進行波を制御信号に用いるダクト用広帯域アクティヴ形消音システムの開発 : 第2報,適応制御システムの試作と基礎実験

概要

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A new active noise control system forair-conditioning ducts is presented, together with computer simulations and experimental results. The system feed forwardly controls the second source using the signal of the progressive wave conmponent of fluid-borne noise detected upstream of the duct, and has the capability to change system parameters owing to a programmable digital signal processor. The adaptive feed-forward control structure is based on the "filtered-X" LMS algorithm. It is established through testing of a small model apparatus that pressure pulsation (noise) in a duct downstream of the second source can be reduced by at least 20 dB for almost all harmonics of around 40 Hz to 1000 Hz, while maintaining stability, even in the case where uncontrolled system parameters such as acoustic properties and dynamic characteristics of the second source change with time. It is also shown that the computer simulations agree well quantitatively with the experimental results and can be applied successfuly to system design.
一般社団法人日本機械学会の論文
1996-06-25