CN114357599A - Finished automobile abnormal sound simulation analysis method and system and computer readable storage medium - Google Patents
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Abstract
The invention provides a method, a system and a computer readable storage medium for simulating and analyzing abnormal sound of a whole vehicle, which are oriented to real road working conditions, and the method comprises the following steps: s1, acquiring an abnormal sound road spectrum of the vehicle body side of the whole vehicle; s2, building an abnormal sound simulation model; s3, creating a node pairing unit group; s4, loading an abnormal sound road spectrum; s5, analyzing the transient response of the operation mode; s6, extracting the relative displacement; s7, generating an evaluation index of the impact and friction abnormal sound; and S8, evaluating the risk of collision and friction abnormal sound. The method can be used for predicting the risks of the impact and the abnormal friction sound in the vehicle in the design stage of the whole vehicle, and the problem rectification in the real vehicle stage is reduced, so that the development process of the abnormal sound performance of the whole vehicle is accelerated, the complaint of the after-sale TGW abnormal sound is reduced, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of automobile abnormal sound simulation analysis, in particular to a whole automobile abnormal sound simulation method facing road conditions.
Background
Abnormal sound is a performance index which is easy to be perceived by automobile users, and is one of the concerns of various large automobile manufacturing enterprises and component enterprises. When an automobile runs on a road, relative motion of whole automobile component systems (such as an instrument panel, a door trim and the like) is generated due to road excitation, impact and friction can be generated between adjacent interior trim parts and interior trim parts, and between the interior trim parts and metal parts, a squeak sound generated by the friction can be called as friction abnormal sound, and a rattle sound generated by the impact and the like can be called as impact abnormal sound. Along with the transformation and upgrading of consumption, the development pace of the products of the vehicle and the enterprise is accelerated. The method for simulating the abnormal sound of the whole vehicle facing the working conditions is developed, the collision and friction risks of the whole vehicle are identified and optimized in the product design stage, and the method has important practical significance for reducing sample vehicle problems, correcting and reducing the abnormal sound complaints after sale.
Chinese patent document CN108009360A discloses a method and device for analyzing abnormal sound of an automobile, and belongs to the technical field of automobiles. The method comprises the following steps: the method comprises the steps of creating a target three-dimensional model of a part, determining a first target area and a second target area, determining a first reference line in the first target area, determining a second reference line in the second target area, selecting a plurality of collision node pairs in the first target area, selecting a plurality of friction node pairs in the second target area under the condition of vibration of a preset frequency, outputting the distance between two nodes in each collision node pair in the direction perpendicular to the first reference line, obtaining a collision relation graph changing along with time in a preset time period, outputting the distance between two nodes in each friction node pair in the direction parallel to the second reference line, determining the position where the abnormal collision sound easily occurs according to the friction relation graph changing along with time in the preset time period, and determining the position where the abnormal collision sound easily occurs. Secondly, the node position is strictly controlled for establishing the node pair, so that the establishing efficiency of the simulation model is influenced; and finally, judging the risks of impact and friction abnormal sound according to the times that the time domain relative displacement exceeds the threshold displacement, wherein the mode is easily influenced by the time step of the load to cause unstable analysis results.
Chinese patent publication No. CN110162919A discloses a method for calibrating the risk level of vehicle interior impact abnormal sound based on an extreme temperature field, which comprises the following steps: establishing abnormal sound node pairs at assembly gaps between every two sheet metal parts and every two interior parts in the established vehicle interior decoration FEA model; carrying out temperature treatment on the vehicle interior FEA model; and acquiring the dynamic results of the abnormal sound node pairs under different abnormal sound road spectrums, and automatically calibrating the abnormal sound risk level according to the dynamic results. In the scheme, although road spectrum excitation is adopted, an abnormal sound road spectrum loading mode is lacked; in addition, the impact abnormal sound risk evaluation adopts relative displacement and relative acceleration in a frequency domain, the time-course characteristic of the relative displacement cannot be embodied, and the statistical distribution characteristic of the actual part gap is not considered.
