Two-Degree-of-Freedom Action Noise Controller Design and Implementation

• Main Authors: YUH-TYAN YU, 余玉田
• Other Authors: JONG-YIH LIN
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/46079864434623061438

碩士 === 國立中興大學 === 機械工程學系 === 88 === ABSTRACT Active noise control and implementation for an acoustic duct system of actuating dynamics is studied in this thesis by using two-degree-of freedom approach. A hybrid system identification technique is first utilized to establish a model that includes dynamics of one-dimensional sound field and associated actuating subsystems. Based on this model, feed-forward active noise controllers are then designed to attenuate wide-band disturbance by using a model matching technique. Furthermore, two-degree-of freedom controllers are obtained by combining the feed-forward noise controllers with the feedback noise controllers designed in [16] using 2 periodic control signals. These controllers are implemented in experiments by using a floating-point digital signal processor. Both computer simulation and experimental results show global wide-band noise reduction for each of the feed-forward noise controllers and two-degree-of freedom controllers.