Articoli di riviste: "Isolation Systems"

1

Gershon, Diane. "Splendid isolation systems". Nature 350, n. 6315 (marzo 1991): 255–58. http://dx.doi.org/10.1038/350255a0.

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Kelly, James M. "Seismic Isolation Systems for Developing Countries". Earthquake Spectra 18, n. 3 (agosto 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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Balandin, D. V., N. N. Bolotnik e W. D. Pilkey. "Pre-Acting Control for Shock and Impact Isolation Systems". Shock and Vibration 12, n. 1 (2005): 49–65. http://dx.doi.org/10.1155/2005/578381.

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Pre-acting control in shock/impact isolation systems is studied. With pre-acting control, the isolation system begins to respond to an impact before this impact has been applied to the base. The limiting performance of the isolator with pre-acting control is investigated for a single-degree-of-freedom system subject to an instantaneous impact. The isolation performance index is defined as the maximum of the absolute value of the displacement of the object to be isolated relative to the base, provided that the magnitude of the control force transmitted to the object does not exceed a prescribed value. It is shown that there is a substantial advantage in the use of pre-acting isolators over isolators without pre-action. Particular attention is given to a pre-acting isolator based on a passive elastic element (a spring) separating the object to be protected from the base. An example illustrates the calculation of the design parameters of such an isolator.

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4

Ramallo, J. C., E. A. Johnson e B. F. Spencer. "“Smart” Base Isolation Systems". Journal of Engineering Mechanics 128, n. 10 (ottobre 2002): 1088–99. http://dx.doi.org/10.1061/(asce)0733-9399(2002)128:10(1088).

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5

Sandercock, John R. "Active vibration isolation systems". Journal of the Acoustical Society of America 90, n. 6 (dicembre 1991): 3387. http://dx.doi.org/10.1121/1.401376.

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6

Ozbulut, Osman E., e Stefan Hurlebaus. "A Comparative Study on the Seismic Performance of Superelastic-Friction Base Isolators against Near-Field Earthquakes". Earthquake Spectra 28, n. 3 (agosto 2012): 1147–63. http://dx.doi.org/10.1193/1.4000070.

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This paper presents a comparative seismic performance assessment of super-elastic-friction base isolator (S-FBI) systems in improving the response of bridges under near-field earthquakes. The S-FBI system consists of a steel-Teflon sliding bearing and a superelastic shape memory alloy (SMA) device. The other isolation systems considered here are lead rubber bearing (LRB), friction pendulum system (FPS), and resilient-friction base isolator (R-FBI). Each isolation system is designed to provide the same isolation period and characteristic strength. Nonlinear time-history analyses of an isolated bridge are performed to compare the performance of various isolation systems. The results indicate that the S-FBI system shows superior performance in reducing deck displacement response and effectively limits permanent bearing deformation, whereas residual deformations are present for the other isolation systems in some cases. It is also observed that the LRB system has the largest deck drifts while the FPS system and R-FBI system produce the smallest peak deck acceleration and base shear.

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7

Liu, Yujun, Jing Liu, Guang Pan, Qiaogao Huang e Liming Guo. "Vibration Analysis and Isolator Component Design of the Power System in an Autonomous Underwater Glider". International Journal of Acoustics and Vibration 27, n. 2 (30 giugno 2022): 112–21. http://dx.doi.org/10.20855/ijav.2022.27.21841.

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Vibration isolation technology is one of the main methods for controlling the vibration and noise of underwater vehicles. This paper presents a vibration analysis and vibration isolator component design method of the power system in autonomous underwater gliders (AUGs). The dynamic models of the single-layer and double-layers vibration isolation systems of the power system of the AUG are established to analyze the force transfer rate in the system. A reasonable stiffness range of the vibration isolation system is obtained according to the results of the dynamic model. To validate the vibration isolation performances of the presented vibration isolation systems, the finite element (FE) models of single-layer and double-layers vibration isolation systems are established. The vibration responses and vibration isolation performances of the system with and without the rubber isolation systems are compared. Moreover, the effect of stiffness on the vibration isolation performances of the system is discussed. The presented results can provide some guidance for the design method of the vibration isolation system in the power system of AUGs.

