CN113626937A - Automobile friction abnormal sound prediction method based on relative displacement and relative speed - Google Patents
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Abstract
The invention relates to the technical field of vehicle friction abnormal sound prediction, in particular to an automobile friction abnormal sound prediction method based on relative displacement and relative speed, which comprises the following steps: marking simulation node pairs on adjacent structures of the finite element model, endowing the simulation node pairs with contact rigidity vertical to a motion plane, applying road spectrum excitation, and acquiring simulation relative displacement and simulation relative speed of the simulation node pairs; marking a test node pair on a material pair with the same adjacent structure, and acquiring the test relative displacement and the test relative speed of the test node pair through a friction abnormal sound test; and generating a prediction result by comparing the simulated relative displacement with the experimental relative displacement and comparing the simulated relative velocity with the experimental relative velocity. By adopting the scheme, the technical problems that whether the structure is redesigned, optimized and tested or not can not be judged according to the sensing condition of the passenger in the car to the friction abnormal sound, development cost is wasted, and the development period is prolonged in the prior art can be solved.
Description
Technical Field
The invention relates to the technical field of vehicle friction abnormal sound prediction, in particular to an automobile friction abnormal sound prediction method based on relative displacement and relative speed.
Background
The abnormal vehicle sound is a phenomenon that two parts at any joint of the vehicles generate impact sound due to vibration or mutual impact, and mainly comprises friction abnormal sound and impact abnormal sound. The common causes of abnormal frictional noise include the occurrence of undesirable relative motion between two components in contact with each other, the incompatibility of friction coefficients between two components in contact with each other, the design of the components is insufficient, and the structural vibration of the abnormal noise sensitive area is excessive. With the popularization of household vehicles, passengers in the vehicle have higher requirements on the quality and the riding experience of the vehicle, so that the abnormal sound of the vehicle also becomes a comprehensive index for measuring the manufacturing quality and the riding comfort of the vehicle.
In the prior art, most abnormal sound tests for vehicles are carried out after sample vehicles are produced, and the sample vehicles are subjected to road tests, so that abnormal sound parts of the vehicles are detected, and the abnormal sound parts are redesigned and optimized. However, the abnormal sound detection needs to be carried out after the production of the sample car, so that the waiting time for the abnormal sound detection is too long, and when the abnormal sound occurs to the sample car, the structure of the car needs to be designed and optimized again, so that the overall development period of the car is too long, and the development cost is increased. Therefore, in order to improve the above problems, the current test for abnormal noise of the vehicle mainly predicts the position of the abnormal friction noise by predicting whether the risk of the abnormal friction noise exists.
At present, the position prediction of the abnormal friction sound is generally to set a detection node pair in an automobile simulation model, apply road spectrum excitation to the automobile simulation model, collect the relative displacement of the detection node pair, simultaneously obtain the abnormal sound displacement of the abnormal friction sound in the test, and when the relative displacement is greater than the abnormal sound displacement, determine the detection node pair as the predicted position of the abnormal friction sound. However, in an actual situation, when a certain detection node pair is located at a position that is determined as a frictional abnormal sound, the abnormal sound emitted by the detection node pair at the position cannot be sensed by an occupant in the vehicle in the use process, that is, the abnormal sound emitted by the detection node pair at the position does not affect the occupant in the vehicle. For the position of the detection node pair, if the detection node pair is designed, optimized and tested again, development cost is wasted, and meanwhile, the overall development period of the vehicle is also prolonged.
Disclosure of Invention
The invention aims to provide an automobile friction abnormal sound prediction method based on relative displacement and relative speed, and aims to solve the technical problems that in the prior art, whether the position is redesigned, optimized and tested cannot be judged according to the sensing condition of an occupant in an automobile on friction abnormal sound, development cost is wasted, and the development period is prolonged.
The basic scheme provided by the invention is as follows: the automobile friction abnormal sound prediction method based on the relative displacement and the relative speed comprises a simulation step, wherein the simulation step comprises the following steps: marking simulation node pairs on adjacent structures of the finite element model, applying road spectrum excitation to the finite element model for simulation, and acquiring simulation relative displacement of the simulation node pairs in the simulation process; also comprises a testing step and an analyzing step, wherein the testing step comprises the following steps: marking a test node pair on a material pair with the same adjacent structure, and acquiring test relative displacement and test relative speed of the test node pair as evaluation standards through a friction abnormal sound test; the simulation step also comprises the steps of obtaining the simulation relative speed of the simulation node pairs in the simulation process, endowing the simulation node pairs with contact rigidity vertical to a motion plane before applying road spectrum excitation, and enabling the motion plane to be the same as the motion plane of an adjacent structure in the friction abnormal sound test; and (3) an analysis step: and generating a prediction result by comparing the simulated relative displacement with the experimental relative displacement and comparing the simulated relative velocity with the experimental relative velocity.
