螺旋桨诱导船体表面脉动压力的STFT谱研究

STFT Study on Propeller-induced Fluctuation Pressure on Ship Surface

文中结合模型试验中三种典型螺旋桨空化状态下的脉动压力信号STFT谱,分析了螺旋桨诱导船底表面脉动压力的时频特征分布.结果表明:STFT谱对于螺旋桨诱导船底表面脉动压力的时域谱、线谱和非平稳脉动的分析是十分有效的,可以同时提供螺旋桨诱导脉动压力时域与频域的丰富信息,能够在非平稳脉动压力信号的处理分析中发挥重要作用.

Combined with STFT spectra of fluctuating pressure signals of three typical propellers in cavitation state in model test, the time-frequency characteristic distribution of fluctuating pressure on bottom surface induced by propellers was analyzed. The results show that STFT spectrum is very effective for the analysis of time domain spectrum, line spectrum and non-stationary pulsation of propeller-induced fluctuating pressure on the bottom surface of ship. It can provide abundant information of propeller-induced fluctuating pressure in time domain and frequency domain at the same time, and can play an important role in the processing and analysis of non-stationary fluctuating pressure signals.