The main noise sources are diesel generators produce, including exhaust noise, mechanical noise and combustion noise, exhaust noise and the cooling fan, air intake noise, noise generators, transmission of vibration generated by the ground noise:? 1, exhaust noise. Exhaust noise is a high temperature, high-speed pulsating airflow noise, engine noise is one of the largest energy, up to 100 db above the noise, engine noise is always the most important part. Generator exhaust noise generated when the work through a simple exhaust pipe (exhaust turbine wife) direct discharge, and with the air speed increases, the noise frequency is also significantly improved, so that the life of nearby residents, severely affected by the work . 2, mechanical noise and combustion noise. Mechanical noise is dominated by the moving parts of the engine vibration gas pressure and inertia forces caused by periodic changes during operation or mutually impact generated. It has spread far from the noise, failure to reduce characteristics. Combustion noise is structural vibration and noise generated by diesel fuel in the combustion process. ? 3, the cooling fan and exhaust noise. Unit fan noise is generated by the vortex noise, noise, and mechanical noise rotating components. Exhaust noise, air noise, fan noise, mechanical noise will spread out through the exhaust passages, resulting in noise pollution to the environment. ? 4, into the wind noise. The role of the inlet channel is: to ensure the normal operation of the engine and the unit itself to create a good heat dissipation. Inlet channel units must be able to smoothly enter the room into the wind, but the mechanical noise of the unit, the airflow will be radiated noise outside the room through the inlet channel. ? Principles of diesel generator room noise reduction is in ensuring that the diesel generator set ventilation without reducing the output power of the premise, and the efficient use of sound-absorbing material for noise muffler inlet and exhaust channels and exhaust systems for noise reduction so that noise emissions to meet the national standard (85db (a)). The company's main business: machinery and equipment noise, industrial noise control, acoustic design, residential soundproofing, studio acoustic renovation, piano acoustic treatment, etc. For more details, please consult the Sichuan Science and Technology Co., Ltd. Haiyan acoustics. Tel: 13088089746 18208167335