CN116738563A - Method for analyzing rigidity of mounting point of chassis on side of auxiliary frame - Google Patents

Method for analyzing rigidity of mounting point of chassis on side of auxiliary frame Download PDF

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Publication number
CN116738563A
CN116738563A CN202310054284.1A CN202310054284A CN116738563A CN 116738563 A CN116738563 A CN 116738563A CN 202310054284 A CN202310054284 A CN 202310054284A CN 116738563 A CN116738563 A CN 116738563A
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mounting point
rigidity
auxiliary frame
chassis
vehicle body
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张政
蒋兵
刘文慧
李峰
刁杰胜
绪海涛
谈祥玲
陈光胜
杨添雄
马聪
王伟
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Chery Automobile Co Ltd
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Chery Commercial Vehicle Anhui Co Ltd
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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
    • 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]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/04—Constraint-based CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • 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

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  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Evolutionary Computation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The invention discloses a method for analyzing the rigidity of a chassis mounting point on a side of a subframe, which is characterized in that the rigidity of the chassis mounting point on the side of the subframe is simulated by taking the rigidity of the mounting point of a vehicle body, the influence of the rigidity of a connecting bushing and the rigidity of a subframe on the rigidity of the chassis mounting point into consideration, the rigidity of the mounting point of the vehicle body and the rigidity of the bushing are simulated in a serial connection mode of Bush units, a rigidity analysis model of the chassis mounting point on the side of the subframe is created, the influence of the rigidity of the subframe is eliminated through a calculation formula, and finally the rigidity of the chassis mounting point is obtained. The method ensures that the rigidity analysis of the chassis mounting point at the side of the auxiliary frame is performed normally and efficiently, shortens the development period of a new vehicle type, and improves the reliability of analysis results.

Description

Method for analyzing rigidity of mounting point of chassis on side of auxiliary frame
Technical Field
The invention belongs to the technical field of automobile design and manufacture, and particularly relates to a method for analyzing rigidity of a mounting point of a chassis at a side of a subframe.
Background
Automotive chassis is one of the most important systems in automotive construction. With the development of automobiles, today's automobiles are not just a basic travel vehicle, but are accompanied by more and more functions and experiences. Handling stability is one of these, and is now a very interesting and easily perceived performance for automotive consumers. The rigidity of the mounting points of all chassis parts on the auxiliary frame also directly influences the control stability of the whole vehicle.
In carrying out the invention, the inventors have found that the prior art has at least the following problems:
at present, for rigidity analysis of chassis mounting points on the side of a subframe, a subframe finite element model, namely a sheet metal part of the subframe, is generally adopted. According to the requirements of simulation flow guidelines and specifications, when the rigidity analysis of the mounting point of the chassis at the side of the auxiliary frame is carried out, the constraint mode of the model is defined firstly, then the load force in the investigation direction is loaded at the investigation mounting point, the deformation of the investigation mounting point is obtained through analysis, and then the rigidity at the investigation mounting point is obtained through calculation. And as for the constraint mode of the model, the processing differences can cause great differences in the final analysis result, so that the judgment of the final result and the operation stability performance teaching of the whole sample car are affected.
The main analysis method at present comprises the steps of (1) restraining a connection point of a subframe and a vehicle body, and applying a load to a chassis mounting point on the subframe for analysis to obtain mounting point rigidity; the disadvantage of this method of analysis is that the subframe is too rigid at the vehicle body connection point and the analysis results are too conservative. (2) And (3) directly applying load at the chassis mounting point on the auxiliary frame by adopting an inertial release method for analysis, and obtaining the rigidity of the mounting point. This analysis method is more commonly used by automotive host factories than the first method. However, the analysis method has the defects that the position of the constraint point is automatically calculated by finite element analysis software, the position of the constraint point is uncertain, and the position of the constraint point is possibly close to a rigidity analysis investigation point, so that the rigidity analysis result of the chassis mounting point is inaccurate.
CN104573174 a-a CAE-based vehicle body stiffness analysis method, comprising: establishing a vehicle body finite element grid model and a coordinate system, performing simulation test by applying loading and constraint to obtain a processing result, generating a curve, judging whether the processing result meets the requirement, and if so, storing the processing result, otherwise, reestablishing the vehicle body finite element grid model to perform the simulation test again, wherein the technical problem cannot be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an analysis method for the rigidity of a mounting point of a chassis at the side of a sub-frame, wherein the rigidity of the mounting point of the sub-frame and the rigidity of the mounting point of the sub-frame of a rigid body are respectively calculated by simulating the connection of the vehicle body and the sub-frame in a Bush unit series connection mode by considering the rigidity of the vehicle body and the rigidity of a connecting bushing in an analysis model, and then the rigidity of the mounting point of the chassis is calculated by a formula. The influence of the rigidity of the vehicle body and the rigidity of the bushing is considered, so that the rigidity of the mounting point of the chassis at the side of the auxiliary frame can be calculated more truly, and more reliable input is provided for the development and the teaching of the stability performance of the whole vehicle.
