Relevant bibliographies by topics / Isolatori elastomerici

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Isolatori elastomerici'

Author: Grafiati
Published: 4 June 2021
Last updated: 22 February 2023

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Journal articles on the topic "Isolatori elastomerici"

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Pauletta, Margherita, Federico Pinzano, Giada Frappa, and Gaetano Russo. "Tensile Tests for the Improvement of Adhesion between Rubber and Steel Layers in Elastomeric Isolators." Applied Sciences 10, no. 22 (November 13, 2020): 8063. http://dx.doi.org/10.3390/app10228063.

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Steel reinforced elastomeric isolators are currently the most used bearings for seismic isolation purposes. The steel reinforcements are cut to the desired shape, sandblasted, cleaned with acid, and coated with bonding compound during the manufacturing process. Then the elastomer and steel layers are stacked in a mold and subjected to vulcanization so that they are glued together and constitute a single body. Good adhesion between the layers is very important for the correct functioning of the device. Adhesion conditions become critical when the isolators are subjected to tensile stresses, which arise under direct tensile actions or large shear strains. To analyze the influence of changes in the manufacturing process on the isolator adhesive behavior, the authors performed tensile tests on square-shaped small-scale specimens rather than expensive shear tests on full-scale isolators. Hence, the adhesion behavior between elastomer and steel layers was investigated through the tensile tests discussed herein. Among the influencing parameters that were considered, it was found that an increase in vulcanization time does not improve the adhesion, but it may actually worsen the capacity of the isolator in terms of strength. Moreover, it was found that using elastomer without an oily component improves the adhesion between the layers and increases the isolator’s dissipative capacity.
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Ngo, Van Thuyet. "Effect of shear modulus on the performance of prototype un-bonded fiber reinforced elastomeric isolators." Journal of Science and Technology in Civil Engineering (STCE) - NUCE 12, no. 5 (August 30, 2018): 10–19. http://dx.doi.org/10.31814/stce.nuce2018-12(5)-02.

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Un-bonded fiber reinforced elastomeric isolator (U-FREI) is light weight and facilitates easier installation in comparison to conventional steel reinforced elastomeric isolators (SREI), in which fiber layers are used as reinforcement to replace steel shims as are normally used in conventional isolators. Shear modulus of elastomer has significant influence on the force-displacement relationship of U-FREI. However, a few studies investigated the effect of shear modulus on the horizontal behavior of prototype U-FREI in literature. In this study, effect of shear modulus on performance of prototype U-FREIs is investigated by both experiment and finite element (FE) analysis. It is observed that reduction in horizontal stiffness of U-FREI with increasing horizontal displacement is due to both rollover deformation (or reduction in contact area of isolator with supports) and shear modulus of elastomer. Reasonable agreement is observed between the findings from experiment and FE analysis. Keywords: base isolator; prototype un-bonded fiber reinforced elastomeric isolator; rollover deformation; shear modulus; cyclic test.
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Kelly, James M. "Seismic Isolation Systems for Developing Countries." Earthquake Spectra 18, no. 3 (August 2002): 385–406. http://dx.doi.org/10.1193/1.1503339.

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This paper describes an experimental and theoretical study of the feasibility of using fiber reinforcement to produce lightweight low-cost elastomeric isolators for application to housing, schools and other public buildings in highly seismic areas of the developing world. The theoretical analysis covers the mechanical characteristics of multi-layer elastomeric isolation bearings where the reinforcing elements, normally steel plates, are replaced by a fiber reinforcement. The fiber in the fiber-reinforced isolator, in contrast to the steel in the conventional isolator (which is assumed to be rigid both in extension and flexure), is assumed to be flexible in extension, but completely without flexure rigidity. This leads to an extension of the theoretical analysis on which the design of steel-reinforced isolators is which accommodates the stretching of the fiber-reinforcement. Several examples of isolators in the form of long strips were tested at the Earthquake Engineering Research Center Laboratory. The tested isolators had significantly large shape factors, large enough that for conventional isolators the effects of material compressibility would need to be included. The theoretical analysis is extended to include compressibility and the competing influences of reinforcement flexibility and compressibility are studied. The theoretical analysis suggests and the test results confirm that it is possible to produce a fiber-reinforced strip isolator that matches the behavior of a steel-reinforced isolator. The fiber-reinforced isolator is significantly lighter and can be made by a much less labor-intensive manufacturing process. The advantage of the strip isolator is that it can be easily used in buildings with masonry walls. The intention of this research is to provide a low-cost lightweight isolation system for housing and public buildings in developing countries.
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Mkrtychev, Oleg. "Numerical studies of elastomeric isolator performance under static loads." MATEC Web of Conferences 251 (2018): 02022. http://dx.doi.org/10.1051/matecconf/201825102022.

