Sound Attenuators

There are many noise paths from diesel generator that must be considered. Addressing each noise path is not as simple as merely adding attenuation. A lot of other factors need to be considered. These include ventilation requirements, pressure drop considerations, space constraints, aesthetics and materials of construction. Generator noise sources include the engine, radiator fan, turbo-chargers and exhaust, each producing extremely high noise levels. When combined, these sources create broadband noise levels in excess of 110 dBA. “Standard” straight exhaust silencers may not fit or allow adequate room for transitional connections to the radiator or to louvered building openings. It is essential that silencers used to attenuate air-borne noise paths add minimal pressure drop to ensure adequate cooling airflow. Aerodynamic system effects caused by proximity of each component in the air path must be taken into consideration.

How To Size Sound Attenuators

  • Air Volume Required For Intake and Exhaust of Engine
  • Design of Axial Fan (According to Air Volume)
  • Cross-sectional Area=Air Volume/Air flow(For example: V=5m/s, Q=372m3/min=6.23m/s ,A=Q/V=6.2/5=1.24m2)
  • Length Of Sound Attenuator
  • Maximum allowable silencer PD(Pressure Drop)
  • Length, Width And Height restrictions Of Generator Room
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Sound Attenuators


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