In order to solve the technical problems, the invention adopts the following technical scheme: a method of sub-frame side chassis mounting point stiffness analysis comprising the steps of:
1) Building a white body finite element model;
2) By adopting an inertia release method, load force of mounting point rigidity analysis is applied to the mounting point of the auxiliary frame on the white body side, and static rigidity K of the mounting point X, Y, Z in three directions is calculated body ；
3) If the white car body is connected with the auxiliary frame through a bushing, measuring the rigidity values of the bushing in six directions through a test; if the white car body and the auxiliary frame are rigidly connected by bolts, omitting the step;
4) Simulating connection of a vehicle body and an auxiliary frame in a serial connection mode of the Bush units, building a rigidity analysis model of an auxiliary frame side chassis mounting point, restraining all degrees of freedom of the Bush end of the vehicle body, namely one, two, three, four, five and six, and applying load force of a rigidity analysis working condition on the auxiliary frame side chassis mounting point;
5) Solving and calculating to obtain the chassis mounting point rigidity K of the flexible body auxiliary frame total ；
6) Amplifying the elastic modulus of the auxiliary frame material by 1000 times in the auxiliary frame side chassis mounting point rigidity analysis model constructed in the step 4), wherein the simulated auxiliary frame is a rigid body, and the steps of restraining and loading are the same as the step 4);
7) Solving and calculating to obtain the rigidity K of the chassis mounting point on the side of the auxiliary frame of the rigid body rigid ；
8) The flexible body subframe side chassis mounting point rigidity K obtained by the step 5) total And the rigidity K of the mounting point of the chassis on the side of the auxiliary frame of the rigid body obtained in the step 7) rigid The rigidity K of the chassis mounting point is calculated through a formula subf 。
The body-in-white finite element model in the step 1) comprises a body framework, front and rear bumpers, a front windshield glass assembly and a rear triangular window glass assembly.
The subframe mounting points in step 2) include a front subframe mounting point and a rear subframe mounting point.
In the step 3), the stiffness values of the bush in 6 directions can be obtained through bench test of a laboratory, and the stiffness values in 6 directions are Tx, ty, tz, mx, my and Mz respectively.
In the step 4), if the vehicle body and the auxiliary frame are connected through bushings, a mode of connecting the bus units in series is adopted, namely, two bus units are adopted to respectively simulate the vehicle body and the bushings for connecting the vehicle body and the auxiliary frame; the rigidity of the mounting point of the vehicle body is endowed to a Bush unit simulating the vehicle body; and (5) giving the bushing stiffness value obtained by the bench test to a Bush unit simulating the bushing.
In the step 4), if the vehicle body and the auxiliary frame are rigidly connected through bolts, 1 Bush unit and the vehicle body are adopted, and the rigidity of the mounting point of the vehicle body is given to the Bush unit simulating the vehicle body.
In the step 4), the chassis mounting point comprises an upper control arm mounting point, a stabilizer bar mounting point, a lower control arm mounting point, a trailing arm mounting point and a toe-in angle rear pull rod mounting point.
In the step 4), the load force value loaded by the rigidity analysis of the mounting point is 100N.
In the step 5), the rigidity value K of the mounting point of the auxiliary frame of the flexible body is calculated total The method comprises the steps of carrying out a first treatment on the surface of the In the step 6), the auxiliary frame is rigidized, namely, the elastic modulus in the material parameters of the auxiliary frame is improved by 1000 times; in the step 7), the rigidity value K of the mounting point of the auxiliary frame of the flexible body is calculated rigid 。
In the step 8, the calculation formula is as follows:
one of the above technical solutions has the following advantages or beneficial effects,
1. according to the invention, the bus units are adopted to simulate the vehicle body, the vehicle body and the auxiliary frame are provided with the bushings, the influence of the rigidity of the vehicle body and the rigidity of the bushings for connecting the auxiliary frame and the vehicle body on the rigidity of the chassis mounting point is considered, the rigidity of the chassis mounting point can be reflected more truly, and the development and the adjustment of the stability performance of the whole vehicle in the later period are facilitated.
