With the rapid development of automobile industry, there 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 people's life, work and health. So noise control is not only related 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 fort are the three closely related, it is necessary to reduce vibration, reduce noise, but also improve 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 ic three parts. From the structure can be divided into the engine (ie, combustion noise), the chassis noise (ie, power train noise, 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 e a key automotive noise control.
In addition, automobile tires at high speed, it will also cause more noise. This is because of the tire at the ground flows, the pattern is located in the air by ground tank and re-extrusion process caused by inhaling gas pump sound, as we
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