车载DVD机芯振动性能研究

为了研究车载DVD机芯的振动性能并进行优化设计,建立了一个6自由度的车载DVD机芯振动系统模型。从机械系统动力学理论出发,参照振动系统的“质量弹簧阻尼”模型,分析推导了系统动力学平衡方程,得到了质量矩阵、弹性矩阵及阻尼矩阵的具体表达式。利用M ATLAB及其S im u link工具箱,建立了一个多输入多输出动力学系统模型,对多个复杂耦合的参数变量进行了仿真研究。结果表明:稳态低频特性和瞬态特性决定着机芯振动性能,它们与弹性系数和阻尼系数的大小相关;振动转角对机芯边缘振动位移量贡献较大,它与弹簧和阻尼器的分布状态有关。

Vibrations in mobile DVD mechanisms

A six degrees of freedom(DOF) model for a mobile DVD mechanism was developed to analyze the vibrations so as to optimize the mechanism design.Dynamics theory and the "mass-spring-dashpot" system model were used to develop an equilibrium equation.The mass matrix,elasticity matrix and damping matrix were given.MATLAB and Simulink were used to build the multiple input/output kinetic model and to simulate the effects of various parameters that are coupled in complex ways.The results show that the system vibrations depend on the low-frequency steady-state characteristics and the transient characteristics and that they vary with the elasticity and damping coefficients.The rolling motion of the mechanism,which contributes strongly to the rim displacement,is related to the distribution of the springs and the dampers.