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Добірка наукової літератури з теми "Isolation Systems"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "Isolation Systems"

Gershon, Diane. "Splendid isolation systems." Nature 350, no. 6315 (March 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, 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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Balandin, D. V., N. N. Bolotnik, and W. D. Pilkey. "Pre-Acting Control for Shock and Impact Isolation Systems." Shock and Vibration 12, no. 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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Ramallo, J. C., E. A. Johnson, and B. F. Spencer. "“Smart” Base Isolation Systems." Journal of Engineering Mechanics 128, no. 10 (October 2002): 1088–99. http://dx.doi.org/10.1061/(asce)0733-9399(2002)128:10(1088).

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Sandercock, John R. "Active vibration isolation systems." Journal of the Acoustical Society of America 90, no. 6 (December 1991): 3387. http://dx.doi.org/10.1121/1.401376.

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Ozbulut, Osman E., and Stefan Hurlebaus. "A Comparative Study on the Seismic Performance of Superelastic-Friction Base Isolators against Near-Field Earthquakes." Earthquake Spectra 28, no. 3 (August 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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Liu, Yujun, Jing Liu, Guang Pan, Qiaogao Huang, and Liming Guo. "Vibration Analysis and Isolator Component Design of the Power System in an Autonomous Underwater Glider." International Journal of Acoustics and Vibration 27, no. 2 (June 30, 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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SHRIMALI, M. K., and R. S. JANGID. "A COMPARATIVE STUDY OF PERFORMANCE OF VARIOUS ISOLATION SYSTEMS FOR LIQUID STORAGE TANKS." International Journal of Structural Stability and Dynamics 02, no. 04 (December 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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Rezaei, Sima, and 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 (July 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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Hong, Zhong, Jian-Min Jiang, and Hongping Shu. "Analyzing Isolation in Mobile Systems." Information Technology and Control 50, no. 4 (December 16, 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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Дисертації з теми "Isolation Systems"

Mansour, Mohamed S. "Behavior Isolation in Enterprise Systems." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14613.

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A barrier to creating the platform-independent services envisioned by middleware-based development infrastructures is the level of performance robustness of the distributed applications created with them, in lieu of unpredictable variations in application behavior or in the resources available for satisfying user requests. Our goal is to improve the behavior locality of distributed applications and to prevent performance (mis-)behaviors from spilling across certain boundaries, since such spillage weakens behavior diagnoses and/or weakens or disables the effects of locally applied control or management methods. Toward these ends, we develop a novel software abstraction, termed {em isolation points} (I-points), which can be used to isolate application components or subsystems from each other. The main contributions of this work are Isolation Points, which are software abstractions for monitoring and understanding dynamic runtime behaviors to better isolation application components hence creating more robust distributed applications. Two concrete artifacts using I-points also developed in this thesis are: I(solation)-RMI and I(solatoin)-Queue. I-RMI demonstrates the utility of isolation points in J2EE's RMI-IIOP domain. I(solation)-Queue applies isolation points to message passing systems.

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Manarbek, Saruar. "Study of base isolation systems." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82820.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 55-56).
The primary objective of this investigation is to outline the relevant issues concerning the conceptual design of base isolated structures. A 90 feet high, 6 stories tall, moment steel frame structure with tension cross bracing is used to compare the response of both fixed base and base isolated schemes to severe earthquake excitations. Techniques for modeling the superstructure and the isolation system are also described. Elastic time-history analyses were carried out using comprehensive finite element structural analysis software package SAP200. Time history analysis was conducted for the 1940 El Centro earthquake. Response spectrum analysis was employed to investigate the effects of earthquake loading on the structure. In addition, the building lateral system was designed using the matrix stiffness calibration method and modal analysis was employed to compare the intended period of the structure with the results from computer simulations. Base isolation proves to be effective in reducing the induced inertia forces on a structure by increasing the effective period of oscillation. Keywords: Base Isolation, time history analysis, response spectrum analysis, matrix stiffness calibration method.
by Saruar Manarbek.
M.Eng.

