frequency instability
... frequency factor频率因数 frequency instability频率不稳定性 frequency jumping频率跃变 ...
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利用频响函数识别复频率模态质量存在着严重的数值计算不稳定性，给物理参数的识别造成困难。
The severe numerical instability in complex frequency modal mass identification from frequency response function makes it difficult to identify physical parameters.
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