A modeling method for detection of micro-leakage in gas pipelines based on acoustic signals
A gas transmission pipeline and signal detection technology, which is applied in the direction of detecting the appearance of fluid at the leakage point, pipeline system, measuring device, etc., can solve the problem of micro-leakage in gas transmission pipelines, avoid physical formulas, and solve the problem of leak point location Effect
Active Publication Date: 2018-10-12
重庆岱普科技有限责任公司
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[0005] This application solves the technical problem of identifying micro-leakage in gas pipelines with limited acoustic data by providing a modeling method for detecting micro-leakage in gas pipelines based on acoustic signals
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[0057] A modeling method for detecting micro-leakage in gas pipelines based on acoustic signals, such as figure 1 shown, including the following steps:
[0058]S1: Construct a positive pressure gas transmission pipeline system and collect micro-leakage acoustic signals. In the positive pressure gas transmission pipeline system, the compressor provides constant pressure gas, presses the constant pressure gas into the circular pipeline, and finally presses the constant pressure gas into the circular pipeline. In another compressor, the first microphone is placed at the leak point, and the second microphone is placed at the pipeline 1 meter away from the leak point, and the first microphone and the second microphone are used to collect sound wave signals, which include micro Leakage sound wave signal and non-leakage sound wave signal, the positive pressure gas transmission pipeline system also includes an air control valve to control the characteristics of the output gas and main...
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The invention provides a modeling method for detecting slight leakage of a gas pipeline based on a wave signal. The method comprises the steps of establishing a positive pressure gas pipeline system, collecting the sound wave signal of the slight leakage; conducting preprocessing on the collected sound wave signal, establishing the Gaussian distribution model of the sound wave signal of the slight leakage, judging whether the slight leakage occurs or not according to the Euclidean distance of the tested sound wave signal and the established Gaussian distribution distance. According to the modeling method for detecting the slight leakage of the gas pipeline based on the wave signal, under the condition of limited data, the signal of the slight leakage is recognized by establishing the Gaussian distribution model of the sound wave signal of the slight leakage, the recognition of the slight leakage of the positive pressure gas pipeline is benefited, the solving of the leakage point locating problem of the slight leakage of a pipeline is also benefited in future researches, abundant physical equations are avoided, and the method is practical.
Description
technical field [0001] The invention relates to the technical field of natural gas pipeline safety detection, in particular to a modeling method for detecting micro-leakage of gas transmission pipelines based on sound wave signals. Background technique [0002] Positive pressure gas pipelines are the most common components of manufacturing plants, but after a period of work, the pipelines are prone to leakage due to corrosion, oxidation, and human misoperation. In the early stage, there will be tiny cracks or holes in the pipeline. As time goes by, the tiny cracks and holes will evolve into large cracks, posing a greater safety hazard. At present, the common method is to install pressure and flow sensors on the pipeline and to patrol them regularly. Each sensor has a specific measurement range, making it difficult to accurately measure small leaks. Existing studies have given the definition of microleakage: the leakage flow fluctuation F is less than 1.2%F normal (F norm...
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IPC IPC(8): F17D5/00F17D5/06G01M3/24
CPCF17D5/005F17D5/06G01M3/243
Inventor 利节向毅陈国荣熊茜刘松高铮杜晓霞罗建伟
Owner 重庆岱普科技有限责任公司