A big part of this thesis discusses the detection and parameter estimation of periodic components with several algorithms.

本文主要内容是讨论几种经典算法对周期信号的检测和参数估计。

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To evaluate the influences of the stochastic component on apparatus, it is necessary to remove the periodic components from the vibration signal.

为评估随机成分对设备的影响，需要将周期成分从振动信号中去除。

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As wavelet module maxima occur at peaks of signal, the pretreatment removes power frequency periodic components from electric signal and thus avoids misjudgments of fault.

通过预处理滤除工频周期分量，消除了小波变换在信号峰值处的模极大值，从而避免了对故障的误判。

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And as age changes the physical condition and interactions of weapons' components and materials, the probability will increase that -- without a renewal of periodic testing -- such defects will increase in severity and number.

CENTERFORSECURITYPOLICY: A credible nuclear deterrent