damage consistency correlation between the working condition of a whole vehicle test field and the working condition of the bench endurance test, improving the reliability of compiling an equivalent load and overcoming the defects of the conventional bench endurance test of the suspension system.
In order to achieve the technical effects, the general idea of the application is as follows:
a method for programming a durability test load of an automotive suspension system bench comprises the following steps:
s1, intercepting and obtaining characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
S2, obtaining corresponding in-phase load spectrums at wheel centers of the suspension system based on phase differences of the characteristic road load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces;
s3, based on the same-phase load spectrum at the center of a wheel of the suspension system and the corresponding initial equivalent load, obtaining a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks, and performing first-stage optimization on the initial equivalent load, so that the first fatigue damage ratio is in a first-stage optimization preset range;
s4, carrying out linear superposition on the analysis result of the rack endurance under the action of the initial equivalent load of each load component after the first-stage optimization to obtain the total damage of the rack endurance fatigue corresponding to the dangerous area of the suspension system;
s5, performing second-level optimization on the initial equivalent load based on the total fatigue damage of the bench corresponding to the dangerous area of the suspension system and the total fatigue damage of the road test obtained according to the load spectrum of the test field at the wheel center of the suspension system, so that the ratio of the total fatigue damage of the bench to the total fatigue damage of the road test is within a second-level optimization preset range.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 to 3, an embodiment of the present application provides a method for compiling a load for a durability test of a truck suspension system, the method comprising the steps of:
s1, intercepting and obtaining characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
s2, obtaining corresponding in-phase load spectrums at wheel centers of the suspension system based on phase differences of the characteristic road load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces;
s3, based on the same-phase load spectrum at the center of a wheel of the suspension system and the corresponding initial equivalent load, obtaining a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks, and performing first-stage optimization on the initial equivalent load, so that the first fatigue damage ratio is in a first-stage optimization preset range;
s4, carrying out linear superposition on the analysis result of the rack endurance under the action of the initial equivalent load of each load component after the first-stage optimization to obtain the total damage of the rack endurance fatigue corresponding to the dangerous area of the suspension system;
s5, performing second-level optimization on the initial equivalent load based on the total fatigue damage of the bench corresponding to the dangerous area of the suspension system and the total fatigue damage of the road test obtained according to the load spectrum of the test field at the wheel center of the suspension system, so that the ratio of the total fatigue damage of the bench to the total fatigue damage of the road test is within a second-level optimization preset range.
It should be noted that, in the prior art, single-axis loading and multi-axis loading are mostly adopted, and the conditions are as follows:
first, uniaxial loading: the single-shaft loading is to sequentially load sine wave loads in all directions at the wheel center of the suspension system by adopting a single hydraulic actuating cylinder;
the method is simple to operate, low in equipment cost and low in test cost, but is simple to convert the multiaxial problem into various independent uniaxial loading problems, the loaded sine wave load is obtained by equivalent conversion of pseudo damage of road spectrum loads of all channels, the load has certain relevance with the road spectrum of a test field, the phase relation of loads in all directions of left and right wheel centers is not considered, the load is inconsistent with the actual stress condition of the test field, the response of the structural characteristics of parts to the load is not considered, and the test result accuracy is low.
Second, multiaxial loading: the multi-axis road simulation adopts an axis coupling bench test device to load actual road spectrum loads at left and right wheel centers of a suspension system, and the test working conditions and the test field road endurance test have consistent relevance.
The technical means is that road spectrum acquisition of a real vehicle test field is necessary, the acquired signals not only have six component forces of the wheel center, but also comprise wheel center acceleration signals, shock absorber tower seat acceleration signals, displacement signals of springs and measuring point strain signals of all components of a suspension, the signals are used as target iteration output shaft coupling test equipment driving signals before a test, the whole test process is complex, the situation that the driving signal iteration process is not converged exists, the shaft coupling bench test equipment is quite expensive, and the shaft coupling bench test cost is quite high.
The multi-axis sine wave loading is generally to load the left wheel center and the right wheel center of the suspension system with one-way sine wave load by adopting double actuating cylinders, the test method is simple to operate, the equipment cost is low, the test cost is low, the phase difference of the one-way load at the left wheel center and the right wheel center is usually considered, but the association degree of the loaded sine wave load and the road spectrum load of the whole vehicle test field is not high, and the test result accuracy is not high.
There are two current methods for defining multiaxial sine wave load, one is five working conditions established by a host factory according to experience: the load of each working condition is determined according to an empirical formula, and the load is not directly related to the road load of a whole vehicle test field;
the method is characterized in that the load obtained by the method has a certain correlation with the road spectrum load of the whole vehicle test field, but the structural characteristics of parts are not considered to respond to the load, the load has no consistent correlation with the damage, and the conditions of overload, insufficient assessment and inconsistent part failure modes and the endurance test of the road of the test field can occur.
In summary, the overall flow of the technical scheme of the embodiment of the application is as follows:
acquiring a test field load spectrum at the center of a wheel of a suspension system corresponding to a test field road;
intercepting and obtaining characteristic road surface load spectrums at the wheel center of the suspension system corresponding to different characteristic road surfaces in a road of a test field from the load spectrums at the wheel center of the suspension system;
based on the phase difference of the characteristic road load spectrum at the wheel center of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, obtaining corresponding phase differences, and integrating to obtain corresponding load phase tables;
based on the load phase table, carrying out linear superposition recombination on the same load component with the phase difference to obtain a corresponding same-phase load spectrum at the center of a suspension system wheel;
performing pseudo damage equivalence based on the same-phase load spectrum at the center of a wheel of the suspension system to obtain a corresponding initial equivalent load;
based on the same-phase load spectrum at the center of the wheel of the suspension system and the corresponding initial equivalent load, carrying out virtual endurance analysis on the suspension system to obtain a first rack endurance fatigue damage and a second rack endurance fatigue damage corresponding to a dangerous area of the suspension system;
based on the first rack durable fatigue damage and the second rack durable fatigue damage corresponding to the suspension system dangerous area, a first fatigue damage ratio corresponding to the two rack durable fatigue damage is obtained, and the initial equivalent load is optimized for the first stage, so that the first fatigue damage ratio is in a first-stage optimization preset range;
Carrying out linear superposition on the analysis result of the rack endurance under the action of the initial equivalent load of each load component after the first-stage optimization to obtain the total damage of the rack endurance fatigue corresponding to the dangerous area of the suspension system;
based on a test field load spectrum at the wheel center of the suspension system, obtaining the total endurance fatigue damage of the road test;
and performing second-stage optimization on the initial equivalent load subjected to the first-stage optimization, so that a second fatigue damage ratio of the total endurance fatigue damage of the rack to the total endurance fatigue damage of the road test is within a second-stage optimization preset range.
