low-noise propeller 低噪声推进器
To predict the noise of the warship propeller is significant for estimating the propeller's acoustical performance and designing low noise propeller.
螺旋桨噪声的预报对评价螺旋桨声学性能及螺旋桨声学设计有非常重要的意义。
With a low-pitched rumbling noise, the propeller began to rotate.
随着低沉的隆隆声，螺旋桨开始旋转起来。
According to mechanism of low frequency broadband noise of the propeller, theoretical analysis method is given and numerical calculation of the noise is carried out as well.
在分析螺旋桨低频宽带噪声成因的基础上得到了理论计算方法，并作了数值计算。
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