power-spectral method 中文意思是什麼
power-spectral method
解釋
光譜法-
It is studied that small inclusions in aluminum alloy are detected by ultrasonic transmission method in this paper. frequency analysis of the ultrasonic signal is done. harmonic factor and relative valid spectral power are calculated
本文採用超聲穿透法對ly12鋁合金板材細小夾雜物進行了檢測試驗研究，並對超聲信號進行了頻譜分析，計算了諧波系數和相對有效譜功率。 -
4 different types ’ features were generated, namely ar model parameters, power spectral frequency band intensity, energy for wavelet packet decomposition, wavelet packet entropy. every type of features were extracted respectively using pca and ica method and classified using linear neural network, knn and bp network
建立了ar模型參數、功率譜估計頻帶強度、小波包分解能量比率、小波包熵四種特徵，分別使用pca與ica進行特徵提取，採用線性神經網路、 k -緊鄰法、 bp神經網路四種分類器進行分類。 -
So it is essential to diminish the errors and enhance its anti - jamming ability. an innovative method of measuring pipeline thickness based on power spectral evaluation computing has been put forward. besides, experiments on the on - line measurement have yielded good results, proving the veracity and reliability of the measurement
介紹了為減小系統的測量誤差、提高系統抗干擾能力而進行的對超聲波回波信號的分析研究工作，創新地提出了一種基於對超聲脈沖多次反射回波功率譜估計的超聲測厚方法，並通過實驗證明了該方法用於在線檢測的準確性與可靠性。 -
In this paper, based on the wavelet theory which is considered an important breakthrough to fourier analysis, the variations of air temperature and precipitation during the recent 50 years in heilongjiang province have been analysed using the morlet wavelet transformation method. wavelet transformation with fourier power spectral analysis are compared
本文以近年來被認為是fourier分析方法突破性進展的「小波理論」為基礎，採用morlet小波變換方法分析了黑龍江省近50年來的氣溫和降水的變化規律，並與傳統的功率譜分析結果進行了比較。 -
The paper creatively proposes the idea ofusing ordinary pressure signals ; ( pressure in valve boxes ) as system feature signal to pickup fault characteristic eigenvectors and verifies the correction of the method through self - correlation analysis in the time - zone and power spectral and wavelet packet analysis in the frequency - zone
為此，本文創造性地提出以常見的壓力信號（閥箱內的壓力）作為系統特徵信號來提取故障特徵向量的方法。這種方法信號測取簡單、處理方便，有著振動信號方法無法比擬的優點。 -
In order to design wavelength insensitive power splitter based on soi, the wavelength characteristic of mach - zehnder interferometer were investigated by means of bpm and fdm ( finite - difference method ). then the parameters of mach - zehnder interferometer were optimum designed using genetic algorithm. besides, genetic algorithm is also used to optimize the upper tier parameters of mzi based silica - on - silicon to attain a flat spectral response
為了設計對波長不敏感的soi材料的mz功分器，利用束傳播法（ bpm ）和有限差分模式解方法（ fdm ）對mach - zehnder結構的組成部分定向耦合器和相位延遲部分做了波長相關特性的計算，然後通過遺傳演算法優化設計了mach - zehnder的結構參數。 -
Based on the memorial characters of restoring forces, the equivalent parameters of the bilinear and bouc - wen hysteretic system were gotten by using stochastic equivalent method. then, both the stationary and non - stationary random response of hysteretic system with cubic rigidity and sticky damp were deduced and calculated. in the research of colored white noise, the filter for shaping the power spectral density was designed and the random state response of enlarged vector was gotten
對平穩白噪聲，給出了平穩響應的求解方法並對平穩狀態下的模型參數對響應的影響進行了比較與分析;在有色白噪聲的研究里，通過有色白噪聲的擴階方法和構造成型濾波器來計算有色白噪聲的響應，從而解決一類工程實際振動問題的模擬模擬。
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