Extraction And Analysis Of Noise Signal Generated By High-pressure Water Jets Impacting Target Based On Matlab

High Pressure Water Jet has been widely used in coal,petroleum,chemicals and so on , and as the only means of cold cutting, high pressure water jet is especially suited for the flammable explosive environment。Especially in military applications, it has carried out a lot of related research such as the destruction of discarded shells and mines. Sound recognition technique is also widely used in modern military, such as tanks, submarines, aircraft recognition and so on. The thesis combine the high pressure water jet technology with the voice recognition technology,carried out preliminary research on identify mines by sound recognition technique.Now it have been a lot of mine-detection technology ,for example by metal,Infrared Image,the chemical analyzing, automatic detection, acoustic sounding , radar observation, nuclear quadruple resonance and so on. The thesis carried out the research about identify target using the voice produced by high pressure water jet impact on recognition targets (mines), is the extension and expansion of the research about high pressure water jet cutting the target (mine) . The study has opened up new application channels for the high-pressure water jet technology,as well as provides a useful attempt for detection and destruction mine coherently used of high pressure water jet technology.The thesis has mainly done the following job in several aspects: analyzed recent research or the mine detection, high pressure water jet and sound distinguish both at home and abroad; described the basic principles of high pressure water jet and sound recognition; Based on the technologies of sound intensity measurement and computer interface,this dissertation made a hardware sys1em and a corresponding measurement software for sound signal acquisition, and completed noise acquisition procedure; Disposing noise and extracting feature of signals are carried on through using wavelet transform technique.The results show that we can make preliminary judge through the voice signal on the target (mine) according to the experimental methods and signal analysis methods designed by this thesis.If we continuing to enrich and improve the research methods and means, the voice recognition technology base on high pressure water jet can be used actually.