Active Vibration Control of Ring-Stiffened Cylindrical Shell Structure Using Macro Fiber Composite Actuators

2014 ◽  
Vol 14 (10) ◽  
pp. 7526-7532 ◽  
Author(s):  
Jung Woo Sohn ◽  
Juncheol Jeon ◽  
Seung-Bok Choi
Keyword(s):  
Cylindrical Shell ◽  
Vibration Control ◽  
Shell Structure ◽  
Fiber Composite ◽  
Active Vibration Control ◽  
Stiffened Cylindrical Shell ◽  
Active Vibration ◽  
Macro Fiber Composite

Optimal Placement of MFC Actuators for Vibration Control of Cylindrical Shell Structure

2008 ◽  
Vol 56 ◽  
pp. 253-258 ◽  
Author(s):  
Jung Woo Sohn ◽  
Seung Bok Choi
Keyword(s):  
Cylindrical Shell ◽  
Vibration Control ◽  
Shell Structure ◽  
Fiber Composite ◽  
Active Vibration Control ◽  
Smart Structure ◽  
Optimal Placement ◽  
Structural Vibration ◽  
Effective Control ◽  
Lagrange’S Equation

In the present paper, active vibration control of cylindrical shell structure is conducted based on optimized actuator placement. Anisotropic piezoelectric actuator named as Macro Fiber Composite (MFC) is adopted for vibration control. The governing equations of motions of the cylindrical shell structure including MFC actuators are derived from Lagrange’s equation. For the verification of the proposed analytic model, numerical results of modal analysis are compared with those of experimental test results. Optimal placements of the MFC actuators are determined with Genetic Algorithm for the effective control performance. Robust controller is then designed to suppress structural vibration of the proposed smart structure and control performances are evaluated.

Active Vibration Control for a Large Annular Flexible Structure via a Macro-Fiber Composite Strain Sensor and Voice Coil Actuator

2015 ◽  
Vol 07 (04) ◽  
pp. 1550066 ◽  
Author(s):  
Zengyong An ◽  
Minglong Xu ◽  
Yajun Luo ◽  
Chengsong Wu
Keyword(s):  
Vibration Control ◽  
Control Algorithm ◽  
Control Method ◽  
Fiber Composite ◽  
Active Vibration Control ◽  
Active Vibration ◽  
Macro Fiber Composite ◽  
Fuzzy Control Algorithm ◽  
The Voice ◽  
Voice Coil Actuator

Large annular flexible structures (LAFS) are typical antenna structures for satellites. This structure can significantly increase antenna aperture and effectively improve communication accuracy with minimum addition of mass. LAFS have become mainstream for large aperture antenna structures. However, they have disadvantages, such as low natural frequencies, low damping ratio, and low stiffness. They easily suffer from low frequency, longtime and modal responses. Therefore, the vibration control of LAFS is very important. This study proposes a novel active vibration control method using macro-fiber composite (MFC) as a sensing unit, a voice coil actuator and a PD-fuzzy control algorithm. The MFC sensor can measure a minimum strain of 10-8 m/m. The voice coil actuator generates a displacement and driving force. Based on the feedback signal from the MFC sensor, the PD-fuzzy control algorithm controls the voice coil actuator. A dynamic model of LAFS was established, and its characteristics analyzed. A theoretical model for the voice coil actuator and MFC sensor were established, and the corresponding governing equations derived. An experimental system was set up. The results demonstrated that the novel active vibration control method has good performance. This active vibration control method can control vibration at ultralow frequencies and requires no additional stiffness.

Active Vibration Control of Smart Hull Structure Using Piezoelectric Composite Actuators

2008 ◽  
Vol 47-50 ◽  
pp. 137-140 ◽  
Author(s):  
Jung Woo Sohn ◽  
Seung Bok Choi
Keyword(s):  
Vibration Control ◽  
Fiber Composite ◽  
Equations Of Motion ◽  
Active Vibration Control ◽  
Piezoelectric Composite ◽  
Governing Equations ◽  
Linear Quadratic ◽  
Element Analysis ◽  
Hull Structure ◽  
Active Vibration

In this paper, active vibration control performance of the smart hull structure with Macro-Fiber Composite (MFC) is evaluated. The governing equations of motion of the hull structure with MFC actuators are derived based on the classical Donnell-Mushtari shell theory. Subsequently, modal characteristics are investigated and compared with the results obtained from finite element analysis and experiment. The governing equations of vibration control system are then established and expressed in the state space form. Linear Quadratic Gaussian (LQG) control algorithm is designed in order to effectively and actively control the imposed vibration. The controller is experimentally realized and control performances are evaluated.

Active Vibration Control of a Composite Sandwich Plate

2014 ◽  
Author(s):  
Giovanni Ferrari ◽  
Margherita Capriotti ◽  
Marco Amabili ◽  
Rinaldo Garziera
Keyword(s):  
Free Boundary ◽  
Boundary Conditions ◽  
Vibration Control ◽  
Sandwich Plate ◽  
Fiber Composite ◽  
Active Vibration Control ◽  
Free Boundary Conditions ◽  
Positive Position Feedback ◽  
Position Feedback ◽  
Active Vibration

The active vibration control of a rectangular sandwich plate by Positive Position Feedback is experimentally investigated. The thin walled structure, consisting of carbon-epoxy outer skins and a Nomex paper honeycomb core, has completely free boundary conditions. A detailed linear and nonlinear characterization of the vibrations of the plate was previously performed by our research group [1, 2]. Four couples of unidirectional Macro Fiber Composite (MFC) piezoelectric patches are used as strain sensors and actuators. The positioning of the patches is led by a finite element modal analysis, in the perspective of a modal control strategy aimed at the lowest four natural frequencies of the structure. Numerical and experimental verifications estimate the resulting influence of the control hardware on the modal characteristics of the plate. Experimental values are also extracted for the control authority of the piezoelectric patches in the chosen configuration. Single Input – Single Output (SISO) and MultiSISO Positive Position Feedback algorithms are tested and the transfer function parameters of the controller are tuned according to the previously known values of modal damping. A totally experimental procedure to determine the participation matrices, necessary for the Multiple-Input and Multiple-Output configuration, is developed. The resulting algorithm proves successful in selectively reducing the vibration amplitude of the first four vibration modes in the case of a broadband disturbance. PPF is therefore used profitably on laminated composite plates in conjunction with strain transducers, for the control of the low frequency range up to 100 Hz. The relevant tuning procedure moreover, proves straightforward, despite the relatively high number of transducers. The rigid body motions which arise in case of free boundary conditions do not affect the operation of the active control.

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