分析了石化企业中常见的排气放空噪声的原理及其影响因素，探讨了排气放空消声器的设计方法及技术要点。
This paper analyzed the causes and influence factors of the jet noise emerged from petroleum and chemical plants, and investigated design methods and main technique cruces of exhaust mufflers.
通过对通讯车辆噪声和振动特性的分析，介绍了在该车上进行的振动和噪声改进对比试验的试验方法及试验原理；
Through an analysis of noise and vibration characteristics, an experimental principle and method is introduced to eliminate the noise and vibration in communication automobiles.
本文对驻极体电容传声器的原理及噪声作了分析，这将有助于提高它的电特性。
The principle of electret condenser microphone and its noise are analyzed in the paper. It will be helpful to improve the electric specification.
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