Classification of Diesel Generator Noise

Today we will give you a brief introduction to the different types of noise from diesel generators. If you want to get more information, welcome to visit our website.

Exhaust noise: Exhaust noise is a high-temperature, high-speed pulsating airflow noise, which is the most energy and component part of engine noise. It is much higher than the intake noise and the mechanical noise radiated by the body, and it is the most important part of the total engine noise. Its fundamental frequency is the firing frequency of the engine. The main components of exhaust noise are as follows: low-frequency pulsating noise caused by periodic exhaust smoke, air column resonance noise in the exhaust pipe, Helmholtz resonance noise of the cylinder, high-speed airflow through the valve gap and tortuous pipes When the noise, eddy current noise and the regenerated noise generated by the exhaust system under the excitation of the pressure wave in the pipe, etc., the noise frequency increases significantly with the increase of the airflow speed.

Mechanical noise: Mechanical noise is mainly caused by the vibration or mutual impact caused by the periodic changes of gas pressure and movement inertia force of the moving parts of the engine during operation. The most serious ones are the following: Piston crank connecting rod mechanism The noise, the noise of the valve mechanism, the noise of the transmission gear, the mechanical vibration and noise caused by the unbalanced inertial force. The strong mechanical vibration of the diesel generator can be transmitted to various places outdoors through the foundation for a long distance, and then form noise through the radiation of the ground. This kind of structural noise spreads far and attenuates, and once formed, it is difficult to isolate.

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 very high. However, most parts of the engine structure have high rigidity, and their natural frequency is mostly in the middle and high frequency region. Due to the mismatch of the frequency response to the sound wave propagation, it is because in the low frequency range. The very high peak cylinder pressure level cannot be transmitted smoothly, while the cylinder pressure level in the mid-to-high frequency range 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 caused by the periodic disturbance of the cutting air flow of the fan blade; the eddy current noise is when the airflow separates on the rotating blade section The vortex caused by the viscosity of the gas radiates an unstable flow noise. Exhaust air noise, airflow noise, fan noise, and mechanical noise are all radiated through the exhaust air channel.

Guangxi Dingbo Generator Set Manufacturing Co.,Ltd. was founded in 2006 and is one of the earliest manufacturers of generators and diesel generator sets in China. The company has a registered capital of 9.5 million yuan. The main products are diesel engines, generator sets, and diesel generators, providing users with a one-stop service of design, supply, debugging and maintenance at any time. Dingbo has always insisted on using first-class talents, building first-class enterprises, manufacturing first-class products, creating first-class services, and making every effort to build a first-class domestic enterprise. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to sales@dieselgeneratortech.com.