2. The invention aims to eliminate the influence of the rigidity of the auxiliary frame on the rigidity of the chassis mounting point by respectively calculating the rigidity of the chassis mounting point of the flexible auxiliary frame and the rigidity of the chassis mounting point of the rigid auxiliary frame. And the final chassis mounting point rigidity is calculated through a formula, so that the final chassis mounting point rigidity is closer to the actual state of the whole vehicle. The method is favorable for the development team of the operation stability performance to better know and understand the whole vehicle state in the digital sample vehicle stage, lays a better foundation for the later sample vehicle operation stability performance regulating teaching, prevents the problem of insufficient rigidity of mounting points in the over-design or design stage, and increases the difficulty of later operation stability regulating teaching work.
In summary, the influence of the rigidity of the mounting point of the vehicle body and the rigidity of the auxiliary frame on the rigidity of the mounting point of the chassis is considered, the rigidity of the mounting point of the vehicle body and the rigidity of the Bush are simulated in a Bush unit series connection mode, an auxiliary frame side chassis mounting point rigidity analysis model is created, the influence of the rigidity of the auxiliary frame is eliminated through a calculation formula, and finally the rigidity of the chassis mounting point is obtained. The method ensures that the rigidity analysis of the chassis mounting point at the side of the auxiliary frame is performed normally and efficiently, shortens the development period of a new vehicle type, and improves the reliability of analysis results.
Drawings
FIG. 1 is a flow chart of a method and system for sub-frame side chassis mounting point stiffness analysis of the present invention;
FIG. 2 is a schematic illustration of the position of the body-in-white model and sub-frame mounting point stiffness analysis of the present invention;
FIG. 3 is a schematic view of a sub-frame side chassis mounting point stiffness analysis model
FIG. 4 is a schematic diagram of a simulation of a vehicle body and a bushing
The labels in the above figures are: 1. a front subframe left rear mounting point; 2. a front subframe left front mounting point; 3, a right front mounting point of the front auxiliary frame; 4. a front subframe right rear mounting point; 5. a body-in-white model; 6. a right front mounting point of the rear auxiliary frame; 7. a rear subframe right rear mounting point; 8. a rear subframe left rear mounting point; 9. a left front mounting point of the rear auxiliary frame; 10. chassis-upper control arm mounting points; 11. chassis-toe-angle rear tie-rod mounting points; 12. chassis-lower control arm mounting points; 13. a rear subframe; 14. mounting points of the auxiliary frame and the vehicle body; 15. mounting points of the auxiliary frame and the bushing; 16. bush 1-simulating the rigidity of a vehicle body; 17. bush 2-simulates bushing stiffness.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, a subframe side chassis mounting point stiffness analysis method and system.
The method comprises the following steps:
step 1: a body in white model 5 is built.
The body-in-white model 5 mainly comprises a body framework, a front bumper assembly, a rear bumper assembly, a front windshield assembly, a rear triangular window glass, a rear windshield assembly, a headlight beam assembly, a front end module assembly and the like. The body-in-white model 5 should also include information such as the thickness attribute of the sheet metal, the material attribute of the parts, the connection mode, etc.
Step 2: calculating the rigidity of the mounting point of the auxiliary frame (vehicle body side) by adopting an inertia release method
For the rigidity calculation of the auxiliary frame mounting point on the white body side, an inertia release method is adopted, at the front auxiliary frame left rear mounting point 1, the front auxiliary frame left front mounting point 2, the front auxiliary frame right front mounting point 3, the front auxiliary frame right rear mounting point 4, the rear auxiliary frame right front mounting point 6, the rear auxiliary frame right rear mounting point 7, the rear auxiliary frame left rear mounting point 8 and the rear auxiliary frame left front mounting point 9 are respectively loaded with a load force F of 100N, and the rigidity analysis of each mounting point creates an analysis working condition. And solving and calculating to obtain the displacement D of each mounting point in the loading force direction, and calculating to obtain the rigidity value of each mounting point through a formula K=F/D.
Step 3: and obtaining the rigidity value of the bushing at the mounting point of the vehicle body and the auxiliary frame through a bench test.
For the rigidity of the bushing, a group of samples (3 samples are recommended) are selected through laboratory bench tests, each sample is subjected to 3 rigidity tests, then effective rigidity test values of all the samples are selected for averaging, and the rigidity value of the bushing is obtained.
The bushing stiffness values include the Tx, ty, tz and Mx, my, mz 6 directions.
Step 4: the connection of the vehicle body and the auxiliary frame is simulated in a serial connection mode of the Bush units, and a rigidity analysis model of the chassis mounting point at the side of the auxiliary frame is built.
1) And (5) constructing a sub-frame side chassis mounting point rigidity analysis model.
