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Heavy liquid metal natural circulation in a one-dimensional loop

NUCLEAR engineering AND DESIGN 2011年第5期241卷 1301-1309页

作者： Coccoluto, G. Gaggini, P. Labanti, V. Tarantino, M. Ambrosini, W. Forgione, N. Napoli, A. Oriolo, F. ENEA Brasimone I-40032 Camugnano BO Italy Univ Pisa Dipartimento Ingn Meccan Nucl & Prod I-56126 Pisa Italy

the ENEA Brasimone Research Centre since 1999 is strongly involved in the national and european research programmes performed in the field of heavy liquid metal technology aiming at the development of critical (LFR) and subcritical (ADS) nuclear systems. In particular, in the frame of the IP-EUROTRANS, (6th Framework Program EU), ENEA assumed the commitment to perform an integral experiment with the aim to reproduce the primary flow path of a HLM pool-type nuclear reactor, cooled by lead bismuth eutectics (LBE). this new experimental activity, named ICE "Integral Circulation Experiment", will be performed by an appropriate test section designed to be installed in the CIRCE facility. In order to support the ICE activity, as well as characterize the natural and gas enhanced circulation flow regimes in a HLM loop, qualify test procedures and components which are nuclear relevant, a new facility was designed and built-up by Brasimone Research Centre, named NACIE "NAtural Circulation Experiment". the paper reports a detailed description of the loop and the main experimental results carried out from the natural circulation tests already performed on the NACIE loop. numerical simulations have been performed in collaboration with the University of Pisa, adopting the RELAP5/Mod3.3 system code modified to allow for LBE as a cooling fluid. the aim of the performed post-test calculations is to compare the code response with the experimental results under the natural circulation flow regime, allowing to qualify the adopted nodalization as well as the performance of the code when employed on HLM loop. (C) 2010 Elsevier B.V. All rights reserved.

关键词： LIQUID metals RESEARCH institutes NUCLEAR engineering PHYSICS experiments NUCLEAR reactors NUCLEAR facilities numerical analysis SIMULATION methods & models

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Robust ℍ∞ filtering for nonuniformly sampled systems

Robust ℍ∞ filtering for nonuniformly sampled systems

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2011 50th IEEE conference on Decision and Control and european Control conference, CDC-ECC 2011

作者： Mustafa, Ghulam Chen, Tongwen Fujioka, Hisaya Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2V4 Canada Department of Applied Analysis and Complex Dynamical Systems Graduate School of Informatics Kyoto University Kyoto 606-8501 Japan

ISBN: (纸本)9781612848006

We consider the design of a robust ℍ∞ filter for sampled-data systems whose measurements are sampled at uncertain and nonuniform sampling instants. A discrete-time, fixed-structure filter is considered. the resulting error system is time-varying, which makes the filter design difficult. A procedure is presented to design the filter so that the error system remains asymptotically stable for all possible variations of the sampling period with an ℍ∞ performance level. the effectiveness of the proposed method is demonstrated through numerical examples. © 2011 IEEE.

关键词： numerical methods

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Open issues in tunnel boring machine excavation of deep tunnels

Open issues in tunnel boring machine excavation of deep tunn...

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14th Australasian Tunnelling conference 2011: Development of Underground Space

作者： Barla, G. Janutolo, M. Zhao, K. Politecnico di Torino Department of Structural and Geotechnical Engineering Corso Duca degli Abruzzi 24 10129 Torino Italy

ISBN: (纸本)9781921522376

In Europe, a major interest in the infrastructure and tunnelling fields is in the new crossings of Alps in the form of base tunnels, which are important components of the high-speed (for passengers)/high-capacity (for freight) Trans european railway corridors. these tunnels cross the mountain belt at the elevation of the main cities and basins located all around the Alps and are longer (up to 57 km) and deeper (up to 2500 m) than all tunnels constructed in the centuries before. the excavation of the first Alpine railway and road traffic tunnels could in general be carried out successfully by conventional excavation methods. With the great lengths of the new base tunnels, mechanised excavation by using tunnel boring machines (TBMs) is imperative as it contributes significantly to savings in construction time and costs. Questions are however posed on the adoption of such a systematic tunnel construction method given the severe ground conditions which are some time anticipated along the tunnel alignment, with possible major geological hazards such as water inflow in heterogeneous fractured or karstified rock masses, stress-induced tensile failure of hard rocks, and plastic shear failure and squeezing of weak rocks, etc. this lecture is to briefly review the current state-of-the-art in the understanding and modelling of two such critical hazards as spalling/bursting and squeezing ground behaviour. With the present interest in the design of mechanised tunnelling with TBMs in such conditions, the complex interaction between the rock mass, the tunnel machine and its system components, and the tunnel support is studied in detail by numerical modelling. the research and development efforts presently underway with the intention to provide the designer with a novel three-dimensional (3D) simulator of mechanised tunnel excavation are presented. Case examples are discussed with reference to the Lyon-Turin Base Tunnel design.

关键词： Rocks

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the use of statistical image classification techniques for the assessment of measured antenna pattern functions

The use of statistical image classification techniques for t...

