What major categories are divided into noise in diesel generator sets

The problem that customers who use diesel generators to trouble ZUI is the deafening sound. In addition to the sound of the generator itself, these sounds can be divided into the following:
1, exhaust noise: exhaust is a high temperature, high-speed pulpity airflow noise, is large in engine noise. It is mainly divided into: Periodic smoke caused low frequency pulse noise, gas column resonance noise in exhaust pipes, Helm Holz resonance noise, high-speed airflow, noise, eddy current noise, and Regeneration noise or the like under pressure wave insertion in the pipeline.
2, mechanical noise: mechanical noise is vibration caused by cycle changes from gas pressure and motion inertial force during operation of each moving member, wherein the most severely: noise, gas supply mechanism of the piston crank link mechanism. Noise, noise of transmission gears, mechanical vibration and noise caused by unbalanced inertia.
3, combustion noise: combustion noise is the structural vibration and noise generated during the combustion process. In the cylinder, the combustion noise acoustic pressure level is high, but the steel resistance of most parts in the engine structure is high, and the self-vibration frequency is in the medium and high frequency region, since the sound wave propagation frequency response does not match, in the low frequency band very High cylinder pressure level peaks cannot be successfully passed, while the cylinder pressure level of the medium and high frequency sections is relatively easy to pass.
4, cooling fan and exhaust noise: unit fan noise is composed of vortex noise and rotary noise, eddy current noise is generated when the airflow is separated on a rotating blade cross section, and the rotary noise is cut by the blade of the fan to create periodic disturbance. Cause.
5, inlet noise: Diesel generator sets need enough new wind supply when working properly, and ensure the normal operation of the engine, on the other hand, to create a good heat dissipation condition. The airflow system of the unit includes the intake system of the airway and the engine itself, the inlet air passage of the unit must enable the new air into the computer room, and the mechanical noise of the unit can also be radiated outside the machine room through this airflow channel. .
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