Reduction of the Radiating Sound of a Submerged Finite Cylindrical Shell Structure by Active Vibration ControlReport as inadecuate




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1

Department of Mechanical, Robotics and Energy Engineering, Dongguk University-Seoul, 30 Pildong-ro 1-gil, Jung-gu, 100-715 Seoul, Korea

2

Department of Mechanical Design Engineering, Kumoh National Institute of Technology, Daehak-ro 61, Gumi, 730-701 Gyeongbuk, Korea

3

Smart Structures and Systems Laboratory, Department of Mechanical Engineering, Inha University, 253 Young-Hyun Dong, Nam-Gu, 402-751 Incheon, Korea





*

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Abstract In this work, active vibration control of an underwater cylindrical shell structure was investigated, to suppress structural vibration and structure-borne noise in water. Finite element modeling of the submerged cylindrical shell structure was developed, and experimentally evaluated. Modal reduction was conducted to obtain the reduced system equation for the active feedback control algorithm. Three Macro Fiber Composites MFCs were used as actuators and sensors. One MFC was used as an exciter. The optimum control algorithm was designed based on the reduced system equations. The active control performance was then evaluated using the lab scale underwater cylindrical shell structure. Structural vibration and structure-borne noise of the underwater cylindrical shell structure were reduced significantly by activating the optimal controller associated with the MFC actuators. The results provide that active vibration control of the underwater structure is a useful means to reduce structure-borne noise in water. View Full-Text

Keywords: underwater cylindrical shell structure; macro fiber composite actuator; optimal controller; structural vibration control; structure-borne noise underwater cylindrical shell structure; macro fiber composite actuator; optimal controller; structural vibration control; structure-borne noise





Author: Heung Soo Kim 1, Jung Woo Sohn 2, Juncheol Jeon 3 and Seung-Bok Choi 3,*

Source: http://mdpi.com/



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