CAE simulated prediction method of road vibration and noise of vehicle

Abstract

The invention aims at providing a CAE simulated prediction method of road vibration and noise of a vehicle, and the method can be used to analyze vibration and noise, caused by that the vehicle loads spindle load, excited by the road, provide convenience for rectification later and improve the NVH performance of the vehicle. The CAE simulated prediction method comprises the following steps that A) the acceleration of a knuckle of a sample vehicle is tested, and an acceleration signal matrix Ga of the knuckle is obtained; B) a finite element method or an experimental test method is used to obtain a transfer function Hs from the wheel center to the knuckle; C) according to the transfer function Hs from the wheel center to the knuckle and the acceleration signal matrix Ga of the knuckle, the spindle load Gf is calculated on the basis of a spindle load theoretical formula Gf=Hs+GaHs+H, wherein + represents pseudo-inverse, and H represents conjugate transposition; and D) an NVH finite element simulation model of the vehicle is established, the spindle load Gf is loaded in the wheel center of the finite element simulation model, and a vibration-noise curve in the vehicle is calculated.

Description

technical field [0001] The invention relates to the field of computer-aided engineering (CAE), in particular to a computer simulation prediction method for automobile vibration and noise. Background technique [0002] In-vehicle vibration and noise caused by road surface excitation are important reasons affecting passenger comfort. There are generally two ways to reduce the vibration and noise: 1. Prototype vehicle adjustment, that is, to measure the noise and vibration inside the prototype vehicle. If it exceeds the target requirements, then check the vibration isolation system and the test methods used in the vehicle. The defects are Weakness analysis is not sufficient. In addition, because the prototype car is in the later stage of development, it is difficult to fully rectify some problems in time; 2. In the prototype stage, through the test of the contact point load between the body and the suspension, the problem is analyzed with the help of CAE simulation. Solve prob...

AI Technical Summary

Problems solved by technology

There are generally two ways to reduce the vibration and noise: 1. Prototype vehicle adjustment, that is, to measure the noise and vibration inside the prototype vehicle. If it exceeds the target requirements, then check the vibration isolation system and the test methods used in the vehicle. The defects are Weakness analysis is not sufficient. In addition, because the prototype car is in the later stage of development, it is difficult to fully rectify some problems in time; 2. In the prototype stage, through the test of the contact point load between the body and the suspension, the problem is analyzed with the help of CAE simulation. Solve problems whose flaw is the inability to analyze the weaknesses of chassis parts or chassis paths