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作者： McCormick, J. Gregson, S.F. Parini, C.G. Selex Galileo Crewe Toll Edinburgh EH5 2XS United Kingdom Nearfield Systems Inc. 19730 Magellan Drive Torrance CA 90502 United States Queen Mary University of London School of Electronic Engineering and Computer Science Mile End Road London E1 4NS United Kingdom

ISBN: (纸本)9788882020743

Attempts to produce robust, objective, quantitative measures of similarity between antenna pattern data sets using statistical methods have been widely reported in the open literature [1, 2, 3, 4, 5]. this paper presents an introduction to the physical validity and use of generalised statistical analysis along with specialist statistical image classification concepts as applied to the assessment of antenna pattern functions. Before presenting results the paper describes some of the more recent developments in the field relating to, nominal, ordinal, interval and the more usual ratio type levels of measurement data available within near-field measurement data sets. Finally the paper describes how these assessment techniques could be implemented in a formal gage repeatability and reproducibility (R&R) [6] numerical quality analysis of a measurement system. © 2011 EurAAP.

关键词： Directional patterns (antenna)

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System Identification Based on Variational Bayes Method and the Invariance under Coordinate Transformations

System Identification Based on Variational Bayes Method and ...

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IEEE conference on Decision and Control

作者： Kenji Fujimoto Akinori Satoh Shuichi Fukunaga Department of Mechanical Science and Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Tokyo Metropolitan College of Industrial Technology 1-1-40 Higashioi Shinagawa-ku Tokyo Japan

ISBN: (纸本)9781612848006

this paper proposes a parameter estimation method for state-space models based on the variational Bayes method. We adopt the same form of functions as the prior and posterior probability distributions so that we can be used it iteratively to obtain accurate estimation whereas the existing algorithms cannot be used iteratively. Furthermore, the proposed algorithm is invariant under coordinate transformations, in the sense that the posterior probabilities of state-space models similar to each other are equivalent. Moreover, a numerical example demonstrates the effectiveness of the proposed method.

关键词： Coordinate transformations Bayes methods System identification a posteriori probability Probability distribution invariance Invariant

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the Use of Statistical Image Classification Techniques for the Assessment of Measured Antenna Pattern Functions

The Use of Statistical Image Classification Techniques for t...

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european conference on Antennas and Propagation

作者： J. McCormick S. F. Gregson C. G. Parini Selex Galileo Crewe Toll Nearfield Systems Inc. Queen Mary University of London School of Electronic Engineering & Computer Science

ISBN: (纸本)9781457702501

关键词： antenna radiation patterns measurement data Image classification measurement system similar measure Quality analysis Statistical methods

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Control-Oriented Modeling of the Electron Cyclotron Current Drive Actuated Hybrid Mode in ITER

Control-Oriented Modeling of the Electron Cyclotron Current ...

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IEEE conference on Decision and Control

作者： Snezana Djordjevic Maarten Steinbuch Marco de Baar Dick Hogeweij Jonathan Citrin Eindhoven University of Technology Faculty of Mechanical Engineering Control Systems Technology PO Box 513 5600 MB Eindhoven The Netherlands FOM-Institute for Plasma Physics Rijnhuizen Association EURATOM-FOM Trilateral Euregio Cluster P.O. Box 1207 3430 BE Nieuwegein The Netherlands

ISBN: (纸本)9781612848006

this paper presents a control-oriented model of the magnetic flux in the International Tokamak Experimental Reactor (ITER) actuated with Electron Cyclotron Current Drive (ECCD) at different locations. the main objective of the control-oriented modeling is to derive an input/output representation of the magnetic profile written as a state-space model. the state-space model allows determination of the most suitable actuation strategies using the concept of controllability analysis. To illustrate the controllability analysis of the magnetic flux actuated at different locations, we present numerical results based on space dependent parameters obtained from the integrated modeling code CRONOS.

关键词： Object oriented modeling electron cyclotron current drive magnetic profiles Hybrid modes State space models State-space methods Models, Space Modeling controllability ITER TOKAMAK

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Calibration and verification of numerical model of ground improved by dynamic replacement

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Kwiecien, S. Silesian University of Technology Gliwice Poland

ISBN: (纸本)9780415592390

Dimensioning of driven stone columns on the basis of the existing methods may raise certain doubts. It is due to underestimation of their load capacity and overestimation of their settlement. the alternative solution could be a computational numerical model of subsoil strengthened with the use of dynamic replacement method, which is presented in this paper. © 2010 Taylor & Francis Group, London.

关键词： numerical models

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Analysis of dynamic penetration of objects into soil layers

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Carter, J.P. Nazem, M. Centre for Geotechnical and Materials Modelling University of Newcastle NSW Australia

ISBN: (纸本)9780415592390

Finite element analysis of the penetration of a solid object into a soil layer is probably one of the most sophisticated and challenging problems in numerical analysis. In this study the Arbitrary Lagrangian- Eulerian method is employed to study numerically the penetration of a free falling penetrometer into a layer of soil. It is shown that this method can simulate deep penetration of objects into layers of soil accurately. Good agreement has been found between the numerical predictions and experimental results. © 2010 Taylor & Francis Group, London.

关键词： Soils

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Associated plasticity for nonassociated frictional materials

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Krabbenhoft, Kristian Lyamin, Andrei V. Sloan, Scott W. Centre for Geotechnical and Materials Modelling University of Newcastle NSW Australia

ISBN: (纸本)9780415592390

A new computational plasticity scheme for nonassociated frictional materials is presented. While general, it relies solely on well established concepts of associated plasticity. the new scheme is applied to some common boundary value problems for which the consequences of nonassociated flow rules in terms of localization of deformations are highlighted. © 2010 Taylor & Francis Group, London.

关键词： Plasticity

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