According to the method and the device for testing the load spectrum of the wheel center, the damage consistency correlation between the working condition of the whole vehicle test field and the working condition of the endurance test of the bench can be established, the endurance performance of the suspension system can be accurately verified through the simple double-acting cylinder bench, the defect that the sine wave load input by a five-working-condition multi-axis loading method is not correlated with the road spectrum load of the test field is overcome, and the defect that the phase relation of loads in all directions of the left wheel center and the right wheel center is not considered in the load spectrum of single-axis loading is overcome.
In addition, the load compiled based on the technical scheme of the embodiment of the application can be loaded through a simple double-acting cylinder rack, the loading method is simple, the test cost is low, and the defects of complexity and high cost of a multi-axis road simulation method are overcome.
It should be noted that, in order to facilitate understanding of the technical solution, the technical terms related to the technical solution in the embodiments of the present application are appropriately described:
first, damage: fatigue failure of a structure is a linear cumulative process, and when damage accumulation tends to the inherent life of a material, the component will undergo fatigue failure, and the S-N curve formula of the material:
S＝C×N f b wherein S is the stress cycle range of the structure, N f Number of failure cycles, C fatigue strength coefficient, b fatigue strength index.
Stress S at different levels i Corresponding failure cycle number N fi Stress S at different levels i Action n i Cumulative damage value D corresponding to the next time:
in the middle of
Second, pseudo-injury: unlike the real damage described above, the pseudo damage does not take the response of the structure into account, but only takes generalized loads such as force, moment, acceleration and displacement as input, and calculates the relative damage of the load in combination with the material S-N curve.
Third, pseudo-injury equivalent: based on the principle that the pseudo damage is equal, the random road spectrum of each channel obtained by the road endurance test of the test field is converted into the equivalent load of the corresponding single-stage or multi-stage sine wave cycle.
Further, the method for obtaining the same phase load spectrum at the wheel center of the corresponding suspension system based on the phase difference of the load spectrum at the wheel center of the corresponding suspension system at the left wheel center and the right wheel center of different characteristic roads by linearly overlapping and recombining the same load component with the same phase difference comprises the following steps:
Aiming at characteristic road surface load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, carrying out phase division to obtain three phase differences corresponding to preset load components;
based on the corresponding phase differences of the three preset load components, integrating to obtain a corresponding load phase table;
adding the cycle number of different characteristic pavements to the load phase table; wherein, the liquid crystal display device comprises a liquid crystal display device,
the three preset load components are FX, FY and FZ respectively;
the phase difference comprises 0 DEG, 180 DEG and delta DEG, wherein the phase difference of 0 DEG indicates the same-phase movement of the left wheel and the right wheel, the phase difference of 180 DEG indicates the reverse movement of the left wheel and the right wheel, the phase difference of delta indicates the movement of a single wheel, and the other wheel only bears the vertical half-load shaft load.
Further, based on the phase difference of the characteristic road surface load spectrum at the wheel center of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, the same load component with the same phase difference is subjected to linear superposition recombination, and the corresponding same phase load spectrum at the wheel center of the suspension system is obtained, wherein the method comprises the following steps:
based on the pseudo damage of load spectrums of three preset load components corresponding to left and right wheel centers of different characteristic road surfaces, selecting the load spectrum of the wheel center with the largest pseudo damage as the same-phase wheel center load corresponding to the preset load component of the wheel center of the suspension system;
Aiming at the same-phase wheel center load, the same-phase load spectrum at the wheel center of the suspension system corresponding to each load component combination is obtained according to the linear superposition of the circle number specified in the road spectrum acquisition specification of the test field.
Further, based on the same phase load spectrum at the wheel center of the suspension system and an initial equivalent load obtained by performing pseudo damage equivalent according to the same phase load spectrum at the wheel center of the suspension system, the method respectively obtains the first rack durable fatigue damage corresponding to the dangerous area of the suspension system, the second rack durable fatigue damage and the corresponding first fatigue damage ratio, and comprises the following steps:
performing road test durability simulation analysis on the suspension system to determine a dangerous area of the suspension system;
carrying out rain flow statistics on the same-phase load spectrum at the wheel center of the suspension system to obtain a corresponding load amplitude-average value-frequency matrix;
calculating to obtain pseudo damage corresponding to each matrix unit in the load amplitude-average value-frequency matrix;
summing the pseudo injuries corresponding to each matrix unit in the load amplitude-average value-frequency matrix to obtain pseudo injuries corresponding to the same-phase load spectrum at the wheel center of the suspension system;
calculating and obtaining the cycle number corresponding to the initial equivalent load based on the maximum load amplitude in the load amplitude-average value-frequency matrix;
Obtaining initial equivalent load corresponding to the same-phase load spectrum at the wheel center of the suspension system based on the pseudo damage corresponding to the same-phase load spectrum at the wheel center of the suspension system and the cycle number corresponding to the initial equivalent load;
based on the same-phase load spectrum at the wheel center of the suspension system, obtaining a first bench durable fatigue damage corresponding to a dangerous area of the suspension system;
obtaining a second rack durable fatigue damage corresponding to a dangerous area of the suspension system based on an initial equivalent load obtained by performing pseudo damage equivalent according to an in-phase load spectrum at the center of a wheel of the suspension system;
and obtaining a first fatigue damage ratio corresponding to the dangerous area of the suspension system based on the first and second fatigue damage of the first and second stages corresponding to the dangerous area of the suspension system.
Further, in the pseudo damage corresponding to each matrix unit in the load amplitude-average-frequency matrix, taking the same-phase load spectrum FX-0 ° as an example, the pseudo damage calculation formula corresponding to each matrix unit in the load amplitude-average-frequency matrix is as follows:
in the method, in the process of the invention,wherein, the liquid crystal display device comprises a liquid crystal display device,
DFX_0° ij for pseudo-injury corresponding to matrix unit, nX0 DEG ij FX_0 DEG for the number of cycles corresponding to the matrix element ij The load amplitude corresponding to the matrix unit, b is the fatigue strength index, and C is the fatigue strength coefficient.
