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- W2189095861 abstract "This paper summarizes work on applying active and passive noise control to minimize the globally radiated noise of a 2kW portable generator set. The radiated noise of the operating baseline generator set was first measured with a near field microphone array and far field pressure was then estimated using spherical harmonic radiation functions. The spectrum of the radiated noise showed strong tonal characteristics at low frequencies due to the diesel engine making it a good candidate for active noise control (ANC) in that frequency region. However calculations indicated that ANC on its own, while providing high attenuation in the control bandwidth, will lead to only a small reduction in overall A weighted sound pressure levels. Thus passive treatment was applied to control the mid to high frequencies. An optimization technique based upon noise measurements of the passively treated, operating generator set and spherical harmonic radiation functions used in conjunction with a genetic algorithm were used to design the ANC system. The designed ANC system was implemented as a fully integrated, self powered installation into the generator set and the passive and active/passive attenuation in sound measured during operation. The results indicate around 10dBA passive attenuation and additional 5dBA attenuation due to the active system and indicate the performance advantages of an optimally designed ANC system. The work also demonstrates how, in many applications, it is necessary to apply a combined active/passive approach to obtain a wide bandwidth of attenuation and a corresponding significant reduction in overall A weighted sound pressure level." @default.
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- W2189095861 date "2012-01-01" @default.
- W2189095861 modified "2023-09-27" @default.
- W2189095861 title "Active-passive control of portable generator set radiated noise" @default.
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