外文翻譯----降低汽車噪聲的方法-汽車設計(已修改)
2025-06-01 11:19 本頁面
【正文】 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。s life, work and health. So noise control is not only related to fort, but also related to environmental protection. However, all also from the vibration noise, vibration can cause certain parts of the early fatigue damage, thereby reducing the service life of motor vehicles。 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。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 . Thi
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