Method for building an integrated dynamic model of vehicle-ground coupling

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...

AI Technical Summary

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

Images