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8

SHRIMALI, M. K., e R. S. JANGID. "A COMPARATIVE STUDY OF PERFORMANCE OF VARIOUS ISOLATION SYSTEMS FOR LIQUID STORAGE TANKS". International Journal of Structural Stability and Dynamics 02, n. 04 (dicembre 2002): 573–91. http://dx.doi.org/10.1142/s0219455402000725.

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A comparative study of performance of various isolation systems for liquid storage tanks is investigated under real earthquake ground motions. The various base isolation systems considered are the laminated rubber bearings (with and without lead core) and sliding isolation systems (with and without restoring force). The isolated liquid storage tank is idealized with three-degrees-of-freedom associated with convective, impulsive and rigid mass under uni-directional earthquake excitation. Since the force-deformation behaviour of the isolation systems is non-linear, as a result, the equations of motion are solved numerically by step-by-step method. In order to measure the effectiveness of the isolation systems, the seismic response of the isolated liquid storage tanks is compared with the corresponding response of non-isolated tanks. Further, the effectiveness of the isolation is also explored for wide range of practical liquid storage tanks considering the influence of tank aspect ratio. It is observed that the isolation systems are quite effective in attenuating the earthquake acceleration transmitted to the tank, which reduces the design seismic forces significantly. Further, it is also found that the sliding type isolation systems are more effective in controlling the response of liquid storage tanks in comparison to the elastomeric bearings. Among the various sliding systems, the resilient-friction base isolator is found to be most effective for seismic isolation of the tanks.

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9

Rezaei, Sima, e Gholamreza Ghodrati Amiri. "Effect of Supplemental Damping on the Seismic Performance of Triple Pendulum Bearing Isolators under Near-Fault Ground Motions ". Applied Mechanics and Materials 845 (luglio 2016): 240–45. http://dx.doi.org/10.4028/www.scientific.net/amm.845.240.

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The isolating system absorbs part of the earthquake energy before transferring it to the structure, by shifting the natural period of the isolated structure. This period shift results in a reduction in the inertial forces. It is clear that the effects of near-fault (NF) ground motions with large velocity pulses can bring the seismic isolation devices to critical working conditions. In this study, two three-dimensional RC buildings with the heights of 9.0m and 21.0m which are supported by Triple Friction Pendulum Bearing (TFPB) isolators are idealized. Various TFPB configurations are selected for isolation systems. There are also viscous dampers to limit the excess deformation of isolators. Nonlinear time history analyses were performed by using OpenSees to study the influence of supplemental dampers on structural responses such as isolator displacements and maximum drifts under ten near-fault ground motion records. The results show noticeable reduction in isolator displacement when using dampers. However, maximum drift rises considerablely. Moreover by increasing the period range or reducing the damping ratio of isolation system, maximum driftreduces but the displacement of isolator increases.

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10

Hong, Zhong, Jian-Min Jiang e Hongping Shu. "Analyzing Isolation in Mobile Systems". Information Technology and Control 50, n. 4 (16 dicembre 2021): 769–85. http://dx.doi.org/10.5755/j01.itc.50.4.29031.

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As a safety-critical issue in complex mobile systems, isolation requires two or more mobile objects not to appear in the same place simultaneously. To ensure such isolation, a scheduling policy is needed to control and coordinate the movement of mobile objects. Unfortunately, existing task scheduling theories fails in providing effective solutions, because it is hardly possible to decompose a complex mobile system into multiple independent tasks. To solve this problem, a more fine-grained event scheduling is proposed in this paper to generate scheduling policies which can ensure the isolation of mobile objects. After defining event scheduling based on event-based formal models called dependency structures, a new event scheduling theory for mobile systems is developed accordingly. Then an algorithm for generating an event scheduling policy is proposed to implement the required isolation. Simulation experiments are conducted to prove the result of our theoretical analysis and show the effectiveness and scalability of the approach.

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11

Fujita, Takafumi. "Seismic Isolation Systems and Time". Journal of the Society of Mechanical Engineers 96, n. 890 (1993): 77–78. http://dx.doi.org/10.1299/jsmemag.96.890_77.

