船舶管路泄漏时信号组成分析及预处理研究

Research on Signal Composition Analysis and Preprocessing When Ship Pipeline Leakage

对船舶液体管路泄漏时的信号组成方式在理论上进行了探讨,包括高斯白噪声、脉冲噪声、压力脉动、风、浪、碰撞等带来的压力波动等.介绍了信号的处理方式,包括用中位数滤波法去除信号中的高斯白噪声和脉冲噪声以及用时间序列转折突变点的方法,寻找突变点将方波噪声从负压波信号中进行分离.并用这些方法对模拟的信号进行处理,得到了负压波检测方法所需的有用信号.

At first the signal composition under complex environment is analyzed when ship pipeline leakage occur.Then the signal processing methods are introduced,including by median filter to remove Gaussian noise and impulse noise,and separate square wave noise from the negative pressure wave signal by detecting mutation point of a time series.Finally,after using these methods to deal with actual signal,the useful signal which negative pressure wave detection method needs is obtained,which provide an effective basis for positioning leakage.