CN117494519A - NVH whole vehicle module digital modeling method and storage medium - Google Patents
NVH whole vehicle module digital modeling method and storage medium Download PDFInfo
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- CN117494519A CN117494519A CN202311507634.1A CN202311507634A CN117494519A CN 117494519 A CN117494519 A CN 117494519A CN 202311507634 A CN202311507634 A CN 202311507634A CN 117494519 A CN117494519 A CN 117494519A
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- 230000006870 function Effects 0.000 claims abstract description 98
- 238000004364 calculation method Methods 0.000 claims abstract description 43
- 238000004806 packaging method and process Methods 0.000 claims abstract description 21
- 238000004088 simulation Methods 0.000 claims abstract description 17
- 230000004044 response Effects 0.000 claims description 32
- 238000005538 encapsulation Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 4
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to a digital modeling method and a storage medium for an NVH whole vehicle module, wherein the method comprises the following steps: modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained; calculating the mode and transfer function of each subsystem; model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved; and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model. Because the newly built whole vehicle sensor model is composed of modules, the mode and transfer function information of the subsystem are packaged in the modules, the whole vehicle global matrix is not required to be built during calculation of the whole vehicle, and the mode or transfer function result of the modules is directly used for calculation, so that the calculation scale of the whole vehicle model is greatly reduced, the transfer function model of the whole vehicle does not need a large amount of memory and storage space required by a traditional whole vehicle finite element model, the required hardware resources are greatly reduced, the calculation time is obviously shortened, and a large amount of resources are saved.
Description
Technical Field
The application relates to the technical field of vehicle models, in particular to a digital modeling method for an NVH vehicle module and a storage medium.
Background
The whole vehicle performance development can go through a digital model stage, a sample debugging stage and a real vehicle verification stage, wherein the whole vehicle NVH performance development usually carries out simulation analysis on structural performance through a conventional CAE simulation means in the digital model stage, potential risks are found, optimization and improvement suggestions are provided, digital model locking is completed through simulation, and finally debugging and acceptance are carried out in the sample vehicle stage and the real vehicle stage.
The conventional NVH CAE simulation method is a finite element method at present, namely, a CAD model issued by the whole vehicle is subjected to grid division and grid assembly to form a complete whole vehicle finite element model, modal, rigidity and transfer function analysis are carried out on the model, or an excitation source is applied to carry out whole vehicle working condition analysis, so that the NVH performance of the whole vehicle structure can be accurately obtained through the finite element method.
However, the modeling time of the whole vehicle finite element model is long, the demand on computing hardware resources is large, and the computing time is long; when the scheme is optimized, the optimized scheme model needs to be updated into the whole vehicle finite element model after gridding treatment, the time consumption is long, meanwhile, after each scheme is treated, the whole vehicle finite element model is required to submit calculation, a large amount of time is required to be consumed again in the calculation process, the optimized scheme cannot be iterated rapidly, and the requirement of increasingly shortening the project development period cannot be met.
Disclosure of Invention
In view of the above problems, the application provides a digital modeling method and a storage medium for an NVH whole vehicle module, which solve the problems of long modeling time, large demand on computing hardware resources and long computing time consumption of the existing whole vehicle finite element model.
In order to achieve the above purpose, the inventor provides a digital modeling method for an NVH whole vehicle module, which comprises the following steps:
modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained;
calculating the mode and transfer function of each subsystem;
model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved;
and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model.
In some embodiments, the calculating the mode and transfer function of each subsystem specifically includes the following steps:
dividing the network of each subsystem according to the split state;
and setting each subsystem as a free boundary;
and carrying out modal calculation and transfer function calculation according to the preset calculation frequency.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems specifically includes the following steps:
the mode and transfer function of each subsystem calculated are reserved;
and acquiring a connection point and a response point of each subsystem, and carrying out model encapsulation on each subsystem.
