6自由度激励台共振频率分析与试验  

Resonant Frequency Analysis and Experiment on 6-DOF Excitation Platform

作　　者：黄舟[1] 黄海[2] HUANG Zhou;HUANG Hai(Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan China;School of Astronautics, Beihang University, Beijing 100191, China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621999 [2]北京航空航天大学宇航学院,北京100191

出　　处：《噪声与振动控制》2018年第A02期418-421,共4页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51505445)

摘　　要：6自由度激励台可用于航天器有效载荷的地面多轴同步环境模拟试验,在进行高频振动试验时,激励台自身结构产生的共振会直接影响试验结果的准确性。为使激励台整个结构系统的基频在工作频带之外,需在结构设计时分析其共振频率。首先根据激励台结构特性,通过分析运动工况建立激励台系统和台面的有限元模型,对比仿真和试验结果可知系统1阶振动模态为台面的局部模态,并且台面模态分析的边界条件为过铰链点的杆向约束。最后,利用扫频试验验证了台面仿真模型结果合理准确。由于台面计算规模远小于系统模型,便于后续的结构优化。Six degrees of freedom（6-DOF） excitation platform is a high accuracy platform used to simulate the multiaxis synchronous environment of the spacecraft payload. When the platform is applied in high frequency vibration test, the resonance of the structure would strongly influence the accuracy of test results. To make the first-order natural frequency of platform higher than the working frequency, the resonant frequency should be analyzed when designing the structure. Based on the structural dynamic characteristics and working condition, the finite element models of the platform and its table are established. After the comparison with simulation and test results, it is found that the first order vibration mode is the local mode of the table and the boundary condition is accurately defined. Finally, the results of the simulation model are verified by the frequency sweep test. As the computing scale of table is much smaller than the system model, it can be easily used for subsequent structural optimization.

关 键 词：振动与波 6自由度激励台 共振频率 台面 有限元法 边界条件 

分 类 号：V416.2[航空宇航科学与技术—航空宇航推进理论与工程]