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2, mechanical noise, mechanical noise is the main engine's moving parts in the process of running by the gas pressure and inertia force caused by the periodic change of the vibration or impact each other, one of the most serious has the following kinds: piston crank connecting rod mechanism of the noise, the noise, the noise of the transmission gear of valve-train, unbalanced inertia force caused by the mechanical vibration and noise.Diesel generator set strong mechanical shock can be spread over a long distance outside of soil, and then through the ground radiation noise.This structure far, failure to reduce noise propagation, once the form is difficult to isolate.
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