Proposal of Semi‐Active Controlled Tuned Mass Damper Adaptable to a Structure's Period Fluctuation

ABSTRACT This paper proposes a semi‐actively controlled tuned mass damper (TMD) that is adaptable to the period fluctuation of the target structure. This TMD consists of two linear springs in series and a semi‐active variable damper. The resonance frequency of the system can be controlled by changing the damping coefficient of the variable damper. The tuning mechanism is elucidated using a complex stiffness model, and a simple method is proposed for determining the system parameters. The performance of the proposed TMD is compared with those of conventional systems including multiple TMDs by employing random vibration theory and time domain analyses, and the results confirm its feasibility and potential capability.