A study of negative pressure wave method based on Haar wavelet transform in ship piping leakage detection system

According to build the transient leakage models of the ship piping and research about the mechanism of negative pressure wave, the author gets the method of the ship piping leakage detection by combining with flow balance method. The frequently-used leakage detection of negative pressure wave, because the original signal has lots of noises and the frequent adjustable pump or the reset valve of ship pipeline will produce negative pressure wave, may easily fail to report or even misreport. In order to monitor the leakage of the ship piping, the author analyzes the negative pressure wave signal by Haar wavelet transform which can effectively detect mutations in the signal and overcome an error which caused by the noises in the location.