4 wheel carrier

The explanation of this 4 wheel carrier is given from the perspective of theoretical calculation. The total noise after the synthesis of two noise sources with sound levels of 90dB (noise source A) and 80dB (noise source B) is 90.41dB. If measures are taken to make the main noise If source A is reduced by 5dB from 90dB, the total noise will be reduced to 86.19dB

. If measures are taken to reduce the secondary noise source B by 5 dB from 80 dB, the total noise will be reduced to 90.14 dB, which has no obvious effect. The same is reduced by 5dB, and the effect is completely different. Therefore, motorcycle noise reduction is mainly to determine the main noise source through testing and analysis, and then take effective noise reduction measures to solve it, it is possible to avoid blindness and limitations and achieve the desired effect.

Sound intensity measurement technology has been developed rapidly since the early 1980s. It is different from the commonly used sound level meter to measure the sound pressure level. It does not require high test environment and is suitable for on-site measurement. At the same time, it has strong adaptability and is suitable for Identifying noise sources has become increasingly widely used.

Therefore, the oil must be proportioned strictly. At the same time, pay attention to the mixing method. Gasoline and engine oil should be mixed evenly and thoroughly in the container before adding it to the fuel tank. Do not mix directly in the fuel tank. In addition, it should be noted that the impurities in the oil should be filtered. The gasoline that has been cleaned cannot be used. The low-octane gasoline cannot be used after long-term storage. The container that has been filled with kerosene and diesel cannot be directly filled with gasoline.

 

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