Most often it is the ‘path of noise’ that is controlled by the use of acoustic enclosures, barrier walls, silencers, and other similar noise control treatments. Source of noise → path of noise →received noise SolutionsĪpplying noise control involves affecting one of these three elements. A simple model using the classical approach to noise control (shown below) allows the examination of the options for effective and economical noise control: Noise control or mitigation involves several steps, and the amount of noise reduction is driven by having to meet an environmental noise limit or some regulatory limit, not to mention workers’ safety. The reverberant field of a source is defined as that part of the sound field radiated by a source that has experienced at least one reflection from a boundary of the room or enclosure containing the source.The free field is a region in space where sound may propagate free from any form of obstruction.In the far field, the direct field radiated by most machinery sources will decay at the rate of about 6 dB each time the distance from the source is doubled. Note that the transition from near to far field is gradual in the transition region. The far field of a source begins where the near field ends and extends to infinity.The near field of a source is the region close to a source where the sound pressure and acoustic particle velocity are not in phase.These are regions that describe certain characteristics of sound propagation as illustrated in the Figure. Near field, far field, free field, and reverberant field are frequently mentioned. To analyze noise from equipment, we need to define the sound field – that is, how the sound will propagate from the equipment or the sources of noise. The sound emissions from power generation equipment can be reduced by applying noise control devices. Piping and pipe hangers not acoustically isolated from structures.Condensate pumps, condenser units, and associated piping.Fuel gas pressure regulating, metering and valve stations.Cooling towers, produce fan and gearbox noises.Steam generators, regulators, by-pass and control valves and piping.Here is a list of some of the common noise source in power plants: ![]() However, diesel engines are more predictable, and generally, the higher the horsepower or kilowatt rating, the higher the noise level because more cylinders and fuel are needed. There is no easy method to generally categorize one unit as being noisier than another, in fact, the amount of MWs turbine produce does not directly affect the noise they produce. The sound power level from equipment can spread from about 120 dB to over 155 dB depending on the size and type of machine. There are numerous main sources of noise within a power plant and only a few of the major causes are taken in the exam here. Noise pollution source in power generation plants Soundproofing mechanisms can be employed in several situations, especially industries notorious for sound pollution mostly attributed to the use of heavy-duty machinery, Power Generation plants are part of these. Soundproofing refers to the processes involved in checking the sound from entering or leaving a specified area by absorbing and/ or mitigating the sound. The science behind the sound mitigation solution applied to power plants.
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