Generation and processing of generator set noise

The main noise of the generator set has exhaust noise, mechanical noise, combustion noise, cooling fan and exhaust noise, air noise, generator noise, foundation vibration vibration noise.
1. Mechanical noise: Mechanical noise is mainly due to the shocking of the various moving components of the generator set during the operation of gas pressure and motion inertial force or the impact friction (noise generated by the piston crank linkage). The noise of the gas supply mechanism, the noise of the transmission gear, and the unbalanced inertial force caused by mechanical shock and noise).
2, combustion noise: the structure of diesel produced during the combustion process is shocked and noise, and the combustion noise acoustic pressure level is often high in the cylinder. However, most parts of the hair structure have a higher steel, and the self-vibration frequency is in the medium and high frequency region because the acoustic wave propagation frequency response does not match, since the cylinder pressure level peak of the low frequency segment cannot be successfully transmitted And the cylinder pressure level of the medium and high frequency band is relatively easy to pass.
3, unit fan noise consists of eddy current noise, rotary noise and mechanical noise. Drain noise, airflow noise, fan noise, mechanical noise spread through the exhaust passage, the effect of the air supply channel is to ensure the normal operation of the diesel generator and create good heat dissipation conditions to the generator set itself, the selected program should be To effectively reduce environmental noise, it is necessary to organize air activities in the room to meet the air flow required to operate the generator set to ensure the normal operation of the diesel generator set.
It is recommended to build ZUI in the future. The following schemes are used: minimize the number of oil machine houses and windows, avoid leakage of oil machine noise; increase the spacing of the oil-headed oil-in-gas base, extend the spacing interval, ZUI Building a venting chamber; increasing the expansion chamber in the exhaust of the oil machine and elongation of the exhaust port of the oil machine room expansion chamber, the five walls of the floor can be used as an absorbing treatment, according to the spectrum characteristics of the generator set Perforated plate resonance suction structure.
The generator noise includes electromagnetic noise caused by the magnetic field pulsation between the stator and the rotor, and the mechanical noise generated by the movable bearing rotation.

Noise management method
Make sure that the power generator set is not reduced by the output power, the high-efficiency sound absorbing material and the lower noise device are used to reduce, the exhaust passage, and the exhaust system to reduce the noise emission to the national scale 85dB (a).
⒈⒈ Reduce exhaust noise. Exhaust noise is the most important noise source in the unit, which is characterized by high noise level, fast exhaust speed, and difficult management. Using a special impedance-type compound muffler, exhaust noise can be reduced by 40-60 dB (a).
⒉ Reduce the axial fan noise. When reducing the noise of the generator set cooling fan, two questions are required, one is the pressure loss allowed by the exhaust passage. The second is the required muffle volume. For the above two points, the resistive sheet muffler can be used
The air inlet should be set to the generator set and the exhaust port is arranged in uniform line. The air inlet should be equipped with a resistive sheet muffler, because the air inlet pressure loss is also within the allowable range, can make the inlet and out of the machine room to balance, and the ventilation is remarkable.
The communication of indoor air, the good sound of the computer room will make the air in the closed water-cooled diesel generator unit fail to converge, the high temperature in the room can not be reduced in time, and the low noise axis flow fan can be used. Upper resistant sheet muffler
The generator plus cooling system is to increase the output power of the generator in the case where the generator volume is controlled. Otherwise, it is very large to choose from natural cooling, and the cross section of the conductor must choose greatly, in order to ensure that the insulation is not damaged.

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