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Behrens, Diogo. "Error isolation in distributed systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-203428.

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In distributed systems, if a hardware fault corrupts the state of a process, this error might propagate as a corrupt message and contaminate other processes in the system, causing severe outages. Recently, state corruptions of this nature have been observed surprisingly often in large computer populations, e.g., in large-scale data centers. Moreover, since the resilience of processors is expected to decline in the near future, the likelihood of state corruptions will increase even further. In this work, we argue that preventing the propagation of state corruption should be a first-class requirement for large-scale fault-tolerant distributed systems. In particular, we propose developers to target error isolation, the property in which each correct process ignores any corrupt message it receives. Typically, a process cannot decide whether a received message is corrupt or not. Therefore, we introduce hardening as a class of principled approaches to implement error isolation in distributed systems. Hardening techniques are (semi-)automatic transformations that enforce that each process appends an evidence of good behavior in the form of error codes to all messages it sends. The techniques “virtualize” state corruptions into more benign failures such as crashes and message omissions: if a faulty process fails to detect its state corruption and abort, then hardening guarantees that any corrupt message the process sends has invalid error codes. Correct processes can then inspect received messages and drop them in case they are corrupt. With this dissertation, we contribute theoretically and practically to the state of the art in fault-tolerant distributed systems. To show that hardening is possible, we design, formalize, and prove correct different hardening techniques that enable existing crash-tolerant designs to handle state corruption with minimal developer intervention. To show that hardening is practical, we implement and evaluate these techniques, analyzing their effect on the system performance and their ability to detect state corruptions in practice.

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Biteus, Jonas. "Fault Isolation in Distributed Embedded Systems." Doctoral thesis, Linköping : Vehicular Systems, Department of Electrical Engineering, Linköpings universitet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8774.

