分析了液压噪声产生的各种机理及危害性，针对液压系统的使用特点，提出控制方法，减轻液压噪声对环境、对人体、对液压系统的危害性。
Analyse the reason and harm of hydraulic noise; put forward the controlling method to reduce the harm to environment, health according to the characteristic of hydraulic system.
介绍噪声的特征、危害性和交通车辆噪声，包括汽车排气噪声、发动机噪声、轮胎噪声和喇叭噪声等。
The features and harmfulness of noises including the traffic noises produced by engine exhaust, tyre, horn, etc.
本文深入分析了震源车的振动、噪声产生的根源及其危害性，初步探讨了一些降低噪声及振动的措施。
This article analyzes the source and damage of the noise and vibrating of vibra-tor. It also proposes some measures to reduce noise and vibrating.
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