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IEEE Conference on Electromagnetic Field Computation

作者： Ahmed Khebir Paweł Dłotko Bernard Kapidani Ammar Kouki Ruben Specogna EMWorks Inc. Lasalle Québec Canada DataShape Inria Saclay Palaiseau France Polytechnic Department of Engineering and Architecture University of Udine Udine Italy Ecole de Technologie Superieure Montreal Québec Canada

This paper extends the T-Ω formulation for eddy currents based on higher order hierarchical basis functions so that it can deal with conductors of arbitrary topology. To this aim we supplement the classical hierarchical basis functions with non-local basis functions spanning the first de Rham cohomology group of the insulating region. Such non-local basis functions may be efficiently found in negligible time with the recently introduced DS algorithm.

关键词： Generators Conductors Eddy currents Topology Computer architecture Manifolds Benchmark testing

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Probabilistic seismic demand analysis of buildings equipped with nonlinear viscous dampers

Probabilistic seismic demand analysis of buildings equipped ...

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作者： Dall'asta, A. Ragni, L. Tubaldi, E. School of Architecture and Design University of Camerino Ascoli Piceno Italy Department of Civil Engineering Construction and Architecture Polytechnic University of Marche Ancona Italy

Viscous dampers are energy dissipation devices widely employed for the seismic control of new and existing building frames. To date, the performance of systems equipped with viscous dampers has been extensively analyzed by employing deterministic approaches neglecting the response dispersion due to the site seismic hazard condition and the record-to-record variability effects. This paper analyzes the probabilistic seismic performance of building frames equipped with viscous dampers by highlighting the influence of damper properties. In particular, a probabilistic methodology based on response hazard curves is employed to evaluate the effect of the damper nonlinearity, measured by the damper exponent, on the performance of structural and non-structural components of building frames, as described by the response hazard curves of the relevant engineering demand parameters. A case study consisting of a steel frame equipped with nonlinear viscous dampers is considered and the performance variations due to changes in the damper nonlinearity level are evaluated by considering design scenarios corresponding to dampers having different exponents designed to provide the same deterministic performance. Both response statistics at different seismic intensity levels and demand hazard curves for the monitored engineering parameters are employed as performance measures. It is shown that the damper nonlinearity strongly affects the seismic performance and different trends are observed for the various demand parameters of interest. A comparison with code provisions shows that further investigation is necessary to provide more reliable design formulas for the dampers accounting for their nonlinearity level. © Civil-Comp Press, 2015.

关键词： Seismic response

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Probabilistic seismic demand analysis of buildings equipped with nonlinear Viscous dampers

Probabilistic seismic demand analysis of buildings equipped ...

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15th International Conference on Civil, Structural and Environmental engineering Computing, CIVIL-COMP 2015

关键词： Seismic response

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A comparative performance analysis of time-domain formulations for wave propagation problems

A comparative performance analysis of time-domain formulatio...

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IEEE Conference on Electromagnetic Field Computation

作者： Matteo Cicuttin Lorenzo Codecasa Bernard Kapidani Ruben Specogna Francesco Trevisan Ecole des Ponts ParisTech (ENPC) Université Paris-Est Marne-la-Vallee France Dip. di Elettronica Politecnico di Milano Milano Italy Department of Engineering and Architecture University of Udine Polytechnic Udine Italy

This paper presents an analysis of the performances of competing approaches in the numerical solution of wave propagation problems in the time domain, with focus on the advantages of an approach based on a FD-TD schem... 详细信息

ISBN: (纸本)9781509010332

关键词： Finite element analysis Transmission line matrix methods Time-domain analysis Propagation Performance analysis Computer architecture Convergence

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Experimental and Numerical Investigation of an End Plate Connection with Using Long Shank SMA Bolts

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Journal of Harbin Institute of Technology(New Series) 2015年第3期22卷 22-30页

作者： Hongwei Ma Yongbing Zhu Michael C.H.Yam Yang Wang School of Civil Engineering and Transportation South China University of Technology State Key Laboratory of Subtropical Architecture Science South China University of Technology Department of Building and Real Estate The Hong Kong Polytechnic University

Superelastic shape memory alloys( SMAs) have the ability to recover their original shape after experiencing large strains. End-plate connection with using superelastic long shank SMA bolts is proposed in this paper. By using strong beam-weak bolt cluster design methodology and special configurations to strength beam ends,a superelastic hinge is expected to form in column flange. To validate the mechanical behavior of the proposed beam-to-column connection,both quasi-static tests and numerical analysis are conducted with cyclic transverse loads applied on the beam ends. The results indicate the connection deformations concentrate on the long shank SMA bolts upon loading and the bolt cluster rotates around the axis near beam flange. By using the super elastic effect,the SMA bolts recover most elongations and the connection recovers to its original shape after experiencing 0. 02 rad interstorey drift angle. The connection shows obvious self-centering properties.

