How to Effectively Control the Exhaust Noise of Volvo Diesel Generator Sets

When a 500kw Volvo diesel generator set is running, if the unit is not noise-reduced by necessary means, it will generally produce a unit operating noise of 95-125dB(A), which is undoubtedly a kind of noise pollution to the surrounding environment;The exhaust noise of the unit noise is the largest noise source of the 500kw Volvo diesel generator set. It has the characteristics of extremely high noise, fast exhaust speed, and difficult management.

The main components of the exhaust noise of a 500kw Volvo diesel generator set are as follows:

a. Low-frequency pulsating noise caused by periodic exhaust;

b. Air column resonance noise in the exhaust pipe;

c. Helmholtz resonance noise of the cylinder;

d. The injection noise produced by the high-speed airflow passing through the exhaust valve annular gap and the tortuous pipe.

e. The regenerative noise and eddy noise generated by the exhaust system under the excitation of the pressure wave in the pipe will form a continuous high-frequency noise spectrum with a frequency above 1000hz, and as the airflow speed increases, the frequency will increase significantly.

Exhaust noise is the first part of noise reduction control, because it is 10-15db (a) higher than the diesel engine noise; the correct selection of muffler (or muffler combination) can reduce exhaust noise by 20-30db (a) )above.

Muffler is a basic method to control exhaust noise. According to the principle of noise elimination, the structure of muffler can be divided into two categories: resistive muffler and resistive muffler:

（1) Resistance muffler (industrial muffler).

Using porous sound-absorbing materials, arranged in the pipeline in a certain way, when the airflow passes through the resistive muffler, the sound waves will cause the air and fine fibers in the pores of the sound-absorbing material to vibrate. Due to friction and viscous resistance, the sound energy becomes heat energy and is absorbed, thereby playing a sound damping effect.

(2) Resistant muffler (residential muffler).

Use pipes of different shapes and resonant cavities to make appropriate combinations, and achieve the purpose of attenuating noise by means of reflection and interference caused by acoustic impedance mismatch caused by changes in pipe section and shape.The noise reduction effect is related to the shape, size and structure of the pipe. Generally, it has strong selectivity and is suitable for the reduction of narrow-band noise and low- and intermediate-frequency noise.

Noise reduction treatment of 500kw Volvo diesel generator set exhaust system:

Dingbo Power generally uses a combination of a corrugated vibration damping joint, an industrial muffler and a residential muffler to effectively isolate the transmission of exhaust vibration and exhaust noise.At the same time, heat-insulating and sound-proofing the exhaust pipe can also improve the operating environment of the unit and the noise caused by the exhaust pipe.

Volvo diesel generators are a good unit brand. Although the price of the unit is high, the quality is guaranteed. Users can rest assured to purchase, but in order to ensure the quality of the unit and after-sales service, you must choose a regular manufacturer!Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. has been specialized in manufacturing diesel generator sets for 15 years. It can provide generator sets of Volvo, Cummins, Yuchai, Shangchai and other domestic and foreign brands. It is fully responsible for the stock supply, and provides one-stop design, supply, debugging, and maintenance free of charge. Service If you are interested in diesel generators, please contact us by email dingbo@dieselgeneratortech.com.