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The noise control of diesel generators rented out by Dongguan Generator

人气:: Article Source: Popularity :: Issuing time: 2019-07-31 15:47:15
The noise control of diesel generators rented out by Dongguan Generator
Due to the characteristics of their own industries, telecommunications companies in modern cities must operate flawlessly. In order to ensure the uninterrupted operation of communication equipment such as switches, Dongguan generators generally use diesel generators as their backup power. Once the mains power fails, immediately start the diesel generators and use the mains / oil conversion screen ( ATS), and diesel generators provide power to communication equipment to ensure the normal operation of telecommunications services.
Because most of the telephone exchanges are located in densely populated areas, these areas have high environmental requirements, and diesel generator set noise often becomes the main source of pollution of the surrounding environmental noise. At present, society has higher and higher requirements for environmental protection. How to effectively control its noise pollution is a difficult task with great promotion value. This is also a major task of our communication construction and deserves more attention. . In order to do this work, we must first understand and analyze the noise composition of diesel generators.
Sound source analysis of Dongguan generator rental
Diesel noise is a complex sound source composed of multiple sound sources. According to the noise radiation method, diesel noise can be divided into aerodynamic noise and surface radiation noise. According to the mechanism, the radiated noise on the surface of a diesel engine can be divided into combustion noise and mechanical noise. Among them, aerodynamic noise is the main noise source.
Aerodynamic noise
Aerodynamic noise is caused by the unstable process of gas, that is, the disturbance of gas and the interaction between gas and objects. The aerodynamic noise directly radiated to the atmosphere includes: intake noise, exhaust noise, and cooling fan noise.
Generator rental air intake noise
Intake noise is one of the main aerodynamic noises of diesel engines. It is caused by pressure fluctuations caused by the periodic opening and closing of the intake valve. When the intake valve is opened, a pressure pulse is generated in the intake pipe, and as the piston continues to move, it is damped; when the intake valve is closed, a pressure pulse of a certain duration is also generated. This produces periodic intake noise. Its noise frequency component is mainly concentrated in the low frequency range below 200Hz. At the same time, when the airflow flows through the intake valve flow section at high speed, turbulent flow separation occurs, resulting in the generation of high-frequency noise. Because the intake valve flow section is constantly changing, turbulent noise has a certain frequency range. Mainly concentrated in the high frequency range above 1000Hz. When the natural frequency of the air column of the intake pipe is consistent with the main frequency of the periodic intake noise, the resonance noise of the air column will be more prominent in the intake noise.
For turbocharged engines, the turbocharger's speed is generally higher, so its intake noise is significantly higher than that of non-turbocharged engines. The noise of the turbocharger is caused by the rotating noise generated by the blades periodically cutting the air and the turbulent noise caused by the high-speed airflow. It is a continuous high-frequency noise mainly distributed in the frequency range of 500 ~ 10000Hz. At present, most of our companies use turbocharged engines. -Generator repair
Intake noise is related to the engine's intake method, intake valve structure, cylinder bore, cam profile and other design factors. For the same engine, it is most affected by the speed. Double the speed can increase the intake noise by 10 ~ 15dB (A). http://kongtiaoweixiu0.cn/
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