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Usually engines are equipped with an air filter, intake noise can have greater attenuation, becomes a secondary source. And when the other sound source to obtain further control, the intake noise may become a major source of the sound, then the need to consider a good performance intake silencer, usually intake silencer and air filter for a combination of integrated design, both to meet the intake and filtration requirements, but also make the intake noise is effectively controlled.

2, the exhaust noise control:

  Control exhaust noise is the most effective way to install an exhaust muffler, the reality is often the noise reduction effect is not very satisfactory. The main reason is that the analysis is not reasonable muffler design and processing problems, the latter problem can be improved by increasing the level of technology; previous question involves muffler design ideas. The main rule of thumb is usually muffler design, some design calculation program under ideal conditions, assumptions, and these assumptions in the actual greatest impact is to ignore the existence of the gas stream, and the presence of high-pressure, high-temperature, high-speed pulsating air flow. Airflow in such a state will affect the sound field distribution inside the muffler, sound velocity, propagation of sound, etc., especially the airflow velocity greater impact. The main reason airstream muffler performance is the speed of the engine exhaust pulsation flow noise, followed by pipe, casing, partitions and other acoustic elements such airflow will impact the muffler, which in turn stimulate the vibration radiated noise. When the muffler structure parameters properly, or the structure is irrational, there is a problem or process, will result in muffler performance degradation, while too high flow velocity will increase the pressure loss can also cause muffler muffler performance.

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