What are the good methods for sound insulation and noise reduction of diesel generators

The most fundamental way to reduce generator noise is to start from the sound source and use some conventional noise reduction technologies; such as mufflers, sound insulation, sound absorption, vibration isolation, etc. are the most effective methods.

1. Reduce exhaust noise. Exhaust noise is the main noise source of the unit. It is characterized by high noise level, fast exhaust speed, and difficult management. Using a special impedance type composite muffler can generally reduce the exhaust noise by 40-60dba.

2. Reduce the noise of axial flow fans. When reducing the noise of the cooling fan of the generator set, two issues must be considered. One is the allowable pressure loss in the exhaust channel. The second is the required amount of noise reduction. For the above two points, resistive chip mufflers can be used.

3. Sound insulation and sound absorption treatment of the computer room and vibration isolation of the unit

(1) Sound insulation of the computer room. After the exhaust noise and cooling fan noise of the unit are reduced, the main remaining noise sources are diesel engine mechanical noise and combustion noise. The method adopted is to remove all windows except the necessary interior wall observation windows connected to the observation room, all holes and holes must be tightly sealed, and the sound insulation of the brick wall must be above 40dba. The computer room doors and windows adopt fireproof and soundproof doors and windows.

(2), air intake and exhaust. After the sound insulation treatment of the computer room, the ventilation and heat dissipation problem in the computer room must be solved. The air inlet should be set on the same straight line as the generator set and air exhaust outlet. The air inlet should be equipped with a resistive piece muffler. Since the pressure loss at the air inlet is also within the allowable range, the air volume in and out of the machine room can be naturally balanced, and the ventilation and heat dissipation effect is obvious.

(3) Sound absorption treatment. The five walls in the machine room except the ground can be treated with sound absorption. According to the spectral characteristics of the generator set, a perforated plate resonance sound absorption structure is adopted.

(4) The exchange of indoor air and the good sound insulation of the machine room will prevent the air in the room from convection when the closed water-cooled generator is shut down, and the high temperature in the room cannot be lowered in time. Low-noise axial flow fans can be used , coupled with a resistive chip muffler can solve the problem.

(5) Vibration isolation of the unit. Before the generator set is installed, vibration isolation treatment should be carried out strictly in accordance with the relevant information provided by the manufacturer to avoid long-distance transmission of structural sound, and continuous radiation of air sound during the propagation, making it impossible to achieve the factory boundary noise level. For existing generating units that require treatment due to exceeding standards, the vibration conditions on the ground near the unit must be measured. If the vibration is obvious, the generating unit must first be subjected to vibration isolation treatment.

From this, it can be seen that after effectively reducing noise, in order to make the computer room environment more beautiful and practical, the sound-absorbing layers of walls and ceilings are usually decorated with microporous aluminum-plastic punching boards, and the lighting system is also reasonably configured. . This effectively reduces the noise in the computer room and achieves a good noise reduction effect.