硬式光滑非线性振动系统隔振模型仿真分析

Simulation and Analysis of Hard Smooth Nonlinear Vibration Model in Vibration Isolation System

将电磁振动给料机及摩擦摆等工程方面的硬式光滑非线性振动系统引入到汽车的隔振系统中,依据隔振和硬式光滑非线性系统的基本模型,推导计算相关动力学方程,得到受迫振动条件下相应的幅频响应关系式。分析得知,通过减小阻尼比,降低弹簧静形变,并在一定范围内增大非线性恢复力的三次项系数,可明显降低振动幅值,增强隔振效果。同时通过Matlab软件,仿真得到系统的幅频响应特性曲线。对比仿真表明,硬式光滑非线性振动系统的有效设计可提高车辆交通工具的舒适性、稳定性,这样的设计有一定的工程参考价值。

Hard smooth nonlinear vibration system which has been used in electromagnetic vibrating feeder and friction pendulum engineering is introduced to the vibration isolation system of cars. From the basic vibration isolation and smooth hard nonlinear vibration model of restoring force,through dynamic formulas,the paper gets the corresponding relation between the amplitude and frequency under the condition of forced vibration. Decreasing the damping ratio,reducing spring static deformation,and increasing three nonlinear restoring force coefficient within a certain range can obviously reduce the vibration amplitude. At the same time,through the simulation software Matlab,we get the exact image of amplitude-frequency characteristic curves. By comparative analysis,it can come to the conclusion that it contributes positively to vehicle comfort and stability. The research has certain reference value to engineering design.