valid data signal 中文意思是什麼
valid data signal
解釋
有效數據信號-
At last, the valid data based fast emd algorithm was proposed. chaper five aimed to the requirement of the emd based time - frequency analysis in the field of rotating machinery signal analysis and fault diagnosis. studied the method of rotatory speed prediction to improve the precision of complete period sampling of vibration signals in rotating machinery, then, discussed the phenomenon of mode fission in noise signal anlysis by emd and provided the filter method to weaken the phenomenon. after then, found a process to analysis the signals using emd - based method in the field of rotating machinery signal analysis and fault diagnosis
第五章針對旋轉機械信號進行emd時頻分析的要求，提出了提高整周期采樣精度的預測演算法和適合於單片機計算的近似公式；論述了模態裂解現象，並通過模擬信號和實際信號的研究，提出了使用濾波技術來減弱模態裂解現象的方法；給出了適合於旋轉機械振動信號基於emd時頻分析的工作步驟；研究了基於emd的旋轉機械振動信號自適應濾波技術。 -
Chapter two introduced the basic ideas of emd theories briefly, and then discussed the emd - based time - frequency analysis method ' s basic agrithom. the conclusion was deduced that the method is valid in the field of signals processing and fault diagnosis in rotating machinery by simulation and real signal analysis. chapter three discussed the origin of emd method ' s end effect, then studied the direct, time - series based and neuron network based data extention technologys to weaken the end effect
第二章介紹了基於emd時頻分析方法的一些基本概念；闡述了emd方法和基於emd的希爾伯特變換的基本原理和演算法；在此基礎上，用基於emd的時頻分析方法對模擬和實際信號進行了分析驗證，結果表明把該方法引入旋轉機械振動信號時頻分析和故障診斷領域是有效的。
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