外文翻譯----降低汽車噪聲的方法-汽車設計-展示頁
2025-05-27 11:19本頁面
【正文】 he most effective intake muffler, muffler volume of more than 20dBA. Chassis Noise (1) Department of exhaust noise Department of the chassis exhaust noise is the main noise sources, mainly from the exhaust pressure pulsation noise, air flow through the valve seat when issued by eddy current noise, because of boundary layer airflow disturbance caused by noise and exhaust Office jet noise position. (2) power train noise Powertrain noise from the vibration caused by change gear meshing and rotating shaft vibration. General measures taken are: First, choose lownoise transmission, engine and gearbox are two and the main reducer, such as rear axle and chassis ponents for flexible rubber pad connections, so as to achieve the purpose of isolation。 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。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 fro
畢業(yè)設計相關推薦
鄂ICP備17016276號-1