基于小波变换的含间隙太阳能帆板动力学试验分析  

A wavelet transform based analysis of vibration signals from a solar array with clearance

作　　者：荀剑[1] 阎绍泽[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084

出　　处：《清华大学学报（自然科学版）》2006年第11期1844-1847,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50275080)

摘　　要：为了有效地提取含间隙可展结构振动信号中所包含的动力学特征量,在分析传统Fourier方法局限性的基础上,引入基于小波变换的数据处理和分析方法。对含间隙太阳能帆板在收拢和展开状态下施加单脉冲的激励,测试标志点的加速度信号,系统地分析了间隙对动力学性能的影响。结果表明:小波变换能够较好地表征含间隙可展结构的时频特征信息,可以得到系统的频带以及各个频度衰减的速度和时间。实现了对航天可展结构动力学性能在时频域内的“精细”考察,将有助于提高航天器结构的分析与设计水平。A wavelet transform technique was developed to analyze the dynamic parameters in measured vibration signals from deployable structures with clearance which can not be analyzed with fast Fourier transforms. The acceleration of the sign point was analyzed to study the changes caused by various clearances in the deployed and folding configurations. The results show that the wavelet transform can obtain the tlme-frequency domain information, the frequency band, the attenuation velocity and the attenuation time of different frequencies. The results provide precise measurements of the dynamics characteristics of the space deployable structure in the time frequency domain, which are helpful for improving the system analysis and design.

关 键 词：振动 间隙 太阳能帆板 小波变换 可展结构 

分 类 号：TH113.1[机械工程—机械设计及理论]