Performance Evaluation of Motorized Variable Stiffness Vertical Seismic Isolator

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  • モータを備えた可変剛性鉛直免震装置の性能評価

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<p>In recent years, various seismic isolation devices have been developed to prevent damage from earthquakes. In this study, we focused on vertical seismic isolation and proposed a vertical seismic isolation device with three link-crank mechanisms arranged in a star shape. In this seismic isolation device, a motor is used to change the spring anchorage conditions, adjusting the rigidity characteristics of the device and allowing the resonance point to be manipulated. We took advantage of this feature to achieve resonance avoidance to escape from the resonance state. As a result of making common adjustments to all link and crank mechanisms, we were able to avoid resonance by reducing acceleration by 30% from before resonance avoidance, but it took approximately 20 seconds of motor operation to suppress transient vibration generated by the change in equilibrium position during avoidance. By adjusting the linkage and crank mechanism to prevent transient vibration, we were able to shorten the motor operation to 0.3 seconds.</p>

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