排放噪声 meaning in English
displacement noise
displacement nose
Examples
- Measurement of noise emitted by stationary road vehicles
道路车辆停车排放噪声的试验方法 - Mire acoustics - determination of sound immission from sound sources placed closed to the ear - part 1 : technique using a microphone in a real ear mire technique
声学.置于耳边的噪声源排放噪声的测定.真耳中使用传声器的技术 - The porous diffusion type silencer is widely used to reduce the air flow noise because of its small volume and high noise attenuating ability . the out case of the silencer plays a very important role in reducing noise . the effect of the hole ' s shape , diameter and the distance between neighboring holes as well as the matchup between the case and the sound absorbing material tube are investigated experimentally . the relation between the out - flow noise and the gas velocity distribution is carefully studied for two different kinds of matchup between the case and the sound absorbing material tube . some useful results are gotten , which may be valuable to the design of the silencer
多孔扩散型消声器由于其体积小、消声性能高而广泛应用到排气噪声的降低上，其外壳对消声器的消声性能具有重要作用.本文对此类消声器外壳的孔型、孔径和孔距以及外壳同消声材料的配合方面进行了细致的实验研究，特别对外壳与消声材料的配合与其排放噪声以及外部流场之间的关系进行了探讨，得到了一些有用的结论，对消声器性能的提高具有一定指导意义。