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原文传递 Leak Detection by Acoustic Emission Monitoring. Phase 1. Feasibility Study

题名：	Leak Detection by Acoustic Emission Monitoring. Phase 1. Feasibility Study
作者：	Winder, A. A.;Lichtenstein, Bernard;
关键词：	PIPELINES, FUEL TANKS, AIR FORCE FACILITIES, MONITORS, LEAK DETECTORS, STORAGE TANKS, ACOUSTIC EMISSIONS, UNDERGROUND STRUCTURES, STRESSES, FREQUENCY, STATIONS, TRANSIENTS, AIR FORCE, PARAMETRIC ANALYSIS, AIRCRAFT, MONITORING, TRAFFIC, ACCELEROMETERS, DEFORMATION, PROBABILITY, ENERGY, RATES, ARRAYS, MOMENTS, WAVEGUIDES, SENSITIVITY, LIMITATIONS, SIGNALS, RELEASE, WALLS, ACOUSTICS, FLUIDS, NOISE, STORAGE, ANALYZERS, PUMPS, MOTORS, AUTOMATIC, CHANNELS, MASKING, FOURIER ANALYSIS, SPECTRUM ANALYZERS, MULTICHANNEL, UNDERGROUND, TREMORS.
摘要：	This investigation was conducted to determine the feasibility of detecting leaks from underground storage tanks or pipelines using acoustic emissions. An extensive technical literature review established that distinguishable acoustic emission signals will be generated when a storage tank is subjected to deformation stresses. A parametric analysis was performed which indicated that leak rates less than 0.1 gallons per hour can be detected for leak sizes less than 1/32 inch with 99%probability if the transient signals were sensed with an array of accelerometers (cemented to the tank or via acoustic waveguides), each having a sensitivity greater than 250 mv/g over a frequency range of 0.1 to 4000 Hz, and processed in a multi-channel Fourier spectrum analyzer with automatic threshold detection. An acoustic transient or energy release processor could conceivably detect the onset of the leak at the moment of fracture of the tank wall. The primary limitations to realizing reliable and robust acoustic emission monitoring of underground fluid leaks are the various masking noise sources prevalent at Air Force bases, which are attributed to aircraft, motor traffic, pump station operation, and ground tremors. Acoustic, Leak detection, Underground tank, Pipeline
总页数：	57
报告类型：	科技报告