...非平稳特性；PID断纸预测器 [gap=1167]words：112dimension cepstrum；paper breaking prediction；paper breaking parameters；non-stationary property；paper breaking PID predictor ..
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频率非平稳特性 Frequency Non-Stationarity
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地震动是典型的非平稳随机过程，其非平稳特性对结构响应影响极大。
Earthquake motions are regarded as the typical non-stationary stochastic processes, and such non-stationary characteristics influence the structural response greatly.
针对数控机床机械系统的非线性和振动信号的非平稳特性，引入局域波分析方法。
Then, Local Wave method is introduced in consideration of the non-stationarity characteristic of the vibrating signals from NC machines.
因此采用能反映时频非平稳特性的时变谱密度(即局部谱密度)来描述地震地面运动是非常必要的。
Consequently, it is necessary to describe earthquake ground motion with local spectral density, which is time-dependent and can reflect the non-stationary characteristics.
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