外文翻譯----降低汽車噪聲的方法-汽車設(shè)計(存儲版)
【正文】 96 onwards, the external bus 77dBA noise must be reduced to 74dBA, noise was reduced by half energy, the end of the century further reduced to 71dBA. Japan39。因此，對噪聲的控制，不僅關(guān)系到人類生活的舒適性，而且與環(huán)保有關(guān)。 歐洲噪聲法規(guī)要求從 1996年 10月起，巴士噪音必須由 77dBA減少到 74dBA，噪音制造能力減少一半，在本世紀末進一步降低至 71dBA。在客觀評價方面，可以用 PCNM噪聲測量計檢測分析設(shè)備 。 （ 1） 發(fā)動機自身噪音 降低發(fā)動機噪音，將發(fā)動機機體轉(zhuǎn)變?yōu)楸镜卣袷幤鞯穆曉矗ㄖT如微分分析法和發(fā)動機的設(shè)計，選擇輕柔燃燒，提高發(fā)動機的剛度及改善并使用緊湊的空間結(jié)構(gòu)，降低缸蓋噪音。非增壓發(fā)動機進氣噪音的主要組成部分，包括周期性壓力波動噪聲，渦流噪聲，氣缸的 Helmholtz 共振噪 聲。一般采取的措施是：第一，選擇低噪聲傳輸，發(fā)動機和變速箱是減低噪音的主要方面，如后軸和柔韌性很好的橡膠墊連接底盤部分，以達到緩震得目的；第二，三軸轉(zhuǎn)動控制平衡度，以減少扭轉(zhuǎn)震動。 此外，在高速時，汽車輪胎也是噪聲源。這種消聲器設(shè)備用了非常先進的電子元件，具有良好的降噪效果，可以用來減少車輛噪音，發(fā)動機噪音，引擎也可以主動支持系統(tǒng)，以抵消發(fā)動機的振動和噪音。第二，車身與框架組件采取平滑連接 。 機箱噪音 （ 1） 排氣系統(tǒng)噪聲 底盤的排氣系統(tǒng)噪聲是主要噪聲源，主要由排氣壓力形成的脈動噪聲，閥座氣流由于邊界層氣流的干擾當渦流通過時發(fā)出的噪音和廢氣再循環(huán)噴氣噪 聲組成。 目前，一些國家的專家設(shè)計了發(fā)動機主動隔振系統(tǒng)，以減少發(fā)動機振動，以達到降噪的目的。 汽車噪聲控制的重點是減少發(fā)動機的振動和噪音。評價方法可分為主觀評價和客觀評價。發(fā)動機的噪音占汽車噪音的一半以上，包括發(fā)動機運行噪聲和車身風口噪聲（如發(fā)動機振動，曲軸轉(zhuǎn)動，進，排 氣門，排氣噪聲）。據(jù)有關(guān)資料顯示，城市噪聲的百分之七十交通噪聲，交通噪聲主要是汽車的噪音。Ways to reduce vehicle noise With the rapid development of automobile industry, there is fort and vehicle vibration and noise control of more and more stringent requirements. According to relevant data shows that 70 percent of the city noise from the traffic noise, and traffic noise is mainly car noise. It is seriously polluting the urban environment, affecting people39。 third， interior is softened, such as Inner Mongolia at the roof and body skin the use of soundabsorbing material. In addition, the car at high speed when the tire is also a source of noise. Tire Tread greater, then the greater the noise. In addition, the tire tread with the noise generated also have a great relationship, there is a reasonable choice of the pattern of steel cord for radial tires to reduce tire noise are an effective way. Materials for the tire, the use of more flexible and soft rubber with high, you can create a lownoise tires. Other measures Automobile noise control, except in the design on the use of optimization methods and optimization of selected ponents, it can also carry out active control of noise. This is based on sound muffler technology, the principle is: the use of electronic muffler system with the opposite phase of the acoustic noise, vibration so that the two cancel each other out in order to reduce the noise. This muffler device used extremely advanced electronic ponents, has excellent noise reduction effect can be used to r
畢業(yè)設(shè)計相關(guān)推薦
鄂ICP備17016276號-1