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进行随机环境(振动或力)模拟的关键问题是产生满足试验标准要求的随机激励信号。文献推导了满足给定功率谱要求,幅值高斯分布、平稳遍历随机信号的合成方法。本文则在此基础上,根据谱不变性原则,推导了由高斯型随机信号直接变成幅值为其他概率分布的随机信号的转换公式,从而满足了更广泛的环境试验的需要。由仿真试验及对结果所进行的平稳性、幅值概率分布、谱的正确性等检验说明了这种任意幅值分布随机信号的合成方法是可行的。
The key issue in performing a random environment (vibration or force) simulation is to generate a random excitation signal that meets the requirements of the test standard. The literature derives a synthesis method that satisfies the given power spectrum requirement, amplitude Gaussian distribution, and smooth traversal of random signals. On the basis of this, based on the principle of spectral invariance, this paper deduces the conversion formula from Gaussian random signal to random signal whose amplitude is other probability distribution directly, so as to meet the needs of a wider range of environmental tests. The simulations and tests of the stability, the distribution of the amplitude probability and the correctness of the results show that the method of random signal generation with arbitrary amplitude distribution is feasible.