Diesel generator set noise processing

Diesel generator set is running, usually a 95-110db (a) noise, diesel generator sets produce noise in the run-time around, it will cause serious harm to the environment. Then, the noise source can not be reduced which measures to control the diesel generator set noise?
Diesel generator set noise source
diesel generator Noise is a complex sound source constituted by a variety of sound sources. In accordance with the noise radiation, it can be divided into the aerodynamic noise, surface radiation and electromagnetic noise. Causes the surface radiated noise of diesel generator sets can be divided into the combustion noise and mechanical noise. Aerodynamic noise is the main noise source of the noise of the diesel engine group.
An aerodynamic noise diesel generator set noise is due to the non-stable process of the gas from the gas disturbances and gas and the interaction of objects. Aerodynamic noise radiation directly to the atmosphere, including the intake noise, exhaust noise, and cooling fan noise.
Electromagnetic noise is a diesel engine block noise from the generator rotor in the high-speed rotation of the electric and magnetic fields.
Combustion noise and mechanical noise is difficult to strictly distinguish between, usually due to pressure fluctuations in the formation of combustion in the diesel generator group cylinder through the cylinder head, piston, Lian Hin, crankshaft, body external radiation noise of the diesel engine known as the combustion noise. Piston cylinder liner impact and moving parts of mechanical shock and vibration generated by the diesel engine blocks noise that the mechanical noise. Direct injection diesel engine combustion noise is higher than the mechanical noise, instead of direct injection diesel engine mechanical noise is higher than the combustion noise. But the combustion noise at low speed than the mechanical noise.