Description of the nouns: the finite element model is a model of an adjacent structure constructed by software in the prior art; the adjacent structures are two parts in contact relation in the automobile; the road spectrum excitation is used for simulating the working condition of an automobile running on different roads in a simulation experiment and is used as the road surface unevenness of automobile vibration input.
The basic scheme has the working principle and the beneficial effects that:
road spectrum excitation is applied to the finite element model for simulation, so that the automobile vibration condition closer to the real driving condition is obtained, the simulation result is closer to the real driving result of the automobile, and the accuracy of the simulation result is improved.
Before applying road spectrum excitation for simulation, the contact stiffness perpendicular to the motion plane is given to the simulation node, and the contact stiffness is given to ensure that the adjacent structures only move on the motion plane in the simulation process, so that the states of the adjacent structures in the simulation step and the test step are consistent, the consistency of the simulation process and the test process is ensured, and the accuracy of a prediction result is improved. Meanwhile, the direction of the contact stiffness is perpendicular to the motion plane, namely, the normal contact stiffness of the simulation node is given, so that the simulation adjacent structures are contacted and extruded with each other, and the adjacent structures move as a whole, namely, when one structure shakes in the motion process, the other structure beats along with the shaking of the structure, so that the interference of impact abnormal sound is eliminated, and the accuracy of a prediction result is improved. In addition, the simulation node is endowed with contact rigidity perpendicular to the motion plane, so that the steps of local rigidity test simulation are reduced, the operation of local rigidity test simulation is complex, and related equipment needs to be debugged by a simulation result, so that the accuracy of the simulation result is difficult to ensure, the operation difficulty of the simulation step is reduced by reducing the steps of local rigidity test simulation, the flow of the simulation step is shortened, and the simulation time is shortened.
The friction abnormal sound test is a mature test in the prior art, the test precision is high, the test result obtained by the friction abnormal sound test is used as the evaluation standard, compared with the method that the index of the automobile is directly used as the evaluation standard, the test result is used as the evaluation standard, the influence factors of the automobile in the driving process are fully considered, the misjudgment condition of analysis and judgment by the evaluation standard is reduced, and the accuracy of the subsequent prediction result is improved.
The simulation results are compared and analyzed through the analysis steps, and because the evaluation standard is a test result and the influence factors of the automobile in the driving process are considered, the probability of misjudgment is reduced, the accuracy of the prediction result is improved, the probability of redesigning, optimizing and testing the adjacent structure where the simulation node is located is reduced, the development cost is effectively saved, and the development period is shortened.
The simulation relative speed and the test relative speed are compared to generate a prediction result, speed indexes are increased, firstly, the prediction is carried out through a plurality of indexes, and the accuracy of the prediction result is improved; and secondly, reflecting the energy of the abnormal friction sound through a speed index, wherein the higher the speed is, the higher the energy of the abnormal friction sound is, the higher the frequency of the abnormal friction sound is, the lower the same speed is, the lower the energy of the abnormal friction sound is, the lower the frequency of the abnormal friction sound is, for the human ear, the audible frequency range is 20 Hz to 20000 Hz, and when the frequency of the abnormal friction sound is lower than the audible frequency of the human ear, the abnormal friction sound can not be perceived by the passenger in the vehicle, namely, the abnormal friction sound can not influence the passenger in the vehicle. The energy of the abnormal friction sound, namely the frequency of the abnormal friction sound, is reflected through the speed index, so that the perception situation of the abnormal friction sound of the passengers in the vehicle can be reflected according to the prediction result generated by the speed index, whether the passengers in the vehicle are redesigned, optimized and tested is judged according to the perception situation of the abnormal friction sound of the passengers in the vehicle, the development cost is further reduced, and the development period is shortened.
