有做过ansys PSD 分析的吗? 70
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One or more diagonal terms of the modal covariance matrix (i.e., when mode i = mode j) is negative. The 1 sigma results may be incorrect as a result of the input PSD curve being improperly represented. Please review the results carefully.
如上,随机振动仿真有这个警告,但是我不知道如何解决,请问有大神帮忙吗~?
做一次模态分析,看看是否有刚体模态 (频率为零或非常接近 0),如果有零频率,采用力激励的 PSD 分析是不能做的