摆冲试验机标准谱形库构建及调试方法研究

文章针对新研航天产品没有现成的控制谱形可借鉴的问题,为了获得试验规范要求的控制谱形,设计了冲击试验方案,通过开展大量试验采集试验谱形数据,由最小二乘法获得摆角、波形发生器、缓冲垫等各因素组合下的最优拟合曲线,并归纳汇总获得标准谱形,形成摆冲试验系统标准谱形调试数据库,再经过多个工程型号试验验证了其有效性和便捷性。分析摆角、波形发生器刚度、缓冲垫类型、夹具重量及装夹螺钉数量对冲击响应谱形的影响,总结形成摆锤式冲击试验机调试方法。研究成果有助于指导航天产品冲击响应谱试验控制谱形的快速确立,以缩短调试时间,降低试验风险。

Establishment of a standard spectrum library and the debugging method of pendulum SRS testing machine

In view of the fact that no existing control spectrum can be used as a reference for newly developed space products, the influencing factors for the shock response spectrum (SRS) are unknown, and experienced testers have to debug by trial and error to achieve the specified control spectrum, an SRS plan is designed in this paper by conducting abundant SRS tests to collect the spectrum data, and then the optimal fitting curves for different pendulum angles, cushions and waveform generator combinations are obtained by a proposed curve fitting algorithm. Then we gather all standard spectra, to establish the debug spectrum library. The effectiveness and the convenience of this library are demonstrated by practical engineering tests. In addition, by analyzing the effects of the pendulum angles, cushions, waveform generators, fixture weights and bolt numbers on the SRS, the debug method for the response spectrum testing machine can also be developed, for a faster determination of the SRS control spectra for space products, and the method can remarkably shorten the debug time, lower the testing risk, and provide a valuable reference for the SRS testing on the products in the next space station phase.