, Volume 10, Issue 1, pp 88-97
Date: 02 Apr 2011

Active control of structurally radiated sound from an elastic cylindrical shell

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Abstract

A numerical and experimental study was presented on active control of structurally radiated sound from an elastic cylindrical shell. An analytical model was developed for the active structural acoustic control (ASAC) of the cylindrical shell. Both global and local control strategies were considered. The optimal control forces corresponding to each control strategy were obtained by using the linear quadratic optimal control theory. Numerical simulations were performed to examine and analyze the control performance under different control strategies. The results show that global sound attenuation of the cylindrical shell at resonance frequencies can be achieved by using point force as the control input of the ASAC system. Better control performance can be obtained under the control strategy of minimization of the radiated sound power. However, control spillover may occur at off-resonance frequencies with the control strategy of structural kinetic energy minimization in terms of the radiated sound power. Considerable levels of global sound attenuation can also be achieved in the on-resonance cases with the local control strategy, i.e., minimization of the mean-square velocity of finite discrete locations. An ASAC experiment using an FXLMS algorithm was implemented, agreement was observed between the numerical and experimental results, and successful attenuation of structural vibration and radiated sound was achieved.

Foundation item: Supported by the National Natural Science Foundation of China (No.10802024), Research Fund for the Doctoral Program of Higher Education of China (No. 200802171009), the Natural Science Foundation of Heilongjiang Province (No.E200944), Innovative Talents Fund of Harbin (No.2009RFQXG211) and Fundamental Research Fund of HEU (No. HEUFT08003).
Guoyong Jin was born in 1980. He received his PhD degree from Harbin Engineering University in 2007. Now he is an associate professor at Harbin Engineering University. He has published several scientific papers in various periodicals. His research interests include vibration and noise analysis, active noise and vibration control (ANVC), etc.
Xiaoling Liu was born in 1980. She received her MS degree from Harbin Engineering University in 2008. Now she is an engineer in China Shipbuilding Information Center. Her current research interests include vibration and noise analysis and control, shipbuilding information, etc.
Zhigang Liu was born in 1956. He received BS and MS degrees from Harbin Ship Engineering Institute in 1981 and 1987 respectively, and then received PhD degree from Harbin Engineering University in 2000. Now he is the president of Harbin Engineering University and a professor and supervisor for PhD students. His main research interests include vibration and noise control, diesel dynamics, etc.