A 1/4 vehicle model modeling method based on McPherson suspension

Abstract

The invention discloses a 1 / 4 automobile model modeling method based on McPherson suspension, comprising the following steps: 1) drawing a 1 / 4 automobile model plan based on McPherson suspension, andmaking related simplified assumptions and definitions; 2) defining a coordinate matrix of each coordinate point on that plan; 3) kinematics analysis of the system based on the geometrical relation inthe plane graph by using the displacement matrix method; 4) defining a force matrix of each coordinate point; 5) taking a certain instantaneous object in that motion of the system to carry out dynamicanalysis; 6) model linearization, i. E. Linearization of the equation at the equilibrium position of the system. As the suspension geometry structure, the moment of inertia of the control arm, the moment of inertia of the tire, the tire dam, the lateral rigidity of the tire and other factors are comprehensively consider, kinematics parameters such as the inclination angle of the kingpin, the camber angle of the tire, the change amount of the wheel tread and the like can be analyzed, the precision is high, the practicability is stronger, and a reliable basis can be provided for the design andperformance analysis of the suspension.

Description

technical field [0001] The invention belongs to the field of automobile model modeling, in particular to a 1 / 4 automobile model modeling method based on MacPherson suspension. Background technique [0002] Suspension system is an important part of a car, and its performance is an important factor affecting the ride comfort and handling stability of a car. Because the McPherson suspension has the advantages of simple structure, less space occupation, and favorable layout of the engine compartment, it is widely used in the front suspension of many models. At present, the models used for vehicle ride comfort analysis mainly include: 7-DOF model based on vehicle ride comfort analysis (3 degrees of freedom for sprung mass, 1 degree of freedom for each unsprung mass), 4 degrees of freedom based on semi-car model (2 degrees of freedom for the sprung mass and one degree of freedom for each of the two unsprung masses) and a 2 degrees of freedom model based on a 1 / 4 vehicle. [0003...

AI Technical Summary

Problems solved by technology

However, the factors considered in the models proposed by different scholars are not the same, and there is no modeling method that can integrate the classic two degrees of freedom such as suspension geometry, control arm moment of inertia, tire moment of inertia, tire damping, and tire lateral stiffness. The factors neglected in the model are taken into account, and the kinematics and dynamics analysis formulas of the model are given

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