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12

Lin, B. C., I. G. Tadjbakhsh, A. S. Papageorgiou e G. Ahmadi. "Performance of Earthquake Isolation Systems". Journal of Engineering Mechanics 116, n. 2 (febbraio 1990): 446–61. http://dx.doi.org/10.1061/(asce)0733-9399(1990)116:2(446).

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13

Ferri, A. A. "Friction Damping and Isolation Systems". Journal of Mechanical Design 117, B (1 giugno 1995): 196–206. http://dx.doi.org/10.1115/1.2836456.

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This paper surveys the literature on the use of dry friction in passive damping and vibration isolation. Several analytical techniques are presented followed by applications from various areas. Despite difficulties in the analytical and experimental treatment of friction damped systems, numerous studies have endeavored to predict, measure, and/or enhance the energy dissipation and vibration isolation properties of dry friction in order to improve system performance. Undoubtedly, friction damping will continue to play an important role in many mechanical and structural systems.

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14

Ferri, A. A. "Friction Damping and Isolation Systems". Journal of Vibration and Acoustics 117, B (1 giugno 1995): 196–206. http://dx.doi.org/10.1115/1.2838663.

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This paper surveys the literature on the use of dry friction in passive damping and vibration isolation. Several analytical techniques are presented followed by applications from various areas. Despite difficulties in the analytical and experimental treatment of friction damped systems, numerous studies have endeavored to predict, measure, and/or enhance the energy dissipation and vibration isolation properties of dry friction in order to improve system performance. Undoubtedly, friction damping will continue to play an important role in many mechanical and structural systems.

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15

Sun, Hongling, Kun Zhang, Haibo Chen e Peiqiang Zhang. "Improved active vibration isolation systems". Tsinghua Science and Technology 12, n. 5 (ottobre 2007): 533–39. http://dx.doi.org/10.1016/s1007-0214(07)70129-3.

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16

Yingli, Li, e Xu Daolin. "Force transmissibility of floating raft systems with quasi-zero-stiffness isolators". Journal of Vibration and Control 24, n. 16 (17 maggio 2017): 3608–16. http://dx.doi.org/10.1177/1077546317708460.

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In view of the excellent performance of a single quasi-zero-stiffness (QZS) device in vibration attenuation, this paper presents a study on a vibration isolation floating raft system constructed with a double-layer QZS mechanism. A QZS device is a typical nonlinear isolator, hence the floating raft system is a coupled highly nonlinear isolation system. To understand the behaviors and its performance in vibration attenuation, an analytical approach is developed to describe the characteristics including the mathematical relationship between amplitude–frequency, force transmissibility, and the effects of the mass ratio and damping ratios on attenuation performance. The outcomes show that the two-degree-of-freedom QZS–QZS system is superior for vibration isolation when compared to the traditional linear system and the two other types of QZS systems. The effective vibration isolation frequency region of the QZS–QZS system is expanded to the low-frequency region by 72%. The QZS system is sensitive to the damping ratio, which decreases the resonance peak significantly. The mass ratio is a crucial design parameter in low-frequency vibration isolation design.

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17

Bednarz, Jarosław. "The New Methodology for Assessing of the Applicability of Elastomeric Materials in the Vibration Isolation Systems of Railway Lines". Archives of Acoustics 41, n. 3 (1 settembre 2016): 573–78. http://dx.doi.org/10.1515/aoa-2016-0055.

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Abstract The technical requirements for the determination of physical parameters of vibration isolating material have not been standardized in Europe and Poland yet, which significantly hinders the ability to compare vibration isolating materials offered on the market. Therefore, there is a need for establishing a norm that could be applied both for the determination of the physico-mechanical properties of elastic vibration isolation elements in rail transport for domestic and foreign producers as well as in their selection for application in a specific vibration isolation system. The paper presents a proposal to standardize the methodology of the estimation of vibration isolation materials physical parameters authorized for use in vibration isolation systems used in rail transport. Methodology for measuring the physico-mechanical parameters of vibration isolating material presented in the paper forms uniform test procedure developed based on a fragmentary norms for flexible materials testing. The use of the proposed research methodology enables the creation of a unified database of elastic materials which parameters will be easy to compare, and choice between them will become easier for designers of vibration isolation systems used in rail transport.