Chinese patent publication No. CN110188479A discloses a method for predicting a risk position of an automobile collision abnormal sound, which relates to the technical field of automobile abnormal sound simulation analysis, in particular to a method for predicting a risk position of an automobile collision abnormal sound, comprising the following steps: marking nodes in a region where the edge of an interior trim part and the edge of a sheet metal part are matched in a finite element analysis model of an automobile system and forming node pairs; analyzing the relative displacement between the node pair and the inner nodes by using a finite element analysis model of the automobile system under the excitation of a road spectrum, and judging whether the relative displacement between the node pair and the inner nodes is larger than a design gap or not; and calculating the relative speed between the node pair nodes with the relative displacement larger than the designed clearance, and if the relative speed is larger than the target speed, judging that the position of the node pair is an abnormal sound risk position. In the scheme, although road spectrum excitation is adopted, an abnormal sound road spectrum loading mode is lacked; in addition, the impact abnormal sound risk evaluation adopts relative displacement and relative speed in a frequency domain, the time-course characteristic of the relative displacement cannot be embodied, and the statistical distribution characteristic of the actual part gap is not considered.
Chinese patent publication No. CN110263414A discloses a method for predicting a frictional abnormal sound danger point of an automotive interior system, which comprises the following steps: establishing a target three-dimensional model; determining a target area and establishing a node pair in the target area, wherein the node pair mutually contacts two components; acquiring the maximum amplitude of the relative displacement of two nodes in a node pair under the vibration of a preset frequency; calculating the local stiffness value of each node pair along the relative displacement direction between the node pairs, and acquiring the minimum abnormal sound displacement measured in the experiment of the corresponding node pair according to the selected material; calibrating the minimum abnormal sound displacement measured in the experiment by using the numerical simulation local stiffness value; and judging whether abnormal sound friction occurs at the position of the node pair according to the maximum amplitude of the relative displacement and the minimum abnormal sound displacement. The scheme does not adopt road spectrum excitation; in addition, on the friction abnormal sound risk evaluation index, a single maximum amplitude is directly extracted from the time domain relative displacement to serve as the evaluation index, and the randomness of the relative displacement of the two parts in the actual road driving process cannot be considered.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a finished automobile abnormal sound simulation method, a finished automobile abnormal sound simulation system and a computer readable storage medium, so as to improve the identification accuracy of abnormal sound risk problems in the early stage of product development and the product optimization capability.
The basic technical scheme provided by the invention is as follows:
a whole vehicle abnormal sound simulation method is oriented to real road working conditions and comprises the following steps:
and S1, acquiring the abnormal sound road spectrum of the vehicle body side of the whole vehicle by adopting the time domain acceleration.
And S2, building an abnormal sound simulation model.
And S3, respectively creating node pairing unit groups according to the potential impact abnormal sound areas and the friction abnormal sound areas.
And S4, loading the abnormal sound road spectrum, wherein the loading directions are XYZ three translation directions.
And S5, performing modal transient response analysis.
S6, extracting the relative displacement between the two node pairs.
And S7, respectively carrying out statistical averaging on the multipoint peak values according to the two potential abnormal sound modes of impact and friction, and generating impact and friction abnormal sound evaluation indexes based on time domain relative displacement.
And S8, evaluating the risk of collision and friction abnormal sound.
Further, in step S1, a time domain acceleration is used when the road spectrum is acquired, and the corresponding positions are all located on the vehicle body side and include a chassis suspension spring mounting region, a damper mounting region, a rear suspension control arm mounting region, and front and rear subframe mounting regions.
In this scheme, the abnormal sound way register for easy reference can adopt the mode of real car collection to obtain.
Further, in step S2, the abnormal sound model is an interior body model formed by removing the chassis system and the powertrain from the vehicle, and the interior is a detailed finite element mesh, such as an instrument panel, a door trim, and the like.
Further, in step S3, node pairing unit groups are created for the potential impact abnormal noise zone and the friction abnormal noise zone, respectively, and the node pairing unit groups are composed of RBE3, CBUSH spring units, and a local coordinate system.
In the scheme, the node pairing unit group is respectively established according to a potential impact abnormal sound area and a friction abnormal sound area, and the node pairing unit group consists of RBE3, a CBUSH spring unit and a local coordinate system. The local coordinate system Z direction is the gap direction of the two parts, and the CBUSH spring unit and two nodes of the CBUSH spring unit are directly related to the local coordinate system. CBUSH plays yellow unit, its characterized in that: the spring stiffness value is directly and uniformly set in advance, and for a potential impact abnormal sound area, the CBUSH stiffness value is uniformly set to be zero; for the potential frictional abnormal noise zone, a CBUSH rigidity value which is large enough is set only in the Z direction of a local coordinate system so as to simulate the mutual contact action between two components.
Further, in step S4, the actual abnormal road condition may be accurately simulated by means of multipoint loading.
