zoom of spectrum 中文意思是什麼
zoom of spectrum
解釋
頻譜展寬-
From theoretical analysis, we know the existing demodulation methods have limitations as following : one is that the subtraction of the two signals frequencies will display as the result of demodulation when we demodulate two time - domain adding signals without modulating information ( fault information ) ; the other one is that aliasing phenomenon will occur as a result of getting absolute value, detection or square in the process of generalized demodulation analysis, such phenomenon will result in some superfluous frequency composition on the frequency spectrum, which will puzzle the detec tion of mechanical vibration. if the sampling frequency is selected from a suitable range, the aliasing phenomenon will be avoided ; the last one is that aliasing frequencies will be produced in zoom demodulation analysis because this algorithm cannot employ digital low - pass filtering to avert the folding frequencies of higher harmonics in the process of zoom sub - sampling
現有的解調分析方法存在以下三種局限性：將不包括調制信息（故障信息）的兩時域相加信號，也以其頻率之差作為解調信號而解出；廣義檢波濾波解調分析中，由於取絕對值、檢波或平方過程可能產生混頻效應，在解調譜中表現為無法分析的頻率成分，並由此推導出避免這種混頻現象的采樣頻率的選取范圍，從根本上避免此類誤診斷的產生；幾種細化解調分析新演算法中，因為無法在細化分析的選抽時進行數字低通濾波，有可能會出現調制頻率的高次諧波成分發生頻率混疊而反折到低頻部分的現象。 -
Principle and method of multiple modulation zoom spectrum analysis based on multiple analytical band - pass filter
基於復解析帶通濾波器的復調制細化譜分析原理和方法 -
Generally analyses vibration signals of gearcase in some roiling mill by using various spectrum analytical methods ( such as zoom apectrum and cepstrum ), and finds out that source of exceptional vibration is owing to imbalance of the whole gearing. through assembly adjusting and carrying out dynamic balance test finally solves problems of production practice and ensure that the product line is put into production on schedule
摘要利用各種頻譜分析手段（細化功率譜和倒頻譜）對某軋鋼廠齒輪箱振動信號進行了全面分析，發現整個傳動裝置產生的不平衡導致齒輪箱振動異常，經過裝配調整，並做了動平衡試驗，有效地解決了這一問題。
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