1. Mechanical noise: The mechanical noise of diesel generator sets is mainly generated by the vibration or mutual impact caused by the periodic changes in gas pressure and inertia force of various moving parts of the engine during operation. These noises vary with the speed and load of moving parts, including pistons, cylinder heads, cylinder blocks, connecting rods, crankshafts, etc.
2. Combustion noise: During the combustion process, the pressure and vibration generated by combustion can cause noise in the engine structure, which can be transmitted through components such as the engine casing and cylinder head. Combustion noise is an important component of diesel generator noise.
3. Exhaust noise: Exhaust noise is a high-temperature, high-speed pulsating airflow noise that is a type of energy in engine noise. Exhaust noise is mainly discharged directly through simple exhaust pipes. As the airflow velocity increases, the frequency of the noise also increases significantly, which seriously affects the lives and work of nearby residents.
4. Electromagnetic noise: The electromagnetic noise in the generator section is mainly generated by the high-speed rotation of the armature winding in the magnetic field. This noise is related to the speed and load of the generator, and is an important component of the total noise of the generator.
5. Fan noise: Diesel generator sets are usually equipped with cooling fans to cool the engine and generator. When the fan rotates, air creates vortices around the blades, resulting in fan noise. This noise is related to the speed of the fan and the number of blades.
6. Inlet and exhaust noise: The function of the inlet and exhaust channels is to ensure the normal operation and heat dissipation of the engine, but at the same time, they can also transmit mechanical noise, airflow noise, etc. to the outside of the engine room.
7. Ground vibration transmission noise: The mechanical vibration of diesel engines can be transmitted to the outside through the foundation over long distances, and then radiated noise through the ground.
The methods to reduce the noise of diesel generator sets include:
1. Optimization design: In the design and manufacturing process, low-noise materials and technologies are used to reduce mechanical vibration and airflow noise.
2. Install muffler: Install a muffler in the exhaust system to reduce exhaust noise.
3. Sound insulation treatment: Conduct sound insulation treatment on the computer room, using sound insulation materials and structures to reduce the transmission of mechanical noise and exhaust noise.
4. Regular maintenance: Regularly inspect and maintain mechanical components to reduce noise caused by wear or damage.