In some embodiments, the assembling the packaged subsystem model to obtain the whole vehicle transfer function model specifically includes the following steps:
determining the connection relation among the subsystems according to the connection points and the response points among the subsystems;
and assembling all the subsystems according to the connection relation among all the subsystems to obtain the whole vehicle transfer function model.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems further includes the following steps:
and deleting the finite element grid units of each subsystem and node information except for the connection points and the response points.
There is also provided another technical solution, a storage medium storing a computer program which, when executed by a processor, performs the steps of:
modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained;
calculating the mode and transfer function of each subsystem;
model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved;
and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model.
In some embodiments, the calculating the mode and transfer function of each subsystem specifically includes the following steps:
dividing the network of each subsystem according to the split state;
and setting each subsystem as a free boundary;
and carrying out modal calculation and transfer function calculation according to the preset calculation frequency.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems specifically includes the following steps:
the mode and transfer function of each subsystem calculated are reserved;
and acquiring a connection point and a response point of each subsystem, and carrying out model encapsulation on each subsystem.
In some embodiments, the assembling the packaged subsystem model to obtain the whole vehicle transfer function model specifically includes the following steps:
determining the connection relation among the subsystems according to the connection points and the response points among the subsystems;
and assembling all the subsystems according to the connection relation among all the subsystems to obtain the whole vehicle transfer function model.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems further includes the following steps:
and deleting the finite element grid units of each subsystem and node information except for the connection points and the response points.
Compared with the prior art, the technical scheme is characterized in that the whole vehicle simulation model is modularized and grouped to obtain all subsystems, such as a rear suspension system, a front subframe assembly, a rear subframe assembly, a vehicle body, a steering system, a seat and the like, then the modes and transfer functions of all subsystems are calculated, then the subsystems are subjected to model encapsulation, the encapsulated subsystem model retains the mode and transfer function information, then the encapsulated subsystem is assembled to obtain the whole vehicle transfer function model, and because the newly built whole vehicle transfer function model consists of all modules, the modes and transfer function information of the subsystems are encapsulated in all the modules, the whole vehicle calculation is performed without building a whole vehicle global matrix, and the mode or transfer function results of all the modules are directly used for directly participating in calculation, so that the whole vehicle model calculation scale is greatly reduced, a large amount of memory and storage space required by the traditional whole vehicle finite element model are not required, the required hardware resources are greatly reduced, the calculation time is obviously shortened, and a large amount of resources are saved.
The foregoing summary is merely an overview of the present application, and is provided to enable one of ordinary skill in the art to make more clear the present application and to be practiced according to the teachings of the present application and to make more readily understood the above-described and other objects, features and advantages of the present application, as well as by reference to the following detailed description and accompanying drawings.
Drawings
The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of the present application and are not to be construed as limiting the application.
In the drawings of the specification:
FIG. 1 is a schematic flow chart of a method for digitally modeling an NVH whole vehicle module according to an embodiment;
FIG. 2 is a schematic structural diagram of a whole vehicle simulation model modularization according to an embodiment;
FIG. 3 is a schematic diagram comparing a whole vehicle finite element model with a whole vehicle transfer function model according to an embodiment;
fig. 4 is a schematic flow chart of step S120 in the embodiment;
fig. 5 is a schematic structural view of a storage medium according to an embodiment.
Reference numerals referred to in the above drawings are explained as follows:
510. the storage medium may be a storage medium,
520. a processor.
Detailed Description
In order to describe the possible application scenarios, technical principles, practical embodiments, and the like of the present application in detail, the following description is made with reference to the specific embodiments and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples and are not intended to limit the scope of protection of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.
Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains; the use of related terms herein is for the description of specific embodiments only and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a representation for describing a logical relationship between objects, which means that there may be three relationships, e.g., a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.
In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.
Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this application is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.
As in the understanding of the "examination guideline," the expressions "greater than", "less than", "exceeding", and the like are understood to exclude the present number in this application; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of groups", "a plurality of" and the like, unless specifically defined otherwise.
In the description of the embodiments of the present application, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as terms of orientation or positional relationship based on the specific embodiments or figures, and are merely for convenience of description of the specific embodiments of the present application or ease of understanding of the reader, and do not indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation, and therefore are not to be construed as limiting of the embodiments of the present application.