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18

Duan, Shao Wei, Xiao Wei Tao e Hai Kuan Liu. "The Isolation Effect Analysis of Base and Story Isolation System in Vertical Seismic Action". Advanced Materials Research 163-167 (dicembre 2010): 3893–98. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3893.

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Through establishing single material point model of base isolation system and two material points model of story isolation system in vertical earthquake, the isolation effect of base and story isolation system in vertical earthquake are studied. Results show that two kinds of isolation systems cannot effectively keep apart the vertical seismic action, and the effect is amplified on the contrary, especially the position of isolation layers in story structures affect the amplification effect. Compared with the base and story isolation structures, while using the same isolation device, the former is better than the latter in isolating vertical seismic action.

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19

Kazakov, Maxim. "The study of isolation in the collectives of special-purpose railroad cars as an element of the sustainable development of social systems". E3S Web of Conferences 402 (2023): 06015. http://dx.doi.org/10.1051/e3sconf/202340206015.

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The article provides examples of labour social isolations. Multiple professions in which social isolation is present are compared, and differences are revealed both in the process of isolation itself and the influence of other psychogenic factors. The question was raised about the complexity of classifying labour social isolation. The definition of social exclusion is given. Teams that face social isolation were considered. The main differences were identified, both in psychogenic factors and in the isolation itself, of each profession. The fact of the existing social isolation in the collectives of specialized railroad cars was proved by conducting empirical studies in these collectives. The “Results” section presents a table that reflects the main psychogenic factors in the professions considered. Based on the data, a classification of labour social isolation was made. The classification of isolation types was represented by two groups: deprivation social isolation, rather acute isolation; irritable social isolation, less problematic but more common social isolation. The possibility of creating a universal “isolation passport” is discussed. All factors of social isolation of the group can be combined into three components: external factors; organizational and production factors; socio-psychological factors.

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20

Vinski, Joan, Mary Bertin, Zhiyuan Sun, Steven M. Gordon, Daniel Bokar, James Merlino e Thomas G. Fraser. "Impact of Isolation on Hospital Consumer Assessment of Healthcare Providers and Systems Scores: Is Isolation Isolating?" Infection Control & Hospital Epidemiology 33, n. 5 (maggio 2012): 513–16. http://dx.doi.org/10.1086/665314.

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The Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) survey was used to measure the effect of isolation on patient satisfaction. Isolated patients reported lower scores for questions regarding physician communication and staff responsiveness. Overall scores for these domains were lower in isolated than in nonisolated patients.

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21

Edalati, Ali Akbar, e Hossein Tahghighi. "Investigating the Performance of Isolation Systems in Improving the Seismic Behavior of Urban Bridges. A Case Study on the Hesarak Bridge". Archives of Civil Engineering 65, n. 4 (1 dicembre 2019): 155–75. http://dx.doi.org/10.2478/ace-2019-0052.

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AbstractThis paper investigates the influence of isolation systems on the seismic behavior of urban reinforce concrete bridge. The performance of the Hesarak Bridge constructed in Karaj city, Iran with two isolation systems; i.e. the existing elastomeric rubber bearing (ERB) and a proposed lead rubber bearing (LRB) is discussed. The numerical model was implemented in the well-known FEM software CSIBridge. The isolated bridge has been analyzed using nonlinear time history analysis method with seven pairs of earthquake records and the results are compared for the two isolation systems. The LRB isolators are shown to have superior seismic performance in comparison with the existing ERB systems based on the response evaluation including force on the isolator, pier base shear, deck acceleration, bending moment, pier displacement, and energy dissipation.

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22

Liberman, Mikhail (Yudimovich). "Investigation of Efficiency of Vibration Isolation for Cabins of Self-Propelled Machines". Journal of Low Frequency Noise, Vibration and Active Control 15, n. 4 (dicembre 1996): 157–60. http://dx.doi.org/10.1177/026309239601500403.

