As an important backup power equipment, diesel generator sets play a key role in many fields. However, with the increasing awareness of environmental protection and noise pollution, we are paying more and more attention to the noise problem of diesel generator sets. This article analyzes the main causes of diesel generator noise.

1. Smoke exhaust noise: mainly caused by high-temperature, high-speed pulsating airflow, including low-frequency pulsating noise, air column resonance noise, Helmholtz resonance noise, etc.
2. Mechanical noise: generated due to the vibration and mutual impact of various moving parts of the engine during operation, including the noise of the piston crank connecting rod mechanism, the noise of the valve mechanism, etc.
3. Combustion noise: Structural vibration and noise generated during diesel combustion are caused by high combustion pressure in the cylinder and are transmitted through the structure.
4. Cooling fan and exhaust noise: Noise generated by periodic disturbances and vortex flow caused by fan rotation and air flow separation.
5. Inlet noise: mechanical noise and air flow noise in the air inlet channel.
6. Generator noise: electromagnetic and mechanical noise generated by the magnetic field pulsation of the stator and rotor and the rotation of rolling bearings.

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