【正文】 常先進(jìn)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(dòng)機(jī)噪音，引擎也可以主動(dòng)支持系統(tǒng)，以抵消發(fā)動(dòng)機(jī)的振動(dòng)和噪音。一般采取的措施是：第一，選擇低噪聲傳輸，發(fā)動(dòng)機(jī)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(dá)到緩震得目的；第二，三軸轉(zhuǎn)動(dòng)控制平衡度，以減少扭轉(zhuǎn)震動(dòng)。 （ 1） 發(fā)動(dòng)機(jī)自身噪音 降低發(fā)動(dòng)機(jī)噪音，將發(fā)動(dòng)機(jī)機(jī)體轉(zhuǎn)變?yōu)楸镜卣袷幤鞯穆曉?，包括諸如微分分析法和發(fā)動(dòng)機(jī)的設(shè)計(jì)，選擇輕柔燃燒，提高發(fā)動(dòng)機(jī)的剛度及改善并使用緊湊的空間結(jié)構(gòu)，降低缸蓋噪音。 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(jì)末進(jìn)一步降低至 71dBA。 excessive noise can damage hearing the driver will enable the rapid driver fatigue, thus driving security constitutes a grave threat. So noise control, is also related to motor vehicle durability and safety. Thus vibration, noise and fort are the three closely related, it is necessary to reduce vibration, reduce noise, but also improve ride fort, and ensure the product economy, vehicle noise control in the standard range. One type of noise arising from car noise are the main factors of air power, mechanical drive, the electromagic three parts. From the structure can be divided into the engine (ie, bustion noise), the chassis noise (ie, power train noise, all ponents connected with the noise), electrical equipment, noise (cooling fan noise, car noise generator), body noise (such as body structure, shape and attachment installation unreasonable noise). One of the engine noise accounted for more than half of motor vehicle noise, including noise and body intake noise (such as engine vibration, the rotational axis Valve, Jin, door switches, such as exhaust noise). Therefore the engine vibration, noise reduction has bee a key automotive noise control. noise requirements of regulations in Europe, from October 1996 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。因此振動(dòng)，噪聲和舒適性三方面是密切相關(guān)的，既要減少振動(dòng)，降低噪音，而且還要提高乘坐舒適性，保證產(chǎn)品經(jīng)濟(jì)性，使車輛的噪音控制在標(biāo) 準(zhǔn)范圍內(nèi)。對(duì)噪聲源的控制是最根本，最直接的措施，包括降低噪音，減少振動(dòng)影響力和振動(dòng)的響應(yīng)，這意味著聲源轉(zhuǎn)化為局部振蕩器。在這方面，最有效的方法是攝入消聲器的使用。用更柔韌橡膠作為輪胎原理，可以進(jìn)一步降低輪胎產(chǎn)生的噪音。噪聲水平取決于發(fā)電機(jī)磁場(chǎng)結(jié)構(gòu)和通風(fēng)系統(tǒng)，以及發(fā)電 機(jī)的制造精密性和裝配情況。阻尼處理的方法是阻尼材料和其組成部分的振動(dòng)能量消耗。國內(nèi)目前的數(shù)據(jù)規(guī)定，巴士的噪音不得高于 ，輕卡的噪音不得高于 82dBA。 are threeaxis rotational control balance degrees, to reduce torsional vibration. Electric equipment noise (1) cooling fan noise Cooling fan noise happened devices are subject to wind retaining ring, water pump, radiator and transmission, but the noise generated depends primarily on the chassis. (2) automobile generator noise Automotive generator noise depends on the effects of a