关键词： finite element connection shape memory alloy ductility self-centering

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Measurement of Λ(1520) production in pp collisions at √s = 7 TeV and p–Pb collisions at √sNN = 5.02 TeV

arXiv

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arXiv 2019年

作者： Acharya, S. Adamová, D. Adhya, S.P. Adler, A. Adolfsson, J. Aggarwal, M.M. Rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Molina, R. Alfaro Ali, B. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arratia, M. Arsene, I.C. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bai, X. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Balouza, S. Baral, R.C. Barbera, R. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bauri, D. Alba, J.L. Bazo Bearden, I.G. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bellwied, R. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Besoiu, M.G. Betev, L. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhatt, H. Bhattacharjee, B. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Borel, H. Borissov, A. Borri, M. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buncic, P. Buthelezi, Z. Butt, J.B. Buxton, J.T. Bysiak, S.A. Caffarri, D. Caliva, A. Villar, E. Calvo Camacho, R.S. Camerini, P. Capon, A.A. Carnesecchi, F. Caron, R. Castellanos, J. Castillo Castro, A.J. Casula, E.A.R. Catalano, F. Sanchez, C. Ceballos Dipartimento DET del Politecnico di Torino Turin Italy iii M.V. Lomonosov Moscow State University D.V. Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute of Theoretical Physics University of Wroclaw Poland Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russia California Polytechnic State University San Luis ObispoCA United States Central China Normal University Wuhan China Centre de Calcul de l’IN2P3 Villeurbanne Lyon France Havana Cuba Mexico City and Mérida Mexico Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi’ Rome Italy Chicago State University ChicagoIL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju United Kingdom Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad Islamabad Pakistan Creighton University OmahaNE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan Korea Republic of Department of Physics Sejong University Seoul Korea Republic of Department of Physics University of California BerkeleyCA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell’Università’La Sapienza’ and Sezione INFN Rome Italy Dipartimento di Fisica dell’Università and Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INF

The production of the Λ(1520) baryonic resonance has been measured at midrapidity in inelastic pp collisions at √s = 7 TeV and in p–Pb collisions at √sNN = 5.02 TeV for non-single diffractive events and in multiplicity classes. The resonance is reconstructed through its hadronic decay channel Λ(1520) → pK− and the charge conjugate with the ALICE detector. The integrated yields and mean transverse momenta are calculated from the measured transverse momentum distributions in pp and p–Pb collisions. The mean transverse momenta follow mass ordering as previously observed for other hyperons in the same collision systems. A Blast-Wave function constrained by other light hadrons (π, K, K0S, p, Λ) describes the shape of the Λ(1520) transverse momentum distribution up to 3.5 GeV/c in p–Pb collisions. In the framework of this model, this observation suggests that the Λ(1520) resonance participates in the same collective radial flow as other light hadrons. The ratio of the yield of Λ(1520) to the yield of the ground state particle Λ remains constant as a function of charged-particle multiplicity, suggesting that there is no net effect of the hadronic phase in p–Pb collisions on the Λ(1520) yield. Copyright © 2019, The Authors. All rights reserved.

关键词： Wave functions

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SIG Contribution in the Making of Geotechnical Maps in Urban Areas

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IOP Conference Series: Materials Science and engineering 2017年第2期245卷

作者： António Monteiro Luís Andrade Pais Carlos Rodrigues Paulo Carvalho Technical Scientific Unit of Engineering and Technology Research Unit for Inland Development Polytechnic Institute of Guarda School of Technology and Management Av.a Dr. Francisco Sá Carneiro n 50 6300-559 Guarda Portugal Department of Civil Engineering and Architecture Beira Interior University Geobiotec Covilhã Portugal

The use of Geographic Information Systems (GIS) has spread to several science areas, from oceanography to geotechnics. Its application in the urban mapping was intensified in the last century, which allowed a great development, due to the use of geographic database, new analysis tools and, more recently, free open source software. Geotechnical cartography struggle with a permanent and large environment re-organization in urban area, due to new building construction, trenching and the drilling of sampling wells and holes. This creates an extra important and largest volume of data at any pre-existence geological map. The main problem results on the fact that the natural environment is covered with buildings and communications system. The purpose of this work is to create a viable geographic information base for geotechnical mapping through a free GIS computer program and open source, with non-traditional cartographic sources, giving preference to open platforms. QGIS was used as software and 'Google Maps', 'Bing Maps' and 'OpenStreetMap' were applied as cartographic sources using the 'OpenLayers plugin' module. Finally, we also pretend to identify and delimit the degree of granite's change and fracturing areas using a 'Streetview' platform. This model has cartographic input which are a geological map study area, open cartographic web archives and the use of 'Streetview' platform. The output has several layouts, such as topography intersection (roads, borders, etc.), with geological map and the bordering area of Guarda Urban Zone. The use of this platform types decrease the collect data time and, sometimes, a careful observation of pictures that were taken during excavations may reveal important details for geological mapping in the study area.