Further, the method comprises the steps of summing the pseudo damage corresponding to each matrix unit in the load amplitude-average value-times matrix to obtain a pseudo damage corresponding to the same-phase load spectrum at the center of a wheel of the suspension system, taking FX-0 DEG as an example, and further comprising a pseudo damage summing calculation formula corresponding to each matrix unit in the load amplitude-average value-times matrix:
in the method, in the process of the invention,b is the fatigue strength index.
Further, taking the same phase load spectrum FX-0 degree as an example, the method further comprises a cycle number calculation formula corresponding to the initial equivalent load in the cycle number corresponding to the initial equivalent load obtained by calculation based on the maximum load amplitude in the load amplitude-average value-frequency matrix:
wherein, the liquid crystal display device comprises a liquid crystal display device,
lc_x0° is the number of cycles corresponding to the initial equivalent load;
the initial equivalent load corresponding to the preset phase load spectrum FX_0 DEG is FX_0 DEG eq ＝A*FX_0° max A is a preset load factor.
Further, the linear superposition of the analysis result of the rack endurance under the action of the initial equivalent load after the first-stage optimization of each load component is performed to obtain the linear superposition formula of the rack endurance fatigue total damage corresponding to the dangerous area of the suspension system:
D Ni test＝w 1 *D Ni X eq _0°+w 2 *D Ni X eq _180°+w 3 *D Ni X eq _Δ+w 4 *D Ni Y eq _0°+w 5 *D Ni Y eq _180°+w 6 *D Ni Y eq _Δ+w 7 *D Ni Z eq _0°+w 8 *D Ni Z eq _180°+w 9 *D Ni Z eq delta; wherein, the liquid crystal display device comprises a liquid crystal display device,
w 1 、w 2 …w 9 The initial value of the adjustment coefficient is 1;
D Ni X eq _0°is a bench endurance fatigue damage under the action of initial equivalent load corresponding to the FX-0 DEG of the same phase load spectrum;
D Ni X eq 180 DEG is the durable fatigue damage of the bench under the action of initial equivalent load corresponding to the in-phase load spectrum FX-180 DEG;
D Ni X eq delta is the durable fatigue damage of the bench under the action of initial equivalent load corresponding to the FX-delta of the same-phase load spectrum;
D Ni Y eq 0 DEG is the durable fatigue damage of the rack under the action of initial equivalent load corresponding to the same-phase load spectrum FY-0 DEG;
D Ni Y eq 180 DEG is the durable fatigue damage of the rack under the action of initial equivalent load corresponding to the same phase load spectrum FY-180 DEG;
D Ni Y eq delta is the durable fatigue damage of the rack under the action of initial equivalent load corresponding to the in-phase load spectrum FY-delta;
D Ni Z eq 0 DEG is the durable fatigue damage of the rack under the action of initial equivalent load corresponding to the same-phase load spectrum FZ-0 DEG;
D Ni Z eq 180 DEG is the durable fatigue damage of the rack under the action of initial equivalent load corresponding to the same phase load spectrum FZ-180 DEG;
D Ni Z eq delta is the durable fatigue damage of the rack under the action of initial equivalent load corresponding to the in-phase load spectrum FZ-delta;
D Ni test is the total damage of the endurance fatigue of the rack in the dangerous area of the suspension system under the action of the initial equivalent load of each load component after the first-stage optimization.
In summary, in order to obtain a bench endurance test load of a suspension system, in the technical scheme of the embodiment of the application, a road spectrum of a test field at a wheel center of the suspension system is subjected to phase division, and phase differences of load components FX, FY and FZ at the wheel center of the suspension system corresponding to different characteristic roads are three phase differences of 0 °,180 ° and delta;
wherein, the phase difference of 0 degrees represents the same phase movement of the left wheel and the right wheel, the phase difference of 180 degrees represents the reverse movement of the left wheel and the right wheel, the phase difference of delta represents the movement of a single wheel, and the other wheel only bears the vertical half-load axle load.
In addition, in the technical scheme of the embodiment of the application, for the same load component of the same suspension system on the same characteristic road surface, the load spectrum of the side wheel center with large pseudo damage is selected as the same-phase wheel center load of the load component of the suspension system wheel center, and the same-phase linear superposition of the load components with the same phase difference is performed according to the circle number specified in the road spectrum acquisition specification of the test field, so that 9 kinds of same-phase load spectrums at the wheel centers of the suspension systems of X-0 degrees, FX-180 degrees, FX-delta, FY-0 degrees, FY-180 degrees, FZ-0 degrees, FZ-180 degrees and FZ-delta are formed.
Based on the technical scheme of the embodiment of the application, a specific implementation flow is provided, and the specific operation flow is as follows:
Step 1, obtaining a road spectrum of a test field at the center of a wheel of a suspension system:
the method comprises the steps of installing a six-component force acquisition instrument and various sensors such as acceleration signals, displacement signals, strain signals and the like on a real vehicle, and directly acquiring wheel center six-component force signals in a test field according to the whole vehicle road endurance test specification; the road endurance load at the wheel center can be directly extracted by combining the virtual test field technology and the whole vehicle road endurance test standard to operate the multi-body dynamics model.
Step 2, intercepting load spectrums of test fields at wheel centers of suspension systems corresponding to different characteristic road surfaces:
and (3) according to the road spectrum acquisition specification of the test field, combining the GPS, the road spectrum signal characteristics and the vehicle speed information, and intercepting the load spectrum of the road spectrum load of the test field at the wheel center of the suspension system obtained in the step (1) on the road surfaces with different characteristics.
Step 3: the phases of the load spectrums of the test fields at the left wheel center and the right wheel center of the suspension system corresponding to different characteristic road surfaces are different, and the load spectrums of the test fields at the left wheel center and the right wheel center of the suspension system corresponding to different characteristic road surfaces are required to be subjected to phase division in order to accurately simulate the actual running working conditions.
