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...
Main Authors: | , , , , |
---|---|
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 |
_version_ | 1797989113752715264 |
---|---|
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. |
first_indexed | 2024-04-11T08:15:05Z |
format | Article |
id | doaj.art-a90b0f1f94604145b0a4332802e134e8 |
institution | Directory Open Access Journal |
issn | 2187-9761 |
language | Japanese |
last_indexed | 2024-04-11T08:15:05Z |
publishDate | 2018-05-01 |
publisher | The Japan Society of Mechanical Engineers |
record_format | Article |
series | Nihon Kikai Gakkai ronbunshu |
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 AT eijisato developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation AT manabuyamada developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation AT koichikajiwara developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation AT masakihayatsu developmentofthreedimensionalseismicisolationsystemrealizinghorizontalperiodicitybyairlevitation |