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Seismic response assessment of base-isolated bridges accounting for the stress-softening behaviour of high damping natural rubber bearings 15

Seismic response assessment of base-isolated bridges account...

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15th International Conference on Civil, Structural and Environmental engineering Computing, CIVIL-COMP 2015

作者： Tubaldi, E. Ahmadi, H. Muhr, A. Ragni, L. Dall'asta, A. School of Architecture and Design University of Camerino Italy Tun Abdul Razak Research Centre Brickendonbury United Kingdom Department of Civil Engineering Construction and Architecture Polytechnic University of Marche Italy

In the last few decades, high damping natural rubber (HDNR) bearings have been extensively employed for seismic isolation of bridges and buildings because of their low horizontal stiffness and high damping capacity, which allows shifting the vibration period of the isolated structure away from where the earthquake input has the highest energy content and at the same time controlling the motion of the system. In HDNR material, filler is added to the natural rubber in order to improve its properties such as stiffness and dissipative capacity. The addition of the filler induces also a stress-softening behaviour, known as "Mullins effect". This effect makes the response of HDNR bearings path-history dependent and thus may influence the seismic performance of isolated systems. Published literature has shown that the initial "virgin" properties of the material are recovered. Accordingly, current seismic codes make the assumption that "Mullins effect" is a reversible phenomenon. Thus, they suggest simplified methods based on the use of property modification factors for the bearing model properties to account for this effect in the seismic response evaluation of structures isolated with HDNR bearings. The present paper is a study of the consequences of such strain-history dependent behaviour on the seismic response of structural systems isolated with HDNR bearings. In particular, the bearing behaviour is described by a non-linear processdependent constitutive model based on one previously developed. This model allows separation of the contribution to the response due to the path-history dependent component from the contribution resulting from the stable (scragged) component. The model properties are calibrated against double-shear tests carried out on HDNR compounds commonly employed for seismic isolators. In particular, the response of a realistic isolated bridge is analyzed under ground motions with different characteristics by considering two different conditions for the

关键词： Seismic response

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A geometric frequency-domain wave propagation formulation for fast convergence of iterative solvers

A geometric frequency-domain wave propagation formulation fo...

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IEEE Conference on Electromagnetic Field Computation

作者： Matteo Cicuttin Lorenzo Codecasa Ruben Specogna Francesco Trevisan Ecole des Ponts ParisTech (ENPC) Université Paris-Est Marne-la-Vallée France Dip. di Elettronica Politecnico di Milano Milano Italy Polytechnic Department of Engineering and Architecture University of Udine Udine Italy

ISBN: (纸本)9781509010332

The frequency-domain wave propagation problem is notoriously difficult to solve through iterative methods, because of the huge nullspace of the curl-curl operator. Direct methods are then usually employed, at the expense of great memory usage. Accelerated convergence of iterative methods can be obtained by a modification of the wave equation. In this paper, we introduce the modified wave equation in the Discrete Geometric Approach (DGA) framework. Moreover, the impedance boundary condition in the formulation is presented, together with a smart assembly technique that allows to greatly reduce the memory requirements.

关键词： Convergence Frequency-domain analysis Propagation Acceleration Impedance Boundary conditions Transmission line matrix methods

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Topoprocessor: An efficient computational topology toolbox for h-oriented eddy current formulations

Topoprocessor: An efficient computational topology toolbox f...

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IEEE Conference on Electromagnetic Field Computation

作者： Pawei Diotko Bernard Kapidani Ruben Specogna Inria Centre de Recherche Saclay-Ile-de-France Palaiseau ÃŽle-de-France FR Polytechnic Department of Engineering and Architecture University of Udine Udine Italy Universita degli Studi di Udine Udine Friuli-Venezia Giulia IT

ISBN: (纸本)9781509010332

When solving eddy-current problems containing topologically non-trivial conductors with formulations using the magnetic scalar potential in the insulators, cohomology is recognized to be the only safe tool to obtain a well posed problem. This paper presents an efficient implementation of the recently introduced DS algorithm to compute the first lazy cohomology group generators of a tetrahedral mesh. The code will be available for download on request for non-profit use. Secondly, for the first time, the computational time required by the proposed toolbox for the topological pre-processing is compared with another freely available alternative on the same input mesh.

关键词： Eddy currents Generators Heating Magnetic domains Algorithm design and analysis Electron tubes Software algorithms

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