尾波譜 的英文怎麼說
中文拼音 [wěibōpǔ]
尾波譜
英文
coda spectrum-
In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source
摘要基於李家峽水電站雙排機組振動的現場試驗研究，並且針對傳統頻譜分析方法傅立葉變換（ fft ）對于非平穩信號已力不從心這一缺陷，利用小波分析方法在時域和頻域上同時具有良好的局部化性質，通過對開停機這一典型非平穩過程信號進行小波及小波包分析，將其分解到不同頻帶內，獲取微弱信息和提取優勢頻率，並對其作振源分析，得出開停機初始時刻因水流不穩均出現強烈的振動現象，且低頻段信號能量最大，開停機過程水流脈動壓力和尾水渦帶擺動是引起定子基礎振動的主要原因。Flow separation produces pressure fluctuations of large amplitudes, possibly with the dominant frequencies differ from up - stream blade wake passing frequency and its harmonics
尾緣氣流分離產生的壓力波動頻譜中含有上游葉片尾跡頻率及其倍頻的分量，但其頻譜可能比較復雜，並非單一地受上游葉片尾跡影響。( 2 ) discuss how to use the information from rs to distill the environmental geologic factors discuss the method for distill the surface sink, landslip, etc. from dtm, water, residential area, vegetation, gold mine points, gangue warehouse, etc. from spectrum analysis, roads, ground split, falls, etc. from crisp and eye distinguish
（ 2 ）探討利用遙感信息進行環境地質因素的提取方法對各環境地質要素進行遙感信息的提取，探討了基於數字地面模型的地面塌陷、崩塌等要素的提取方法；基於波譜分析的水體、居民區、植被、金礦點、尾礦庫等要素的提取方法；基於邊緣增強、目視判讀等方法的線狀要素如道路、地裂縫、構造線的提取。The lost work came to light in july when heather carbo, a librarian at the palmer theological seminary outside philadelphia, was cleaning out an archival cabinet
卡波負責重新整理檔案，就在這個龐大的計劃接近尾聲時，她在圖書館地下室的最後一個柜子里看到這份樂譜。分享友人