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3, the combustion noise: combustion noise is diesel fuel in the combustion process of structure vibration and noise.Within the cylinder combustion noise sound pressure level is very high, however, most of the parts in the engine structure rigidity is higher, its natural frequency of vibration in the high frequency region, because of sonic frequency response mismatch, because of high cylinder pressure level in low frequency peak comes not smoothly, and the high frequency of cylinder pressure level is relatively easy to spread.
Unit 4, cooling fan and the exhaust noise, fan noise is composed of eddy current and rotation noise, rotating noise generated by the fan blade cutting air flow caused by the periodic disturbance;Eddy current noise is generated when the flow separation on the blade section of, caused by the viscosity of the gas vortex flow, radiation an unsteady flow noise.Exhaust noise, air flow noise, fan noise, mechanical noise are out through the exhaust channel radiation.Cummins 240kw diesel generator set price
