Parametric Study on the Dynamic Characteristics of a Coupled Tower-Cable System Controlled by an MRE Damper

Key Points

• The research aims to investigate effective vibration reduction strategies for a coupled tower-cable system controlled by MRE dampers.
• Applied the Galerkin method to derive the coupled motion equations of the tower and cable system.
• Defined mass ratio and frequency ratio as key dimensionless parameters for system behavior analysis.
• Conducted comprehensive parametric studies to identify modal exchange phenomena and natural frequency variations.
• Simulated the nonlinear hysteretic behavior of MRE dampers using the Bouc-Wen model for time history analysis.
• Compared performance of four control strategies under resonant and white noise conditions.
• Identified significant modal access phenomena associated with changes in natural frequencies and mode shapes.
• Presented optimal passive damper design charts illustrating maximum damping ratios and optimal placement based on mass and frequency ratios.
• Demonstrated that LQR-based semi-active control provides better adaptability and vibration reduction performance compared to passive modes under irregular loading conditions.

Abstract