U17 10220 UDC624
Thesis for the Master degree in Engineering Research on Negative Pressure Wave Simulation and Signal Processing of Fluid-Conveying Pipeline Leak Candidate:Chen Hao Tutor: Xue Jinghong Specialty: Structural Engineering Date of oral examination: 24th March.2012 University: Northeast Petroleum University
I
FLUENT MATLAB II
Research on Negative Pressure Wave Simulation and Signal Processing of Fluid-Conveying Pipeline Leak ABSTRACT At present, with the develop of China's rapid economic oil and gas resources has become increasingly urgent demand. Pipeline as an important way of oil and gas transport has many advantages. However, due to various natural or man-made causes, pipeline leak accidents have occurred, as well may be accompanied by a huge loss of life and serious environmental pollution. This paper research on finite element analysis of pipeline leak under various conditions and negative pressure wave data, determine the leak location of pipeline. the specific work as follows: First, domestic and international pipeline leak location methods of negative pressure wave are reviewed in this paper.in-depth study of the universal application of negative pressure wave. Second, determine the two-dimensional pipe flow model. Determine the physical model first, and then use the finite element software FLUENT analysis the leak pipeline model and get negative pressure wave data under various conditions. Third, improve the traditional formula of leak location, Based on the location accuracy of the negative pressure wave, improve the location accuracy by considering the vector sum of fluid velocity and negative pressure wave velocity in the pipeline. Fourth, develop a MATLAB graphical user interface program, it contains the signal processing function. In order to simulate the actual operation pipeline, negative pressure wave data is to plus the noise and then eliminate the noise. By adding a switch to control plus noise, in the practical application of the program could close it. Use this program to analysis accuracy of location. Keywords: fluid-conveying pipeline, location formula improve, pipeline leak, negative pressure wave simulation, wavelet denoising III
1 2 MATLAB IV
1.1 [1] [2] 1.2 1
[3][4] 1.2.1 1.2.1.1 [5] [6] 1.2.1.2 [7][8] 1.2.1.3 [9][10] 2
1.2.1.4 [11][12] 1.2.2 1.2.2.1 [13][14] 1.2.2.2 [15][16] 1.2.2.3 [17] 3
1.2.2.4 [18][19][20] 1.2.2.5 [21][22] 1.2.2.6 [23][24][25][26] 1.2.2.7 [27][28][29] [30] 4
1.3 50 [31][32] [33][34] 1.3.1 1.3.1.1 ATMOS PIPE ATMOS PIPE [35][36] ATMOS PIPE 1.3.1.2 Leak Net Leak Net [37][38] EFA 92 20 94 PPAMass Pack Smart Points System 1.6 160 1.3.1.3 Wavealert Wavealert [39][40] Acoustic Systems 5
Incorporated 1.3.2 80 90 1.3.2.1 [41] 1.6% 4 [42] 1% 2% 180 1.3.2.2 [43] 0.72% 2% 1.3.2.3 [44] 6
1.4 1-1 1.5 1.5.1 1.5.2 MATLAB 1 FLUENT 7
2 3 MATLAB 4 5 6 MATLAB 8