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MATUTTI, ALBERTO CORONADO. "ENERGY FLOW IN VIBRATION ISOLATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1951@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Sistemas de isolamento de vibrações são utilizados em uma grande variedade de aplicações (automóveis, edifícios, estruturas espaciais como aeronaves, satélites e em máquinas rotativas) para reduzir a transmissão de vibrações mecânicas geradas por equipamentos ou a eles transmitidas pela vizinhança. Um isolamento é obtido inserindo-se um componente mecânico (isolador) que desempenha o papel de vínculo entre o sub-sistema que contém a perturbação e o sub-sistema a ser isolado. Duas são as quantidades geralmente utilizadas para avaliar a efetividade de um sistema de isolamento: a transmissibilidade e a potência. Neste trabalho foi utilizada a potência, sendo esta uma metodologia mais geral que pode ser facilmente utilizada em sistemas complexos, mas que tem a desvantagem de ser de difícil avaliação experimental. Nesta tese, serão simulados numericamente vários sistemas de isolamento passivo por componentes rígidos ou flexíveis, os quais serão modelados por suas respectivas matrizes de mobilidade ou impedância. Estas matrizes serão obtidas por métodos analíticos ou numéricos dependendo da conveniência de cada caso específico. Os projetos tradicionais de sistemas de isolamento geralmente consideram uma excitação unidirecional e avaliam somente algumas componentes da resposta do sistema, isso devido as limitações impostas pelo conceito da transmisibilidde usados nesses projetos. Além disso, eles não dão a devida importância a alguns parâmetros essenciais de configuração geométrica do sistema (localização e ângulo de inclinação dos isoladores, localização dos apoios de base, etc.). No presente trabalho, será mostrada a relevância desses parâmetros mencionados anteriormente no processo de busca das configurações ótimas e também se verá como essas configurações são fortemente dependentes do tipo de excitação do sistema, para isso serão utilizadas combinações de excitações harmônicas multidirecionais.
Vibration isolation systems are used in a large variety of applications (automotive, buil- dings, spatial structures such as aircrafts, satellites and in rotating machines) in order to reduce the transmission of mechanical vibrations from the equipments toward the foun- ation or viceversa. An isolation is obtained inserting a mechanical component (isolator) that acts as a link between the source subsystem and the isolated subsystem. There are two quantities generally used to evaluate the e®ectiveness of a isolation system: the trans-missibility and the power transmitted. In this work, it has been used the power, being this the most generic methodology that can be easily used in complex systems, but it has the disadvantage of a di±cult experimental validation. In this thesis, it will be studied numerically several passive isolation systems with rigid or °exible components, these will be modeled by theirs mobility or impedance matrices. This matrices are achieved by analytical or numerical methods depending of the convenience in each case. Generally traditional projects of isolation systems consider a unidirectional excitation and evaluate only some components of the response system, this occurs for the limitations in the trans-missibility use. Moreover, they do not give an appropriate attention to some parameters of geometrical con¯guration of the system (location and angle inclination of the isolators, location of the base supports, etc.). Herein, it will be shown the relevance of this pa-rameters in the search process of optimal con¯gurations and it will be also see how they depend strongly on the kind of the system excitation, so it will be used some combinations of multidirectional harmonic excitations.
Los sistemas de aislamiento de vibraciones son utilizados en una gran variedad de aplicaciones (automóbiles, edificios, extructuras espaciales como aeronaves y en máquinas rotativas) para reducir la transmisión de vibraciones mecánicas generadas por los equipos. Se obtiene un aislamiento insertando un componente mecánico (aislante) que desempeña el papel de vínculo entre el subsistema que contiene la perturbación y el subsistema que se desea aislar. Generalmente son dos las cantidades utilizadas para evaluar la efectividad de un sistema de aislamiento: la transmisibilidad y la potencia. En este trabajo se utiliza la potencia, pués al ser una metodología más general, puede ser utilizada en sistemas complejos, pero tiene la desventaja de ser de díficil evaluación experimental. En esta tesis, serán simulados numéricamente varios sistemas de aislamiento pasivo por componentes rígidos o flexibles, que serán modelados por sus respectivas matrices de movilidad o impedancia. Estas matrices se obtendrán por métodos analíticos o numéricos según convenga. Los proyectos tradicionales de sistemas de aislamiento, debido a las limitaciones impuestas por el concepto de transmisibilidad utilizada, consideran una excitación unidireccional y evalúan solamente algunas componentes de la respuesta del sistema. Además de eso, ellos no dan la debida importancia a algunos parámetros escenciales de configuración geométrica del sistema (localización y ángulo de inclinación de los aislantes, localización de los apoyos de base, etc.). En este trabajo, se muestra la relevancia de los parámetros mencionados anteriormente en el proceso de búsqueda de las configuraciones óptimas y también se verá como esas configuraciones son fuertemente dependientes del tipo de exitación del sistema. Para esto se utilizaran combinaciones de exitaciones armónicas multidireccionales.

