Research On Structural Control Technologies Using Regenerative Energy Hybrid Mass Damper

The basic starting points of this paper are the reliability of the vibration control system fro super-tall buildings and the collection and utilization of the structural vibration energy. The power network may fail in extreme hazards, such as earthquakes and strong winds. The dependence on power network of Active Mass Damper (AMD) system makes it unreliable. On the other hand, Tuned Mass Damper (TMD) can only dissipate the structural vibration energy.Focusing on the above problems, this paper proposed a structural control solution using an innovational energy-storage actuator. First, based on the electromagnetic damping mechanism, the AMD system is retrofit to be able to act as a TMD system. Then, utilizing the power generation function of the motor in AMD, the control system is retrofit to convert the structural vibration energy to electric energy. Thus, the functions of the innovational control system includes: 1. By switching to the TMD mode based on the electromagnetic damping, the control system converts the structural vibration energy to electric energy, then the electric energy can be dissipated to heat, or stored in battery for utilization; 2. The battery can be charged continuously under wind induced structural vibration. When the battery is charged up, the control system can be switched to AMD mode to control the structure with better effectiveness. 3. For strong structural vibration, switch the control system to AMD mode, using both the power from the battery and the power network, which can reduce the dependence on the power network and increase the reliability greatly.The electromagnetic damper is the fundamental components of the innovational actuator. The theoretical formulations of the electromagnetic damper composed of a brushless DC motor are derived and the control method of the electromagnetic damper is analyzed. The theoretical formulations are verified with the simulation results.Finally, system model of a single-DOF structure appending an ED-TMD on the top floor is built. The dimensionless dynamic magnification factor of the system is derived. Considering the dynamic magnification factor of an undamped structure under sinusoidal excitation as the optimization objective, the influence law to optimal frequency ratio and optimal damping ratio of the equivalent ED-TMD mass is studied. The influence law is provided in tabular form, which establishes the theoretical foundation for the application of ED-TMD.