考虑限位器的汽车非线性系统振动特性

Nonlinear Vibration Characteristics of Automobile with Retainer Considered

建立了考虑限位器的悬架非线性隔振系统的数学模型.对引进弹性限位器且不考虑限位器接触问题的弹簧阻尼系统悬架进行了力学分析,利用系统动力学和随机振动理论,将汽车简化为1/2的四自由度模型,建立了考虑悬架隔振系统非线性特性的整车系统在路面随机激励下的非线性动力学方程,最后用Monto Carlo法模拟路面随机激励谱,在时域内对整车非线性系统振动特性进行仿真,并与传统的考虑线性悬架系统的整车动力学特性进行对比,以研究悬架隔振系统非线性特性对汽车平顺性的影响.

This paper firstly establishes mathematical models for the retainer-considered nonlinear vibration isolation system of suspension, conducts mechanical analysis on the suspension of spring damping system in terms of using spring retainer and contact without considering retainers. With system dynamics and the random vibration theory, the vehicle will be reduced to 1/2 of the four degrees of freedom model to establish the nonlinear dynamics equation of the full automobile system with the characteristics of nonlinear vibration isolation system considered when randomly excited by road surface. Finally, this paper uses Monto Carlo method to simulate road random excitation spectroscopy, to emulate the nonlinear vibration characteristics of entire automobile, and compares with the dynamic characteristics of entire automobile with linear suspension system considered so as to study the impact of nonlinear characteristics of suspension interval vibration of the suspension on automobile ride.