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。
2
Sound absorption and insulation is the acoustical characteristic of material. Measurement of sound absorption and insulation has an important significance in noise control and acoustical design.
吸声与隔声是材料的声学特性，吸声与隔声测量对噪声控制与声学设计具有重要意义。
3
According to air horn design theory, JQF low noise air horn device with partial acoustical enclosure has been designed.