It should be noted that the specific operation of step 3 is as follows:
step 31: combining the road spectrum signals of the test field at the left wheel center and the right wheel center and the road surface characteristic information, and dividing the phase differences of the load components FX, FY and FZ at the left wheel center and the right wheel center corresponding to different characteristic road surfaces obtained in the step 2 into three phase differences of 0 DEG, 180 DEG and delta;
Wherein, 0 DEG phase difference represents the same phase movement of the left and right wheels, 180 DEG phase difference represents the reverse movement of the left and right wheels, delta phase difference represents the movement of a single wheel, and the other wheel only bears the vertical half-load axle load.
Step 32: and (3) arranging and summarizing three load component phase differences at the wheel center of the suspension system corresponding to different characteristic pavements determined in the step (31) to form a load phase table, and adding the cycle number corresponding to the characteristic pavements to the load phase table in combination with the test field road spectrum acquisition specification.
Step 4: in order to reduce the number of load working conditions of the bench test and further reduce the difficulty and cost of the bench test, the same load component with phase difference needs to be subjected to linear superposition recombination according to the cycle number specified in the road spectrum acquisition specification of the test field.
It should be noted that the specific operation of step 4 is as follows:
step 41: and (3) for the same characteristic pavement, certain difference exists in the load amplitude levels of the same load components at the left wheel center and the right wheel center of the same suspension system, the pseudo damage of the load spectrums corresponding to the load components FX, FY and FZ at the left wheel center and the right wheel center of the suspension system corresponding to different characteristic pavements obtained in the step (2) is calculated, and the load spectrum of the wheel center with the large pseudo damage on one side is selected as the same-phase wheel center load of the load component of the wheel center of the suspension system.
Step 42: for the same wheel center load component of the same suspension system, determining the same-phase wheel center load in the step 41 with the same phase difference, and linearly superposing the same-phase wheel center load according to the cycle number specified in the road spectrum acquisition specification of the test field to sequentially form 9 kinds of wheel center same-phase load spectrums of the suspension system, namely FX-0 °, FX-180 °, FX-delta, FY-0 °, FY-180 °, FY-delta, FZ-0 °, FZ-180 ° and FZ-delta.
Step 5: the damage equivalent and load optimization of the same-phase load spectrum at the wheel center of the suspension system are carried out, and the dangerous area is determined by the road test durability simulation analysis of the suspension system;
then carrying out pseudo-damage equivalence on the same-phase load spectrum to determine a corresponding initial equivalent load;
and then comparing and analyzing the same-phase load spectrum and the damage value of the dangerous area of the virtual endurance analysis result of the suspension system under the action of the corresponding initial equivalent load, if the first fatigue damage ratio is within the threshold range, receiving the load, otherwise, optimizing the initial equivalent load until the first fatigue damage ratio meets the threshold requirement.
It should be noted that the specific operation of step 5 is as follows:
step 51: a road test durability simulation analysis is performed on the suspension system to determine a hazard zone of the suspension system:
Adopting finite element analysis software such as Hyperworks to establish a finite element analysis model of a suspension system, respectively applying X, Y, Z, TX, TY, TZ six-direction unit forces at the joints of a fully-constrained suspension and a white body to perform finite element analysis at the left wheel center and the right wheel center to obtain a unit force stress response result of the suspension system, respectively inputting the unit force response result into a test field road spectrum load at the wheel center corresponding to the characteristic road surface obtained in the step 2, respectively inputting the test field road spectrum load at the wheel center corresponding to the characteristic road surface obtained in the step 2, combining a material SN curve of the suspension system and a test field road spectrum acquisition specification to obtain the cycle number corresponding to the characteristic road surface, adopting fatigue analysis software such as Femfat to calculate and obtain fatigue damage of each part of the suspension system, and extracting node number N of a dangerous area in the test durability analysis result i Fatigue damage value D corresponding to the same Ni 。
Step 52: and (3) carrying out rain flow statistics on the same-phase load spectrum FX-0 DEG at the wheel center of the suspension system obtained in the step (4) to obtain a corresponding load amplitude-average value-frequency matrix, wherein the load amplitude-average value-frequency matrix is used for load pseudo damage analysis and calculation in the subsequent step.
Also, taking FX-0 as an example, the corresponding in-phase load matrix is given as shown in Table one below:
TABLE 1
Step 53: calculating pseudo damage corresponding to the load of each unit of the matrix obtained in the step 52, wherein the load amplitude corresponding to each unit of the matrix is FX_0 DEG respectively ij The corresponding cycle number is nX0 DEG ij Material S-N curve formula: s=c×n f b ，
Wherein S is the stress cycle range of the structure, N f Number of failure cycles, C fatigue strength coefficient, b fatigue strength index.
Stress at different levels S i Corresponding failure cycle number N fi Stress S at different levels i Action n i Cumulative damage value D corresponding to the next time:
in the middle of
The pseudo-impairments corresponding to each cell load in the matrix are:
step 54: calculating a pseudo-damage DX_0 DEG corresponding to the same-phase load spectrum FX-0 DEG at the center of a wheel of the suspension system, namely summing the pseudo-damage corresponding to the load of each unit in the matrix:
step 55: extracting the load according to the load amplitude-average value-frequency matrix obtained in the step 52Maximum load amplitude FX_0 DEG in load amplitude-mean-times matrix max The initial equivalent load corresponding to the preset phase load spectrum FX-0 DEG is FX_0 DEG eq ＝A*FX_0° max A is a preset load coefficient, and the load selection rack endurance test cycle number LC_X0 DEG is set, so that the following principle is based on the equivalent principle of pseudo damage:
then the number of cycles lc_x0° corresponding to the initial equivalent load is calculated:
Step 56: and 54, pseudo damage equivalent calculated initial equivalent load only considers load level, and further virtual durability simulation analysis of the same-phase load spectrum FX-0 degrees of the suspension system and the corresponding initial equivalent load FX-0 degrees is needed to be carried out so as to consider the influence of the structure of the suspension system on load response. Based on the finite element analysis model of the suspension system obtained in the step 51, the joint of the fully-constrained suspension and the white body is respectively applied with X-direction unit force at the centers of the left wheel and the right wheel to carry out finite element analysis, so as to obtain the stress response result of the suspension system in the X-direction unit force, and then the stress response result is respectively matched with the same-phase load spectrum FX-0 degrees and the corresponding initial equivalent load FX_0 degrees eq Correlating, combining a material SN curve of the suspension system, calculating a road test endurance analysis result of the same phase load spectrum FX-0 degrees of the suspension system and fatigue damage of each part of the suspension system corresponding to the corresponding initial equivalent load, and extracting a fatigue damage value D of the road test endurance analysis result of the same phase load spectrum of the dangerous area node Ni determined in the step 51 Ni X_0 DEG and fatigue damage value D of corresponding bench endurance analysis result Ni X eq 0 DEG, i.e. first and second stage endurance fatigue damage, first fatigue damage ratio of node Ni Δr is a preset threshold, and Δr indicates the error accuracy of the equivalent load; otherwise, the initial equivalent load is optimized, namely the cycle times and the corresponding load amplitude of the initial equivalent load are adjusted until the first fatigue damage ratio R of the node Ni Ni X_0°≤ΔR。
Step 57: and repeating the steps 52-56, and sequentially completing the determination of initial equivalent loads of FX-180 degrees, FX-delta degrees, FY-0 degrees, FY-180 degrees, FY-delta degrees, FZ-0 degrees, FZ-180 degrees and FZ-delta degrees of the in-phase load spectrum.