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SOARES, EDSON JOSE. "ENERGY SPREAD IN VIBRATION ISOLATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26507@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Muitas indústrias usam em seus processos materiais viscoplásticos. Esses materiais possuem propriedades que dependem fortemente da temperatura. Não é incomum encontrar processos envolvendo escoamentos não isotérmicos de materiais viscoplásticos. Nesses casos, informações sobre a transferência de calor são extremamente necessárias para um bom atendimento e aperfeiçoamento das operações. Fluidos de perfuração são tipicamente suspensões aquosas, e, por consequência, de natureza viscoplástica.Tais fluidos devem possuir densidade correta para manter a integridade física dos poços e evitar a produção prematura de hidrocarbonetos. Além disso, suas propriedades reológicas devem garantir a capacidade de arraste das partículas de rocha geradas durante o processo de perfuração, com um mínimo de potência de bombeamento. Tais particularidades requerem fluidos com baixas viscosidades a altas taxas de cisalhamento, que ocorrem em regiões próximas à parede, e altas viscosidades quando as taxas de deformação são baixas, o que ocorre na vizinhança do cascalho. Materiais viscoplásticos apresentam este tipo de comportamento. Portanto, o sucesso do processo de extração do petróleo depende do conhecimento e controle das propriedades reológicas dos fluidos de perfuração, as quais são fortemente dependentes da temperatura. Por esse motivo, a determinação do campo de temperatura no fluido de perfuração em escoamento faz-se necessária ainda em nível de projeto, o que só é possível com o conhecimento dos coeficientes de troca de calor. Estuda-se neste trabalho o problema da transferência de calor na região de entrada de escoamentos laminares de fluidos viscoplásticos através de espaços anulares. O comportamento do material é representado pelo modelo do fluido Newtoniano generalizado, com a função viscosidade descrita pela equação de Herschel-Bulkley. As equações de conservação são resolvidas numericamente via o método de volumes finitos. Investigam-se os efeitos (no coeficiente de troca de calor) da tensão limite de escoamento, índice power-law, razão de aspecto e dos números adimensionais de Reynolds e Peclet. Dentre outras conclusões, mostra-se que o números de Nusselt é uma função muito fraca das propriedades reológicas, desviando-se muito pouco dos valores Newtonianos. Surpreendentemente, esta conclusão contrasta-se fortemente com o comportamento observando em escoamentos de materiais viscoplásticos através de tubos. Convém enfatizar a importância desse fato no que tange a projetos de processos.
There are many industries that use in their processes viscoplastic materials. These materials have properties that strongly depend on temperature. It is not uncommon to find processes involving the non-isothermal flow of viscoplastic materials. For these cases, heat transfer information is needed to allow reliable process designs. Drilling muds are typically aqueous suspensions and, consequently, viscoplastic in nature. They must have the correct density to provide the pressure needed for well integrity, and for avoiding premature production of hydrocarbons. Their rheological properties must be such as to aloe carrying the drill chips with a minimum of pumping power. This requires a highly shear-thinning rheological behavior. Also, the success of a well cementing operation depends to a great extent on the knowledge and control of cement rheological properties, which are also temperature dependent. In this work, heat transfer in the entrance-region flow of viscoplastic materials through annular spaces is analyzed. The flow is laminar, and the material is assumed to behave as a Generalized Newtonian fluid, with a Herschel-Bulkley viscosity function. The conservation equations are solved numerically via a finite volume method. The effect on heat transfer of yield stress, power-law exponent, aspect ratio and dimensionless Peclet and Reynolds numbers is investigated. Among other findings, it is shown that the Nusselt number is a rather weak function of the rheological properties, deviating very little from the Newtonian values. Surprisingly, this stands in strong contrast to the behavior observed for flows of viscoplastic materials through tubes. It is worth noting that this finding has important consequences in process design.

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Ismail, Mohd. "Shock isolation systems incorporating Coulomb friction." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348953/.

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This study investigates a novel approach to the problem of shock isolation. The questions considered are whether friction produces a better performance in terms of reduced response during a shock compared to viscous damping and a lower residual response after the shock. To gain physical insight, a single degree of freedom model with friction applied to the isolated mass is analysed. It serves as a benchmark to the performance of a two degree of freedom model where friction is applied to a secondary mass. The isolation system performance is then quantified. For the two degree of freedom system with an intermediate secondary spring which connects the primary and secondary mass, it is possible to obtain the reduction in the displacement response as good as the single degree of freedom system and at the same time smoother acceleration response compared to the single degree of freedom system. For the purpose of further improvement, a control strategy is introduced to switch on and off friction in both models depending on some response parameters and this is compared to the passive systems. This is the semi active control strategy where friction is changed within a cycle of vibration (discontinuous). The control strategy provides more displacement reduction to ensure the maximum displacement response is much smaller than the base input which cannot be obtained with the passive systems. The practical implementation and experimental validation is presented only for the first stage of the response during the shock. For the practical implementation of the switchable friction, an electromagnet is applied to separate the friction surfaces. Good agreement with the simple theoretical models for both passive and switchable systems is obtained. The reduced displacement and smooth acceleration response were obtained from the experiments with the system used to represent the two degree of freedom model. The issues and limitations in the practical implementation are identified and discussed.

