音圧勾配制御による閉空間全域の静粛化(機械力学,計測,自動制御)

概要

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Active noise control based on the sum of the squared sound pressure and the squared sound pressure gradient is proposed, while the most popular control systems of the past have relied on the squared sound pressure alone. The sum of the squared sound pressure and the squared sound pressure gradient is more uniformly distributed than the squared sound pressure throughout an enclosed sound field, therefore the performance of the proposed control system is less sensitive to error sensing location. Numerical results for control systems based on the squared sound pressure, the energy density, and the sum of the squared sound pressure and the squared sound pressure gradient for a rectangular enclosure are presented. It is found that the proposed method can achieve more attenuation of the global potential energy than the others, since the sum of the squared sound pressure and the squared sound pressure gradient measurement is more capable of observing acoustic modes.
一般社団法人日本機械学会の論文
2006-12-25