Step 6: initial equivalent load optimization corresponding to the same phase load spectrum:
because the initial equivalent load of each load component obtained in the step 5 only considers the damage equivalent under the independent action of the load of each channel, and does not consider the coupling action of the load between the channels, the total rack durability and road test durability simulation analysis result of the suspension system needs to be further compared and analyzed, and the initial equivalent load is optimized.
It should be noted that the specific operation of step 6 is as follows:
step 61: and (3) performing total rack durability analysis of the suspension system, namely performing linear superposition on the rack durability analysis results under the action of initial equivalent loads corresponding to the same-phase load spectrums FX-0 degrees, FX-180 degrees, FX-delta, FY-0 degrees, FY-180 degrees, FY-delta, FZ-0 degrees, FZ-180 degrees and FZ-delta obtained in the step (5), wherein the total rack durability fatigue damage corresponding to the dangerous area node Ni in the step (51) is D Ni test, then:
D Ni test＝w 1 *D Ni X eq _0°+w 2 *D Ni X eq _180°+w 3 *D Ni Y eq _Δ+w 4 *D Ni Y eq _0°+w 5 *D Ni Y eq _180°+w 6 *D Ni Y eq _Δ+w 7 *D Ni Z eq _0°+w 8 *D Ni Z eq _180°+w 9 *D Ni Z eq _Δ
wherein: w (w) 1 、w 2 …w 9 For the corresponding adjustment coefficient of each equivalent load, the value range is specifically takenEnclose as [0,2]The method can be used for further reducing the bench test working condition and adjusting the equivalent load, and when the adjustment coefficient is set to be the initial value: w (w) 1 ＝w 2 ＝…＝w 9 ＝1，
D Ni test is the total damage of the endurance fatigue of the rack under the action of the initial equivalent load corresponding to the dangerous area node Ni in the step 51.
Step 62: the total damage D of the durable fatigue of the rack under the action of the initial equivalent load corresponding to the node Ni obtained in the step 61 is obtained Ni test, total fatigue damage D of road test durability corresponding to node Ni obtained in step 51 Ni Comparing, if the second fatigue damage ratio under the action of the initial equivalent load corresponding to the node NiThe initial equivalent load may be output as a bench test load; otherwise, the corresponding coefficient of each equivalent load is adjusted until the second fatigue damage ratio R corresponding to the node Ni Ni Meets the preset condition;
and finally, optimizing the amplitude or the cycle number of each equivalent load by combining the adjustment coefficient based on the principle of equal damage, and outputting the optimized equivalent load as a bench test load.
In order to simplify the equivalent load optimization processing process, the technical scheme of the embodiment of the application keeps the equivalent load amplitude unchanged, only the cycle number of the equivalent load is adjusted, and the optimized equivalent load cycle number is the product of the cycle number corresponding to the initial equivalent load and the adjustment coefficient; the road spectrum load of the whole vehicle test field of the suspension system is converted into the bench endurance test load, and the damage consistency correlation between the working condition of the whole vehicle test field and the bench endurance test working condition can be established;
The durability of the suspension system can be accurately verified through the simple double-actuating-cylinder bench, suspension problems in the whole-vehicle road durability test can be recognized in advance, the repeatability of test verification is reduced, the one-time passing rate of the whole-vehicle durability test is improved, the test verification period is shortened, and the test cost is reduced. In addition, the road load of the whole vehicle test field suitable for all structural bearing parts is converted into the durability test load of the bench, and the application range is wide.
Referring to fig. 4, based on the same inventive concept as the method embodiment, the apparatus embodiment provides an apparatus for compiling a endurance test load of a vehicle suspension system gantry, the apparatus comprising:
the characteristic road surface load spectrum acquisition module is used for intercepting and acquiring characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
the same-phase load spectrum acquisition module is used for acquiring corresponding same-phase load spectrums at the wheel centers of the suspension system based on the phase difference of the characteristic road surface load spectrums at the wheel centers of the left wheel center and the right wheel center of different characteristic road surfaces;
the initial equivalent load primary optimization module is used for obtaining a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks based on the same-phase load spectrum at the center of the suspension system and the corresponding initial equivalent load, and performing primary optimization on the initial equivalent load so that the first fatigue damage ratio is in a primary optimization preset range;
The rack endurance fatigue total damage acquisition module is used for carrying out linear superposition on the rack endurance analysis results under the initial equivalent load effect of each load component after the first-stage optimization to obtain rack endurance fatigue total damage corresponding to the suspension system dangerous area;
the initial equivalent load secondary optimization module is used for performing secondary optimization on the initial equivalent load based on the total fatigue damage of the bench corresponding to the dangerous area of the suspension system and the total fatigue damage of the road test obtained according to the load spectrum of the test field at the center of the wheel of the suspension system, so that the ratio of the total fatigue damage of the bench to the total fatigue damage of the road test is within a second-level optimization preset range.
According to the method and the device for testing the load spectrum of the wheel center, the damage consistency correlation between the working condition of the whole vehicle test field and the working condition of the endurance test of the bench can be established, the endurance performance of the suspension system can be accurately verified through the simple double-acting cylinder bench, the defect that the sine wave load input by a five-working-condition multi-axis loading method is not correlated with the road spectrum load of the test field is overcome, and the defect that the phase relation of loads in all directions of the left wheel center and the right wheel center is not considered in the load spectrum of single-axis loading is overcome.
