安装液压互联悬架货车的机械液压多体系统建模及模态分析  

Modeling and Modal Analysis of Multi-body Truck System Fitted with Hydraulically Interconnected Suspension

作　　者：丁飞[1] 张农[1] 韩旭[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《机械工程学报》2012年第6期116-123,共8页Journal of Mechanical Engineering

基　　金：国家杰出青年科学基金(10725208);教育部长江学者与创新团队发展计划(531105050037);湖南大学汽车车身先进设计制造国家重点实验室自主课题(61075003)资助项目

摘　　要：针对传统悬架无法实现同时对车体俯仰和垂向振动模态的协调控制,提出一种新型液压互联悬架系统。运用传递矩阵法推导出液压子系统的阻抗阵,并建立机械多刚体和液压系统耦合的多体动力学方程。针对该类频率依赖特征方程的特征值问题,提出一种基于数值优化的特征值辨识方法,并验证该方法的有效性。运用模态理论,对比分析液压互联悬架系统对三轴重型货车车体振动模态影响的不同。结果表明,俯仰平面内的抗反向运动的液压互联悬架系统能在保持原有乘坐舒适性的同时,能有效抑制车体俯仰运动;安装抗反向运动的液压互联悬架系统后,车体俯仰刚度增强,其垂向振动刚度略有降低;同时车体和车轴振动峰值被极大地降低,车体振动衰减率明显增大。A novel hydraulically interconnected suspension system is proposed for compromising the control between the pitch and bounce mode of sprung mass.Based on the transfer matrix method,the impedance matrix of hydraulic subsystem is derived,and the mechanical and hydraulic coupled multi-body dynamic equations are then obtained.An eigenvalue iteration identification method for frequency dependent system characteristic equation is developed based on numerical optimization,and the validity of this method is then verified.By applying the theory of complex mode,the comparison analysis of vibration of sprung mass is carried out between the tri-axle truck with a convention suspension and that fitted with the hydraulically interconnected suspension system.The obtained results indicate that the anti-oppositional hydraulically interconnected suspension system is able to effectively reduce the pitch motion of sprung mass in pitch plane,and simultaneously maintain the ride comfort performance.The pitch stiffness is increased while the bounce stiffness is slightly softened.The peak values of sprung mass and wheel hop motions are greatly reduced,and the vibration decay rate of sprung mass is also significantly increased.

关 键 词：液压互联悬架 阻抗阵 特征值辨识 模态分析 

分 类 号：U463[机械工程—车辆工程]