冲击响应谱时域合成算法研究

A Study for Time-history Waveform Synthesis of Algorithm in Shock Response Spectrum (SRS).

目的为电动振动台实现模拟爆炸冲击环境提供一种有效的在线时域合成方法。方法根据冲击响应谱时域合成的一般原则 ,选择一种波形 (合成小波WAVSYN) ,研究时域合成的方法及合成过程中的几个主要参数对波形形状、加速度幅值和作用持续时间的影响。为使冲击响应谱满足精度要求 ,给出了冲击谱值修正方法。同时 ,为确保合成的加速度峰值在电动振动台许可范围内 ,给出了一种时域优化方法。结果用本文介绍的时域优化算法结合冲击谱值修正方法 ,可以计算合成一时域信号 ,满足波形参数符合规范及电动振动台使用要求 ,同时冲击响应谱满足精度要求。结论数值例子表明本文所提算法是有效的 ,用该算法合成的时域 。

Objective To present an effective on line SRS time history waveform synthesis method for simulating pyrotechnic shock environment with electrodynamic shakers. Method A procedure was developed for synthesizing a SRS time history waveform according to a general principle. The effect of three main parameters to waveform's shape, amplitude of acceleration and duration were investigated. A modification method of SRS's amplitude and an optimal algorithm of time history waveform were presented. Result The algorithm was used to generate a time history waveform that could satisfy SRS's accuracy requirement and electrodynamic shaker's acceleration limitation. Conclusion The numerical example indicates that the developed method is effective. The synthesized time history waveform can be used to simulate pyrotechnic shock environment using electrodynamic shakers.