振动离心复合环境下结构响应试验研究

摘要

ABSTRACT:Objective To study vibration response and its transmissibility through the fixture of shaking table, the connection device of the hanging basket, and the head and the middle part of the centrifuge arm under the shaker working condition in a combined vibration and centrifuge environment. Methods According to the vibration system under different conditions, the acceleration reaction of the centrifuge arm and the connection device was measured to calculate the vibration acceleration transmissibility based on the shaking table. Results In the combined vibration and centrifuge environment, the experiment results showed that the vibration response decreased gradually through the shaking table, the connection device of the hanging basket, the head of the arm to the middle part of the arm and the vibration response was the minimum at the middle part of the arm, indicating a decreasing pattern of the response transmissibility. The vertical transmissibility was 9.4%, while the tangential transmissibility was 2.9%in the seismic test of the centrifuge structure. The tangential transmissibility was 3.1%, while the vertical transmissibility was 2.3%in the sine wave test of the centrifuge structure, and the transmissibility increased with the increase of beat frequency. The radial transmissibility was 2.3%, while the tangential transmissibility was 2.6% in the combined vibration test. Conclusion The vibration analysis provides a data reference for large and complex system design of centrifuge and model modification through this experiment in which the vibration response and the transmission pattern of the connection device and the centrifuge arm in a combined vibration and centrifuge environment were obtained.%目的：研究振动离心试验系统复合功能下的振动台体、吊篮连接装置、离心机机臂端头及机臂中部的结构振动响应特性及传递规律。方法根据复合振动激振系统在不同工况下，测量离心机机臂、连接装置等部位的加速度响应，以振动台体为基准，计算被测部位相对于台体的振动加速度传递比。结果在振动离心复合功能运行时，振动响应沿台体、吊篮连接装置、机臂端头到机臂中部逐级衰减，机臂中部处振动响应最小，响应传递比呈衰减规律；振动复合试验中机臂沿径向传递比为2.3%、沿切向传递比为2.6%；在正弦拍波试验中，机臂沿垂向传递比为2.3%，沿切向传递比为3.1%，传递比随拍波频率增大而变化；地震波试验中机臂沿垂向传递比为9.4%，切向传递比为2.9%。结论通过试验分析得到振动离心复合下离心机结构连接装置、机臂等位置的振动响应和传递规律，结果可为大型复杂离心机结构设计及模型修改等提供数据支持。