1. Reduce exhaust noise. Exhaust noise is the most important noise source of the unit, which is characterized by fast exhaust speed, high sound isolation level and great difficulty in control.

2. Reduce the noise of axial flow fan. Two problems must be considered in noise reduction of generator set cooling fan: noise reduction amount and pressure loss allowed by exhaust channel lock.

3. Sound insulation, sound absorption and vibration isolation of machine room

(1) Sound insulation in the machine room. The method adopted is to remove all the Windows except the observation room of the inner wall connected with the observation room. All the holes and holes should be tightly sealed. The sound insulation of the brick wall should be above 40dB. The doors and Windows of the machine room are fireproof and soundproof.

(2) Inlet wind and headwind. After sound insulation treatment in the machine room, ventilation and heat dissipation in the machine room should be solved. The air inlet shall be set on the same straight line with the generator set and the exhaust outlet. Air inlet should be equipped with an resistive piece muffler. As the air inlet pressure loss is also within the permissible range, the air flow in and out of the machine room can be naturally balanced, and the ventilation and heat dissipation effect is obvious.

(3) Silent treatment. The five walls outside the ground in the machine room can be used for sound absorption processing. According to the frequency spectrum characteristics of the generator set, perforated plate resonance sound absorption structure is adopted.

(4) The exchange of indoor air and sound insulation in the machine room will prevent the air convection in the room during the shutdown of the closed water-cooled generator set, and the high temperature in the room will not be lowered in time. The low-noise axial flow fan is equipped with an anti-chip muffler.

(5) Vibration isolation of unit. Before installation, the generator set should be isolated in strict accordance with the relevant data provided by the manufacturer.