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Affiliation of Author(s):航空学院

Journal:J Vib Shock

Abstract:Based on the active acoustical boundary method, an active double-panel sound insulation structure was presented, which consists of a double-panel structure and an active acoustical boundary arranged on the boundary of the air gap sound field. Simply supported panels were used to replace the active acoustical boundary and were acted by control forces. In the light of the acoustoelsticity theory, an analytical model was developed to calculate the optimal control forces, considering the minimum radiation sound power and minimum air gap sound power as the control targets. On the basis of the developed theoretical model, the sound transmission loss (STL) and responses of the subsystems of the active double-panel sound insulation structure were studied before and after control. Meanwhile, the effect of the dimensions of the active acoustical boundary on STL and responses of the subsystems were taken into account. The simulations carried out show that the active acoustical boundary control strategy can effectively improve the sound insulation performance of double-panel structures and the better control effect can be gotten with the target of minimum radiation sound power than that with the target of minimum air gap sound power. The active acoustical boundary has no influence on the vibration responses of the upper panel whilst the vibration responses of the lower panel and the air gap sound power are suppressed effectively. The active acoustical boundaries with different dimensions can all improve the sound insulation performance. Especially, in low frequency range, the same insulation performance can be gotten for the different dimensions, but in high frequency, range, the effect of the dimensions of active acoustical boundaries on the STL and responses of subsystems has no definite regularity, so the dimensions of the active acoustical boundaries can be optimized to improve the insulation performance in certain specific frequency ranges. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

ISSN No.:1000-3835

Translation or Not:no

Date of Publication:2017-11-15

Co-author:Ning, Shaowu,Xu, Xinyin

Correspondence Author:Ning, Shaowu,Shi Zhiyu