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The article presents the studies of the elastomeric isolator performance under static loads. The solutions of the problems have been obtained by means of a specialized software complex by direct integration of the motion equations according to the implicit scheme. For calculation of the elastomeric isolator, a 3D computational model comprised by solid finite elements has been used. Based on the results of the studies performed, the diagrams for displacement of the points of the top of the support have been plotted with the horizontal shear of the support. The possibility of formation of tilting in the upper plate of the elastomeric isolator has been proved. The diagram of residual horizontal displacements of the support after the horizontal load removal has been obtained. The inability of elastomeric isolators to return independently to the initial equilibrium position without additional devices has been proved.
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Imbimbo, Maura, and James M. Kelly. "Stability Aspects of Elastomeric Isolators." Earthquake Spectra 13, no. 3 (August 1997): 431–49. http://dx.doi.org/10.1193/1.1585956.

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The theoretical analysis for the buckling of isolators is well known and has generally been verified by experimental work, but there are some aspects of the analysis that have not been addressed in detail. This paper will study two examples, first the effect of end plate rotation on the buckling load and, secondly, the buckling of an isolator that is made up of two bearings, one on the top of the others. The effect of end plate rotation on the buckling load arises in situations where the stiffness of the superstructure is not high enough to ensure that the isolator is constrained against rotation at the top; this is often the case when retrofitting existing structures. The influence of the flexibility of the superstructure on the horizontal stiffness of the isolator and the reduction of the critical load due to this flexibility is evaluated in the paper. The results show a significant reduction of the critical load. The second analysis presented in the paper models the buckling of a composite isolator that is made up of two bearings, one on top of the other. Two approaches for evaluating the critical load of this composite isolator are discussed, and an approximate method is developed that provides results close to the complete solution.
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Kamrava, Alireza. "Seismic Isolators and their Types." Current World Environment 10, Special-Issue1 (June 28, 2015): 27–32. http://dx.doi.org/10.12944/cwe.10.special-issue1.05.

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In this paper I would like to describe about what seismic isolation is., seismic isolators, their types ,how do they work? ,their advantage and disadvantage. In seismic isolator types you will read about Elastomeric bearings, Natural and Synthetic Rubber Bearings , Lead Rubber Bearings , Friction pendulum bearing, Supplymetal Damping Devices like Buckling Restrained Brace, Fluid Dampers, Visco-Elastic Dampers,Friction Dampers, Hysteretic Dampers(Yeilding Dampers).In advantage and disadvantage part you will read some tips about using seismic isolators. In conclusion you will read a review about seismic isolation and using seismic isolators.
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Mondal, Papiya D., Aparna D. Ghosh, and Subrata Chakraborty. "Performances of Various Base Isolation Systems in Mitigation of Structural Vibration Due to Underground Blast Induced Ground Motion." International Journal of Structural Stability and Dynamics 17, no. 04 (April 6, 2017): 1750043. http://dx.doi.org/10.1142/s0219455417500432.

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A comparative study is carried out on the performance of various elastomeric and frictional base isolation (BI) systems in the vibration mitigation of structures subjected to underground blast induced ground motion (BIGM). The parametric sensitivities of the base isolated structures to variations in the design parameters of the isolators are examined for different intensities of blast input. Results indicate that substantial reductions in both the acceleration and displacement responses of the structure can be achieved by the different base isolators. Generally, the Electricite de France (EDF) base isolator produces higher peak response reductions. However, peak bearing displacements are also largest here. The pure friction (P-F), resilient-friction base isolator (R-FBI) and friction pendulum (FP) systems produce lower values of response reductions but peak bearing displacements as well as residual displacements of isolators are also low. The New Zealand (N-Z) system provides good response reductions with a low to moderate value of peak bearing displacement. The present study indicates how a proper selection of the type of BI system with suitable design parameters can mitigate structural vibration due to different intensities of BIGM and restrict the unwanted characteristics of large isolator displacement and its permanent deformation.
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Imbimbo, Maura, and James M. Kelly. "Stability of Isolators at Large Horizontal Displacements." Earthquake Spectra 13, no. 3 (August 1997): 415–30. http://dx.doi.org/10.1193/1.1585955.

