外文翻譯----降低汽車噪聲的方法-汽車設(shè)計(jì)-文庫吧
2025-04-17 11:19 本頁面
【正文】 s 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 reduce the exciting force and the engine parts of the exciting force response, which means transformation of acoustic source local oscillator. However, it is difficult to control noise sources when necessary in the route of transmission of noise to take measures, such as sound absorption, sound insulation, noise reduction, vibration and vibration isolation measures. Motor vehicles and vehicle vibration and noise reduction level of power, economy, reliability and strength, stiffness, quality, manufacturing costs and use are closely related. engine to reduce vibration and noise of the engine noise is the focus of automotive noise control. Engine vibration and noise are generated at source. Engine noise is from fuel bustion, valve bodies, gears and piston timing noise percussion synthesis. (1) ontology engine noise Lower engine noise will be ontological transformation of local oscillator sound sources, including methods such as finite element method analysis and design engines, selection of soft bustion process, improve the structure of the body stiffness, with the use of tight space, reduce noise cylinder cover. In addition, give the engine Tu damping material is an effective approach. Damping materials can kiic energy into thermal energy. To deal with the principle of damping is a damping
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