Unless specifically stated or limited otherwise, in the description of the embodiments of the present application, the terms "mounted," "connected," "affixed," "disposed," and the like are to be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains according to the specific circumstances.
Referring to fig. 1, the present embodiment provides a digital modeling method for an NVH whole vehicle module, including the following steps:
step S110: modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained;
step S120: calculating the mode and transfer function of each subsystem;
step S130: model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved; wherein, transfer function information and transfer function information.
Step S140: and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model.
The whole vehicle simulation model is modularized, as shown in fig. 2, the modularized grouping is carried out on the whole vehicle simulation model, so that subsystems such as a rear suspension system, a front subframe assembly, a rear subframe assembly, a vehicle body, a steering system, a seat and the like are obtained, then the modes and transfer functions of the subsystems are calculated, then the subsystems are subjected to model packaging, the packaged subsystem models retain mode and transfer function information, then the packaged subsystem is assembled to obtain the whole vehicle transfer function model, and because the newly built whole vehicle sensor model consists of modules, the mode and transfer function information of the subsystems are packaged in the modules, the whole vehicle calculation is carried out without building a whole vehicle global matrix, and the mode or transfer function result of the modules is directly used for directly participating in calculation, so that the whole vehicle model calculation scale is greatly reduced, and the whole vehicle transfer function model does not need a large amount of memory and storage space required by the traditional whole vehicle finite element model, meanwhile, the calculation time is also greatly shortened, and a large amount of resources are saved.
In some embodiments, the calculating the mode and transfer function of each subsystem specifically includes the following steps:
dividing the network of each subsystem according to the split state;
and setting each subsystem as a free boundary;
and carrying out modal calculation and transfer function calculation according to the preset calculation frequency.
The transfer function is used for responding to vibration and noise transfer characteristics of a structure from one point to another point on the structure, such as assembling body transfer function information, and comprises vibration transfer characteristics from a connection point of a chassis and a body to the ears of a driver and passengers and vibration transfer characteristics from a connection point of the chassis and the body to positions of a steering wheel and a seat beam.
Referring to fig. 4, in some embodiments, the model packaging of each subsystem, and reserving the mode and transfer function information of each subsystem specifically includes the following steps:
step S410: the mode and transfer function of each subsystem calculated are reserved;
step S420: and acquiring a connection point and a response point of each subsystem, and carrying out model encapsulation on each subsystem.
In the process of carrying out model encapsulation on each subsystem, the mode and transfer function information of the completion of calculation of each subsystem are reserved, the mode and transfer function information of each subsystem are directly utilized to directly participate in calculation when the model is used for whole vehicle calculation, meanwhile, or the connection point and the response point of each subsystem are set, the connection point comprises an input point and an output point, the response point comprises a whole vehicle vibration measuring point and an in-vehicle noise measuring point, and when a follow-up model is assembled, only the input point and the output point are used, and the connection is carried out through the input point and the output point and adjacent subsystems. Specifically, the method for assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model specifically comprises the following steps:
determining the connection relation among the subsystems according to the connection points and the response points among the subsystems;
and assembling all the subsystems according to the connection relation among all the subsystems to obtain the whole vehicle transfer function model.
The connection points are used for assembling adjacent subsystems through the connection points and the response points among the subsystems, the response points are investigation points used for subsequent simulation calculation after the model is assembled, so that the connection relation among the subsystems is determined, the assembly of the subsystems can be realized according to the connection relation among the subsystems, and the whole vehicle transfer function model is obtained. For example, the connection point of the subframe has a vehicle body fixing point, and if the motor mounting point is on the subframe, the connection point further comprises a motor suspension and subframe fixing point.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems further includes the following steps:
and deleting the finite element grid units of each subsystem and node information except for the connection points and the response points.
When each subsystem is packaged, only the mode and transfer function information of each subsystem is reserved, connection points and response points are reserved, other information, such as the finite element grid units of each subsystem and node information except the connection points and the response points, is deleted, and no other information is reserved.
