Passive mass-added damper Precaution against wind-induced vibrations installed on the top floor of a building Advantages Effective in reducing even small vibrations due to wind as it has very low friction. Addition of a mass enables tuning of the vibration period of the building in horizontal directions. The height of the device is less than similar systems such as the simple pendulum. Structure Roller bearing Roller bearing section consists of upper and lower arc-shaped rails and rollers. To ensure the operation of rollers, a rack and pinion is used. Additional mass Additional mass is provides working force to reduce building vibration. Viscous fluid damper Viscous fluid damper dissipates kinetic energy of the additional mass as thermal energy, to enhance vibration control. Function During an earthquake or strong wind, every building shakes at its own natural period depending on its rigidity and size. TMD-RP and AMD move so that the additional mass of the vibration control system offsets the motion of the building to absorb vibration energy. Active Mass-added Damper Active vibration control system using a computer to control the shaking of building. Advantages It provides a wide range of vibration control using an effective control system. It is failsafe as it functions as a passive vibration control system if the drive unit is overloaded or power fails. Structure OILES AMD, based on a passive vibration control system (TMD-RP) using a roller pendulum, is operated by the drive unit and control system. Analysis of earthquake response