Equivalent linearized mechanical model for tuned liquid dampers of arbitrary tank shape / Love, J. S. in Transactions of the ASME . Journal of fluids engineering, Vol. 133 N° 6 (Juin 2011)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 133 N° 6 (Juin 2011) . - 09 p. Titre : Equivalent linearized mechanical model for tuned liquid dampers of arbitrary tank shape Type de document : texte imprimé Auteurs : Love, J. S., Auteur ; Michael J. Tait, Auteur Année de publication : 2011 Article en page(s) : 09 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Computational fluid dynamics Finite element analysis Hydrodynamics Shock absorbers Sloshing Vibration control Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper presents a model to describe the behavior of sloshing in a general tank with a uniform fluid depth. An equivalent linearized mechanical model is developed for a tuned liquid damper (TLD) with arbitrary tank geometry. The finite element method is employed to determine the mode shapes of the sloshing fluid. In general, the mode shapes of arbitrary tanks will have response components in the x- and y-directions. The mode shapes enable the generalized properties of the sloshing fluid to be determined; these properties are subsequently used to establish equivalent mechanical properties. The nonlinear damping of slat-type damping screens is linearized, permitting it to be included in the model as amplitude-dependent viscous damping. The proposed model is in excellent agreement with existing linearized models for the special cases of rectangular and circular tanks. Sinusoidal shake table tests are conducted on tanks with chamfers placed in selected corners. In the literature, no experimental testing has focused on tanks of arbitrary shape with a constant fluid depth. The proposed model is in good agreement with the experimental results for the mode dominated by motion in the direction of excitation. However, the model is found to underestimate the response of the mode which is dominated by motion perpendicular to the excitation direction. The linearized mechanical model developed can serve as a useful preliminary TLD design tool. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] [article] Equivalent linearized mechanical model for tuned liquid dampers of arbitrary tank shape [texte imprimé] / Love, J. S., Auteur ; Michael J. Tait, Auteur . - 2011 . - 09 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 6 (Juin 2011) . - 09 p. Mots-clés : Computational fluid dynamics Finite element analysis Hydrodynamics Shock absorbers Sloshing Vibration control Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper presents a model to describe the behavior of sloshing in a general tank with a uniform fluid depth. An equivalent linearized mechanical model is developed for a tuned liquid damper (TLD) with arbitrary tank geometry. The finite element method is employed to determine the mode shapes of the sloshing fluid. In general, the mode shapes of arbitrary tanks will have response components in the x- and y-directions. The mode shapes enable the generalized properties of the sloshing fluid to be determined; these properties are subsequently used to establish equivalent mechanical properties. The nonlinear damping of slat-type damping screens is linearized, permitting it to be included in the model as amplitude-dependent viscous damping. The proposed model is in excellent agreement with existing linearized models for the special cases of rectangular and circular tanks. Sinusoidal shake table tests are conducted on tanks with chamfers placed in selected corners. In the literature, no experimental testing has focused on tanks of arbitrary shape with a constant fluid depth. The proposed model is in good agreement with the experimental results for the mode dominated by motion in the direction of excitation. However, the model is found to underestimate the response of the mode which is dominated by motion perpendicular to the excitation direction. The linearized mechanical model developed can serve as a useful preliminary TLD design tool. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...]