In addition, the load compiled based on the technical scheme of the embodiment of the application can be loaded through a simple double-acting cylinder rack, the loading method is simple, the test cost is low, and the defects of complexity and high cost of a multi-axis road simulation method are overcome.
Further, the load phase table integrating module is further used for carrying out phase division on characteristic road surface load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces to obtain three phase differences corresponding to preset load components;
based on the corresponding phase differences of the three preset load components, integrating to obtain a corresponding load phase table;
adding the cycle number of different characteristic pavements to the load phase table; wherein, the liquid crystal display device comprises a liquid crystal display device,
the three preset load components are FX, FY and FZ respectively;
the phase difference comprises 0 DEG, 180 DEG and delta DEG, wherein the phase difference of 0 DEG indicates the same-phase movement of the left wheel and the right wheel, the phase difference of 180 DEG indicates the reverse movement of the left wheel and the right wheel, the phase difference of delta indicates the movement of a single wheel, and the other wheel only bears the vertical half-load shaft load.
Further, the same-phase load spectrum acquisition module is further used for carrying out phase division on characteristic road surface load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces to obtain three phase differences corresponding to preset load components;
The same-phase load spectrum acquisition module is also used for integrating and acquiring a corresponding load phase table based on the corresponding phase differences of the three preset load components;
the same-phase load spectrum acquisition module is also used for adding the cycle numbers of different characteristic pavements to the load phase table; wherein, the liquid crystal display device comprises a liquid crystal display device,
the three preset load components are FX, FY and FZ respectively;
the phase difference comprises 0 DEG, 180 DEG and delta DEG, wherein the phase difference of 0 DEG indicates the same-phase movement of the left wheel and the right wheel, the phase difference of 180 DEG indicates the reverse movement of the left wheel and the right wheel, the phase difference of delta indicates the movement of a single wheel, and the other wheel only bears the vertical half-load shaft load.
Further, the same-phase load spectrum acquisition module is further used for selecting a load spectrum of a wheel center with the largest pseudo damage on the basis of the pseudo damage of load spectrums of three corresponding preset load components at left and right wheel centers of different characteristic roads as the same-phase wheel center load corresponding to the preset load components of the wheel center of the suspension system;
the same phase load spectrum acquisition module is also used for obtaining the same phase load spectrum at the wheel center of the suspension system corresponding to each load component combination according to the linear superposition of the cycle number specified in the road spectrum acquisition specification of the test field aiming at the same phase wheel center load.
Furthermore, the initial equivalent load primary optimization module is also used for performing road test durability simulation analysis on the suspension system to determine a dangerous area of the suspension system;
the initial equivalent load primary optimization module is also used for carrying out rain flow statistics on the same-phase load spectrum at the center of the wheel of the suspension system to obtain a corresponding load amplitude-average value-frequency matrix;
the initial equivalent load primary optimization module is also used for calculating and obtaining pseudo damage corresponding to each matrix unit in the load amplitude-average value-frequency matrix;
the initial equivalent load primary optimization module is also used for summing the pseudo damage corresponding to each matrix unit in the load amplitude-average value-frequency matrix to obtain the pseudo damage corresponding to the same-phase load spectrum at the center of the suspension system;
the initial equivalent load primary optimization module is also used for calculating and obtaining the cycle number corresponding to the initial equivalent load based on the maximum load amplitude in the load amplitude-mean-times matrix;
the initial equivalent load primary optimization module is also used for obtaining the initial equivalent load corresponding to the same-phase load spectrum at the wheel center of the suspension system based on the pseudo damage corresponding to the same-phase load spectrum at the wheel center of the suspension system and the cycle number corresponding to the initial equivalent load;
The initial equivalent load primary optimization module is also used for obtaining the durable fatigue damage of the first bench corresponding to the dangerous area of the suspension system based on the same-phase load spectrum at the center of the suspension system;
the initial equivalent load primary optimization module is also used for obtaining a second rack durable fatigue damage corresponding to a suspension system dangerous area based on an initial equivalent load obtained by performing pseudo damage equivalence according to an in-phase load spectrum at the center of a suspension system;
the initial equivalent load primary optimization module is further used for obtaining a first fatigue damage ratio corresponding to the dangerous area of the suspension system based on the first rack durable fatigue damage corresponding to the dangerous area of the suspension system and the second rack durable fatigue damage.
Further, in the pseudo damage corresponding to each matrix unit in the load amplitude-average-frequency matrix, taking the same-phase load spectrum FX-0 ° as an example, the pseudo damage calculation formula corresponding to each matrix unit in the load amplitude-average-frequency matrix is as follows:
in the method, in the process of the invention,wherein, the liquid crystal display device comprises a liquid crystal display device,
DFX_0° ij for pseudo-injury corresponding to matrix unit, nX0 DEG ij FX_0 DEG for the number of cycles corresponding to the matrix element ij The load amplitude corresponding to the matrix unit, b is the fatigue strength index, and C is the fatigue strength coefficient.
Further, the method comprises the steps of summing the pseudo damage corresponding to each matrix unit in the load amplitude-average value-times matrix to obtain a pseudo damage corresponding to the same-phase load spectrum at the center of a wheel of the suspension system, taking FX-0 DEG as an example, and further comprising a pseudo damage summing calculation formula corresponding to each matrix unit in the load amplitude-average value-times matrix:
in the method, in the process of the invention,b is the fatigue strength index.
Further, taking the same phase load spectrum FX-0 degree as an example, the method further comprises a cycle number calculation formula corresponding to the initial equivalent load in the cycle number corresponding to the initial equivalent load obtained by calculation based on the maximum load amplitude in the load amplitude-average value-frequency matrix:
wherein, the liquid crystal display device comprises a liquid crystal display device,
lc_x0° is the number of cycles corresponding to the initial equivalent load;
the initial equivalent load corresponding to the preset phase load spectrum FX_0 DEG is FX_0 DEG eq ＝A*FX_0° max A is a preset load factor.
