| Compared with oil and coal,the use of natural gas as a clean and efficient energy is also increasing.Since the situation in Russia and Ukraine has changed greatly,the natural gas energy has become even more tense.However,the safety of pipeline transportation is extremely important.In view of the shortcomings of real-time and fast and accurate positioning of gas transmission pipeline leakage monitoring,the text has designed a set of gas transmission pipeline leakage monitoring and positioning system for this research.Combined with sensor technology,wireless communication technology,cloud server technology,host computer technology,variational mode algorithm and time delay estimation positioning algorithm,it has realized remote real-time monitoring of gas transmission pipeline,and completed fast and accurate leak location based on leakage acoustic signal.The main research contents of this paper are as follows:First of all,a set of pipeline leakage monitoring hardware system was designed.Relevant sensors were selected to collect the concentration,temperature,humidity and vibration signals of natural gas around the pipeline.It was transmitted through NB-IOT’s emerging wireless communication technology,and Tencent Cloud Platform was developed and created.At the same time,for more intuitive real-time viewing of pipeline status information,a host computer remote monitoring platform was developed using visual studio 2017 development software based on C # language,It also provides over threshold alarm and GPS equipment positioning functions.At the same time,according to the latest Tencent Lianlian technology developed by Tencent Cloud,the mobile We Chat applet was developed interactively on the basis of the technology,and the hardware platform was built,and then the function test was carried out in the laboratory environment.Finally,based on Matlab simulation tool,the research on noise removal and location of pipeline acoustic signal is completed.To solve the problem that VMD cannot determine the number of decomposed modal components IMF and penalty factor,sparrow search and particle swarm optimization algorithms are used to compare their parameters.The simulation results show that sparrow search algorithm has better optimization effect,and the decomposition is conducted according to the optimal parameter combination settings,Then the correlation coefficient method is used to filter and reconstruct the effective components.In order to reflect the denoising effect of this method,the denoising effect is compared with that of wavelet threshold denoising and EMD method on three different evaluation indicators: SNR,mean square error RMSE and correlation coefficient RC.Finally,the concept of time delay estimation is introduced into the location of pipeline leakage points,The SNR is set at 30,10 and-5 respectively to simulate and compare the anti noise and positioning performance of four different weighted time delay estimation methods.The experimental function test and simulation verify that the system designed in this paper can complete the real-time collection and monitoring of pipeline status information,and can timely alarm and GPS positioning in case of abnormalities.At the same time,the VMD denoising and generalized cross-correlation time delay estimation positioning methods based on sparrow search optimization and combining with correlation coefficient proposed in this paper for leakage acoustic signals can effectively improve the positioning accuracy,The real-time monitoring and rapid positioning of the pipeline are realized comprehensively,which reduces the economic losses and ensures the safe operation of the gas transmission pipeline.Figure [91] Table [9] Reference [70]... |
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