摘 要
管道運輸是一種重要的運輸方式，但是由于長時間的運行磨損以及各種自然因素和人為因素，會導(dǎo)致管道的泄漏，造成資源浪費、環(huán)境污染和經(jīng)濟損失。因此，及時有效地確定管道的泄漏點，是確保運輸安全的重要方式之一。本文針對課程設(shè)計的課題所描述的情境，針對具體實驗器材LabVIEW虛擬儀器和NI SCXI 1531采集加速度信號，，仿真模擬對氣體管道泄漏點的進行定位。
利用MATLAB軟件，運用信號分析與處理的基本方法，嘗試解決所提出的問題。主要為是用傅里葉變換對采集的信號進行頻域分析；利用高通濾波器，對采集的信號進行高通濾波用互相關(guān)方法計算信號的相對延遲時間，并計算出振源的位置
一維振源定位方法比較有效的是相關(guān)分析法，本文正式基于此，通過多次實驗，通過上述的步驟，統(tǒng)計分析所得實驗數(shù)據(jù)，最后排除可能是有人為好儀器誤差引起的不準(zhǔn)確的數(shù)據(jù)，通過值得信任的數(shù)據(jù)進行統(tǒng)計分析，最后通過距離計算振源信號波在實驗器材上（介質(zhì)）的傳播速度，并利用另一組數(shù)據(jù)來檢驗其是否正確，最后通過實驗證明本方法確實有用，最后計算的結(jié)果和時間的在誤差允許內(nèi)是一致的。





關(guān)鍵詞： 振源定位; 相關(guān)分析法 ; 傅里葉變換；高通濾波
ABSTRACT
Pipeline transport is an important mode of transportation, but because of long time running wear and all kinds of natural factors and human factors, will lead to a leakage of pipeline, resulting in waste of resources, environmental pollution and economic losses. Therefore, to determine the pipeline leak in a timely and effective manner, is one of the important ways to ensure transportation safety. Curriculum design topic, the author of this paper describes situation, LabVIEW virtual instrument for specific experimental equipment and NI SCXI 1531 collected acceleration signal, the simulation of gas pipeline leak location.
Using MATLAB software, and using the basic methods of signal analysis and processing, try to solve the issues raised. Mainly is to use Fourier transform to sampled signal frequency domain analysis; Acquisition of signals to make use of high-pass filter, high pass filter using cross-correlation method to calculate the relative delay time of signal, and calculates the vibration source location
One-dimensional vibration source location method is more effective is correlation analysis, this paper formally based on this, through the experiment many times, through the above steps, the statistical analysis of experimental data obtained finally ruled out may be a good instrument for error caused by inaccurate data, through trusted data statistical analysis, and finally through the signal wave in the distance calculation source experiment equipment (medium) on the velocity of propagation, and another set of data is used to test whether it is correct, the experiments prove that this method is indeed useful, the final calculation of the results and time within the permitted error is the same.



Key words：Source localization; Correlation analysis; Fourier transform; High-pass filte








目錄
摘 要 I
ABSTRACT II
1.緒 論 1
1.1 選題背景和意義 1
1.2 研究現(xiàn)狀 1
2. 虛擬儀器技術(shù)LabVIEW 2
2.1 虛擬儀器技術(shù)簡介 2
2.2開發(fā)流程 4
2.3本系統(tǒng)所用的LabVIEW 5
2.4 NI SCXI 1531功能說明 6
2.5運行環(huán)境綜合分析 8
2.6系統(tǒng)軟硬件分析 9
2.6.1系統(tǒng)軟件分析 9
2.6.2系統(tǒng)硬件分析 9
3.振源定位原理與方案 9
3.1振源定位的具體情形假 9
3.2振源定位原理綜述 11
3.2.1相關(guān)分析法 11
3.2.2時間序列分析法 12
3.2.3小波變換法 12
3.3相關(guān)分析法的可行性 13
3.3.1數(shù)據(jù)采集 15
3.3.2數(shù)據(jù)處理 15
4. 基于相關(guān)分析法在振源定位的設(shè)計 17
4.1總體實現(xiàn)框圖 18
4.2獲取輸入信號 19
4.3傅里葉頻域分析模塊 19
4.4濾波模塊 24
4.5求時差模塊 27
4.4統(tǒng)計分析 29
5. 基于基于matlab的仿真實現(xiàn) 29
5.1仿真程序結(jié)果展示 29
5.2仿真程序結(jié)果統(tǒng)計分析 32
5.3總結(jié) 34
結(jié)論 34
參考文獻 35
致謝 37
附錄 38