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Helal, Mohammad Rahat. "Efficient Isolation Enabled Role-Based Access Control for Database Systems." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501627843916302.

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Bryant, H. Victoria. "Modeling atomicity and isolation in workflow systems." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1400971431&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Yu, Dingli. "Fault diagnosis for industrial systems with emphasis on bilinear systems." Thesis, Coventry University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364163.

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Книги з теми "Isolation Systems"

Starkey, Steve. Base isolation bearings (Dynamic Isolation Systems, Inc.): Construction report. Salem, Or: Oregon Dept. of Transportation, Research Unit, 1998.

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Humphreys, M. Reliability study into subsea isolation systems. Sudbury: HSE Books, 1996.

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Biteus, Jonas. Fault isolation in distributed embedded systems. Linko ping, Sue cia: Linko pings Universitet. Department of Computer and Information Science, 2007.

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A, Furman F., and Rivin Eugene I, eds. Applied theory of vibration isolation systems. New York: Hemisphere Pub. Corp., 1990.

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Kemerlis, Vasileios. Protecting Commodity Operating Systems through Strong Kernel Isolation. [New York, N.Y.?]: [publisher not identified], 2015.

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Meskin, Nader. Fault Detection and Isolation: Multi-Vehicle Unmanned Systems. New York, NY: Springer Science+Business Media, LLC, 2011.

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R, Cramond Wallis, U.S. Nuclear Regulatory Commission. Division of Safety Issue Resolution., Sandia National Laboratories, and Science Applications International Corporation, eds. Risk assessment of isolation devices in safety systems. Washington, DC: Division of Safety Issue Resolution, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1993.

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Mayhew, Ellen R. Fault detection and isolation for reconfigurable flight control systems. New York: American Institute of Aeronautics and Astronautics, 1988.

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Center, Lewis Research, ed. Development and approach to low-frequency microgravity isolation systems. Washington, D.C: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Inc, Dynamic Isolation Systems, Highway Innovative Technology Evaluation Center (U.S.), and Civil Engineering Research Foundation, eds. Evaluation findings for Dynamic Isolation Systems, Inc. elastomeric bearings. Washington, DC: Civil Engineering Research Foundation, 1998.

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Частини книг з теми "Isolation Systems"

Kounev, Samuel, Klaus-Dieter Lange, and Jóakim von Kistowski. "Performance Isolation." In Systems Benchmarking, 341–64. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41705-5_16.

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Connor, Jerome, and Simon Laflamme. "Base Isolation Systems." In Structural Motion Engineering, 279–344. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06281-5_6.

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Fekete, Alan. "Snapshot Isolation." In Encyclopedia of Database Systems, 1–7. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4899-7993-3_346-2.

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Fekete, Alan. "Snapshot Isolation." In Encyclopedia of Database Systems, 2659–64. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-39940-9_346.

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Fekete, Alan. "Snapshot Isolation." In Encyclopedia of Database Systems, 3513–19. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4614-8265-9_346.

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Sippu, Seppo, and Eljas Soisalon-Soininen. "Transactional Isolation." In Data-Centric Systems and Applications, 101–24. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12292-2_5.

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Bernstein, Philip A. "SQL Isolation Levels." In Encyclopedia of Database Systems, 1–2. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4899-7993-3_366-2.

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Fekete, Alan. "Serializable Snapshot Isolation." In Encyclopedia of Database Systems, 1–4. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4899-7993-3_80774-1.

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Bernstein, Philip A. "SQL Isolation Levels." In Encyclopedia of Database Systems, 2761–62. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-39940-9_366.

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Bernstein, Philip A. "SQL Isolation Levels." In Encyclopedia of Database Systems, 3681–83. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4614-8265-9_366.

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Тези доповідей конференцій з теми "Isolation Systems"

Liu, Yanning, Yanchu Xu, and Bill Flynn. "Isolation and Vibration Transmission Reduction of Systems Mounted on a Flexible Structure." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48558.