When the NVH performance of the whole vehicle structure is optimized, only the subsystem is updated according to the part of the subsystem which is changed, the subsystem is used for calculating the mode or transfer function independently again after the update, and then the subsystem is replaced into the whole vehicle model again for calculating the whole vehicle.
In the scheme, the whole vehicle finite element model is subjected to modularized parameterization, the modal information of each module is stored along with the model, and when the whole vehicle is continuously assembled, each subsystem modal structure directly participates in calculation to obtain the whole vehicle modal and response result, and the whole vehicle grid unit is not required to participate in modal and response analysis. When the NVH performance optimization iteration is carried out, only an updated part is needed, other parts are kept unchanged, the whole vehicle model scale is greatly reduced, the calculation time is obviously shortened, the hardware resources required by calculation are few, and the hardware cost is reduced.
Referring to fig. 5, in another embodiment, a storage medium 510 stores a computer program, which when executed by a processor 520 performs the steps of:
modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained;
calculating the mode and transfer function of each subsystem;
model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved;
and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model.
The method comprises the steps of carrying out modularized grouping on the whole vehicle simulation model to obtain subsystems such as a rear suspension system, a front subframe assembly, a rear subframe assembly, a vehicle body, a steering system, a seat and the like, calculating the modes and transfer functions of the subsystems, carrying out model packaging on the subsystems, reserving mode and transfer function information on the packaged subsystem models, and assembling the packaged subsystems to obtain the whole vehicle transfer function model.
In some embodiments, the calculating the mode and transfer function of each subsystem specifically includes the following steps:
dividing the network of each subsystem according to the split state;
and setting each subsystem as a free boundary;
and carrying out modal calculation and transfer function calculation according to the preset calculation frequency.
The transfer function is used for responding to vibration and noise transfer characteristics from one point to another point on the structure, such as assembling body transfer function information, and comprises vibration transfer characteristics from the connection point of the chassis and the body to the driver and passenger beside ears and vibration transfer characteristics from the connection point of the chassis and the body to the positions of the steering wheel and the seat cross beam.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems specifically includes the following steps:
the mode and transfer function of each subsystem calculated are reserved;
and acquiring a connection point and a response point of each subsystem, and carrying out model encapsulation on each subsystem.
In the process of carrying out model encapsulation on each subsystem, the mode and transfer function information of the completion of calculation of each subsystem is reserved, the mode and transfer function information of each subsystem are directly utilized to directly participate in calculation when the model is used for whole vehicle calculation, meanwhile, or the connection point and the response point of each subsystem are used, when the subsequent model is assembled, only the input point and the output point are used, and the connection is carried out through the input point and the output point and the adjacent subsystem. Specifically, the method for assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model specifically comprises the following steps:
determining the connection relation among the subsystems according to the connection points and the response points among the subsystems;
and assembling all the subsystems according to the connection relation among all the subsystems to obtain the whole vehicle transfer function model.
And determining the connection relation among the subsystems through connection points and response points among the subsystems, so that the assembly of the subsystems can be realized according to the connection relation among the subsystems, and a whole vehicle transfer function model is obtained. For example, the connection point of the subframe has a vehicle body fixing point, and if the motor mounting point is on the subframe, the connection point further comprises a motor suspension and subframe fixing point.
In some embodiments, the model packaging the subsystems, and reserving the mode and transfer function information of the subsystems further includes the following steps:
and deleting the finite element grid units of each subsystem and node information except for the connection points and the response points.
When each subsystem is packaged, only the mode and transfer function information of each subsystem is reserved, connection points and response points are reserved, other information, such as the finite element grid units of each subsystem and node information except the connection points and the response points, is deleted, and no other information is reserved.
When the NVH performance of the whole vehicle structure is optimized, only the subsystem is updated according to the part of the subsystem which is changed, the subsystem is used for calculating the mode or transfer function independently again after the update, and then the subsystem is replaced into the whole vehicle model again for calculating the whole vehicle.