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Elastomeric bearings used as seismic isolators are susceptible to a buckling type of instability similar to that of structural columns. The buckling load and buckling behaviour can be determined from an elastic analysis of the isolator modelled as a continuous composite column with bending and shear flexibility; this analysis cannot be used, however, to assess the post-buckling behaviour or the stability of the isolator at large horizontal displacements. By using a two-spring rigid link model that considers large angles without using linear approximations, it is possible to predict the post-buckling behaviour of an isolator. Using the simple closed form expression, this paper will model three aspects of post-buckled isolator behaviour: the dependence of horizontal stiffness on vertical load, the stability at large horizontal displacements, and the increase of horizontal displacement with respect to axial load and vertical displacement.
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Zhang, H., J. Li, and T. Peng. "Development and Mechanical Performance of a New Kind of Bridge Seismic Isolator for Low Seismic Regions." Shock and Vibration 20, no. 4 (2013): 725–35. http://dx.doi.org/10.1155/2013/148907.

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The concept of fibre-reinforced plate elastomeric isolator (FRPEI) is introduced firstly in this paper. Three FRPEI specimens have been constructed to evaluate the mechanical performance of the isolators by performing vertical and horizontal tests. The research focuses on the compression stiffness, the shear stiffness, the hysteretic characteristic and the vertical bearing capacity of the isolators. The experimental results show that the mechanical performance of FRPEIs can meet the requirements of bridge rubber bearings and the energy dissipation capacity is better than that of general laminated rubber bearings. Therefore, it is feasible to use FRPEIs in seismic isolation of short span bridges in low seismic regions. Theoretical and finite element methods have also been employed and the deformation assumptions applied in the theoretical method are also verified by FEM. By comparing the differences of the results of different methods, the effectivenesses of the theoretical and finite element methods are evaluated and some considerations on isolator design are proposed.
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Elahinia, Mohammad, Constantin Ciocanel, The M. Nguyen, and Shuo Wang. "MR- and ER-Based Semiactive Engine Mounts: A Review." Smart Materials Research 2013 (February 20, 2013): 1–21. http://dx.doi.org/10.1155/2013/831017.

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Hybrid propulsion technologies, including hybrid electric and hydraulic hybrid, equip vehicles with nonconventional power sources (in addition to the internal combustion engine) to provide higher fuel efficiency. However, these technologies tend to lead to higher levels of noise, vibration, and harshness in the vehicles, mainly due to the switching between the multiple power sources involved. In addition, the shocks and vibrations associated with the power sources switching may occur over a wide range of frequencies. It has been proven that passive vibration isolators (e.g., elastomeric and hydraulic mounts) are unable to mitigate or totally isolate such shocks and vibrations. Active mounts, while effective, are more complex, require significant power to operate, and can lead to system instabilities. Semiactive vibration isolators have been shown to be as effective as active mounts while being less complex and requiring less power to operate. This paper presents a review of novel semiactive shock and vibration isolators developed using magnetorheological and electrorheological fluids. These fluids change their yield stress in response to an externally applied magnetic and electric field, respectively. As a result, these fluids allow one to transform a passive hydraulic vibration isolator into a semiactive device.
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Dissertations / Theses on the topic "Isolatori elastomerici"

