プロペラを用いた空気圧浮揚の免震装置

抄録

In recent years, studies of the air-floating seismic isolator have been conducted. In these methods, an air compressor is used to supply compressed air to the gap between the seismic isolator and base. When a house should be floated, we do not have to care about space for an air compressor. However, when a work of art or a small precision apparatus should be floated, an air compressor is too large for the seismic isolator. Therefore, we propose a seismic isolator using propellers instead of an air compressor. Four motors and four propellers are used in the proposed seismic isolator. Motors rotate propellers and air is supplied to the duct where air is held in. Then, pressure in the duct increases and the proposed seismic isolator floats like a hovercraft. In order to theoretically determine the relationship between the propeller speed and pressure in the duct, Bernoulli's theorem and equation of continuity are used based on the aerodynamics of the propeller when the propeller and base are far apart. The theoretically derived floating force of the seismic isolator was validated through simulations and experiments. The effectiveness of the proposed seismic isolator was verified through experiments using sine and seismic waves.