Further, the prediction result comprises the absence of abnormal sound risk, the presence of abnormal sound risk without influence and the presence of larger abnormal sound risk, and the analysis step comprises the following steps:
comparing the simulated relative displacement with the test relative displacement in sequence, generating a prediction result without abnormal sound risk when the maximum value of the simulated relative displacement is smaller than the minimum value of the test relative displacement, and comparing the simulated relative speed with the test relative speed when the maximum value of the simulated relative displacement is not smaller than the minimum value of the test relative displacement; when the maximum value of the simulated relative speed is smaller than the minimum value of the test relative speed, a prediction result with abnormal sound risk which does not form influence is generated, and when the maximum value of the simulated relative speed is not smaller than the minimum value of the test relative speed, a prediction result with larger abnormal sound risk is generated.
Has the advantages that: and performing risk judgment by comparing the simulation relative displacement with the test relative displacement, namely judging whether the simulation node pair has a friction abnormal sound risk or not, thereby performing risk division on the simulation node pair. And (4) perception judgment is carried out by comparing the simulation relative speed with the test relative speed, namely whether the simulation node pair can be perceived by passengers in the vehicle is judged, so that perception division is carried out on the simulation node. The simulation nodes are divided into three types through risk judgment and perception judgment, wherein the first type is as follows: the risk of abnormal friction sound does not exist, and the vehicle interior passengers cannot perceive the vehicle interior naturally; the second type: the risk of abnormal friction sound exists, but the abnormal friction sound cannot be sensed by passengers in the vehicle; in the third category: there is a risk of frictional noise, which is perceived by the occupants of the vehicle. Different subsequent operations can be selected for different types of simulation nodes, the simulation nodes are considered to pass prediction and not processed for the first type, recording can be performed for the second type, improvement is performed in the subsequent design and development of other automobiles, and design, optimization and prediction are performed again for the third type. The simulation node pairs which have the risk of abnormal friction sound but cannot be perceived by passengers in the vehicle are acquired through the analysis step, so that the situation that whether the position is redesigned, optimized and tested or not cannot be judged according to the perception situation of the abnormal friction sound of the passengers in the vehicle, development cost is wasted, and the development period is prolonged is avoided.
Further, each set of simulation node pairs comprises two simulation nodes, and the simulation nodes in the same set are located at the edge of the adjacent structure. Has the advantages that: the edge is the position with the largest change range when the adjacent structure is excited by road spectrum, namely the edge is the high risk position with abnormal friction sound, and the high risk position is used for simulation, so that the accuracy of the subsequent prediction result is improved, and the probability of the occurrence of small-probability misjudgment events is reduced.
Furthermore, each group of simulation node pairs comprises two simulation nodes, the adjacent structures are two parts with contact relations, and the simulation nodes in the same group are respectively positioned on the contact surfaces of the two parts. Has the advantages that: the simulation node is arranged on the contact surface, when the friction abnormal sound risk exists, the position of the simulation node is the position of the friction abnormal sound risk, and the position of the friction abnormal sound risk can be accurately and quickly known through the arrangement of the simulation node.
Furthermore, the positions of the simulation nodes in the same group are in one-to-one correspondence. Has the advantages that: the positions of the same group of simulation nodes are in one-to-one correspondence, namely the distance between the two simulation nodes is the simulation relative displacement, so that the difficulty of obtaining the simulation relative displacement is reduced, the simulation relative displacement is convenient to obtain quickly, and the simulation progress is accelerated.
Further, acquiring the simulation relative displacement of the simulation node pair in the simulation process in the simulation step comprises the following steps: and (3) setting a coordinate system for each simulation node, and calculating the simulation relative displacement of the simulation node pair according to the coordinate values of the same set of simulation nodes. Has the advantages that: the coordinate values are given to each simulation node by constructing a coordinate system, and under the condition that the coordinate values of the same group of simulation nodes are known, the simulation relative displacement can be quickly obtained through a distance formula between two points, so that the obtaining is simple, and the simulation process is quickly completed.
Further, when the simulation relative speed of the simulation node pair in the simulation process is obtained in the simulation step, the direction of the simulation relative speed is the direction of the simulation relative displacement of the simulation node pair. Has the advantages that: the simulation relative speed and the simulation relative displacement are kept in the same direction, namely the simulation relative speed and the simulation relative displacement are in one-to-one correspondence, so that the accuracy of a subsequent prediction result is improved.