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Palma, Pietro Maria. "Adeguamento sismico di ponti esistenti mediante l’inserimento di isolatori elastomerici." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Il presente lavoro è stato organizzato analizzando separatamente due tematiche complementari inerenti la sismica dei ponti a travata continua. In particolare, la prima parte (Parte A) verte sull'adeguamento sismico di ponti esistenti in cui, a partire dalla soluzione tradizione (non adeguata), sono state ricercate soluzioni di adeguamento mediante l’utilizzo dei più diffusi dispositivi di protezione sismica presenti in commercio. La seconda parte (Parte B), invece, verte sull'applicazione di una metodologia specifica di adeguamento, quella basata sull'utilizzo di isolatori elastomerici, applicata ad un Caso Studio frutto della collaborazione del consorzio ReLUIS con L’Università di Bologna.
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Zampini, Niccolò. "Adeguamento sismico di ponti esistenti mediante inserimento di isolatori elastomerici e smorzatori viscosi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Il presente lavoro di tesi riguarda lo studio dell’adeguamento sismico di ponti esistenti a travata continua. La prima parte (Parte A) affronta lo studio dello schema di vincolo tradizionale (non adeguato) dei ponti esistenti per poi formulare, a partire da questo, soluzioni di adeguamento con l’utilizzo di dispositivi di protezione sismica in commercio. La seconda parte (Parte B), invece, verte sull'applicazione di specifiche soluzioni di adeguamento, al Caso Studio oggetto del progetto di ricerca “Contributi normativi relativi a Isolamento e Dissipazione” della Reluis. È stato dunque studiato il Caso Studio con diverse soluzioni di vincolo le quali prevedono sia l’utilizzo di soli smorzatori fluido-viscosi sia l’utilizzo congiunto di isolatori elastomerici con i suddetti smorzatori. Le analisi sono state svolte sia con modelli FEM sia con modelli semplificati implementati nel software Matlab. Il presente lavoro è volto a perseguire due macro obiettivi: nella Parte A, a valle della ricerca delle soluzioni di adeguamento sismico attualmente a disposizione, si cerca di fornire ai progettisti, per ogni soluzione di adeguamento trattata, dei modelli semplificati a pochi gradi di libertà (sistemi minimi) rappresentativi, sotto determinate ipotesi, del comportamento dell’impalcato, con lo scopo di creare un supporto ordinato e di facile applicazione progettuale di interventi di miglioramento/adeguamento su ponti esistenti ma utili anche per progettazione ex novo; nella Parte B, applicando al caso studio due particolari soluzioni trattate nella prima parte, si confrontano i risultati fornendo per questo caso studio specifico le soluzioni migliori dal punto di vista di salvaguardia delle sottostrutture, inoltre si cerca di fornire una procedura per la progettazione semplificata per il dimensionamento degli isolatori, accoppiati con gli smorzatori, atta ad ottenere le caratteristiche meccaniche e geometriche da inserire poi nel programma di calcolo utilizzato.
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Rustichelli, Lorenzo. "Progetto in zona sismica di un edificio in calcestruzzo: confronto tra comportamento a base fissa e comportamento con isolamento alla base." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20300/.

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Il presente lavoro affronta lo studio di una struttura in calcestruzzo ipotetica, situata nella città di Bologna, su cui verrà effettuato un intervento tramite isolatori sismici in modo da migliorare notevolmente il comportamento della struttura sotto azione del sisma. In particolare verrà studiata in base a tre diverse condizioni: 1) Condizione 1: struttura a base fissa; 2) Condizione 2: struttura con prima proposta di isolamento alla base, con isolatori al di sotto di ogni pilastro; 3) Condizione 3: struttura con seconda proposta di isolamento alla base, con meno isolatori ma di diametro maggiore ed accoppiati a dispositivi di scorrimento tipo carrello; Dopo un ampia analisi dei tre casi precedentemente esposti, vengono messi a confronto i risultati ottenuti nelle tre situazioni precedentemente riportate, in modo da meglio comprendere i miglioramenti ed i vantaggi ottenibili tramite l’introduzione di un sistema di isolamento alla base degli edifici, nonché confrontare i costi delle strutture nelle tre diverse condizioni di isolamento.
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Monti, Diego. "Analisi del funzionamento dei dispositivi di isolamento sismico e applicazione progettuale ad un edificio in cemento armato." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8105/.

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La tesi ha l'obiettivo di studiare la tecnica di controllo passivo dell'isolamento sismico, comprenderne il funzionamento e applicarla ad un caso di studio (nello specifico un fabbricato ad uso civile abitazione costituito da 7 piani fuori terra) svolgendo le verifiche previste dal D.M. 14/01/08 e dalla Circolare 02/02/2009-
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Ardic, Halil. "Design And Modeling Elastomeric Vibration Isolators Using Finite Element Method." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615684/index.pdf.

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In this thesis, a process is developed for designing elastomeric vibration isolators in order to provide vibration isolation for sensitive equipment being used in ROKETSAN A.S.&rsquo
s products. For this purpose, first of all, similar isolators are examined in the market. After that, appropriate elastomeric materials are selected and their temperature and frequency dependent dynamic properties are experimentally obtained. Parametric finite element model of the isolator is then constituted in ANSYS APDL using the properties of elastomeric materials and the conceptual design of the isolator. Then, according to design requirements, final design parameters of the vibration isolator are determined at the end of design iterations. In the next step, vibration isolator that was designed is manufactured using the elastomeric material chosen, by a local rubber company. Finally, design process is verified by comparing analysis and test results.
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Fredette, Luke. "Dynamic Analysis of Fractionally-Damped Elastomeric and Hydraulic Vibration Isolators." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1479904009913121.

