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In this paper, the national \Acoustic emission testing is a dynamic , passive non-destructive testing techniques , the acoustic emission signal changes over time between the same component damage evolution with a particular relationship , can track changes reflect defects , and thus the component safety warning . The high cost of marine structures , harsh environment , and once the damage occurs , the consequences immeasurable , there is an urgent need for a technology capable of real-time monitoring of their health , and provide timely and effective early warning . AE technology successfully used in marine structures , the benefits are enormous . This article through laboratory experiments carried out a study of the application of acoustic emission warning technology include the following aspects : ( 1) the destruction of the metal components of acoustic emission monitoring test . A number of acoustic emission monitoring experimental program designed to prepare high ductile metal specimens under the existing experimental conditions , the acoustic emission monitoring experiment conducted the metal tensile fracture and fatigue cracking . (2) the metal components injuries acoustic emission signal analysis and processing . Tensile fracture experiments on the rod , sheet tensile fracture experiments , the bar fatigue cracking experimental acoustic emission monitoring results for parameters analysis , results show that acoustic emission parameters ( ringing , energy , amplitude , rise time , duration , etc.) can be directly characterization specimen injury , specimen type of injury , and get some important laws on acoustic emission parameters ; waveform processing method (FFT transform , time-frequency analysis , wavelet transform , the bispectrum ) extract critical damage points acoustic emission signal characteristics found the above waveform processing method can better distinction specimen type of injury . (3) the marine structural acoustic emission the warning technology applications research . On the basis of the above analysis , the research status at home and abroad failure criteria based on acoustic emission parameters , acoustic emission applied to metal components warning to develop early warning indicators ; final problem for sensor mounting arrangement and signal transmission the initial program proposed marine structural acoustic emission warning technology applications .
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