基于七自由度整车模型的汽车振动特性分析  

Study on Dynamic Characteristics of Vehicle Based on the Whole Vehicle Model with 7 Freedom

作　　者：王娟[1] 李同杰[1] 孟令启[1] 

机构地区：[1]安徽科技学院机电与车辆工程学院,安徽凤阳233100

出　　处：《安徽科技学院学报》2013年第1期72-76,共5页Journal of Anhui Science and Technology University

基　　金：安徽省高校优秀青年人才基金项目(2012SQL139);安徽科技学院预研项目(ZRC2012314)

摘　　要：本文建立了独立悬架汽车整车七自由度动力学模型,推导了振动微分方程,运用数值仿真的手段研究了汽车悬架阻尼系数、刚度等设计参数对汽车振动特性的影响规律。结果表明,在共振区域附近,相对较大的刚度,会导致汽车的乘适性下降,但在共振区以外的高频区,刚度对汽车振动幅值的影响并不大;后桥悬挂阻尼对汽车振动幅值的影响较前桥强烈,适当增大后桥悬挂的阻尼有利于振动幅值的降低。A dynamic model of a whole vehicle with independent suspension is established, and the vibration differential equations of the model with 7 freedoms are derived. The numerical algorithm called Newmark -β is adopted to simulate the dynamic characteristics of the system and the influence rules of some parameters of the vehicle, such as damp and stiffness, on the dynamic characteristics of vehicle are studied. The results reveal that in the resonance region, a larger stiffness will cause the riding comfort of the car to decrease, but in high fre- quency area that is outside of resonance region, the effect of stiffness on vibration amplitude of the car is not notable; The effect of driving axle suspension damper on car vibration amplitude is stronger than front axle, and suitable enlargement of damping of driving suspension will reduce the vibration amplitude.

关 键 词：整车模型 独立悬架 动力学特性 仿真 

分 类 号：V463.33[航空宇航科学与技术—航空宇航制造工程]