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Ramesh, Ram S. "Identification of Multi-Dimensional Elastic and Dissipation Properties of Elastomeric Vibration Isolators." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1515109658022859.

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Hedayati, Dezfuli Farshad. "Hysteretic behaviour of steel- and fibre-reinforced elastomeric isolators fitted with superelastic shape memory alloy wire." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/53019.

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Among different types of earthquake protective mechanisms, elastomeric base isolators, also called rubber bearings (RBs), are one of the most well-known systems that are widely used in buildings and bridges. They can regulate the seismic response of structures, increase the public safety, and reduce the cost of repair and rehabilitation by providing lateral flexibility and dissipating the earthquake’s energy. RBs consist of elastomeric layers which are reinforced with steel shims or fibre-reinforced polymer composites. Seeking performance improvements, as well as cost and weight reduction led scientists to introduce different types of RBs. However, most RBs possess weaknesses such as limited shear strain capacity, un-recovered residual deformation, and instability due to large deformations. Using superelastic (ability to regain original shape upon unloading) shape memory alloy (SMA) in the form of wire, bar, or spring is a solution to partially overcome the aforementioned limitations. Its unique characteristics such as a flag-shaped hysteresis with zero residual deformation, superelastic effect (up to 13.5% recoverable strain) and a suitable fatigue property make it an ideal candidate for such applications. Objectives of this thesis are to propose a new generation SMA wire-based RBs (SMA-RB) and develop a novel constitutive model for such smart isolators in order to accurately capture their shear hysteretic behaviour. With the purpose of evaluating the performance of SMA-RBs in structural applications, the seismic fragility of a highway bridge isolated by SMA-RBs was assessed. First, a number of scaled carbon fibre-reinforced elastomeric isolators (C-FREIs) were manufactured and tested. Then, based on the experimental observations, numerical simulations were generated using finite element method (FEM). Results showed that incorporating SMA wires into natural and high-damping rubber bearings (NRB, HDRB) slightly improves the re-centring capability and energy dissipation capacity. However, equipping lead rubber bearing (LRB) with double cross SMA wires significantly reduces the residual deformation and noticeably enhances the energy damping property. It was also depicted that the developed hysteresis of SMA model can be characterized by three stiffnesses and two shear strain limits upon activation of SMA wires. Findings revealed that SMA wires can increase the reliability of elastomeric bearings and bridge system.
Applied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
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Adib, Natanzi Heshmatollah. "Effect of bonding variation and component combination on dynamic characteristics of compound semi-bonded carbon fiber reinforced elastomeric isolator (CSB-CFREI)." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59129.

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Over the past thirty years, seismic isolation has been considered a viable earthquake damage mitigation technique and has been implemented to protect new and existing structures. However, due to the high production cost and implementation challenges of conventional seismic isolators, application of this protective technology has been limited to high value buildings with important and sensitive contents. To ensure widespread application of the base isolation systems for ordinary residential and commercial buildings, especially in developing countries, not only the production cost must be reduced, but the implementation efficiency must improve as well. With this intention in this study, a new cost effective Elevated Semi-Bonded Carbon Fiber-Reinforced Elastomeric Isolator (ESB-CFREI) with lower production cost and higher implementation efficiency is designed, manufactured, and tested. The innovative ESB-CFREI undergoes lateral cyclic excitations with a unique deformation mechanism that differs from that of conventional Steel Reinforced Elastomeric Isolators SREI and Bonded and Un-Bonded Carbon Fiber Reinforced Elastomeric Isolators. The ESB-CFREI can be used in isolation as an independent “Component Isolator” or combined with other component isolators to form a CESB-CFREI “Compound Isolator.” According to the experimental results, isolators with different bonding levels (BL) are characterized by different overall dynamic characteristics. Depending on component combination configurations, the compound isolators have different average bonding values that result in different damping, effective lateral shear, and axial compression stiffness. Results from experimental tests on different compound isolators demonstrated that change in combination configuration effectively influences the dynamic characteristics of the compound isolator. Dynamic characteristics of component (ESB-CFREI) and compound isolator (CESB-CFREI) as low-cost seismic isolators were investigated by conducting analytical and experimental studies. The isolator’s effective lateral shear and axial compression stiffness along with the isolation efficiency (IE) were defined. The experimental outcome demonstrated the effect of bonding variation on the dynamic characteristics, performance, and efficiency of the ESB-CFREI. The effects of component combination on the dynamic characteristics of the compound isolators were also investigated. Component material testing to investigate the hyper-elastic behaviour of the isolator’s rubber component and long duration excitation tests to study the isolator’s durability and performance were conducted as well.
Applied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
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Mano, Toshihisa Verfasser], Ingbert [Gutachter] [Mangerig, Akimitsu [Gutachter] Kurita, and Takashi [Gutachter] Yamaguchi. "Numerical and experimental analysis of the load-carrying behaviour of laminated elastomeric bearings as seismic isolators / Toshihisa Mano ; Gutachter: Ingbert Mangerig, Akimitsu Kurita, Takashi Yamaguchi ; Akademischer Betreuer: Ingbert Mangerig ; Universität der Bundeswehr München, Fakultät für Bauingenieurwesen und Umweltwissenschaften." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2016. http://nbn-resolving.de/urn:nbn:de:bvb:706-4854.

