外文翻譯----降低汽車噪聲的方法-汽車設(shè)計-文庫吧在線文庫
【正文】 educe vehicle noise, engine noise, the engine could also be used to proactively support systems, to offset the engine vibration and noise. 降低汽車噪聲的方法 隨著汽車工業(yè)的迅猛發(fā)展，對車輛的舒適性 ,緩震性和噪聲有了越來越嚴(yán)格的要求。從結(jié)構(gòu)上可分為發(fā)動機（即燃燒噪聲），底盤噪聲（即動力傳動噪音，與噪聲有關(guān)的所有組件），電氣設(shè)備，噪聲（冷卻風(fēng)扇的噪音，汽車噪音發(fā)生器），車身噪音（如車身結(jié)構(gòu)，形狀和附件安裝不合理的噪音）。 對汽車噪音的評估與評價主要有，車 外的噪音和緩振性。機動車輛和車輛的振動和噪音的降低水平，經(jīng)濟性，可靠性及強度，剛度，質(zhì)量，生產(chǎn)成本和使用密切相關(guān)。顯然，通過共振幅度減少和加快自由振動衰減，減少了各部分的傳真能力，部分達(dá)到或超過臨界頻率的隔振能力增加。要結(jié)合空氣過濾器（即在空氣過濾器的附加諧振腔和吸聲材料，例如， R3238）已成為最有效的攝入量消聲器，消聲器的音量攝入量超過 20dBA。降低車身噪音主要有下面幾種方法：第一，盡量是車身呈流線型，實現(xiàn)平穩(wěn)過渡 。這建立在對消聲器技術(shù)的發(fā)展上，其原理是：在噪聲和振動的對立階段使用電子消聲系統(tǒng)，是其相互抵消，以降低噪音。胎面面積越大，產(chǎn)生的噪音也越大。 電子設(shè)備的噪音 （ 1） 風(fēng)扇冷卻噪音 風(fēng)扇冷卻設(shè)備的噪聲產(chǎn)生受風(fēng)力保持環(huán)，水泵，散熱器和傳動裝置的影響，但噪音的產(chǎn)生主要取決于底盤。柴油機增壓器噪聲主要是渦輪增壓器壓縮機進(jìn)氣噪音。此外，給發(fā)動機涂阻尼材料是一種有效的方法。 除了有限元法（ FEM）和邊界元法（ BEM），仿真技術(shù)已廣泛應(yīng)用。日本的法律和法規(guī)規(guī)定，在未來的 10 年小型車的噪音標(biāo)準(zhǔn)控制在 76dBA 以下。而且，所有的這些來自震動的噪聲，無疑的還能夠?qū)е履承┝慵脑缙谄趽p傷，從而減少了汽車的使用壽命；高分貝的噪聲還會損害駕駛員的聽覺使駕駛員在短時間內(nèi)感到駕駛疲勞，這樣就對安全駕駛就構(gòu)成了嚴(yán)重的威脅。s laws and regulations, small car in the next decade to control noise standards at the following 76dBA. A number of domestic cities are also planning to traffic trunk lines in 2020 to control noise at the average of less than 70dBA. According to the domestic current data indicate that the domestic value of bus noise permit shall not exceed 82dBA, light trucks for . This shows that our country in the vehicle noise control will have to make do. noise assessment noise evaluation mainly refers to the car, outside noise and vibration adaptive value. Evaluation methods can be divided into subjective evaluation and objective evaluation. Subjective assessment of the impact of vehicle noise is a major factor in fort, loudness and uncertainties, such as semantic differential method can be used for subjective evaluation. At an objective evaluation, can be used PCNM noise measuring device for measuring test analysis。 addition simulation technology in the finite element method (FEM) and boundary element method (BEM) has been widely applied. noise control noise generation and dissemination in accordance with the mechanism of noise control technology can be put into the following three categories: First, the control of noise sources, are two routes of transmission of noise control, noise three recipients are protected. One of the control of noise sources are the most fundamental, the most direct measures, including noise reduction to reduc
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