Phase Control for Semi-active Tuned Mass Damper

Phase Control for Semi-active Tuned Mass Damper

The present study aims at proposing the phase control for semi-active tuned mass damper(SATMD). At first, the phase control algorithm is developed. The principle of phase control is to apply the control force at specific moments to slow down the mass block velocity and bring the TMD back to the 90° phase lag(-90° phase deviation). Thus, the SATMD has the maximum power flow to reduce the structural vibration. Then the SATMD and optimal passive tuned mass damper(PTMD) are, respectively, implemented on the structure of Taipei 101 which is simplified to single degree of freedom structure subjected to the sinusoidal wind force and design wind force. The numerical simulation results shows that by the phase control, the SATMD can bring the mass block movement back to close to 90° phase lag under excitations of different frequencies. The SATMD with phase control not only has better performance than the optimal PTMD, but also improves the robustness. Therefore, even though the SATMD is off-tuned to the structure, it has well performance to suppress the structural vibration.