著者
長﨑 陽 鎌田 弦 刀 友基 佐々木 修平 宮城 大輔 津田 理
出版者
公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
雑誌
低温工学 (ISSN:03892441)
巻号頁・発行日
vol.55, no.2, pp.117-124, 2020-03-20 (Released:2020-03-27)
参考文献数
12

This paper discusses the demonstration of a stable levitation (SL) system for a magnetic levitation type seismic isolation device using a high-temperature superconducting (HTS) bulk. The SL system utilizes a restoring force between an HTS bulk and permanent magnet (PM) to maintain the stable levitation of a base-isolation object. We first measured the restoring force between the HTS bulk and PM, and then demonstrated the performance of the SL system using a magnetic levitation type seismic isolation model device with a radial arrangement of HTS bulks and a PM rail. The SL system with the HTS bulk can reduce small vibration and displacement during the normal period of operation without experiencing a large disturbance. We also demonstrated that, when a large disturbance was applied, the transmission of horizontal vibration to the base-isolation object via the SL system was eliminated by decoupling the magnetic coupling between the HTS bulk and PM. Furthermore, the vibration transmissibility at any vibration frequency to the base-isolation object was reduced by incorporating an HTS bulk damper and eddy current damper in the model device. These results suggest that a SL system used together with an HTS bulk can realize both the stable levitation of a base-isolation object during the normal period of operation as well as the elimination of the horizontal vibration transmission when a large vibration is applied.
著者
佐々木 修平
出版者
八戸工業高等専門学校
雑誌
若手研究(B)
巻号頁・発行日
2015-04-01

超電導バルク体を用いた磁気浮上型免震装置の実用化に向けて,免震対象物の許容重量となる磁気浮上力,鉛直振動伝達の抑制が重要な課題となる。本課題研究期間において,永久磁石の配列方法や,磁性体を用いた磁束密度操作によって磁気浮上力の向上を図り,一般家屋を磁気支持できるレベルに到達することができた。さらに,モデル装置を用いて鉛直振動伝達特性について検討を行い,超電導バルク体に超電導線材コイルを取り付けることで鉛直振動伝達を抑えることに成功した。