Further, in step S5, the time domain displacement of two nodes of the CBUSH spring unit is calculated, and the total output duration is consistent with the duration of the road spectrum.
Further, in step S6, the two potential abnormal sound modes are respectively extracted for relative displacement along the Z direction of the local coordinate system, and for the potential frictional abnormal sound mode, the relative displacement is extracted along the X direction and the Y direction of the local coordinate system to generate a relative motion track in the contact surface, and then the main direction is identified based on the motion track, and finally the relative displacement decomposition is performed along the main direction to form the main direction relative displacement.
Further, in step S7, abnormal sound evaluation indexes are generated based on time domain relative displacement according to two potential abnormal sound modes, for the potential impact abnormal sound modes, the Z-direction relative displacement peak values are sorted, a certain proportion (for example, 10% -40%) of the peak values sorted in the front are selected to be averaged, then the actual gap distribution curves of the two components are combined to generate the impact abnormal sound occurrence rate, for the potential friction abnormal sound modes, the peak-peak values are screened from the main direction relative displacement curve and sorted, and a certain proportion (10% -40%) of the peak values sorted in the front are selected to be averaged, namely, the main direction relative displacement peak-peak values are obtained.
In the scheme, the actual gap distribution curve of the two parts generally presents normal distribution characteristics and represents the gap distribution probability density of the actual sample, and on the specific parameters, a normal distribution hypothesis E (mu, sigma) with a nominal gap value as expected mu and 1/N of an upper deviation (or a lower deviation) as sigma is adopted. For the incidence rate of the abnormal impact sound of the two parts, the abnormal sound risk rate is described statistically, and when the gap between the two parts is smaller than the relative displacement between the parts, the risk of the abnormal impact sound exists, so that the probability that the gap between the sample parts is smaller than the relative displacement between the two parts is the incidence rate of the abnormal impact sound.
Further, in step S8, based on the abnormal sound evaluation index calculated by simulation, the impact abnormal sound occurrence rate is compared with the control target to determine whether there is a risk of abnormal sound due to impact in the two component adjacent areas, and the main direction relative displacement is compared with the material friction parameter to determine whether there is a risk of abnormal sound due to friction in the two component adjacent areas. And finally, carrying out design optimization and improvement.
The invention also provides a whole vehicle abnormal sound simulation analysis system, which comprises: the system comprises a memory, a processor and a computer program stored on the memory, wherein the computer program is configured to realize the steps of the finished automobile abnormal sound simulation analysis method in the technical scheme when the computer program is called by the processor.
The invention also provides a computer readable storage medium, which stores a computer program, wherein the computer program is configured to realize the steps of the finished automobile abnormal sound simulation analysis method in the technical scheme when the computer program is called by a processor.
The invention has the advantages that:
1. the invention adopts the abnormal sound road spectrum load as the simulation analysis load, and the load is carried out in all directions on the vehicle body side, thereby accurately simulating the working condition of the abnormal sound road of the whole vehicle.
2. The method is used for examining the impact and friction abnormal sound based on the time domain relative displacement, and is closer to the actual abnormal sound generation mechanism.
3. In the invention, on the extraction of the time domain relative displacement, the multipoint peak value is adopted for carrying out statistical averaging, and the statistical average is adapted to the randomness of the relative displacement of the components in the road driving process.
4. The invention creates the connecting unit group in the adjacent area of the two components for checking the relative displacement, adopts a uniform structure, switches the modes of impact and friction abnormal sound, and only needs to adjust the attribute of the spring unit to carry out uniform setting, thereby being beneficial to improving the efficiency of abnormal sound simulation analysis.
5. Based on the risks of collision and abnormal friction sound of the parts in the vehicle identified by the simulation method, the invention can find out weak points on product design and optimize and improve the weak points in product design by combining problem diagnosis.
Drawings
FIG. 1 is a flow chart of a whole vehicle abnormal sound simulation method facing road conditions in the embodiment of the invention;
FIG. 2 is a schematic diagram of the positions of corresponding measuring points of the road spectrum of the abnormal sound of the whole vehicle in the embodiment of the invention;
FIG. 3 is a diagram illustrating an abnormal sound simulation model according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating paired unit groups according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the loading of an abnormal sound road spectrum according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the Z-direction relative displacement generation and extraction in the embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating main direction relative displacement extraction according to an embodiment of the present invention;
fig. 8 is a schematic diagram of generation of an impact abnormal sound occurrence rate in the embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
as shown in fig. 1, a whole vehicle abnormal sound simulation method is oriented to a real road condition, and is suitable for predicting a whole vehicle collision and abnormal friction sound risk position, in the embodiment, the method is explained by taking an instrument panel as an example, and the method includes the following steps:
s1: obtaining the abnormal sound road spectrum of the whole vehicle body side
The abnormal sound road spectrum of whole car body side can be obtained through real car test, lets the car go with the regulation speed of a motor vehicle on whole car abnormal sound road, adopts three-dimensional acceleration sensor test acceleration, and the test position that the car body side corresponds has: chassis suspension spring installing zone, shock absorber installing zone, rear suspension control arm installing zone, front and back sub vehicle frame installing zone see figure 2.
S2: building abnormal sound model
The abnormal sound model adopts an interior trim body model formed by removing a chassis system and a power assembly from a whole vehicle, and the interior trim is modeled by a detailed finite element grid, such as an instrument panel, and is shown in figure 3.
S3 creating a node pairing unit group
Creating a node pairing unit group at two component connection areas, such as: the potential abnormal sound mode corresponding to the adjacent area of the glove box and the instrument panel body is impact abnormal sound, the node pairing unit set is established according to the impact abnormal sound mode, the potential abnormal sound mode corresponding to the adjacent area of the combination instrument cover and the instrument panel body is friction abnormal sound, and the node pairing unit set is established according to the friction abnormal sound mode. Taking the glove box as an example, the connecting unit group is shown in fig. 4, and two nodes corresponding to the spring units are numbered 1001 and 2001.
The node pairing unit group consists of an RBE3, a CBUSH spring unit and a local coordinate system. The local coordinate system Z direction is the gap direction of the two parts, and the CBUSH spring unit and two nodes of the CBUSH spring unit are directly related to the local coordinate system.
The spring stiffness value of the CBUSH elastic yellow unit is directly and uniformly set in advance, and for a potential impact abnormal sound area, the CBUSH stiffness value is uniformly set to be zero; for the potential frictional abnormal noise zone, a CBUSH rigidity value which is large enough is set only in the Z direction of a local coordinate system so as to simulate the mutual contact action between two components.
S4: loading an abnormal sound road spectrum;
the loading directions are three XYZ translation directions, the loading positions are positioned on all the vehicle body sides and are consistent with the positions of the vehicle body sides corresponding to the abnormal sound road spectrums obtained in the step S1, and the loading duration is consistent with the testing duration. Taking the left front suspension spring mounting area as an example, the abnormal sound road spectrum loading is shown in fig. 5.
S5: analyzing the transient response of the operation mode;
and finishing modal transient response analysis by adopting Optistruct software, outputting the time domain displacement of the CBUSH spring unit nodes in all the node pairing unit groups in the adjacent region of the two parts, and completely consistent the total output time length and the road spectrum time length.
S6: extracting relative displacement;
relative displacement extraction is respectively carried out according to two potential abnormal sound modes, the potential abnormal sound mode corresponding to the adjacent area of the glove box and the instrument panel body is impact abnormal sound, the relative displacement is extracted along the Z direction of a local coordinate system, as shown in figure 6, under the given output duration,
the time domain relative displacement peak value corresponding to the adjacent area of the glove box and the instrument panel is 11 (P1-P11), the potential abnormal sound mode corresponding to the adjacent area of the combination instrument cover and the instrument panel body is friction abnormal sound, relative displacement is extracted along the X direction and the Y direction of a local coordinate system to generate a relative motion track in a contact surface, then a main direction is identified based on the relative motion track, and finally the relative displacement decomposition is carried out along the main direction to form main direction relative displacement, which is shown in figure 7.
S7: and generating an impact and friction abnormal sound evaluation index.
Generating abnormal sound evaluation indexes according to two potential abnormal sound modes respectively, for the impact abnormal sound, generating impact abnormal sound incidence, sequencing Z-direction relative displacement peak values, selecting a certain proportion of peak values which are sequenced in the front to average, and then generating the impact abnormal sound incidence by combining a normal distribution curve of an actual gap between two parts. On the normal distribution parameter, a normal distribution hypothesis E (μ, σ) where the nominal value of the gap is set to be desired μ and 1/N of the upper deviation (or the lower deviation) is set to be σ is assumed. Taking an adjacent area of the glove box and the instrument panel body as an example, 11 peak values (P1-P11) are appeared together, the selection proportion of the peak values is 40%, namely, the average value of 4 peak values in the front of the sequence is obtained, the average value of relative displacement is calculated to be 0.11mm through four peak values of P9(0.15mm), P11 (0.12 mm), P6 (0.09 mm) and P8 (0.08 mm), the corresponding design gap of the adjacent area of the glove box and the instrument panel body is 0.3mm, the upper deviation and the lower deviation are 0.3mm, N is 5, the sigma is calculated to be 0.06mm, the calculated impact abnormal sound incidence rate is 0.08%, and the graph is shown in FIG. 8. The incidence of the impact abnormal sound is the area corresponding to the shaded part in the figure.
