螺旋桨空泡诱导的脉动压力信号处理方法  

Processing of Pulsating Pressure Signal Induced by Propeller Cavitation

作　　者：路悦欣 刘英良 周祎隆[3] 季盛[1,2] LU Yuexin;LIU Yingliang;ZHOU Yilong;JI Sheng(State Key Laboratory of Maritime Technology and Safety,Shanghai Ship and Shipping Research Institute Co.,Ltd.,Shanghai 200135,China;Key Laboratory of Marine Technology Ministry of Communications,Shanghai Ship and Shipping Research Institute Co.,Ltd.,Shanghai 200135,China;Marine Design and Research Institute of China,Shanghai 200011,China)

机构地区：[1]上海船舶运输科学研究所有限公司水路交通控制全国重点实验室,上海200135 [2]上海船舶运输科学研究所有限公司航运技术交通行业重点实验室,上海200135 [3]中国船舶及海洋工程设计研究院,上海200011

出　　处：《上海船舶运输科学研究所学报》2024年第4期1-10,共10页Journal of Shanghai Ship and Shipping Research Institute

摘　　要：在空泡脉动压力试验中,通常先对不稳定空泡进行通气处理,确认空泡稳定之后再进行数据采集和处理,这会使模型尺度与实尺度空泡的形态、稳定性和脉动压力的时域特征产生差异,从而影响空泡脉动压力的预报精度。由此,开展脉动压力信号处理方法研究,降低空泡稳定性差异对脉动压力预报结果的影响。分别采用直接对压力时域信号进行快速傅里叶变换(Fast Fourier Transform, FFT)、对脉动压力信号进行时域平均之后做傅里叶变换(时域平均FFT)和对脉动压力信号进行傅里叶变换之后做频域平均(FFT频域平均)等3种方法对稳定和不稳定空泡诱导的脉动压力信号进行处理和分析,结果表明:对于稳定空泡,相比直接FFT方法,时域平均FFT方法和FFT频域平均方法能消除随机因素的干扰,2种方法的预报结果一致;对于不稳定空泡,时域平均FFT方法不再适用,FFT频域平均方法能较为准确地预报脉动压力幅值。In propeller cavitation pulsation pressure testing,the stability of cavitation significantly affects the time domain characteristics of the induced pulsation pressure.This stability also determines the accuracy of predicted cavitation pulsation pressure.Three processing methods are compared:ordinary FFT(Fast Fourier Transform);averaging the signal in the time domain before Fourier transform(Time-domain averaged FFT);averaging the signal in the frequency domain after Fourier transform(Frequency-domain averaged FFT).The calculations were conducted to analyze the pulse pressure signals induced by stable and unstable vacuoles.The results indicate that the Time-domain averaged FFT and the Frequency-domain averaged FFT can eliminate the interference of random factors and produce consistent prediction results when compared to the direct FFT method.However,the Time-domain averaged FFT method is not applicable for unstable cavitation.In that case,the Frequency-domain averaged FFT method can more accurately predict the pulse pressure amplitude.

关 键 词：螺旋桨 空泡脉动压力 信号处理方法 

分 类 号：U661.313[交通运输工程—船舶及航道工程]