Further, the contact stiffness is greater than 500N/mm. Has the advantages that: the rigidity of the general soft interior trim is smaller than 10-100N/mm, so that the value of the contact rigidity vertical to the motion plane is larger than 500N/mm and is far larger than the rigidity of a general structure, and the consistency of a simulation process and a test process is ensured.
Drawings
FIG. 1 is a flowchart illustrating a first embodiment of a method for predicting abnormal automobile friction noise based on relative displacement and relative velocity according to the present invention;
FIG. 2 is a graph of simulated relative displacement and experimental relative displacement based on the embodiment of the method for predicting automobile friction abnormal sound based on relative displacement and relative speed of the present invention;
FIG. 3 is a graph of simulated relative velocity and experimental relative velocity based on the embodiment of the method for predicting the automobile friction abnormal sound based on the relative displacement and the relative velocity.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as shown in the attached drawing 1 comprises a simulation step, a test step and an analysis step.
The simulation step specifically comprises the following steps:
the method comprises the steps of establishing a finite element model of two flat plate structural members by using Hypermesh software, wherein the two flat plate structural members are adjacent structures, and establishing the finite element model of the two flat plate structural members is the prior art, so that the repeated description is omitted, and the adjacent structures are two parts with a contact relation in an automobile, namely two parts have contact surfaces. In other embodiments, finite element models of adjacent structures may be constructed from real vehicle structures.
The contact surfaces of two parts of the finite element model are respectively marked with a plurality of simulation nodes, and the contact surfaces are areas where relative displacement of adjacent structures is most likely to occur. The simulation nodes on the contact surfaces of the two parts are in one-to-one correspondence, and the two simulation nodes in one-to-one correspondence form a group of simulation node pairs, namely each group of simulation node pairs comprises two simulation nodes in one-to-one correspondence, and each group of simulation node pairs is numbered and distinguished. In another embodiment, a hash unit may be created between adjacent structures in the finite element model, each hash unit connects two parts, that is, two end points of the hash unit are respectively disposed on the two parts, and the two end points of the hash unit are simulation node pairs.
And adding constraints to the finite element model, wherein the constraints comprise a coordinate system and contact rigidity, a coordinate value is given to each simulation node through the coordinate system, and the relative distance of the simulation node pairs is obtained through the coordinate values. And giving the simulation node pair contact rigidity vertical to a motion plane, wherein the motion plane is the same as the motion plane of the material pair in a subsequent friction abnormal sound test. When the adjacent structures are two parts which are contacted up and down, the motion plane is a horizontal plane, namely an X-Y plane. The contact stiffness is greater than 500N/mm, in this embodiment, the Z contact stiffness is 1000N/mm, and the contact stiffness in the X and Y directions is 0N/mm. In another embodiment, a corresponding local coordinate system is created for each push unit, the local coordinate systems correspond to the push units one to one, the local coordinate systems corresponding to the push units are used as references when the simulation relative displacement and the simulation relative speed are obtained, and the relative displacement and the relative speed of two end points of the push units are the simulation relative displacement and the simulation relative speed. And giving contact rigidity to the length direction of each push unit, wherein the value of the contact rigidity is 1000N/mm, and giving contact rigidity with the value of 0N/mm to the other two directions.
Applying road spectrum excitation to the finite element model, introducing an actual time domain velocity excitation value by using a TABLED1 card, and in other embodiments, introducing an acceleration excitation value, a displacement excitation value and a force excitation value, and finally creating excitation by using an RLOAD2 card, thereby realizing the simulation of applying road spectrum excitation to the finite element model. The road spectrum excitation is used for simulating the working condition of the automobile running on different roads in a simulation experiment and is used as the road surface unevenness of automobile vibration input, so that the details are not repeated. In other embodiments, random excitation may also be applied to the finite element model.
Setting analysis steps and analysis time intervals, defining analysis results output by a simulation experiment as simulation relative displacement and simulation relative speed of all simulation node pairs, importing a finite element model into Nastran software, enabling adjacent structures to move relatively in a motion plane, obtaining analysis results, wherein the analysis results are the relative displacement and the relative speed in a time domain range, the relative displacement is a relative displacement corresponding to each simulation node pair at each analysis moment, and obtaining relative displacement arrays { DXit } and { DYit } of each simulation node pair in the X direction and the Y direction in the motion process of the adjacent structures through the analysis results. Obtaining the simulation relative displacement of the simulation node pairs at the time t according to the following formula, and calculating a simulation relative displacement array { DLit } of each group of simulation node pairs in the whole simulation experiment:
in the formula, DLit is the simulation relative displacement of the ith group of simulation node pairs at the time t, DXit2For the simulation relative displacement of the ith group of simulation node pairs in the X direction at the time t, DYit2And simulating relative displacement of the ith group of simulation nodes in the Y direction at the time t.
