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Smart Structures and Systems Volume 25, Number 6, June 2020 , pages 643-655 DOI: https://doi.org/10.12989/sss.2020.25.6.643 |
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Active vibration control of nonlinear stiffened FG cylindrical shell under periodic loads |
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Habib Ahmadi and Kamran Foroutan
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| Abstract | ||
| Active control of nonlinear vibration of stiffened functionally graded (SFG) cylindrical shell is studied in this paper. The system is subjected to axial and transverse periodic loads in the presence of thermal uncertainty. The material composition is considered to be continuously graded in the thickness direction, also these properties depend on temperature. The relations of straindisplacement are derived based on the classical shell theory and the von Kármán equations. For modeling the stiffeners on the cylindrical shell surface, the smeared stiffener technique is used. The Galerkin method is used to discretize the partial differential equations of motion. Some comparisons are made to validate the SFG model. For suppression of the nonlinear vibration, the linear and nonlinear control strategies are applied. For control objectives, the piezoelectric actuator is attached to the external surface of the shell and the thin ring piezoelectric sensor is attached to the middle internal surface of shell. The effect of PID, feedback linearization and sliding mode control on the suppression of vibration for SFG cylindrical shell is presented. | ||
| Key Words | ||
| nonlinear vibration; stiffened cylindrical shells; active control; functionally graded materials | ||
| Address | ||
| Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran. | ||