三自由度疲劳振动台的设计及固有频率分析

Design and Natural Frequency Analysis of 3D Fatigue Shaking Table

为模拟高速列车传动系统的多轴随机振动环境,建立了一种能对传动系统沉浮、侧滚、横摆三自由度振动模拟的三自由度牵引传动系统疲劳振动台模型.通过对系统进行运动学分析,利用三维振动台的位姿关系及振动台各分支刚度构造了刚度矩阵和质量矩阵,建立了振动台系统的无阻尼动力学方程,据此研究了系统不同姿态下的固有频率.该计算模型也可以用于其他类型的并联结构固有频率计算.计算结果表明:文中设计的振动台能够满足试验要求.

A design scheme for 3 D electro-hydraulic shaking table is proposed to simulate the random vibration environment of high speed train drive system. Three degree motions of ups and downs, roll and yaw can be real- ized. By kinematic analysis,the stiffness matrix and mass matrix of the 3D electro-hydraulic shaking sable i~ established by using its locations and orientations,and the no-damp kinetic equation of the shaking table sys- tem is developed. Accordingly the natural frequency of the shaking table is studied under different positions and orientations. This calculation model also has reference value for other types of parallel structure for natural fre- quency calculation. The calculation results show that the vibration table designed can meet the test require- ments.