For the friction abnormal sound, a main direction relative displacement peak-peak value needs to be generated, firstly, the peak-peak value is screened from a main direction relative displacement curve and sorted, and a certain proportion of peak values which are sorted in the front are selected to calculate an average value, namely the main direction relative displacement. Taking an adjacent area of the instrument cover and the instrument panel body as an example, in a corresponding time period, 9 peak-peak values (Q1-Q9) appear in the main direction relative displacement, the first 20% of the peak values are averaged, namely, the average value of the 2 peak values in the front sequence is obtained, and the average value of the main direction relative displacement is calculated to be 0.05mm by the two peak values of Q9(0.06mm) and Q2 (0.04 mm).
S8: and (4) evaluating the risks of impact and friction abnormal sound.
In the evaluation of the impact abnormal sound risk, the impact abnormal sound incidence rate is compared with a vehicle model development target, and the impact abnormal sound risk is judged, if the glove box is adjacent to the instrument panel body, the impact abnormal sound incidence rate is calculated in a simulation mode to be 0.08%, the project target is 10%, and the impact abnormal sound risk is acceptable; when the control target is exceeded, the product needs to be optimized and improved so as to reduce the risk of impact abnormal noise.
And in the friction abnormal sound risk evaluation, the main direction relative displacement is compared with the material auxiliary friction parameter, and the friction abnormal sound risk is judged. If the adjacent area of the combination instrument cover and the instrument panel body is formed, the mean value of the relative displacement in the main direction is calculated in a simulation mode to be 0.05mm, the friction parameter corresponding to the PC/PP-EPDM material pair of the two parts is [0.08,0.20] mm, the abnormal sound risk is acceptable because the relative displacement in the main direction is smaller than the lower limit of the friction parameter interval of the materials, when the relative displacement in the main direction is in the friction parameter interval of the materials, the risk needs to be reviewed again, and when the relative displacement in the main direction exceeds the upper limit of the friction parameter of the materials, the friction abnormal sound risk is extremely high, and the product needs to be optimized and improved to reduce the friction abnormal sound risk.
According to the embodiment, in the aspect of obtaining the abnormal sound road spectrum in the scheme, the abnormal sound road spectrum is obtained in a multi-point mode, and the abnormal sound road spectrum is loaded into the abnormal sound simulation model in a multi-point loading mode, so that the accuracy of road working condition simulation is ensured. The problems of impact and friction abnormal sound are examined based on time domain relative displacement, and the examination mode is closer to the actual abnormal sound generation mechanism; in the extraction of the time domain relative displacement, a multipoint peak value is adopted for statistical averaging, and the statistical average is adapted to the randomness of the relative displacement of the components in the road driving process.
The above embodiments are only examples of the present invention, and the general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art can understand that all or part of the processes of the methods of the above embodiments can be implemented. The present invention is not limited to the above embodiments, and any changes and modifications that can be easily made by those skilled in the art within the technical scope of the present invention can be covered by the present invention.
Claims (15)
1. A whole vehicle abnormal sound simulation analysis method is characterized in that an abnormal sound evaluation index is generated based on time domain relative displacement facing to a real road working condition and a component impact and friction abnormal sound position area: the method comprises the following steps:
s1, acquiring an abnormal sound road spectrum of the vehicle body side of the whole vehicle by adopting time domain acceleration;
s2, building an abnormal sound simulation model;
s3, respectively creating node pairing unit groups according to the potential impact abnormal sound zone and the friction abnormal sound zone;
s4, loading an abnormal sound road spectrum, wherein the loading directions are XYZ three translation directions;
s5, analyzing the transient response of the operation mode;
s6, extracting the relative displacement between two node pairs;
s7, respectively carrying out statistical averaging on the multipoint peak values according to the two potential abnormal sound modes of impact and friction, and generating impact and friction abnormal sound evaluation indexes based on time domain relative displacement;
and S8, evaluating the risk of collision and friction abnormal sound.