Further, the linear superposition of the analysis result of the rack endurance under the action of the initial equivalent load after the first-stage optimization of each load component is performed to obtain the linear superposition formula of the rack endurance fatigue total damage corresponding to the dangerous area of the suspension system:
D Ni test＝w 1 *D Ni X eq _0°+w 2 *D Ni X eq _180°+w 3 *D Ni Y eq _Δ+w 4 *D Ni Y eq _0°+w 5 *4D Ni Y eq _180°+w 6 *D Ni Y eq _Δ+w 7 *D Ni Z eq _0°+w 8 *D Ni Z eq _180°+w 9 *D Ni Z eq delta; wherein the term interpretation may be referred to the method embodiments mentioned in the first aspect.
It should be noted that, the technical problems, technical means and technical effects corresponding to the device for programming the endurance test load of the automotive suspension system rack provided by the embodiment of the application are similar to those of the method for programming the endurance test load of the automotive suspension system rack from the principle level.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for programming a durability test load of an automotive suspension system bench, the method comprising the steps of:
intercepting and obtaining characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
based on the phase difference of the characteristic road surface load spectrum at the wheel center of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, obtaining the corresponding same-phase load spectrum at the wheel center of the suspension system;
based on the same-phase load spectrum at the center of the suspension system wheel and the corresponding initial equivalent load, a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks is obtained, and the initial equivalent load is optimized for the first stage, so that the first fatigue damage ratio is in a first-stage optimization preset range;
Carrying out linear superposition on the analysis result of the rack endurance under the action of the initial equivalent load of each load component after the first-stage optimization to obtain the total damage of the rack endurance fatigue corresponding to the dangerous area of the suspension system;
and performing second-stage optimization on the initial equivalent load based on the total endurance fatigue damage of the rack corresponding to the dangerous area of the suspension system and the total endurance fatigue damage of the road test obtained according to the load spectrum of the test field at the wheel center of the suspension system, so that the ratio of the total endurance fatigue damage of the rack to the total endurance fatigue damage of the road test is within a second-stage optimization preset range.
2. The method for compiling the endurance test load of the automotive suspension system bench according to claim 1, wherein the step of linearly superposing and reorganizing the same load component with the same phase difference based on the phase difference of the characteristic road surface load spectrum at the left and right wheel centers of different characteristic road surfaces to obtain the corresponding in-phase load spectrum at the wheel center of the suspension system comprises the following steps:
aiming at characteristic road surface load spectrums at the wheel centers of the suspension system corresponding to the left wheel center and the right wheel center of different characteristic road surfaces, carrying out phase division to obtain three phase differences corresponding to preset load components;
Based on the corresponding phase differences of the three preset load components, integrating to obtain a corresponding load phase table;
adding the cycle number of different characteristic pavements to the load phase table; wherein, the liquid crystal display device comprises a liquid crystal display device,
the three preset load components are FX, FY and FZ respectively;
the phase difference comprises 0 DEG, 180 DEG and delta DEG, wherein the phase difference of 0 DEG indicates the same-phase movement of the left wheel and the right wheel, the phase difference of 180 DEG indicates the reverse movement of the left wheel and the right wheel, the phase difference of delta indicates the movement of a single wheel, and the other wheel only bears the vertical half-load shaft load.
3. The method for programming the endurance test load of the automotive suspension system bench according to claim 2, wherein the method for linearly superposing and recombining the same load components with the same phase difference based on the phase difference of the characteristic road surface load spectrum at the wheel center of the suspension system corresponding to the left and right wheel centers of different characteristic road surfaces to obtain the corresponding in-phase load spectrum at the wheel center of the suspension system comprises the following steps:
based on the pseudo damage of load spectrums of three preset load components corresponding to left and right wheel centers of different characteristic road surfaces, selecting the load spectrum of the wheel center with the largest pseudo damage as the same-phase wheel center load corresponding to the preset load component of the wheel center of the suspension system;
Aiming at the same-phase wheel center load, the same-phase load spectrum at the wheel center of the suspension system corresponding to each load component combination is obtained according to the linear superposition of the circle number specified in the road spectrum acquisition specification of the test field.
4. The method for compiling the endurance test load of the stand of the automotive suspension system according to claim 1, wherein the initial equivalent load obtained by performing pseudo damage equivalence based on the in-phase load spectrum at the center of the wheel of the suspension system and the in-phase load spectrum at the center of the wheel of the suspension system respectively obtains the endurance fatigue damage of the first stand, the endurance fatigue damage of the second stand and the corresponding first fatigue damage ratio corresponding to the dangerous area of the suspension system, and the method comprises the following steps:
performing road test durability simulation analysis on the suspension system to determine a dangerous area of the suspension system;
carrying out rain flow statistics on the same-phase load spectrum at the wheel center of the suspension system to obtain a corresponding load amplitude-average value-frequency matrix;
calculating to obtain pseudo damage corresponding to each matrix unit in the load amplitude-average value-frequency matrix;
summing the pseudo injuries corresponding to each matrix unit in the load amplitude-average value-frequency matrix to obtain pseudo injuries corresponding to the same-phase load spectrum at the wheel center of the suspension system;
Calculating and obtaining the cycle number corresponding to the initial equivalent load based on the maximum load amplitude in the load amplitude-average value-frequency matrix;
obtaining initial equivalent load corresponding to the same-phase load spectrum at the wheel center of the suspension system based on the pseudo damage corresponding to the same-phase load spectrum at the wheel center of the suspension system and the cycle number corresponding to the initial equivalent load;
based on the same-phase load spectrum at the wheel center of the suspension system, obtaining a first bench durable fatigue damage corresponding to a dangerous area of the suspension system;
obtaining a second rack durable fatigue damage corresponding to a dangerous area of the suspension system based on an initial equivalent load obtained by performing pseudo damage equivalent according to an in-phase load spectrum at the center of a wheel of the suspension system;
and obtaining a first fatigue damage ratio corresponding to the dangerous area of the suspension system based on the first and second fatigue damage of the first and second stages corresponding to the dangerous area of the suspension system.
