Noise reduction scheme
Diesel generator sets are mechatronic devices that convert the chemical energy of fuel into electrical energy. Today, with the increasing modernization, especially with the rapid development of computer networks and communications, the reliability of equipment for power supply is also Increasingly, because of the short power supply time of the ups power supply. This makes the diesel generator set have a broad space for development, but the diesel generator set provides convenience for people, and because the noise of the unit directly affects people's health, work and life. With the gradual improvement of people's environmental requirements, how to solve and overcome the above problems has become the key to the application and development of diesel generator sets. Here we focus on the occurrence and solution of diesel generator set noise.
    The working principle of the diesel generator, the noise generated is very complex, resulting from the cause and location up points: 1, exhaust noise; 2, mechanical noise; 3, combustion noise; 4, a cooling fan, and exhaust noise; 5 Wind noise; 6 , generator noise.
    The following sections explain each of the six parts:
     1 , exhaust noise:
     Exhaust noise is a high-temperature, high-speed pulsating airflow noise, which is the most energy-intensive part of engine noise. It is much higher than the intake noise and the mechanical noise of the body radiation, and is the most important component 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 pulsation noise caused by periodic smoke exhaust, air column resonance noise in exhaust pipe, Helmholtz resonance noise of cylinder, high-speed airflow through valve clearance and tortuous pipe The noise generated by the time, the eddy current noise, and the regenerative noise generated by the smoke system under the excitation of the pressure wave in the pipeline increase the noise frequency significantly as the airflow speed increases.
     2 , mechanical noise:
     The mechanical noise is mainly caused by the vibration or mutual impact caused by the cyclic changes of the gas pressure and the inertia of the motion during the operation of the moving parts of the engine. The most serious ones are the following: the noise of the piston crank linkage mechanism, The noise of the valve train, the noise of the transmission gear, and the mechanical vibration and noise caused by the unbalanced inertia force. The strong mechanical vibration of the diesel generator set can be transmitted to the outside through the ground for a long distance, and then the radiation through the ground forms noise. This structure of noise propagation is far away, and the attenuation is reduced. Once formed, it is difficult to isolate.
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