The relative speed is a relative speed corresponding to each simulation node pair at each analysis time, namely, the relative speed arrays { VX1t } and { VY1t } of each simulation node pair in the X direction and the Y direction in the motion process of the adjacent structure are obtained through the analysis result. Obtaining the simulation relative speed of the simulation node pairs at the time t according to the following formula, and calculating the simulation relative speed array { VLit } of each group of simulation node pairs in the whole simulation experiment:
where VLit is the simulation relative speed of the ith set of simulation node pairs at time t, Vxit2For the simulation relative speed, VYIt, of the ith group of simulation node pairs in the X direction at the time t2And simulating the relative speed of the ith group of simulation nodes in the Y direction at the time t.
The testing step specifically comprises the following steps:
and acquiring a material pair with the same structure as the adjacent structure in the simulation step for testing, wherein the material pair is a pair of test members with standard sizes, and marking the test node pair on the material pair.
The test component is fixed on a material friction abnormal sound test bed, and a test result is obtained through a friction abnormal sound test, wherein the material friction abnormal sound test bed is test equipment commonly used in the NVH industry, and the structure of the test equipment is not repeated. The method comprises the following steps of obtaining test relative displacement and test relative speed through a friction abnormal sound test, and specifically comprises the following steps: setting test parameters including traction acting force, acting force range, test pressure and the like, fixing a pair of test members through a material friction abnormal sound test bed, stacking the two test members up and down, enabling the two test members to be in close contact with each other by applying the test pressure, and applying the traction acting force to the test member below to enable the test member to move on a horizontal plane until the two test members are separated or the material friction abnormal sound test bed acquires friction abnormal sound. When the material friction abnormal sound test bed receives friction abnormal sound, the movement speed of the test member at the moment is recorded as a test relative speed, and the relative displacement of the test member at the moment is recorded as a test relative displacement. And changing the traction acting force, keeping the rest test parameters unchanged, and repeating the steps until all the characteristic values in the acting force range complete the test. In one test, a plurality of test relative speeds and test relative displacements are recorded, and a test relative speed array and a test relative displacement array are used as evaluation criteria.
The testing step and the simulation step may be performed simultaneously or sequentially, and in this embodiment, the testing step and the simulation step are performed simultaneously.
The analysis step specifically comprises the following steps:
the prediction result comprises the absence of abnormal sound risks, the presence of abnormal sound risks which do not form influences and the presence of larger abnormal sound risks. Sequentially comparing the simulation relative displacement array and the test relative displacement array of each simulation node pair, and generating a prediction result when the maximum value in the simulation relative displacement array is smaller than the minimum value in the test relative displacement array, wherein the generated prediction result indicates that the simulation node pair has no abnormal sound risk; and when the maximum value in the simulation relative displacement array is larger than or equal to the minimum value in the test relative displacement array, comparing the simulation relative speed array and the test relative speed array of the simulation node pair. When the maximum value of the simulation relative speed array of the simulation node pair is smaller than the minimum value of the test relative speed array, generating a prediction result, wherein the generated prediction result is that the simulation node pair has an abnormal sound risk which does not influence; and when the maximum value of the simulation relative speed array of the simulation node pair is greater than or equal to the minimum value of the test relative speed array, generating a prediction result, wherein the generated prediction result indicates that the simulation node pair has a large abnormal sound risk.
According to the prediction method of the embodiment, an adjacent structure is tested, 30 node pairs are arranged on the adjacent structure and are numbered respectively, a test relative displacement array and a test relative velocity array of a material pair corresponding to the adjacent structure are obtained according to test steps, and a simulation relative displacement array and a simulation relative velocity array of each node pair of a finite element model corresponding to the adjacent structure are obtained according to simulation steps. Taking the minimum value in the test relative displacement array as the test relative displacement, the minimum value in the test relative velocity array as the test relative velocity, the maximum value in the simulation relative displacement array as the simulation relative displacement of the simulation node pair, and the maximum value in the simulation relative velocity array as the simulation relative velocity of the simulation node pair, as shown in fig. 2 and fig. 3.
