THREE-DIMENSION OF ACTIVE CONTROL OF SOUND IN THE RIGID RECTANGULAR ROOM

• Main Authors: David-yang, 楊炅軒
• Other Authors: 李仁傑
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/13363573776787319194

碩士 === 國立臺灣海洋大學 === 輪機工程系 === 93 === The modal design and control problem of three dimensional rigid close space is investigated by the theory of active noise control in this paper.The active control equation for multiple point is derived from the wave equation by using the optimal control theory and LMS method.The potential energy of sound field with and without active control can be found by calculating the optimal control source volume velocity.The results show that the less modes with small amplitude can be excited by the source near the center of the acoustic field.Therefore the effective control can be obtained by using the control source near the corner of the acoustic field.To control the low frequency modal amplitude ,the control source can near the primary source as close as possible.