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Method for building integrated vehicle and ground coupled dynamical model

A dynamic model, an integrated technology, applied in the field of establishing an integrated dynamic model coupled with the vehicle and the ground, can solve problems such as the inability to be handled uniformly

Inactive Publication Date: 2013-10-23
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem that the present invention needs to solve is: all commercial multibody dynamics softwares can't carry out integrated coupling with continuum ground mechanics model at present, they usually need two independent calculation procedures to solve the coupling problem of vehicle and ground, so these Commercial multi-body dynamics software can only exchange state variables and force information between two softwares, but cannot uniformly handle algebraic constraint equations that must meet the requirements of position, velocity, and acceleration in multi-body dynamics algorithms, so it is impossible to truly solve Dynamic coupling problem between vehicle and ground

Method used

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  • Method for building integrated vehicle and ground coupled dynamical model
  • Method for building integrated vehicle and ground coupled dynamical model

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with specific examples.

[0039] The purpose of the present invention is achieved like this:

[0040] 1. Establish an absolute node coordinate system

[0041] Absolute nodal coordinate elements do not use infinitely small rotations or finite rotations as nodal coordinates, but use absolute slopes and displacements at nodes as nodal coordinates. The position vector r of any point on unit j j Can be expressed as a global coordinate system XYZ into r j = S j (x j ,y j ,z j )e j (t), where x in the equation j ,y j , and z j is the spatial coordinate of the unit, S j is the shape function matrix, e j is the element node coordinate vector at time t. Node coordinate vector e jk The expression at node k is:

[0042] e jk = [ r jkT ( ...

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Abstract

The invention relates to a method for building an integrated vehicle and ground coupled dynamical model. According to the method, a many-body dynamic model of a vehicle and a finite element model of the ground are integrated in one model which covers the mechanical relationship between the vehicle and the ground mathematically on the one hand and represents the coupling relationship between the vehicle and the ground during the solving process on the other hand; the coordinates and total strain of the ground can be calculated out based on the mechanical relationship and the coupling relationship; then the elastic force vector Qs and the like of the ground can be calculated according to the mechanical property, yield equation, flowing criterion and deformation state of the ground; finally, a new calculation is performed after the elastic force vector is substituted in a formula VI, and the loop iteration is carried out to complete the counting process of all the deformation, motion and stress state of the vehicle and ground in the time domain. According to the method, the integrated coupling with a ground mechanical model of a non-individual body is realized, the dynamical coupling of the vehicle and ground is solved really, and the method is suitable for solving the problem of huge deformation of the ground, such as moulding deformation.

Description

technical field [0001] The invention relates to a method for establishing a vehicle-ground coupling integrated dynamic model, and belongs to the technical field of methods for establishing vehicle-ground coupling dynamic models. Background technique [0002] During the research and development of the vehicle, it is necessary to fully consider the coupling characteristics between the vehicle and different grounds, so that the vehicle can adapt to the characteristics of various grounds and reduce bumps and skids. [0003] The vehicle-ground coupling dynamic model is an important basis for analyzing and researching vehicle dynamic characteristics and comfort. [0004] At present, all commercial multi-body dynamics software cannot truly integrate with the continuum ground mechanics model, and can only simply use some empirical formulas or models in mechanics (such as BEKKER formulas or models) to calculate force and displacement. Moreover, none of these commercial multibody dyn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李光布施凤英
Owner SHANGHAI NORMAL UNIVERSITY
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