5. The method for constructing a load for a durability test of a suspension system of an automobile according to claim 4, wherein in the calculating and obtaining of the pseudo damage corresponding to each matrix unit in the load amplitude-average-number matrix, taking the same-phase load spectrum FX-0 ° as an example, the calculating formula of the pseudo damage corresponding to each matrix unit in the load amplitude-average-number matrix is:
In the method, in the process of the invention,wherein, the liquid crystal display device comprises a liquid crystal display device,
DFX_0° ij for pseudo-injury corresponding to matrix unit, nX0 DEG ij FX_0 DEG for the number of cycles corresponding to the matrix element ij The load amplitude corresponding to the matrix unit, b is the fatigue strength index, and C is the fatigue strength coefficient。
6. The method for programming a load for a durability test of a vehicle suspension system according to claim 4, wherein the method for programming the load for the durability test of the vehicle suspension system is characterized by summing up the pseudo injuries corresponding to each matrix unit in the load amplitude-average-number matrix to obtain a pseudo injury corresponding to the same-phase load spectrum at the center of a wheel of the suspension system, taking the same-phase load spectrum FX-0 ° as an example, and further comprising a calculation formula for summing up the pseudo injuries corresponding to each matrix unit in the load amplitude-average-number matrix:
b is the fatigue strength index.
7. The method for programming a load for a durability test of a vehicle suspension system according to claim 4, wherein, in calculating the cycle number corresponding to the initial equivalent load based on the maximum load amplitude in the load amplitude-average-number matrix, taking the same phase load spectrum FX-0 ° as an example, the method further comprises a calculation formula of the cycle number corresponding to the initial equivalent load:
wherein, the liquid crystal display device comprises a liquid crystal display device,
lc_x0° is the number of cycles corresponding to the initial equivalent load;
the initial equivalent load corresponding to the preset phase load spectrum FX_0 DEG is FX_0 DEG eq ＝A*FX_0° max A is a preset load factor.
8. The method for compiling a load for a durability test of a vehicle suspension system according to claim 1, wherein the linear superposition of the results of the analysis of the durability of the stage under the action of the initial equivalent load of each load component after the first-stage optimization is performed to obtain the linear superposition formula of the total damage of the durability fatigue of the stage corresponding to the dangerous area of the suspension system, further comprises:
D Ni test＝w 1 *D Ni X eq _0°+w 2 *D Ni X eq _180°+w 3 *D Ni X eq _Δ+W 4 *D Ni Y eq _0°+w 5 *D Ni Y eq _180°+w 6 *D Ni Y eq _Δ+w 7 *D Ni Z eq _0°+w 8 *D Ni Z eq _180°+w 9 *D Ni Z eq delta; wherein, the liquid crystal display device comprises a liquid crystal display device,
w 1 、w 2 …w 9 the initial value of the adjustment coefficient is 1;
D Ni X eq _0°、D Ni X eq _180°、D Ni X eq _Δ、D Ni Y eq _0°、D Ni Y eq _180°、D Ni Y eq _Δ、D Ni Z eq _0°、D Ni Z eq 180 DEG and D Ni Z eq The _delta is respectively the permanent fatigue damage of the bench under the action of initial equivalent loads corresponding to the in-phase load spectrums FX-0 degrees, FX-180 degrees, FX-delta, FY-0 degrees, FY-180 degrees, FY-delta, FZ-0 degrees, FZ-180 degrees and FZ-delta;
D Ni test is the total damage of the endurance fatigue of the rack in the dangerous area of the suspension system under the action of the initial equivalent load of each load component after the first-stage optimization.
9. An automotive suspension system bench endurance test load programming device, characterized in that the device comprises:
the characteristic road surface load spectrum acquisition module is used for intercepting and acquiring characteristic road surface load spectrums at wheel centers of suspension systems corresponding to different characteristic road surfaces in a road of a test field;
The same-phase load spectrum acquisition module is used for acquiring corresponding same-phase load spectrums at the wheel centers of the suspension system based on the phase difference of the characteristic road surface load spectrums at the wheel centers of the left wheel center and the right wheel center of different characteristic road surfaces;
the initial equivalent load primary optimization module is used for obtaining a first fatigue damage ratio corresponding to the durable fatigue damage of the two racks based on the same-phase load spectrum at the center of the suspension system and the corresponding initial equivalent load, and performing primary optimization on the initial equivalent load so that the first fatigue damage ratio is in a primary optimization preset range;
the rack endurance fatigue total damage acquisition module is used for carrying out linear superposition on the rack endurance analysis results under the initial equivalent load effect of each load component after the first-stage optimization to obtain rack endurance fatigue total damage corresponding to the suspension system dangerous area;
the initial equivalent load secondary optimization module is used for performing secondary optimization on the initial equivalent load based on the total fatigue damage of the bench corresponding to the dangerous area of the suspension system and the total fatigue damage of the road test obtained according to the load spectrum of the test field at the center of the wheel of the suspension system, so that the ratio of the total fatigue damage of the bench to the total fatigue damage of the road test is within a second-level optimization preset range.
10. The load programming device for the endurance test of the stand of the automotive suspension system according to claim 9, wherein the linear superposition of the results of the analysis of the stand endurance under the action of the initial equivalent load of each load component after the first-stage optimization is performed to obtain the linear superposition formula of the total damage of the stand endurance fatigue corresponding to the dangerous area of the suspension system, further comprises:
D Ni test＝w 1 *D Ni X eq _0°+w 2 *D Ni X eq _180°+w 3 *D Ni X eq _Δ+w 4 *D Ni Y eq _0°+w 5 *D Ni Y eq _180°+w 6 *D Ni Y eq _Δ+w 7 *D Ni Z eq _0°+w 8 *D Ni Z eq _180°+w 9 *D Ni Z eq delta; wherein, the liquid crystal display device comprises a liquid crystal display device,
w 1 、w 2 …w 9 the initial value of the adjustment coefficient is 1;
D Ni X eq _0°、D Ni X eq _180°、D Ni X eq _Δ、D Ni Y eq _0°、D Ni Y eq _180°、D Ni Y eq _Δ、D Ni Z eq _0°、D Ni Z eq 180 DEG and D Ni Z eq The _delta is respectively the permanent fatigue damage of the bench under the action of initial equivalent loads corresponding to the in-phase load spectrums FX-0 degrees, FX-180 degrees, FX-delta, FY-0 degrees, FY-180 degrees, FY-delta, FZ-0 degrees, FZ-180 degrees and FZ-delta;
D Ni test is the total damage of the endurance fatigue of the rack in the dangerous area of the suspension system under the action of the initial equivalent load of each load component after the first-stage optimization.
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