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A method for calculation of the efficiency of vibration isolating systems, which are used in self-propelled machines, is presented. The influence of parameters of vibration isolating systems (masses and stiffnesses of foundation, load and elastic elements of vibration isolators, losses of oscillatory energy in elements of system) on efficiency of vibration isolation is determined. Good agreement is found between theoretical and experimental results. Results of experimental research for vibration isolating systems, which are used in real machines (excavator and tractor), are presented.

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23

Brancati, Renato, Giandomenico Di Massa, Luigi Pio Di Noia e Stefano Pagano. "A Hybrid Vibration Isolator Based on Elastomeric and Electromagnetic Restoring Force". Applied Sciences 13, n. 17 (24 agosto 2023): 9594. http://dx.doi.org/10.3390/app13179594.

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The protection of structures and machines from ground vibrations is a deeply felt and widely studied problem. These vibrations are typically generated by the operation of machines, vehicular traffic, seismic events, shocks, explosions, etc., and are generally characterized by frequencies that are not known a priori, making the use of passive isolation systems problematic. Just away from the source, ground vibrations have a predominantly horizontal component. To meet the conflicting requirements of passive isolation systems, which should have higher stiffness when the structure is at rest and lower stiffness when the ground forces it to vibrate, active or semi-active isolation systems can be adopted. In the following article, the possibility of adopting a hybrid isolator is evaluated; it consists of shear-stressed elastomeric pads coupled with an electromagnetic actuator; the latter consists of three coils, two of which are connected to the ground and the other one to the body to be isolated. This kind of isolator has the same flexibility and adaptability as the active ones, with the advantage of ensuring its functioning even in the absence of an external energy source. Its flexibility is due to the presence of a smart element that allows one to tune the characteristics of the isolator to consider the instantaneous isolation requirements. The proposed solution allows one to modify the isolation system’s characteristics in a sufficiently wide range of displacements equal to that defined by the maximum allowed deformation of the elastomeric pads. This paper reports the description of the isolation system and an analytical model to describe its restoring force; then, an experimental setup is adopted to identify the parameters of the analytic model; finally, several simulations are reported to compare the analytical and the experimental trends of the restoring force and to characterize the isolator.

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24

Beykzade, Mohammad, Alireza Baghchesaraei e Omid Reza Baghchesaraei. "Evaluation of Steel Frame Structures with the Response of Seismic Isolators". Civil and Environmental Engineering Reports 30, n. 3 (1 settembre 2020): 24–47. http://dx.doi.org/10.2478/ceer-2020-0032.

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Abstract As science keeps evolving over time, new solutions are being put forward for reducing structural damage. One such solution is the use of seismic isolation systems. Seismic isolation systems reduce the response of structures to the force of earthquakes by reducing the input (force) acceleration when the natural period of the structure increases. Therefore, the use of seismic isolation systems is recommended in the analysis of diverse structures. This study was carried out on seismically isolated buildings with 8, 10, and 12 regular steel floors, modeled by a non-linear isolator in two-, or three-second periods. The differences in data and the responses of the buildings were compared with fixed-base buildings with 8, 10, and 12 floors.

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Kumar, Sooraj, e Ganesh Jaiswal. "Effectiveness of Different Base Isolation on Stepped Buildings". International Journal for Research in Applied Science and Engineering Technology 10, n. 7 (31 luglio 2022): 4345–53. http://dx.doi.org/10.22214/ijraset.2022.45997.

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Abstract: Seismic isolation devices are commonly employed to protect structures from the impacts of severe ground motions. ETABS2016, a modelling and analysis programme, was used in this work to model and analyse the isolated stepped building. Rubber isolator link components were used as a single joint element to represent the rubber isolators between the ground and the superstructure. El-Centro seismic records were used to analyse the isolated building. The lateral inter-storey drifts, story displacement and peak absolute floor accelerations, of the isolated building were compared to those of the fixed-base structure. The current study aims to evaluate the effectiveness of several types of base isolation systems for seismic protection of 6-story stepped structures using Time history analysis. The isolation systems considered include, i) rubber isolators, ii) rubber isolators with energy dissipation systems, and iii) friction pendulum isolators.

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Zhang, Li, Hao Chen, Yan Jue Gong e Jing Wang. "Experimental Modal Analysis of Compressor Vibration Isolating System Based on LMS Test.Lab". Applied Mechanics and Materials 121-126 (ottobre 2011): 3283–88. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3283.