2. The method for simulating and analyzing the abnormal sound of the whole vehicle according to claim 1, wherein in step S1, the position corresponding to the acquired road spectrum is located on the vehicle body side and comprises a chassis suspension spring mounting area, a shock absorber mounting area, a rear suspension control arm mounting area and front and rear subframe mounting areas.
3. The method for simulating and analyzing the abnormal sound of the whole vehicle as claimed in claim 1, wherein in step S2, the abnormal sound simulation model adopts an interior body model formed by removing the chassis system and the power assembly from the whole vehicle, and the door interior is completely a detailed finite element mesh.
4. The finished automobile abnormal sound simulation analysis method according to claim 1, wherein in step S3, the node pairing unit group is composed of an RBE3, a CBUSH spring unit and a local coordinate system.
5. The finished automobile abnormal sound simulation analysis method according to claim 4, characterized in that: the local coordinate system Z direction is the gap direction of the two parts, and the CBUSH spring unit and two nodes of the CBUSH spring unit are directly related to the local coordinate system.
6. The finished automobile abnormal sound simulation analysis method according to claim 4, characterized in that: the spring stiffness value of the CBUSH elastic yellow unit is directly and uniformly set in advance, and for a potential impact abnormal sound area, the CBUSH stiffness value is uniformly set to be zero; for the potential friction abnormal noise zone, the CBUSH rigidity value is set only in the Z direction of a local coordinate system so as to simulate the mutual contact action between two parts.
7. The finished automobile abnormal sound simulation analysis method of claim 1, characterized in that: in the step 4, the load duration is consistent with the test duration.
8. The finished automobile abnormal sound simulation analysis method of claim 1, characterized in that: in step S5, time domain displacement of two nodes of the CBUSH spring unit is calculated, and the total output duration is completely consistent with the duration of the road spectrum.
9. The finished automobile abnormal sound simulation analysis method of claim 1, characterized in that: in step S6, extracting relative displacements according to two potential abnormal sound modes of impact and friction, and extracting relative displacements along the Z direction of the local coordinate system for the potential impact abnormal sound modes; for the potential friction abnormal sound mode, relative displacement is extracted along the X direction and the Y direction of a local coordinate system, a relative motion track in a contact surface is generated, then a main direction is identified based on the relative motion track, and finally, relative displacement decomposition is carried out along the main direction to form main direction relative displacement.
10. The finished automobile abnormal sound simulation analysis method of claim 1, characterized in that: in step S7, for the potential impact abnormal sound mode, sorting Z-direction relative displacement peak values, selecting 10% -40% of the peak values in the front sorting for averaging, then combining the actual gap distribution curves of the two parts to generate the impact abnormal sound incidence rate, for the potential friction abnormal sound mode, screening peak-peak values from the main direction relative displacement curve and sorting, selecting 10% -40% of the peak values in the front sorting for averaging, namely the main direction relative displacement peak-peak values.
11. The finished automobile abnormal sound simulation analysis method according to claim 10, characterized in that: the actual gap distribution curve of the two parts represents the gap distribution probability density of an actual sample piece, and generally presents normal distribution characteristics, and the specific distribution is normal distribution E (mu, sigma) with a gap nominal value as expected mu and 1/N of upper deviation or lower deviation as sigma.
12. The finished automobile abnormal sound simulation analysis method according to claim 10, characterized in that: the incidence rate of the two parts striking abnormal sound is the probability that the gap of the sample piece is smaller than the relative displacement of the two parts.
13. The finished automobile abnormal sound simulation analysis method of claim 1, characterized in that: step S8 is to compare the impact abnormal sound occurrence rate with the control target based on the abnormal sound evaluation index calculated by simulation, and determine whether there is an impact abnormal sound risk in the adjacent region of the two components; and comparing the relative displacement in the main direction with the friction parameters of the material, and judging whether the adjacent areas of the two parts have the risk of abnormal friction sound.
14. The utility model provides a whole car abnormal sound simulation analysis system which characterized in that includes: a memory, a processor and a computer program stored on the memory, the computer program being configured to implement the steps of the whole vehicle abnormal sound simulation analysis method of any one of claims 1 to 13 when invoked by the processor.
15. A computer-readable storage medium characterized by: the computer-readable storage medium stores a computer program configured to implement the steps of the complete vehicle abnormal sound simulation analysis method according to any one of claims 1 to 13 when being invoked by a processor.
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