As can be seen from fig. 2, the simulated relative displacement of the node pair numbers 1009, 1015, and 1027 at the positions is greater than the test relative displacement, and as can be seen from fig. 3, the simulated relative velocity of the node pair number 1009 is less than the test relative velocity, so that the node pair number 1009 can be considered as having no risk of abnormal sound without any influence, i.e., the node pair can be considered as having no risk and no correlation processing is performed. And the simulated relative speed of the node pairs numbered 1015 and 1027 is greater than the test relative speed, so that a large abnormal sound risk inevitably exists, and the rest 27 node pairs do not have the abnormal sound risk.
Example two
The difference between the present embodiment and the first embodiment is: the position of the node is simulated. In this embodiment, the simulation nodes are located at the edges of the adjacent structures, and the simulation nodes in the same group are located at the edges of the adjacent structures, that is, the two simulation nodes in the same group are located at the edges of the two parts respectively.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. The automobile friction abnormal sound prediction method based on the relative displacement and the relative speed comprises a simulation step,
simulation: marking simulation node pairs on adjacent structures of the finite element model, applying road spectrum excitation to the finite element model for simulation, and acquiring simulation relative displacement of the simulation node pairs in the simulation process; the method is characterized in that: also comprises a test step and an analysis step,
the test steps are as follows: marking a test node pair on a material pair with the same adjacent structure, and acquiring test relative displacement and test relative speed of the test node pair as evaluation standards through a friction abnormal sound test;
the simulation step also comprises the steps of obtaining the simulation relative speed of the simulation node pairs in the simulation process, endowing the simulation node pairs with contact rigidity vertical to a motion plane before applying road spectrum excitation, and enabling the motion plane to be the same as the motion plane of an adjacent structure in the friction abnormal sound test;
and (3) an analysis step: and generating a prediction result by comparing the simulated relative displacement with the experimental relative displacement and comparing the simulated relative velocity with the experimental relative velocity.
2. The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as claimed in claim 1, wherein: the prediction result comprises the absence of abnormal sound risks, the presence of abnormal sound risks which do not form influences and the presence of larger abnormal sound risks, and the analysis step comprises the following steps:
comparing the simulated relative displacement with the test relative displacement in sequence, generating a prediction result without abnormal sound risk when the maximum value of the simulated relative displacement is smaller than the minimum value of the test relative displacement, and comparing the simulated relative speed with the test relative speed when the maximum value of the simulated relative displacement is not smaller than the minimum value of the test relative displacement; when the maximum value of the simulated relative speed is smaller than the minimum value of the test relative speed, a prediction result with abnormal sound risk which does not form influence is generated, and when the maximum value of the simulated relative speed is not smaller than the minimum value of the test relative speed, a prediction result with larger abnormal sound risk is generated.
3. The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as claimed in claim 1, wherein: each group of simulation node pairs comprises two simulation nodes, and the simulation nodes in the same group are all positioned at the edge of an adjacent structure.
4. The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as claimed in claim 1, wherein: each group of simulation node pairs comprises two simulation nodes, the adjacent structures are two parts with contact relations, and the simulation nodes in the same group are respectively positioned on the contact surfaces of the two parts.
5. The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as claimed in claim 4, wherein: the positions of the simulation nodes in the same group are in one-to-one correspondence.
6. The method for predicting automobile abnormal frictional sound based on the relative displacement and the relative speed according to any one of claims 3 to 5, wherein: the method for acquiring the simulation relative displacement of the simulation node pair in the simulation process in the simulation step comprises the following steps:
and (3) setting a coordinate system for each simulation node, and calculating the simulation relative displacement of the simulation node pair according to the coordinate values of the same set of simulation nodes.
7. The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as claimed in claim 1, wherein: and in the simulation step, when the simulation relative speed of the simulation node pair in the simulation process is obtained, the direction of the simulation relative speed is the direction of the simulation relative displacement of the simulation node pair.
8. The method for predicting the automobile friction abnormal sound based on the relative displacement and the relative speed as claimed in claim 1, wherein: the contact rigidity is more than 500N/mm.
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