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Book chapters on the topic "Isolatori elastomerici"

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Barik, Jyoti Ranjan, and Purnachandra Saha. "Seismic Control of Benchmark Highway Bridge Using Fiber-Reinforced Elastomeric Isolator." In Recent Developments in Sustainable Infrastructure, 345–61. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4577-1_29.

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Sinjari, S., N. Stratton, J. Cercel, and N. Van Engelen. "Influence of the Direction of Lateral Load on Fiber-Reinforced Elastomeric Isolators." In Lecture Notes in Civil Engineering, 15–27. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0511-7_2.

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Milani, Gabriele, and Federico Milani. "Behavior of Elastomeric Seismic Isolators Varying Rubber Material and Pad Thickness: A Numerical Insight." In Advances in Intelligent Systems and Computing, 55–70. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03581-9_4.

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Riyadh, Miah Mohammed, Jhordy Rodriguez, and M. Shahria Alam. "Shape Factor Influence of Fibre Reinforced Elastomeric Isolators on the Seismic Response of a Bridge Pier." In Lecture Notes in Civil Engineering, 553–64. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0656-5_47.

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Losanno, D. "Modeling of Carbon and Polyester Elastomeric Isolators in Unbounded Configuration by Using an Efficient Uniaxial Hysteretic Model." In Lecture Notes in Mechanical Engineering, 1753–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41057-5_141.

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Kaul, Sudhir. "Elastomeric vibration isolator design." In Modeling and Analysis of Passive Vibration Isolation Systems, 171–208. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-819420-1.00005-4.

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Kaul, S. "Influence of multi-axial stiffness nonlinearity on passive vibration isolation characteristics of elastomeric isolators." In Constitutive Models for Rubber XI, 476–81. CRC Press, 2019. http://dx.doi.org/10.1201/9780429324710-84.

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Ngo, Thuyet V., Sajal K. Deb, and Anjan Dutta. "Effect of shear modulus and shape factor on the performance of prototype un-bonded fibre reinforced elastomeric isolators." In Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications, 197–202. CRC Press, 2019. http://dx.doi.org/10.1201/9780429426506-33.

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Conference papers on the topic "Isolatori elastomerici"

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Nefske, Donald J., Shung H. (Sue) Sung, and Douglas A. Feldmaier. "Identification of Dynamic Rates of Elastomeric Vibration Isolators in Automotive Vehicles." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60495.

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Dynamic stiffness and damping rates of elastomeric vibration isolators used in automotive vehicles are identified from static isolator tests and the use of an isolator finite element model. Comparisons are made of the predicted versus measured dynamic stiffness and damping rates from 0 to 300 Hz of a rear suspension isolator to validate the technique. The identified dynamic rates of the elastomeric isolators of a representative vehicle are then input to the vehicle system finite-element model to compare the predicted versus measured vehicle vibration and interior noise response for laboratory shaker excitation.
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Muju, Sandeep, and John Lane. "Effect of Elastomeric Isolator on Dynamic Response of an Exhaust System." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4118.

