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Performance of a guideway seismic isolator with magnetic springs for precision machinery / George C. Yao in Earthquake engineering structural dynamics, Vol. 38 N°2 (Février 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N°2 (Février 2009) . - pp. 181-203 Titre : Performance of a guideway seismic isolator with magnetic springs for precision machinery Type de document : texte imprimé Auteurs : George C. Yao, Auteur ; Wen-Chun Huang, Auteur Article en page(s) : pp. 181-203 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Magnetic  spring;  Guideway  isolator;  Magnet;  Repulsion;  Precision  machinery  protection Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper proposes the use of the nonlinear restoring force in an isolation system to improve the performance of a seismic isolator. Nonlinear magnetic springs applied to guideway sliding isolators (GSI) that protect precision machinery against seismic motion were studied. The magnetic springs use a non-contact magnetic repulsion force to achieve a nonlinear property. A numerical simulation model of the GSI system using step-by-step integration in the time domain was developed. A full-scale shaking table test was performed to verify the accuracy of the numerical model. Simulation and experimental results show that the GSI system with magnetic springs has good performance when subjected to floor vibrations during earthquakes. A parametric analysis of the magnetic springs in the GSI system under seismic motion was theoretically investigated. It was found that sufficient magnetic forces can diminish the system relative displacements. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121397336/abstract [article] Performance of a guideway seismic isolator with magnetic springs for precision machinery [texte imprimé] / George C. Yao, Auteur ; Wen-Chun Huang, Auteur . - pp. 181-203. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°2 (Février 2009) . - pp. 181-203 Mots-clés : Magnetic  spring;  Guideway  isolator;  Magnet;  Repulsion;  Precision  machinery  protection Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper proposes the use of the nonlinear restoring force in an isolation system to improve the performance of a seismic isolator. Nonlinear magnetic springs applied to guideway sliding isolators (GSI) that protect precision machinery against seismic motion were studied. The magnetic springs use a non-contact magnetic repulsion force to achieve a nonlinear property. A numerical simulation model of the GSI system using step-by-step integration in the time domain was developed. A full-scale shaking table test was performed to verify the accuracy of the numerical model. Simulation and experimental results show that the GSI system with magnetic springs has good performance when subjected to floor vibrations during earthquakes. A parametric analysis of the magnetic springs in the GSI system under seismic motion was theoretically investigated. It was found that sufficient magnetic forces can diminish the system relative displacements. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121397336/abstract