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In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experimental modal analysis based on LMS Test. Lab Impact Testing software. The comparison results of modal parameters of four different vibration isolating systems show that the natural frequency of single-layer vibration isolating system is higher than that of non-isolation system and effectively avoids the second order resonance frequency. Furthermore the natural frequency of double-layer vibration isolating system has reduced due to the additional middle-mass. And the system's natural frequency decreases obviously with the increase of middle-mass which is far from resonance frequency and significantly improve the effect of vibration isolating system.

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Zelleke, Daniel H., Sandip K. Saha e Vasant A. Matsagar. "Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation". Shock and Vibration 2020 (19 dicembre 2020): 1–24. http://dx.doi.org/10.1155/2020/8830460.

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The issues of safety and posthazard functionality of structures under multihazard scenarios are some of the significant challenges in the current dynamic and rapidly growing urban environment. In this paper, multistory base-isolated buildings are investigated under the independent multihazard scenario of earthquake and blast-induced ground motion (BIGM). Multistory building models equipped with five different types of isolation systems, namely, the laminated rubber bearing (LRB), lead-rubber bearing (N-Z system), pure friction (PF) system, friction pendulum system (FPS), and resilient-friction base isolator (R-FBI) are assessed under bidirectional multihazard excitations. The suitability of the isolation systems and their key parameters in protecting multistory buildings is evaluated. Furthermore, the influence of the superstructure characteristics, such as the superstructure damping and the number of stories, is also assessed. The effect of bidirectional hazards on fixed-base buildings is also presented for comparison. The key response quantities of base-isolated buildings are presented and compared for different isolation systems. Parametric investigations are also conducted, and the trends of the response quantities are presented to study the influence of important parameters of isolation systems in protecting the buildings under the multihazard scenario of earthquake and BIGM. The results of the investigation show that the behaviors of the buildings equipped with various isolation systems are different for the two hazards. Moreover, the influences of the key parameters of the isolation systems are found to be different for various hazards. Therefore, the selection of design parameters of isolation systems shall be made with due consideration of the influence of multiple hazards. Additionally, the influence of the properties of the superstructure, such as the number of stories and the damping of the superstructure, on the behavior of the base-isolated buildings under the multihazard loading, is presented.

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Amir, M. A., e N. H. Hamid. "Hysteresis Loops of Base Isolation System - An Overview". Key Engineering Materials 879 (marzo 2021): 189–201. http://dx.doi.org/10.4028/www.scientific.net/kem.879.189.

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Recently, there are a lot of technological developments in the earthquake engineering field to reduce structural damage and one of them is a base isolation system. The base isolation system is one of the best technologies for the safety of human beings and properties under earthquake excitations. The aim of this paper is to review previous research works on simulation of base isolation systems for RC buildings and their efficiency in the safety of these buildings. Base isolation decouples superstructure from substructure to avoid transmission of seismic energy to the superstructure of RC buildings. The most effective way to assess the base isolation system for RC building under different earthquake excitations is by conducting experiment work that consumes more time and money. Many researchers had studied the behavior of base isolation system for structure through modeling the behavior of the base isolation in which base isolator is modeled through numerical models and validated through experimental works. Previous researches on the modeling of base isolation systems of structures had shown similar outcomes as the experimental work. These studies indicate that base isolation is an effective technology in immunization of structures against earthquakes.

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Sirotin, P. V., I. Yu Lebedinskii, M. M. Zhileikin e M. I. Sysoev. "Test Bench for Vibration Isolation Systems". Russian Engineering Research 40, n. 7 (luglio 2020): 551–55. http://dx.doi.org/10.3103/s1068798x20070229.

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Zhao, Qun, Chen Zhang e Jin Fang Zhao. "Design of Double-Deck Isolation Systems". Advanced Materials Research 118-120 (giugno 2010): 389–93. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.389.

