Active vibration control of ring-stiffened cylindrical shell structure using macro fiber composite actuators

Area of Science:

• Structural dynamics
• Vibration control engineering
• Materials science

Background:

• Ring-stiffened cylindrical shells are critical in aerospace and mechanical systems.
• Effective vibration control is essential for performance and longevity.
• Piezoelectric actuators offer promising solutions for active vibration suppression.

Purpose of the Study:

• To experimentally evaluate the vibration control performance of a ring-stiffened cylindrical shell structure.
• To integrate advanced flexible piezoelectric actuators (Macro-Fiber Composite - MFC) for enhanced control.
• To validate the effectiveness of an optimally designed controller through simulation and experimentation.

Main Methods:

• Finite element method (FEM) for deriving governing equations and modal analysis.
• Experimental modal testing to validate FEM results.
• Design and experimental implementation of an optimal controller.
• Time-domain experimental evaluation of vibration control performance.

Main Results:

• Modal analysis accurately predicted the dynamic characteristics of the shell structure.
• The MFC actuator effectively contributed to vibration suppression.
• Experimental vibration control performance closely matched simulation results.
• The designed optimal controller demonstrated significant vibration reduction.

Conclusions:

• The study successfully demonstrated the efficacy of MFC actuators for vibration control in ring-stiffened cylindrical shells.
• The integrated approach of FEM, modal testing, and optimal control design provides a robust framework for such systems.
• Experimental validation confirms the potential for practical applications in reducing structural vibrations.