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Performance of tuned liquid dampers / Michael J. Tait in Journal of engineering mechanics, Vol. 134 N°5 (Mai 2008)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 134 N°5 (Mai 2008) . - pp. 417–427. Titre : Performance of tuned liquid dampers Type de document : texte imprimé Auteurs : Michael J. Tait, Auteur ; N. Isyumov, Auteur ; A. A. El Damatty, Auteur Année de publication : 2008 Article en page(s) : pp. 417–427. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Structural dynamics control Damping Passive Vibration Sloshing Résumé : This paper investigates the performance of unidirectional and bidirectional tuned liquid dampers (TLDs) under random excitation. The performance of the tuned liquid dampers is measured in terms of efficiency and robustness. A series of experimental tests are conducted on model scale structure-tuned liquid damper systems to evaluate their performance, which is then compared to that of the well known tuned mass damper. The effective damping is calculated for each test conducted and the efficiency and robustness are subsequently examined. The performance of a mistuned TLD is experimentally investigated to highlight the robustness of these passive dynamic vibration absorbers. A nonlinear numerical model is used to conduct an extensive parametric study on the performance of a tuned liquid damper. This study has resulted in the development of performance charts for a tuned liquid damper. These charts allow the efficiency of a tuned liquid damper to be examined for a number of varying parameters, which include the excitation amplitude, water depth, and building frequency. These charts are particularly useful for the initial design of a tuned liquid damper when the precise frequency of the structure is not known. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A5%2841 [...] [article] Performance of tuned liquid dampers [texte imprimé] / Michael J. Tait, Auteur ; N. Isyumov, Auteur ; A. A. El Damatty, Auteur . - 2008 . - pp. 417–427. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N°5 (Mai 2008) . - pp. 417–427. Mots-clés : Structural dynamics control Damping Passive Vibration Sloshing Résumé : This paper investigates the performance of unidirectional and bidirectional tuned liquid dampers (TLDs) under random excitation. The performance of the tuned liquid dampers is measured in terms of efficiency and robustness. A series of experimental tests are conducted on model scale structure-tuned liquid damper systems to evaluate their performance, which is then compared to that of the well known tuned mass damper. The effective damping is calculated for each test conducted and the efficiency and robustness are subsequently examined. The performance of a mistuned TLD is experimentally investigated to highlight the robustness of these passive dynamic vibration absorbers. A nonlinear numerical model is used to conduct an extensive parametric study on the performance of a tuned liquid damper. This study has resulted in the development of performance charts for a tuned liquid damper. These charts allow the efficiency of a tuned liquid damper to be examined for a number of varying parameters, which include the excitation amplitude, water depth, and building frequency. These charts are particularly useful for the initial design of a tuned liquid damper when the precise frequency of the structure is not known. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A5%2841 [...]

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Shake table study on an ordinary low-rise building seismically isolated with SU-FREIs (stable unbonded-fiber reinforced elastomeric isolators) / Hamid Toopchi-Nezhad in Earthquake engineering structural dynamics, Vol. 38 N° 11 (Septembre 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1335-1357 Titre : Shake table study on an ordinary low-rise building seismically isolated with SU-FREIs (stable unbonded-fiber reinforced elastomeric isolators) Type de document : texte imprimé Auteurs : Hamid Toopchi-Nezhad, Auteur ; Michael J. Tait, Auteur ; Drysdale, Robert G., Auteur Article en page(s) : pp. 1335-1357 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Fiber reinforced elastomeric isolators  Unbonded application  Shake table testing  Base isolation  seismic mitigation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper reports on the investigation of novel fiber reinforced elastomeric isolator (FREI) bearings, which do not have thick end plates, and are used in an unbonded application. Owing to the stable lateral load-displacement response exhibited by the unbonded FREI bearings, the proposed bearings are referred to as stable unbonded (SU)-FREIs. A shake table test program was conducted on a two-story test-structure having well-defined elastic response characteristics. Compared with the results for the corresponding fixed base (FB) structure, the peak response values, distribution of lateral response throughout the height of the structure, and response time histories of the tested base isolated (BI) structure indicate that significantly improved response can be achieved. This study clearly indicates that SU-FREI bearings can provide an effective seismic isolation system. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Shake table study on an ordinary low-rise building seismically isolated with SU-FREIs (stable unbonded-fiber reinforced elastomeric isolators) [texte imprimé] / Hamid Toopchi-Nezhad, Auteur ; Michael J. Tait, Auteur ; Drysdale, Robert G., Auteur . - pp. 1335-1357. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1335-1357 Mots-clés : Fiber reinforced elastomeric isolators  Unbonded application  Shake table testing  Base isolation  seismic mitigation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper reports on the investigation of novel fiber reinforced elastomeric isolator (FREI) bearings, which do not have thick end plates, and are used in an unbonded application. Owing to the stable lateral load-displacement response exhibited by the unbonded FREI bearings, the proposed bearings are referred to as stable unbonded (SU)-FREIs. A shake table test program was conducted on a two-story test-structure having well-defined elastic response characteristics. Compared with the results for the corresponding fixed base (FB) structure, the peak response values, distribution of lateral response throughout the height of the structure, and response time histories of the tested base isolated (BI) structure indicate that significantly improved response can be achieved. This study clearly indicates that SU-FREI bearings can provide an effective seismic isolation system. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe

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