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Abstract Elastomeric isolators are typically used as connectors between the body-side and exhaust-side hangers to modulate the vibrational excitation input from the exhaust system into the vehicle underbody, Fig. 1. The dynamic response of these isolators must be properly tuned to avoid any interior cavity boom or structural vibration transmission. This paper studies the effect of elastomeric properties of the isolator material on the dynamic response of the exhaust system and the transmitted force response. A simplified geometry for an exhaust system is considered. The solution procedure developed may be used for an arbitrary number of isolators. In order to separate the coupling effect of multiple isolators, the effect of a single isolator is studied in detail. The problem solution is developed for a generic functional form for the dynamic stiffness of the isolator. The resulting system of equations leads to a nonlinear transcendental equation for an eigenvalue problem. Based on the available experimental data for typical isolators a functional form of dynamic stiffness is considered. The resulting solution reveals the influence of the elastomeric isolators on the dynamic characteristics of a typical exhaust system. Further, the frequency response of the force transmitted is also obtained. This procedure may be used to either predict the effect of a particular isolator for varying ambient conditions (temperature, preload, vibration amplitude) and/or may be used to tune the properties of an isolator to best suit a particular application.
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Tsai, C. S., Tsu-Cheng Chiang, Bo-Jen Chen, and Mei-Jou Chen. "Component Test of the Full Scale MFPS Base Isolator." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2956.

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In recent years, there have been more and more engineering applications of the base isolation to enhance the seismic resistibility of the existing structures. The elastomeric base isolator and the sliding base isolator are the most popular types in the engineering applications. In this paper, the experimental results for the component test of the full scale multiple friction pendulum system (MFPS) have been introduced. The MFPS base isolator is a base isolator which possesses characteristics of the elastomeric and sliding type base isolators. The effectiveness of the device in reducing the seismic response of structures during earthquakes has been confirmed from the experimental results of the shaking table tests. In order to test the mechanical behavior of a full scale MFPS base isolator, the component tests of the device subjected axial loads of 500 tons, 900 tons and horizontally cyclic loadings have been executed. The experimental results show that the MFPS base isolator has a very stable mechanical behavior under many cycles of loadings. Hence, the durability of the MFPS base isolator can be proved from these experimental results.
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Kaul, Sudhir. "Influence of Fractional Damping and Time Delay on Maxwell-Voigt Model for Vibration Isolation." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65100.

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Models of vibration isolators are very commonly used for the design and analysis of isolation systems. Accurate isolator modeling is critical for a successful prediction of the dynamic characteristics of isolated systems. Isolators exhibit a complex behavior that depends on multiple parameters such as frequency, displacement amplitude, temperature and loading conditions. Therefore, it is important to choose a model that is accurate while adequately representing the relationships with relevant parameters. Recent literature has indicated some inherent advantages of fractional derivatives that can be exploited in the modeling of elastomeric isolators. Furthermore, time delay of damping is also seen to provide a realistic representation of damping. This paper examines the Maxwell-Voigt model with fractional damping and a time delay. This model is compared with the conventional Maxwell-Voigt model (without time delay or fractional damping) and the Voigt model in order to comprehend the influence of fractional damping and time delay on dynamic characteristics. Multiple simulations are performed after identifying model parameters from the data collected for a passive elastomeric isolator. The analysis results are compared and it is observed that the Voigt model is highly sensitive to fractional damping as well as time delay.
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Tsai, C. S., Tsu-Cheng Chiang, and Bo-Jen Chen. "Exact Solution of the Base-Isolated Structure With Elastomeric-Type Base Isolator." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2901.

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Base isolation technologies have been proven to be very efficient in protecting structures from seismic hazards during experimental and theoretical studies. In recent years, there have been more and more engineering applications using base isolators to upgrade the seismic resistibility of structures. Optimum design of the base isolator can lessen the undesirable seismic hazard with the most efficiency. Hence, tracing the nonlinear behavior of the base isolator with good accuracy is important in the engineering profession. In order to predict the nonlinear behavior of base isolated structures precisely, hundreds even thousands of degrees-of-freedom and iterative algorithm are required for nonlinear time history analysis. In view of this, a simple and feasible exact formulation without any iteration has been proposed in this study to calculate the seismic responses of structures with base isolators. Comparison between the experimental results from shaking table tests conducted at National Center for Research on Earthquake Engineering in Taiwan and the analytical results show that the proposed method can accurately simulate the seismic behavior of base isolated structures with elastomeric bearings. Hence, the proposed concept can be used as a reliable tool for engineering professions for preliminary design.
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Kaul, Sudhir. "A Comparative Study of Passive Vibration Isolator Modeling and Analysis." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36007.