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On the basis of the powerflow theory and four-end parameter analysis method, the responses and the powerflow characteristics of the vibration transfer path system are examined. The sensitivity of non-linear damping is employed as measurement criterion. The powerflow and powerflow sensitivity are obtained and the effect on powerflow and powerflow sensitivity of dry friction damping, fluid damping and structural damping is studied. Numerical results are also presented and discussed. It is supposed to study the sensitivity of these parameters, to estimate the effect of the change of parameters, to improve the design performance.

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31

Uçar, Yunus, e Mehmet Fatih Altan. "Seismic Isolation Systems Against Earthquake Disaster". Journal of Sustainable Construction Materials and Technologies 3, n. 3 (31 ottobre 2018): 271–77. http://dx.doi.org/10.29187/jscmt.2018.30.

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32

Horak, Dan T. "System failure isolation in dynamic systems". Journal of Guidance, Control, and Dynamics 13, n. 6 (novembre 1990): 1075–82. http://dx.doi.org/10.2514/3.20581.

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Elliott, S. J., L. Benassi, M. J. Brennan, P. Gardonio e X. Huang. "Mobility analysis of active isolation systems". Journal of Sound and Vibration 271, n. 1-2 (marzo 2004): 297–321. http://dx.doi.org/10.1016/s0022-460x(03)00770-3.

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34

Giovanini, Leonardo, e Arkadiusz Dutka. "Fault Isolation Filter for Nonlinear Systems". IFAC Proceedings Volumes 36, n. 5 (giugno 2003): 741–46. http://dx.doi.org/10.1016/s1474-6670(17)36581-3.

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35

Polycarpou, M. M., T. Parisini e X. Zhang. "Fault Isolation of Nonlinear Uncertain Systems". IFAC Proceedings Volumes 33, n. 11 (giugno 2000): 723–28. http://dx.doi.org/10.1016/s1474-6670(17)37446-3.

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36

Su, Lin, Goodarz Ahmadi e Iradj G. Tadjbakhsh. "Comparative Study of Base Isolation Systems". Journal of Engineering Mechanics 115, n. 9 (settembre 1989): 1976–92. http://dx.doi.org/10.1061/(asce)0733-9399(1989)115:9(1976).

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37

SCIULLI, DINO, e DANIEL J. INMAN. "Isolation Design for Fully Flexible Systems". Journal of Intelligent Material Systems and Structures 10, n. 10 (1 ottobre 1999): 813–24. http://dx.doi.org/10.1106/bqle-95f6-e0ar-a2yx.

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38

Sciulli, Dino, e Daniel J. Inman. "Isolation Design for Fully Flexible Systems". Journal of Intelligent Material Systems and Structures 10, n. 10 (ottobre 1999): 813–24. http://dx.doi.org/10.1106/bqle-95f6-eoar-a2yx.

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39

Crawford, John E., e R. D. Jones. "Shock isolation systems modeled with adiana". Computers & Structures 32, n. 3-4 (gennaio 1989): 601–7. http://dx.doi.org/10.1016/0045-7949(89)90349-0.

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40

Rutman, Yuri L., e Nadezhda V. Ostrovskaya. "Damping Optimization in Seismic Isolation Systems". Key Engineering Materials 828 (dicembre 2019): 129–35. http://dx.doi.org/10.4028/www.scientific.net/kem.828.129.

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Abstract (sommario):

To protect civil buildings, industrial facilities and bridges against earthquakes and explosions, various seismic isolation systems (SIS) are used. SISs always include dissipative elements that dissipate energy transmitted to the protected object (PO) during seismic effect, operation of which is based on the elastic-plastic deformation of special structures — elastic-plastic dampers (PD). The paper proposes a method for selecting the optimum design parameters of elastic-plastic dampers in SISs. The problem is solved upon specifying an ensemble of random seismic effects. A suite of artificial accelerograms obtained by statistical modeling is used as a stream of events supplied to the right side of motion equations. Dispersion of PO absolute accelerations was chosen as an optimization criterion. After linearization of the model, the dimensionless damping coefficient introduced into the dynamic model according to the Voigt–Bock hypothesis was taken as a variable parameter. Relationship between the selected optimization criterion and the theory of seismic risk of V.V. Bolotin has been established. It is shown that optimization of the damping coefficient reduces the seismic risk by 1.5–1.8 times. A method has been developed for transition from the optimum damping coefficient to design parameters of elastic-plastic dampers that implement this coefficient. Analytical dependences have been obtained enabling to set those parameters easily.