Analysis as shown in fig. 4, two bus units 16 and 17 are created in finite element software, the two bus units 16 and 17 are connected in series, the stiffness value of the mounting point obtained by analysis in the step 2 is given to the property of the bus unit 17, and the stiffness value of the bushing obtained by bench test in the step 3 is given to the property of the bus unit 16.
The auxiliary frame side chassis mounting point rigidity analysis model also comprises material thickness information of auxiliary frame sheet metal, material information, welding lines, welding spots and other connection information.
2) Applying chassis mounting point stiffness analysis conditions
One end of the dash unit 17 is constrained, and the subframe-to-body joint 14 has all degrees of freedom DOF123456.
A load force F of 100N is applied at the bushing-to-body connection point 15.
Step 5: solving and calculating to obtain the chassis mounting point rigidity Ktotal of the flexible body auxiliary frame
And solving and calculating the flexible body subframe model 13 after the analysis working condition is created by utilizing finite element analysis software to obtain the deformation D at each loading point.
The stiffness value Ktotal of each chassis mounting point of the flexible body subframe is calculated by the formula k=f/D.
Step 6: the auxiliary frame is rigidized in a mode of amplifying the elastic modulus of the auxiliary frame material, and the analysis model is unchanged.
1) And (5) constructing a rigidity analysis model of the chassis mounting point at the side of the rigid auxiliary frame.
And (3) adopting the sub-frame side chassis mounting point rigidity analysis model constructed in the step (4). The elastic modulus of the sheet metal part of the auxiliary frame is increased by 1000 times, and the purpose is to rigidize the auxiliary frame and eliminate the influence of the structural rigidity of the auxiliary frame on the rigidity of the mounting point of the chassis.
2) Applying chassis mounting point stiffness analysis conditions
Keeping with step 4.
Step 7: solving and calculating to obtain the chassis mounting point rigidity Krigid of the rigid body auxiliary frame
And solving and calculating the rigid body auxiliary frame model 13 after the analysis working condition is created by utilizing finite element analysis software to obtain the deformation D at each loading point.
The stiffness value Krigid of each chassis mounting point of the flexible body subframe is calculated by the formula k=f/D.
Step 8: the rigidity Ksubf of the chassis mounting point at the side of the auxiliary frame is calculated by a formula
The chassis-mounting-point rigidity Ksubf is calculated by substituting the two rigidity values into the following formula by the flexible-body sub-frame-side chassis-mounting-point rigidity Ktotal obtained in step 5 and the rigid-body sub-frame-side chassis-mounting-point rigidity Krigid obtained in step 7.
The calculation formula is that
And comparing the calculated Ksubsurf with a performance target value according to the rigidity Ksubsurf of the chassis mounting point, and providing a basis and a reference basis for subsequent operation stability performance analysis and teaching.
In summary, the rigidity of the mounting point of the chassis is simulated by taking the rigidity of the mounting point of the vehicle body into consideration, the influence of the rigidity of the connecting Bush and the rigidity of the auxiliary frame on the rigidity of the mounting point of the chassis, and the rigidity of the mounting point of the chassis is finally obtained by adopting a Bush unit series connection mode to simulate the rigidity of the mounting point of the vehicle body and the rigidity of the Bush, creating a chassis mounting point rigidity analysis model on the side of the auxiliary frame and eliminating the influence of the rigidity of the auxiliary frame through a calculation formula. The method ensures that the rigidity analysis of the chassis mounting point at the side of the auxiliary frame is performed normally and efficiently, shortens the development period of a new vehicle type, and improves the reliability of analysis results.
The beneficial effects of the invention are as follows:
1. according to the invention, the bus units are adopted to simulate the vehicle body, the vehicle body and the auxiliary frame are provided with the bushings, the influence of the rigidity of the vehicle body and the rigidity of the bushings for connecting the auxiliary frame and the vehicle body on the rigidity of the chassis mounting point is considered, the rigidity of the chassis mounting point can be reflected more truly, and the development and the adjustment of the stability performance of the whole vehicle in the later period are facilitated.
2. The invention aims to eliminate the influence of the rigidity of the auxiliary frame on the rigidity of the chassis mounting point by respectively calculating the rigidity of the chassis mounting point of the flexible auxiliary frame and the rigidity of the chassis mounting point of the rigid auxiliary frame. And the final chassis mounting point rigidity is calculated through a formula, so that the final chassis mounting point rigidity is closer to the actual state of the whole vehicle. The method is favorable for the development team of the operation stability performance to better know and understand the whole vehicle state in the digital sample vehicle stage, lays a better foundation for the later sample vehicle operation stability performance regulating teaching, prevents the problem of insufficient rigidity of mounting points in the over-design or design stage, and increases the difficulty of later operation stability regulating teaching work.
