六自由度变胞振动试验台结构设计与动态特性分析

振动试验台是用于模拟真实振动环境的重要设备,通过建立六自由度变胞振动试验台测试系统、动力学模型及运动方程,应用ANSYS Workbench软件对振动台进行静力学分析,应用模态分析和谐响应分析模块对蛇形板簧与动平台进行动态特性分析,避免薄弱部件固有频率接近振动台工作频率而发生共振。结果表明：蛇形板簧最小共振频率发生于480 Hz附近,动平台最小共振频率发生于450 Hz附近,都远大于振动台正常工作频率：50～60 Hz,满足使用要求,为50～200 Hz机械振动台及超过2 000 Hz的超声波振动时效设备结构设计提供理论依据；并对未来多维振动设备的结构设计及工作性能分析提出展望。

Structural Design and Dynamic Characteristic Analysis of Six Degree of Freedom Metamorphic Vibration Test-bench

Vibration test-bench is an important equipment used to simulate the real vibration environment. By establishing the test system, dynamic model and motion equation of the six-degree-of-freedom metamorphic vibration test-bench, the static analysis of the shaking-table is carried out by using ANSYS Workbench software, and the snake leaf spring and the moving platform are carried out by using the modal analysis and harmonic response analysis module. The dynamic characteristic analysis avoids the resonance of the weak parts whose natural frequency is close to the working frequency of the shaking table. The results show that the minimum resonance frequency of serpentine leaf spring occurs near 480 Hz, and that of moving platform near 450 Hz, which is much larger than the normal working frequency of shaking table: 50-60 Hz, which meets the requirements of operation. It provides the structural design of 50-200 Hz mechanical shaking table and ultrasonic vibration aging equipment over 2 000 Hz. The theoretical basis and the prospect of structural design and performance analysis of multi-dimensional vibration equipment in the future are put forward.