噪声对水跃区脉动压力的影响及处理方法

在模型试验中，由于各种噪声的存在，常使水跃区脉动压力信号产生畸变，需要一定的处理方法来还原真实信号．为此，应用信号分解和自适应滤波方法对水跃区脉动压力信号进行研究和处理．结果表明，水跃区脉动压力信号包括真实信号和噪声2部分，而噪声一般包括背景噪声、电噪声和传感器振动所产生的附加脉动压力噪声3个部分，其中附加脉动压力噪声不可忽略．自适应滤波可以有效地滤除附加脉动压力噪声使信号得到很好的还原．该方法和结果为脉动压力模型试验布置、测试及数据处理提供了有益的技术参考．

Noise Effect and Reduction Method of Pressure Fluctuation in Hydraulic Jump

In model test,due to the existence of various noises the pressure fluctuating measured under the region of hydraulic jump is often distorted,and some methods are needed to recover the signal. The methods of signal decomposition and adaptive filtering were used to analyze and denoise the pressure fluctuation in hydraulic jump. The results indicate that the signal measured is contaminated by noise which includes three components, such as acoustic background noise,electronic noise and vibration-induced pressure fluctuation noise. The pressure fluctuation noise unfortunately cannot be ignored in some cases. The adaptive filtering can denoise the signal and recover it significantly. The proposed method arid its results offer an exercisable technique scheme for experimental installation,testing and data processing.