How To Make Your Diesel Generator Quiet

Diesel generator set is a kind of mechatronics equipment which converts the chemical energy of fuel into electric energy. With the increasing modernization, especially with the rapid development of the network and communication, the demand for the reliability of power supply is also increasing. Because the ups power supply has the problem of short power supply time, then the diesel generator has a broad development space. However, diesel generator sets not only provide convenience for people, but also directly affect people's health, work and life because of the noise of diesel generator set. With the gradual improvement of environmental requirements, how to solve and overcome the above problems has become the key to the application of diesel generator sets. Here, we mainly introduce the causes and solutions of the noise generated by diesel generator sets.

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When the running speed of a generator set is at rpm, it will produce a noise of 105dB at a distance of one meter from the genset. In order to avoid the noise coming out of the generator room, the genset noise solution should include the following links.

Sound Absorption and Insulation

1. Initial sound absorption and sound insulation processing in the generator room.

2. Intake and exhaust systems and exhaust gas emission systems should be designed with silencing air tanks.

3. Sound insulation bandaging of exhaust pipes. This not only reduces the heat emission into the generator room but also minimizes the working vibrations of the generator set, effectively decreasing generator noise.

Diesel generator set noise can be classified into three parts: mechanical noise, combustion noise, and aerodynamic noise.

Mechanical Noise

The first part: mechanical noise is primarily caused by the collisions and friction of components such as the crankshaft, connecting rod, and gears. The control of mechanical noise should be taken at the design stage. For instance, reducing cylinder diameter, increasing stroke diameter ratio, decreasing calibration speed, and developing low-noise diesel engines are effective measures.

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Combustion Noise

The second part: combustion noise from direct injection combustion chambers often serves as the main sound source for diesel engines. Adjusting the advance angle of the nozzle can effectively reduce this noise.

Aerodynamic Noise

The third part: aerodynamic noise consists of exhaust, intake, and fan noise, with exhaust noise being the most significant. Sound levels can reach up to 115-128 dB at just 0.5 m from the exhaust port. Mufflers are a highly effective solution for managing this noise and can be combined with filters for optimal performance.

Noise Reduction Strategies

Two methods to tackle diesel generator noise include applying noise reduction techniques in the diesel generator room or purchasing silent type generator set.

1. Control of mechanical noise: Covering the top and surrounding walls of the generator room with high absorption and sound insulation materials helps to eliminate indoor reverberation and reduces sound energy density and reflection intensity.

2. Air intake and exhaust noise reduction: Utilize the intake and exhaust air channels in the generator room as soundproof barriers by installing silencers in these channels.

3. Smoke noise reduction: Install two-stage silencers in the smoke exhaust system, which is based on the original one-stage systems for effective control of exhaust noise. Additionally, increasing the length of the exhaust pipe to over 10 meters can help by enlarging the diameter of the exhaust motor, reducing back pressure.

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