Generator set is running, usually produce 95 to 128 db (a) noise. If you do not take the necessary noise reduction measures, the unit is running around the noise will cause serious environmental damage. In order to protect and improve environmental quality, noise control. 

 The main noise sources of diesel generator sets are generated in diesel exhaust noise, mechanical noise and combustion noise, cooling fan and the exhaust noise into the wind noise, generator noise, ground vibrations pass noise: 
 1, the exhaust noise. The exhaust noise is a high temperature, high-speed pulse of air noise, engine noise energy, the noise of up to 100 db or more, the most important part of engine noise. Exhaust noise generated in the generator when working through a simple exhaust pipe (generator set Original exhaust pipes) directly discharged, and with the flow velocity increases, the noise frequency is also significantly improved, so that the lives of nearby residents, the work caused a serious impact. 
 2, mechanical noise and combustion noise. The mechanical noise is the vibration caused by the periodic variation of the gas pressure and inertia force of the engine moving parts during operation or mutual impact. It has far noise propagation characteristics, failure to reduce. Combustion noise is generated by the diesel combustion process of structural vibration and noise. 
 3, the cooling fan and exhaust noise. The unit fan noise by the eddy current noise, rotation, noise and mechanical noise. Exhaust noise, air noise, fan noise, mechanical noise through the exhaust channel spread out, thus causing noise pollution on the environment. 
 4, into the wind noise. The air inlet channel role is to: ensure that the engine work properly and the unit itself to create a good thermal conditions. Unit into the air channel must be able to make smooth air intake into the engine room, but the unit of mechanical noise, flow noise will be radiated through the air inlet channel to the engine room outside. 
 The transmission of noise, ground vibration. Diesel strong mechanical vibrations through the foundation of long-distance spread to the outdoor everywhere and then through the ground re-radiated noise. 

 Diesel generator room noise reduction processing principle is to ensure the ventilation of diesel generator sets that do not reduce the output power under the premise of efficient sound-absorbing materials and noise muffler for noise reduction, into the exhaust channel and the exhaust system, so that noise emissions to meet the national standard (55db (a)). 

 Solution; 

 Generator noise is the most fundamental way is to proceed from a sound source, the use of a conventional noise reduction techniques; such as muffler, sound insulation, sound absorption, vibration isolation is the most effective way. 
 1, reduce exhaust noise. The exhaust noise is the noise of the unit main source, which is characterized by high noise level, the exhaust speed and difficult to control. Using a special impedance compound muffler, generally make the exhaust noise to reduce the 40-60 db (a). 
 2, reducing the axial flow fan noise. Reduce the cooling fan noise of the generator set, we must consider two questions, First, the exhaust channel to allow the pressure loss. Second, the requirements of the muffler. In response to these two points, the choice of the resistive chip muffler. 
 3, the engine room sound insulation, acoustic treatment and Vibration Isolation 
 1), the engine room sound insulation. Exhaust noise and cooling fan noise reduction unit, the rest of the main noise source is a diesel engine mechanical noise and combustion noise. The approach is in addition to the necessary connection with the observation room Interior observation windows, and the remaining windows were removed, all the holes, the hole should be dense block, brick wall sound insulation requirements to be more than 40 db (a). The engine room doors and windows, fire-resistant sound insulation doors and windows. 
 (2), air intake and exhaust. Engine room sound insulation to solve the problem of the engine room ventilation and heat dissipation. Air inlet and generator sets, air vents set in a straight line. Into the outlet should be accompanied by a resistive-piece muffler, air inlet pressure loss is within the permissible range, the natural balance out of the air volume inside the engine room, the ventilation and heat dissipation effect. 
 (3), acoustic treatment. The engine room in addition to the five wall outside the ground can be used for acoustic treatment, perforated plate resonance absorbing structure based on the spectral characteristics of the generating units. 
 (4), the exchange of indoor air, good sound insulation of the engine room, make closed water-cooled generator set shutdown timing of the room air no convection, the high temperature of the room, unable to come down, can be low-noise axial fan matched resistive chip muffler problem can be solved. 
 (5), unit isolation. In strict accordance with the relevant information provided by the manufacturer before installation of the generator set, isolation and handling, to avoid causing structural sound long-distance propagation, and continuous radiation in the dissemination of airborne sound, can not make the noise level of the factory sector compliance. Governance requirements due to excessive and existing generating units, must be measured the vibration of the unit near the ground, if the vibration sense is obvious, then the first generator set vibration isolation. 
 Effectively reduce the noise to make the room environment more beautiful and practical, usually outside walls and ceiling of the absorption layer, microporous aluminum punching plate decoration, while the rational allocation of lighting systems.