CHEN Ke'an¹  CHEN Guoyue²  LI Shuang¹  PAN Haoran¹

(1 College of Marine, Northwestern Polytechnical University Xi'an 710072)

(2 Faculty of System Science and Technology, Akita Prefectural University  

84-4 Ebinokuchi, Tsuchiya, Honjo, Akita, 015-0055 Japan) 

Received Apr. 18, 2006 

Revised Sept. 13, 2006 

Abstract  The nearfield error sensing approach, which is one of the key problems encountered in the implementation of active acoustic structure, is investigated theoretically. The basic idea involves a limited number of PVDF film pairs be boned to the surface of the primary panel and secondary panels for measuring the total radiated sound power. In this paper, first, a theoretical model associated with the active acoustic structure is established. Second, the formulae for the shape coefficient of the PVDF pairs are derived based on the acoustic radiation modes and a PVDF sensing model. Finally, a number of computer simulations are performed and the shape of the PVDF pairs and corresponding reduction in the radiated sound power are calculated. The results demonstrate the feasibility of the proposed nearfield error sensing strategy.

PACS number: 43.50, 43.40