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Passive vibration isolators are extensively used in wide ranging applications such as automotive, aerospace, railroad and earth moving equipment in the mechanical industry, and in structural applications in the civil industry. These isolators serve as spring-damper units that isolate specific parts of a system from external dynamic loading, or from other sub-systems that cause vibration excitation. Passive isolators exhibit very complex behavior that depends on excitation frequency, displacement amplitude, ambient temperature and pre-load in addition to geometry, design features as well as material composition of the isolator. Various models are prevalent in the existing literature for the design and analysis of such isolators, ranging from the basic Voigt model to more complex models such as the Maxwell-Voigt model with multiple Maxwell elements, the Maxwell ladder model, the three dimensional viscoelastic model, the fractional derivative model, and models specifically used for capturing the hysteresis behavior or the displacement limiting behavior. However, each of these models is successful in representing certain characteristics of the isolator while being unable to capture other key attributes. This paper provides a comparative study of some of the main models that are commonly used for the design and analysis of passive vibration isolators. Experimental data collected from a passive elastomeric isolator under varying excitation conditions is used to identify parameters associated with some of the commonly used models. The analysis results are compared and specific highlights and shortcomings of each model are identified and discussed.
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Kaul, Sudhir. "Multi-Degree-of-Freedom Modeling of Mechanical Snubbing Systems." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47144.

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This paper presents a multi-degree-of-freedom model for the analysis of mechanical snubbing in elastomeric isolators. The model uses a system of elastomeric isolators and snubbers to assemble a rigid body with three degrees-of-freedom to a rigid frame. The isolators are supplemented by the snubbing system so as to limit the displacement of the rigid body in all three directions of motion when the system undergoes transient loading or overloading conditions. The model is piecewise non-linear and uses normalized Bouc-Wen elements in order to capture inherent hysteresis of the elastomeric isolators and the snubbing system as well as the transition in stiffness and damping properties resulting due to inherent coupling between the isolators and the snubbing system. Separate elements are used to model the enhanced stiffness resulting from the snubbing system in the translational directions of motion. A set of elastomeric isolators and snubbing systems is used for data collection, characterization and model validation. The data collection is carried out at multiple strain amplitudes and strain rates. A conventional least squares based parameter identification technique is used for characterization. The completely characterized model is then used for simulating the response of the rigid body and the simulation results are compared to experimental data. The simulation results are found to be in general agreement with the experimental data.
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Tsai, C. S., Tsu-Cheng Chiang, and Bo-Jen Chen. "Shaking Table Tests of a Full Scale Steel Structure Isolated With MFPS." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2100.

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The base isolation, a kind of passive control technology, has been proved as a very efficient way to ensure the safety of a structure during severe earthquakes both from theoretical study and experimental effort. In general, the base isolation can be classified into two groups, which are sliding type and elastomeric type isolator. In this study, a new base isolator called as Multiple Friction Pendulum System (MFPS) has been proposed. The lubricant material, articulated slider and doubled concave sliding interfaces of MFPS are quite different from that proposed by V. Zayas in 1987. In this study, the MFPS isolator has been equipped beneath each column of a three-story structure at the National Center for Research on Earthquake Engineering to demonstrate its seismic resistance capability. The experimental results from shaking table tests of the 1940 El Centro, 1995 Kobe and 1999 Chi-Chi earthquake show that the proposed isolator can reduce the undesirable seismic response of the structure by lengthening the fundamental period of the structure during earthquakes. The experimental results indicate that the acceleration response of each floor can be lessened significantly as compared with those of the bare structure, and that the stress responses of structural components are limited in the certain range during severe earthquakes. Furthermore, the residual displacements of base isolators are negligible. Therefore, it is shown evidently that the proposed isolator can always bring the base-isolated structure to its initial position after an earthquake. Based on the previous observations, the proposed isolator can be adopted as an effective tool for upgrading the seismic resistibility of a structure. A finite element formulation for the MFPS is also proposed to simulate its mechanical behavior during earthquakes.
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"Elastomeric Seismic Isolators Behavior at Different Pads Thickness." In 2nd International Conference on Simulation and Modeling Methodologies, Technologies and Applications. SciTePress - Science and and Technology Publications, 2012. http://dx.doi.org/10.5220/0004012000170023.

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10

Hu, Zhi-Quan, T. Y. Chen, and Gary Novak. "Parametric Model of Elastomeric Bolt Isolators Under Large Deformation." In SAE International Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/970522.

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