In the description of the present invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A method of analyzing the stiffness of a sub-frame-side chassis mounting point, comprising the steps of:
1) Building a white body finite element model;
2) By adopting an inertia release method, load force of mounting point rigidity analysis is applied to the mounting point of the auxiliary frame on the white body side, and static rigidity K of the mounting point X, Y, Z in three directions is calculated body ；
3) If the white car body is connected with the auxiliary frame through a bushing, measuring the rigidity values of the bushing in six directions through a test; if the white car body and the auxiliary frame are rigidly connected by bolts, omitting the step;
4) Simulating connection of a vehicle body and an auxiliary frame in a serial connection mode of the Bush units, building a rigidity analysis model of an auxiliary frame side chassis mounting point, restraining all degrees of freedom of the Bush end of the vehicle body, namely one, two, three, four, five and six, and applying load force of a rigidity analysis working condition on the auxiliary frame side chassis mounting point;
5) Solving and calculating to obtain the chassis mounting point rigidity K of the flexible body auxiliary frame total ；
6) Amplifying the elastic modulus of the auxiliary frame material by 1000 times in the auxiliary frame side chassis mounting point rigidity analysis model constructed in the step 4), wherein the simulated auxiliary frame is a rigid body, and the steps of restraining and loading are the same as the step 4);
7) Solving and calculating to obtain the rigidity K of the chassis mounting point on the side of the auxiliary frame of the rigid body rigid ；
8) The flexible body subframe side chassis mounting point rigidity K obtained by the step 5) total And the rigid body subframe side chassis arrangement obtained in step 7)Rigidity of mounting point K rigid The rigidity K of the chassis mounting point is calculated through a formula subf 。
2. The method for analyzing the rigidity of the chassis-mounting point on the side of the subframe according to claim 1, wherein the body-in-white finite element model in the step 1) includes a body frame, front and rear bumpers, a front windshield assembly, and a rear triangular window assembly.
3. The method for analyzing rigidity of a sub-frame-side chassis mounting point according to claim 1, wherein said sub-frame mounting point in step 2) includes a front sub-frame mounting point and a rear sub-frame mounting point.
4. The method for analyzing the rigidity of the chassis mounting point on the side of the subframe according to claim 1, wherein in said step 3), the rigidity values of the bushings in 6 directions are obtained by bench test in a laboratory, and the rigidity values in 6 directions are Tx, ty, tz and Mx, my, mz, respectively.
5. The method for analyzing the rigidity of the chassis mounting point on the side of the auxiliary frame according to claim 1, wherein in the step 4), if the vehicle body and the auxiliary frame are connected by using bushings, the bushing units are connected in series, that is, two bushing units are used to simulate the vehicle body and the bushing for connecting the vehicle body and the auxiliary frame respectively; the rigidity of the mounting point of the vehicle body is endowed to a Bush unit simulating the vehicle body; and (5) giving the bushing stiffness value obtained by the bench test to a Bush unit simulating the bushing.
6. The method for analyzing the rigidity of a chassis-on-subframe-side chassis mounting point according to claim 1, wherein in said step 4), if the vehicle body and the subframe are rigidly connected by bolts, 1 bus unit and the vehicle body are used, and the rigidity of the vehicle body mounting point is given to the bus unit simulating the vehicle body.
7. The subframe-side chassis mounting point rigidity analysis method according to claim 1, wherein in the step 4), the chassis mounting point includes an upper control arm mounting point, a stabilizer bar mounting point, a lower control arm mounting point, a trailing arm mounting point, a toe-in-angle trailing arm mounting point.
8. The sub frame side chassis mounting point rigidity analysis method according to claim 1, wherein in said step 4), the mounting point rigidity analysis loads a load force value of 100N.
9. The method for analyzing the rigidity of the mounting point of the sub-frame side chassis according to claim 1, wherein in said step 5), a rigidity value K at the mounting point of the sub-frame of the flexible body is calculated total The method comprises the steps of carrying out a first treatment on the surface of the In the step 6), the auxiliary frame is rigidized, namely, the elastic modulus in the material parameters of the auxiliary frame is improved by 1000 times; in the step 7), the rigidity value K of the mounting point of the auxiliary frame of the flexible body is calculated rigid 。
10. The subframe-side chassis mounting point rigidity analysis method according to claim 1, wherein in the step 8, a calculation formula is:
CN202310054284.1A 2023-02-03 2023-02-03 Method for analyzing rigidity of mounting point of chassis on side of auxiliary frame Pending CN116738563A (en)

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Application Number Priority Date Filing Date Title
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