六自由度变胞振动试验台结构设计与动态分析

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

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2000 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。

A vibration test-bench is an important equipment for simulating vibration environment.A six-degree-freedom vibration test bench in metamorphic mechanism was designed,for which dynamic model and motion equation were used and static analysis performed in ANSYS Workbench software,and modal analysis applied.The applied modal analysis and harmonic response analysis were conducted to analyze the dynamic characteristics of the serpentine leaf spring and the moving platform to avoid resonance of the natural frequency of weak component close to the operating frequency of the test bench.Results show that the minimum resonance frequency of the serpentine leaf spring occurred near 480 Hz,and the minimum resonance frequency of the moving platform near 450 Hz,which were much greater than the normal working frequency of 50~60 Hz.The outcome of this study may provide a theoretical basis for the structural designs of 50~200 Hz mechanical vibration bench,and over 2000 Hz ultrasonic vibration aging equipment.At last,the future structural design and performance analysis of multi-dimensional vibration equipment were proposed.