次聲監測 的英文怎麼說
中文拼音 [cìshēngjiāncè]
次聲監測
英文
infrasound monitoring-
Infrasound monitoring system
次聲監測系統Even before world war i, the detection of infra - sound had been employed in locating strong explosions
早在第一次世界大戰前，次聲已用於偵測爆炸的位置，在冷戰期間亦被用來監測大氣中的核試驗。The survey result made by hengshui environment survey station shows that the air pollution in hengshui in recent years is mainly due to coal fume and second - time dust and the water pollution is very serious and noise pollution is far beyond the standard
摘要據衡水市環境監測站監測結果表明：近幾年衡水市空氣污染主要屬于煤煙和二次揚塵混合型污染；水質污染嚴重，噪聲污染嚴重超標。It was a hot topic during the cold war period to monitor nuclear tests in the atmosphere. the " comprehensive nuclear test ban treaty " required that a global network of infra - sound sensors be installed to monitor abnormal explosions in the air
全球正在推動的」全面禁止核試驗條約」中，便要求在全球范圍內設立次聲監測網，以監察在大氣中有否異常的大規模爆炸。An alternative to traditional pipe detection method is to excite stress waves, which can propagate along the pipe, and to monitor the response of the pipe for changes in the received signal at some remote positioa an ultrasonic inspection technique using guided waves was applied to detect and determine the exact location of flaws in long steel pipes
而傳統無損超聲檢測技術是單點檢測，因而，在檢測長距離管道時，這種方法遇到很大困難。而利用縱向超聲導波檢測管道缺陷，激勵導波沿管道傳播，通過監測管道回波的變化，達到一次檢測數十米的管道範圍，並且是全范圍檢測。It also studies the influencing factors including sampling frequency, pd waveform, decline time, time intervals between pd pulses, mother wavelet, center frequency of interference, entropy threshold value and snr. in addition, it applies wavelet packet method （ wpm ） for non - stationary signal de - noising in on - line pd monitoring and analyzes the processing results under different pd waveform, sampling frequency and noise level. firstly, the curve of pd
基於小波包變換的非平穩信號消噪演算法（ wpm ）已較為成熟，本文將其應用於局部放電在線監測，通過研究其對不同局放波形、采樣率、噪聲水平下的處理效果，首次提出了理想白噪聲條件下提取局部放電信號的曲線，分析了各種因素對該演算法下信號失真的影響。Second, introduce the dyadic wavelet analysis, and use it realized the signal monitor and analysis to the turbine compressor, obtained the detail signal and approach signal at different frequency parts of the compressor s original signal. one type of electromotor that made in china is choose, and it s noise is tested. the noise signal is analyzed by wavelet analysis and spectrum analysis. several high spectral peaks that make people hearing disameniry are found. by contrast with theory calculating results and farther analysis. the cause that producing these spectral peaks is located
其次，介紹了二進小波分析，並應用二進小波分析實現了對透平壓縮機信號的監測分析，得到了壓縮機原始信號在不同頻率段分解的細節信號和逼近信號。用小波分析和譜分析相結合的方法對某國產電機的噪聲進行了分析，找出了人的聽閾不閱的幾個高譜峰位置，進行了空氣動力噪聲計算，通過與理論計算結果進行對比分析，進一步找出了產生該頻閩譜峰的幾個原因，第三，介紹了諧波小波和分形的基本原理。分享友人