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Issues addressed in this paper are related to the isolation and vibration transmission of vibration-sensitive systems mounted on a flexible support. The normal operation of certain electronic, optical and mechanical systems requires a vibration-free environment. To obtain such an environment, these systems are usually isolated from their supports with soft springs. When an array of such systems is needed, due to space constraints or other reasons, they are typically mounted on a common support, which in practice is flexible. Although such a design generally is effective in isolating vibration from ground support, vibration from one system, due to excitations other than from its support, can easily transmit to nearby systems. The level of the transmitted vibration (also known as vibration interaction) can be very significant, especially when all the systems are designed identically for simplicity and with less damping for effective ground vibration isolation. Isolator frequency separation (decoupling), viscous and viscoelastic damping are studied for the reduction of vibration transmission among the systems and their effects on system isolation are discussed. It is found that although the isolator frequency separation and viscous damping could be used for vibration transmission reduction among the isolated systems on the flexible support, the addition of viscoelastic damping reduces the vibration transmission without sacrificing their isolation performance. The difference between viscous and viscoelastic damping on ground vibration isolation is explained theoretically in the final part of the paper using a one degree of freedom model.

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Germann, Lawrence M., and Avanindra A. Gupta. "Active isolation systems." In Optical Engineering and Photonics in Aerospace Sensing, edited by George E. Sevaston and Richard H. Stanton. SPIE, 1993. http://dx.doi.org/10.1117/12.157077.

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Ponslet, E., and M. Eldred. "Discrete optimization of isolator locations for vibration isolation systems." In 6th Symposium on Multidisciplinary Analysis and Optimization. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-4178.

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Ramallo, J. C., E. A. Johnson, B. F. Spencer, Jr., and M. K. Sain. "``Smart'' Base Isolation Systems." In Structures Congress 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40492(2000)18.

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Tryggvason, Bjarni V., S. E. Salcudean, W. Y. Stewart, and N. Parker. "Microgravity Vibration Isolation Mount." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1994. http://dx.doi.org/10.4271/941364.

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Hunt, Tyler, Zhipeng Jia, Vance Miller, Christopher J. Rossbach, and Emmett Witchel. "Isolation and Beyond." In HotOS '19: Workshop on Hot Topics in Operating Systems. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3317550.3321427.

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Burtsev, Anton, Dan Appel, David Detweiler, Tianjiao Huang, Zhaofeng Li, Vikram Narayanan, and Gerd Zellweger. "Isolation in Rust." In SOSP '21: ACM SIGOPS 28th Symposium on Operating Systems Principles. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3477113.3487272.

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Scarborough, Lloyd H., Christopher D. Rahn, and Edward C. Smith. "Fluidic Composite Tunable Vibration Isolators." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3683.

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Coupling a Fluidic Flexible Matrix Composite (F2MC) to an air-pressurized fluid port produces a fundamentally new class of tunable vibration isolator. This device provides significant vibration reduction at an isolation frequency that can be tuned over a broad frequency range. The material properties and geometry of the F2MC element, as well as the port inertance, determine the isolation frequency. A unique feature of this device is that the port inertance depends on pressure so the isolation frequency can be adjusted by changing the air pressure. For constant port inertance, the isolation frequency is largely independent of the isolated mass so the device is robust to changes in load. A nonlinear model is developed to predict isolator length and port inertance. The model is linearized and the frequency response calculated. Experiments agree with theory, demonstrating a tunable isolation range from 9 Hz to 36 Hz and minimum transmitted force reductions of 90% at the isolation frequency.

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HORAK, D. "Isolation of unstructured system failures in dynamic systems." In Guidance, Navigation and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-3508.

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Mahmoudian, Pooya, and Reza Kashani. "Active Stiffness and Damping Control of Air Mounted/Suspended Systems." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66272.

