And at the same time , automobile noise pollution has been severer than before 汽車工業(yè)發(fā)展迅速,使得汽車噪聲污染日益嚴重。
The reduction of exhaust system noise is the key to the reduction of automobile noise . at present , the main method to reduce exhaust noise is by setting muffler in automobile exhaust system 減小排氣噪聲是降低汽車噪聲的關鍵,目前在排氣系統(tǒng)中安裝排氣消聲器是減少排氣噪聲的主要方法。
Automobile noise is the pollution problem that need be solved urgently in our country . reducing the noise of automobile not only is beneficial to environment , but also avails to people health and improving the standard of living 汽車噪聲是我國目前亟待解決的噪聲污染問題,降低汽車噪聲不僅有利于環(huán)境保護,而且有益于人們的身體健康和生活質(zhì)量的提高。
In this paper , it analyzes the mechanism of automobile noise polytechnic and routes of noise propagation , expoundes the research of active control and passive control of the vibration and noise reduction control technology of automobile . then it puts forward the means of automobile noise reduction in practical application 從汽車噪聲的產(chǎn)生機理入手,分析了噪聲傳播的途徑,從主動控制與被動控制兩方面對汽車減振降噪技術進行了研究,介紹了實際應用的降噪方法
Expressway is a result of socilal development . its appearance brings about a series of problems , such as the destruction of ecosystem environment along the expressway , heavy pollution from automobile noise and tail gas ; therefore , it is necessary to highly consider and strength ecosystem engineering disign , environmental protection and recovery , and greening along the expressway 高速公路是社會發(fā)展的產(chǎn)物,路域范圍內(nèi)的自然生態(tài)環(huán)境遭到了破壞,汽車噪音、汽車尾氣對環(huán)境的污染日益加劇,因此要加強公路建設中的生態(tài)工程設計,對沿線的生態(tài)環(huán)境的保護、恢復以及綠化方面的要求提高。