In the scheme, the whole vehicle finite element model is subjected to modularized parameterization, the modal information of each module is stored along with the model, and when the whole vehicle is continuously assembled, each subsystem modal structure directly participates in calculation to obtain the whole vehicle modal and response result, and the whole vehicle grid unit is not required to participate in modal and response analysis. When the NVH performance optimization iteration is carried out, only an updated part is needed, other parts are kept unchanged, the whole vehicle model scale is greatly reduced, the calculation time is obviously shortened, the hardware resources required by calculation are few, and the hardware cost is reduced.
Finally, it should be noted that, although the foregoing embodiments have been described in the text and the accompanying drawings of the present application, the scope of the patent protection of the present application is not limited thereby. All technical schemes generated by replacing or modifying equivalent structures or equivalent flows based on the essential idea of the application and by utilizing the contents recorded in the text and the drawings of the application, and the technical schemes of the embodiments are directly or indirectly implemented in other related technical fields, and the like, are included in the patent protection scope of the application.
Claims (10)
1. The digital modeling method for the NVH whole vehicle module is characterized by comprising the following steps of:
modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained;
calculating the mode and transfer function of each subsystem;
model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved;
and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model.
2. The method for digitally modeling an NVH whole vehicle module according to claim 1, wherein said calculating modes and transfer functions of each subsystem specifically comprises the steps of:
dividing the network of each subsystem according to the split state;
and setting each subsystem as a free boundary;
and carrying out modal calculation and transfer function calculation according to the preset calculation frequency.
3. The method for digitally modeling an NVH whole vehicle module according to claim 1, wherein the model packaging of each subsystem, and reserving the mode and transfer function information of each subsystem, specifically comprises the following steps:
the mode and transfer function of each subsystem calculated are reserved;
and acquiring a connection point and a response point of each subsystem, and carrying out model encapsulation on each subsystem.
4. The method for digitally modeling an NVH whole vehicle module according to claim 3, wherein the assembling of the encapsulated subsystem model to obtain the whole vehicle transfer function model specifically comprises the following steps:
determining the connection relation among the subsystems according to the connection points and the response points among the subsystems;
and assembling all the subsystems according to the connection relation among all the subsystems to obtain the whole vehicle transfer function model.
5. The method for digitally modeling an NVH whole vehicle module according to claim 3, wherein said model packaging each subsystem, and reserving the mode and transfer function information of each subsystem further comprises the steps of:
and deleting the finite element grid units of each subsystem and node information except for the connection points and the response points.
6. A storage medium storing a computer program, characterized in that the computer program when run by a processor performs the steps of:
modularized grouping is carried out on the whole vehicle simulation model, and each subsystem is obtained;
calculating the mode and transfer function of each subsystem;
model packaging is carried out on each subsystem, and the mode and transfer function information of each subsystem are reserved;
and assembling the encapsulated subsystem model to obtain the whole vehicle transfer function model.
7. The storage medium of claim 6, wherein the calculating of the mode and transfer function of each subsystem comprises the steps of:
dividing the network of each subsystem according to the split state;
and setting each subsystem as a free boundary;
and carrying out modal calculation and transfer function calculation according to the preset calculation frequency.
8. The storage medium of claim 6, wherein the model packaging the subsystems and reserving the modal and transfer function information of the subsystems specifically comprises the steps of:
the mode and transfer function of each subsystem calculated are reserved;
and acquiring a connection point and a response point of each subsystem, and carrying out model encapsulation on each subsystem.
9. The storage medium of claim 8, wherein the assembling the packaged subsystem model to obtain the whole vehicle transfer function model specifically comprises the following steps:
determining the connection relation among the subsystems according to the connection points and the response points among the subsystems;
and assembling all the subsystems according to the connection relation among all the subsystems to obtain the whole vehicle transfer function model.
10. The storage medium of claim 8, wherein the model packaging of each subsystem, retaining the modality and transfer information of each subsystem, further comprises the steps of:
and deleting the finite element grid units of each subsystem and node information except for the connection points and the response points.
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