一种应变式超低频微振动测试台

An ultra-low frequency micro-vibration testing platform based on strain-resistance effect

为了测试卫星太阳翼驱动机构低频、超低频区由机电耦合产生的微振动，发明了一种应变式超低频微振动六分量测试台，该测试台低频响应特性好，安装接口灵活。介绍该测试台的工作原理和动态标定方法，并对该测试台进行了线性度检验、固有频率测试以及动态测试误差检验。通过线性度检验可得：在100 N范围内的外力作用下，组成该测试台的八个双孔梁应变式力传感器的线性度相对误差在＆#177;3．4％以内；通过固有频率测试可得：该测试台在100 Hz内没有固有频率，不会通过结构耦合对被测微振动信号进行调制；通过动态测试误差检验可得：在频域上0！100 Hz范围内，该测试台对六个分量动态测试的相对误差在＆#177;9．6％以内，同时还可以得出该测试台对三个力分量和三个力矩分量的测试分辨率分别可达到0．01 N和0．001 N＆#183;m。

In order to measure micro-vibration of a SADA （solar array drive assembly ） in low and ultra-low frequency zone caused by electromechanical coupling,a six-component testing platform based on strain-resistance effect was developed.Its response characteristic in low frequency zone was outstanding and its installation interface was flexible. The working principle and dynamic calibration method of this platform were introduced in detail.In order to assess the performance of this testing platform,linearity examination,natural frequencies measurement and dynamic testing error examination for it were done.The results showed that linearity errors of eight force sensors are within 3.4% under the action of external force within 1 00N;there are no natural frequencies within 1 00Hz,so that the micro-vibration signals can not be modulated through structural coupling in frequency domain of （0 -1 00Hz ）;dynamic testing errors of six components are within ±9.6% in frequency domain of （0 -1 00Hz）,testing resolutions of three forces and three moments can reach 0.0lN and 0.001 N.m,respectively.