Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation

Research on seismic isolation technology was also a question of how much restoring force can be reduced. The seismic isolation rubber with thin film like rubber and metal plates stacked in multiple stages to reduce the restoring force has achieved great success. However, there still exists restoring...

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Main Authors: Masashi YASUDA, Eiji SATO, Manabu YAMADA, Koichi KAJIWARA, Masaki HAYATSU
Format: Article
Language:Japanese
Published: The Japan Society of Mechanical Engineers 2018-05-01
Series:Nihon Kikai Gakkai ronbunshu
Subjects:
Online Access:https://www.jstage.jst.go.jp/article/transjsme/84/861/84_17-00509/_pdf/-char/en
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author Masashi YASUDA
Eiji SATO
Manabu YAMADA
Koichi KAJIWARA
Masaki HAYATSU
author_facet Masashi YASUDA
Eiji SATO
Manabu YAMADA
Koichi KAJIWARA
Masaki HAYATSU
author_sort Masashi YASUDA
collection DOAJ
description Research on seismic isolation technology was also a question of how much restoring force can be reduced. The seismic isolation rubber with thin film like rubber and metal plates stacked in multiple stages to reduce the restoring force has achieved great success. However, there still exists restoring power, measures against long-period earthquakes are not perfect and vertically unprotected. This research is an effort to make three-dimensional seismic isolation more realistic with higher performance by further minimizing resilience in all directions. The developed three-dimensional seismic isolation mechanism consists of an air levitation mechanism that isolates horizontal vibration and a spring link mechanism that isolates vertical vibration. Excitation experiments of the prototype were carried out using real-scale three-dimensional seismic waves by the E-defense shaking table. As a result, excellent characteristics of horizontal periodicity and vertical natural period of 5 s were confirmed. The vibration isolation performance at 1 Hz was about 20 dB in all three directions, and the high isolation performance not found in conventional equipment was verified. They were also supported by analytical models.
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spelling doaj.art-a90b0f1f94604145b0a4332802e134e82022-12-22T04:35:11ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612018-05-018486117-0050917-0050910.1299/transjsme.17-00509transjsmeDevelopment of three-dimensional seismic isolation system realizing horizontal periodicity by air levitationMasashi YASUDA0Eiji SATO1Manabu YAMADA2Koichi KAJIWARA3Masaki HAYATSU4Setsunan Univ. Dept. of Mechanical and EngineeringNational Research Institute for Earth Science and Disaster PreventionHitachi, Ltd.National Research Institute for Earth Science and Disaster PreventionHitachi, Ltd.Research on seismic isolation technology was also a question of how much restoring force can be reduced. The seismic isolation rubber with thin film like rubber and metal plates stacked in multiple stages to reduce the restoring force has achieved great success. However, there still exists restoring power, measures against long-period earthquakes are not perfect and vertically unprotected. This research is an effort to make three-dimensional seismic isolation more realistic with higher performance by further minimizing resilience in all directions. The developed three-dimensional seismic isolation mechanism consists of an air levitation mechanism that isolates horizontal vibration and a spring link mechanism that isolates vertical vibration. Excitation experiments of the prototype were carried out using real-scale three-dimensional seismic waves by the E-defense shaking table. As a result, excellent characteristics of horizontal periodicity and vertical natural period of 5 s were confirmed. The vibration isolation performance at 1 Hz was about 20 dB in all three directions, and the high isolation performance not found in conventional equipment was verified. They were also supported by analytical models.https://www.jstage.jst.go.jp/article/transjsme/84/861/84_17-00509/_pdf/-char/enearthquakethree dimensional seismic isolationair levitationnegative stiffness
spellingShingle Masashi YASUDA
Eiji SATO
Manabu YAMADA
Koichi KAJIWARA
Masaki HAYATSU
Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation
Nihon Kikai Gakkai ronbunshu
earthquake
three dimensional seismic isolation
air levitation
negative stiffness
title Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation
title_full Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation
title_fullStr Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation
title_full_unstemmed Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation
title_short Development of three-dimensional seismic isolation system realizing horizontal periodicity by air levitation
title_sort development of three dimensional seismic isolation system realizing horizontal periodicity by air levitation
topic earthquake
three dimensional seismic isolation
air levitation
negative stiffness
url https://www.jstage.jst.go.jp/article/transjsme/84/861/84_17-00509/_pdf/-char/en
work_keys_str_mv AT masashiyasuda developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation
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AT manabuyamada developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation
AT koichikajiwara developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation
AT masakihayatsu developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation