On the relation between tonal and broadband content of hull pressure spectra due to cavitating ship propellers

9th International Symposium on Cavitation

Bosschers, J.^1

MARIN, Haagsteeg 2, Wageningen

6700 AA, Netherlands^1

关键词: Blade passage;    Blade passage frequency;    Cavitating;    Cavitating propellers;    Frequency domains;    Phase angles;    Pressure fluctuation;    Pressure spectrum;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012101/pdf
DOI  :  10.1088/1742-6596/656/1/012101

来源: IOP

【 摘 要 】

Cavitating propellers generate pressure fluctuations on the hull of the ship. These pressure fluctuations are usually analyzed in the frequency domain using FFTs and the spectrum is composed of tonals at multiples of the blade passage frequency and a broadband part. The two are often considered separately but a relation between the two exists which has been investigated by theoretical signal analysis. It will be shown that the broadband part is related to the variability of the signal between blade passages and a simple procedure is proposed to quantify the variability in terms of amplitude and phase angle. The procedure has been applied to a data set obtained at sea trials.