摘要
本文给出了上海船研所空泡水筒的背景噪声和ITTC标准螺旋桨的噪声测量结果。对其噪声频谱分析结果表明,上海船研所空泡水筒的背景噪声很低,在500赫兹以上的频率范围,噪声信号可获得较高的信噪比;螺旋桨的流动噪声和各种类型空化噪声的频率范围则可达100千赫兹以上,在50千赫兹频率有较高的声压级。另外,水文对噪声测量系统和测试方法进行了讨论,並提出了一些建议。
This paper gives the measurement results of the background noise in SSSRI cavitation Tunnel and the cavitation noise of the ITTC standard propeller model. The analysis based on noise spectrum have indicaded that the background noise in SSSRI cavitation Tunnel is rather lower, the higher signal-to-noise ratio can be obtained in the range of frequency about 500 Hz, the frequency range of propeller flow noise and the noise caused by various cavitation types can reach about 100 KHz, and there is still a higher SPL at 50 KHz. In addition, the noise measurement system and method are discussed in the paper and some suggestions are given.