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Passive mounts/springs with negligible damping and low stiffness are highly effective in isolating vibration but have poor shock isolation characteristics. This and other contradictory traits of passive mounts, make the realization of an ideal, uncompromised isolation system unfeasible. To avoid an isolation system design based on a compromise among its conflicting requirements, a degree of real-time, on-demand adjustability should be built into the mounting system. Air springs/mounts, because of their inherent adjustability, are the best candidate for such adjustable isolation; other passive mounts, e.g. elastomeric, would require the introduction of an additional active element/actuator to work in parallel with the mount. In this proposed adjustable air mounting system, shock isolation can be enhanced without undermining the vibration isolation effectiveness by using an on-demand, active damping scheme which adds various levels of damping to an air mounted/suspension application, e.g., the cab in a truck, depending on the instantaneous urgency of shock isolation over vibration isolation. In addition, the proposed adjustable isolation scheme contains an on-demand, active stiffness control working in parallel with the active damping scheme. Depending on the operating conditions, the stiffness of the mount will be lowered to better its vibration isolation or increased to enhance its shock isolation. The active damping and stiffness control along with other on-demand adjustment tactics for an air isolation system are described, numerically examined, and experimentally demonstrated.

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Звіти організацій з теми "Isolation Systems"

Yunovich. L52265 User Manual for Electrical Isolation Devices. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2004. http://dx.doi.org/10.55274/r0010183.

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There is no specific guidance available on the use of electrical isolation devices and how to protect against faults. Because of this, the practice of isolation is varied, which at times may lead to a possible loss of pipeline integrity or electrical safety hazards. Electrically isolating devices are common in cathodically protected piping systems. They can be used to electrically isolate the pipeline from terminal facilities and pumping systems, to divide the pipeline into sections for individual CP, or to manage stray current interference. NACE International defines these devices as an Electrical Isolating Joint. This document addresses the conditions when the use of isolating devices is indicated and outlines the conditions when installing an isolating device may either create an adverse condition or require additional measures (such as protective devices) to ensure the proper operation. Installation of electrical isolation (EI) devices may be a requirement for cathodically protected underground pipe. The primary purpose of the isolation is to open an electrical circuit formed by the protected structure and other metallic objects such as terminal facilities, pumping and compressor stations, metering stations, river crossings, etc.

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Pelto, P. J., K. R. Ames, and R. H. Gallucci. Reliability analysis of containment isolation systems. Office of Scientific and Technical Information (OSTI), June 1985. http://dx.doi.org/10.2172/5535425.

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Panas, C., and L. Siegel. Pandora Telescope Isolation Systems Engineering Project. Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1788330.

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Yan, Yiqun, Yi-Lung Mo, Farn-Yuh Menq, Kenneth H. Stokoe, II, Judy Perkins, and Yu Tang. Development of Seismic Isolation Systems Using Periodic Materials. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1183763.

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Ponslet, E. R., and M. S. Eldred. Discrete optimization of isolator locations for vibration isolation systems: An analytical and experimental investigation. Office of Scientific and Technical Information (OSTI), May 1996. http://dx.doi.org/10.2172/244592.

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Lee, B. S. The effects of aging on BWR core isolation cooling systems. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10192341.

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Trummer, D. J., and S. C. Sommer. Overview of seismic base isolation systems, applications, and performance during earthquakes. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10185638.

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Waymire, D. R. Current shock-isolation system theory and practice for Sandia instrumentation systems at the Nevada Test Site. Office of Scientific and Technical Information (OSTI), February 1989. http://dx.doi.org/10.2172/6176915.

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Shenton, Harry W. III. Guidelines for pre-qualification, prototype and quality control testing of seismic isolation systems. Gaithersburg, MD: National Institute of Standards and Technology, 1996. http://dx.doi.org/10.6028/nist.ir.5800.

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Bolisetti, Chandrakanth, Justin Coleman, William Hoffman, Andrew Whittaker, Sai Parsi, Jason Redd, Michael Cohen, et al. Seismic Isolation of Major Advanced Reactor Systems for Economic Improvement and Safety Assurance. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1690240.

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