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What Are The Causes of Diesel Generator Noise

Nov. 24, 2021

Today we will give you a brief introduction to the causes of noise from diesel generators. If any else you need to know, welcome to visit our Starlight website.

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Exhaust noise: Exhaust noise is high-temperature, high-speed pulsating airflow noise, and it is the energy and component part of engine noise. Much higher than the intake noise and the mechanical noise emitted by the body, it is the main component of the total engine noise. The fundamental frequency is the firing frequency of the engine. Exhaust noise mainly includes: low-frequency pulsating noise caused by periodic exhaust smoke, air column resonance noise in the exhaust pipe, Helmholtz resonance noise of the cylinder, noise generated when high-speed airflow passes through the valve gap or snake pipe, vortex noise , The regenerative noise generated by the smoke exhaust system under the excitation of the pressure wave in the pipe

Mechanical noise: Mechanical noise is mainly caused by vibration or mutual impact caused by the periodic changes of gas pressure and motion inertia force of the moving parts of the engine during operation. The serious ones are: the noise of the piston crank connecting rod mechanism and the air valve mechanism. The noise, the noise of the transmission gear, the mechanical vibration caused by the unbalanced inertial force, and the strong mechanical vibration of the noisy diesel generator can be transmitted to various places outdoors through the foundation for a long distance, and then the noise is formed by the ground radiation. The noise of this kind of structure travels far, the attenuation is reduced, and it is difficult to cut off once it is formed.

Combustion noise: Combustion noise is the structural vibration and noise produced by diesel fuel during combustion. The sound pressure level of combustion noise in the cylinder is high, but many components in the engine structure have high rigidity, and their self-oscillation frequency is mostly in the middle and high frequency bands, and the response to the sound wave propagation frequency is not appropriate, so the cylinder pressure level is high in the low frequency band. The peak value of C can't be transmitted well, and the cylinder pressure level in the middle and high frequency bands is relatively easy to transmit.

Cooling fan and exhaust noise: Diesel generator fan noise is composed of eddy current noise and rotating noise. The rotating noise is the eddy current noise caused by the periodic interference of the cutting air flow of the fan blade, which is generated when the airflow is separated on the rotating blade section. Yes, it can avoid the unstable flow noise caused by the vortex caused by the viscosity of the gas, exhaust noise, airflow noise, fan noise, and mechanical noise are all radiated through the exhaust passage.

Intake noise: Diesel generators need a sufficient supply of fresh air when they work normally. On the one hand, they can ensure the normal operation of the engine. On the other hand, if good heat dissipation conditions are not created for the diesel generators, the diesel generators cannot guarantee their performance. The air intake system of the unit basically includes the air intake channel and the engine's own air intake system. The air intake channel of the unit is a mechanical room that must allow fresh air to enter smoothly. At the same time, the mechanical noise and airflow noise of the unit can also be radiated through the air intake channel. Go outside the machine room.

Generator noise: Generator noise includes electromagnetic noise caused by magnetic field pulsation between the stator and rotor and mechanical noise caused by the rotation of rolling bearings. According to the above noise analysis of diesel generators. Generally, the noise of diesel generators is reduced in the oil chamber, or a sound-proof diesel generator (the noise is 80db---90db) is used when purchasing.

Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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