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41

Niemann, Henrik, e Niels Kjølstad Poulsen. "Active Fault Isolation in MIMO Systems". IFAC Proceedings Volumes 47, n. 3 (2014): 8012–17. http://dx.doi.org/10.3182/20140824-6-za-1003.01516.

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42

Smallwood, David O. "Applied Theory of Vibration Isolation Systems". Shock and Vibration 1, n. 1 (1993): 95–96. http://dx.doi.org/10.1155/1993/593920.

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43

Heertjes, Marcel F., Ismail Hakki Sahin, Nathan van de Wouw e W. P. Maurice H. Heemels. "Switching Control in Vibration Isolation Systems". IEEE Transactions on Control Systems Technology 21, n. 3 (maggio 2013): 626–35. http://dx.doi.org/10.1109/tcst.2012.2188294.

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44

Inaudi, José A., e James M. Kelly. "Hybrid isolation systems for equipment protection". Earthquake Engineering & Structural Dynamics 22, n. 4 (aprile 1993): 297–313. http://dx.doi.org/10.1002/eqe.4290220403.

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45

Inaudi, Jose A., e James M. Kelly. "Optimum damping in linear isolation systems". Earthquake Engineering & Structural Dynamics 22, n. 7 (luglio 1993): 583–98. http://dx.doi.org/10.1002/eqe.4290220704.

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46

Fragiacomo, M., S. Rajgelj e F. Cimadom. "Design of bilinear hysteretic isolation systems". Earthquake Engineering & Structural Dynamics 32, n. 9 (2003): 1333–52. http://dx.doi.org/10.1002/eqe.276.

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47

Haddad, S. D. "Applied theory of vibration isolation systems". Mechanism and Machine Theory 28, n. 1 (gennaio 1993): 179–80. http://dx.doi.org/10.1016/0094-114x(93)90058-4.

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48

Kot, Lucja, Nitin Gupta, Sudip Roy, Johannes Gehrke e Christoph Koch. "Beyond isolation". ACM SIGMOD Record 39, n. 1 (27 settembre 2010): 27–32. http://dx.doi.org/10.1145/1860702.1860706.

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49

Bogdanova, G. A., e E. A. Dymov. "Increasing the Seismic Isolation of Gas Tanks Using Seismic Isolation Systems". IOP Conference Series: Materials Science and Engineering 1079, n. 3 (1 marzo 2021): 032019. http://dx.doi.org/10.1088/1757-899x/1079/3/032019.

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50

Ismail, Mohammed, José Rodellar e Joan R. Casas. "Seismic Behavior of RNC-Isolated Bridges: A Comparative Study under Near-Fault, Long-Period, and Pulse-Like Ground Motions". Advances in Materials Science and Engineering 2016 (2016): 1–18. http://dx.doi.org/10.1155/2016/1897045.

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Abstract (sommario):

This paper introduces a recent seismic isolation system, named Roll-in-Cage (RNC) isolator, for efficient protection of bridges against destructive earthquakes. The RNC isolator is a rolling-based isolation system with several integrated features in a single unit providing all the necessary functions of vertical rigid support, horizontal flexibility, full stability, hysteretic energy dissipation, and resistance to minor vibration loads. Besides, it is distinguished by a self-stopping (buffer) mechanism to limit the peak bearing displacement under abrupt severe excitations, a linear gravity-based self-recentering mechanism to prevent permanent dislocations after excitations, and a notable resistance to axial tension. A three-span box-girder prestressed concrete bridge is investigated under a set of different destructive real and synthetic earthquakes including near-fault, long-period, and pulse-like ground motions. As a performance measure, the responses of isolated and nonisolated cases are compared. In addition, the RNC isolator’s behavior is then compared with those of other isolation systems including HDB, FPS, and LRB. The results confirmed that the RNC isolator has a superior behavior in achieving a balance between the peak displacements and accelerations of the isolated deck, relative other isolation systems, besides being the most (relatively) efficient isolator in the great majority of studies performed.

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