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Generalized Swept Mid-structure for Polygonal Models

Tobias Martin, Guoning Chen, Suraj Musuvathy, Elaine Cohen, Charles Hansen
2012 Computer graphics forum (Print)  
Abstract We introduce a novel mid-structure called the generalized swept mid-structure (GSM) of a closed polygonal shape, and a framework to compute it.  ...  Figure 1: Pipeline for the Generalized Swept Mid-structure (GSM): (a) User choice of harmonic function. (b) Object is decomposed into (curved) slices, and a medial axis is computed for each slice.  ...  The authors would like to thank Jonathan Palacios for helping with the hexahedral meshing application.  ... 
doi:10.1111/j.1467-8659.2012.03061.x fatcat:q2msepiyt5ealam7z7ab4vvzli

SUBDIVISION SURFACE MID-SURFACE RECONSTRUCTION OF TOPOLOGY OPTIMIZATION RESULTS AND THIN-WALLED SHAPES USING SURFACE SKELETONS

Martin Denk, Klemens Rother, Kristin Paetzold
2021 Proceedings of the Design Society  
The final mid-surface-like parametrization is quite flexible and can be changed by variating the control gird or the local thickness.  ...  In engineering, such polygon meshes can occur as finite element meshes, resulting from topology optimization or laser scanning.  ...  Responsibility for the content of this publication lies with the authors.  ... 
doi:10.1017/pds.2021.538 fatcat:tdt332sxfra6hesb73amqqarxi

Research on the Vibration Insulation of High-Speed Train Bogies in Mid and High Frequency

Jia Liu, Xuesong Jin
2018 Shock and Vibration  
The related results may provide a reference for structure improvement of the existing bogies and structure design of the new high-speed bogies.  ...  In order to investigate the main cause of wheel higher-order polygon formation, a 3D flexible model of a Chinese high-speed train bogie is developed using the explicit finite element method.  ...  The model assumes that the small-scale roughness on the running surfaces of the wheel and rail is the primary mechanism for the force generation.  ... 
doi:10.1155/2018/6759105 fatcat:2tezmyhkkvdxjngfudxe2e5g6a

As-Built 3D Modeling of Large Facilities Based on Interactive Feature Editing

H. Masuda, Ichiro Tanaka
2010 Computer-Aided Design and Applications  
The grid mesh format is proposed for quick access to large-scale mesh models. A prototype system is implemented to show the efficiency of our method.  ...  In this paper, we propose a new modeling methodology which converts a point-cloud to a Mercator image and a mesh model, and enables reconstructing the missing portions interactively by using image-based  ...  ACKNOLEDGEMENTS This work was supported by Grant-in-Aid for Scientific Research. Example point-clouds are courtesy of Shinsei-Giken and FARO International Japan.  ... 
doi:10.3722/cadaps.2010.349-360 fatcat:j64jy6jm7ba3ng5kxquwkalnxu

Covering grids and orthogonal polygons with periscope guards

Laxmi P. Gewali, Simeon Ntafos
1993 Computational geometry  
Ntafos, Covering grids and orthogonal polygons with periscope guards,  ...  Acknowledgement We thank the referees for their helpful suggestions.  ...  We use the mid four segments of the generic path to complete the connection. The length of the fourth segment is always three.  ... 
doi:10.1016/0925-7721(93)90013-v fatcat:hml7mqw2crdybds6gx3uxtyvna

Assessment of the spatial structure and biomass evaluation ofNephrops norvegicus(L.) populations in the northwestern Mediterranean by geostatistics

F Maynou
1998 ICES Journal of Marine Science  
Relative experimental semivariograms were fitted to a spherical model.  ...  We conclude that the geostatistical analysis approach, which takes into consideration the spatial autocorrelation structure of the populations, is adequate for the direct biomass estimation and assessment  ...  Conan, senior research scientist from DFO, Canada, was sponsored by a personal award from the Direcció n General de Investigació n Científica y Técnica, DGICYT (Spanish Ministry of Education and Science  ... 
doi:10.1006/jmsc.1997.0236 fatcat:ziprebhymzdghkemsac62gxvoq

Triage polygonization of rounded polyhedra

Burkhard Wünsche, Richard Lobb
1999 The Visual Computer  
This paper describes a method for rounding and polygonizing edges and corners of polyhedral models to produce softer, more natural looking objects.  ...  The result is a highquality polygonization of the rounded polyhedron with none of the fragmentation problems of more general polygonization methods.  ...  The two lines s start p mid and s end p mid are candidates for a root search.  ... 
doi:10.1007/s003710050161 fatcat:bebavtv7ebevrn5znhx3luzary

Decomposing complex thin-walled CAD models for hexahedral-dominant meshing

Liang Sun, Christopher M. Tierney, Cecil G. Armstrong, Trevor T. Robinson
2018 Computer-Aided Design  
Careful consideration is given to the mapping, merging and intersection of face pairs to generate topologies suitable for sweep meshing the thin-sheet regions, and for treating the junctions between adjacent  ...  This paper describes an automatic method for identifying thin-sheet regions (regions with large lateral dimensions relative to the thickness) for complex thin-walled components, with a view to using this  ...  Acknowledgements The authors wish to acknowledge the financial support provided by Innovate UK: the work reported herein was funded via GHandI (TSB 101372), a UK Centre for Aerodynamics project.  ... 
doi:10.1016/j.cad.2017.11.004 fatcat:6uywthfabfcmfajs4vfdfu5msq

Generating Analysis Topology using Virtual Topology Operators

Christopher M. Tierney, Liang Sun, Trevor T. Robinson, Cecil G. Armstrong
2015 Procedia Engineering  
Virtual topology operations have been utilized to generate an analysis topology definition suitable for downstream mesh generation.  ...  A hierarchical virtual structure is maintained where virtual entities are merged or partitioned.  ...  Acknowledgements The authors wish to acknowledge the financial support provided by Innovate UK: the work reported herein was funded via GHandI (TSB 101372), a UK Centre for Aerodynamics project.  ... 
doi:10.1016/j.proeng.2015.10.135 fatcat:uvhpyalv3jcfxfkhy6xl55b5du

Design and Analysis of MEMS based Composite Piezoelectric Ultrasonic Transducer

T. Satyanarayana, G. Srinivas, M V V K Srinivas Prasad, Y. Srinivas, B. Sudheer, K. Srinivasa Rao
2013 Electrical and Electronic Engineering  
The present work reports the design and simulat ion of composite piezoelectric ultrasonic transducer, where susceptance was computed by applying AC potential for various piezoceramic materials i.e., Nepec  ...  The authors would also like to thank the Management & the Director of LBRCE, for providing us the necessary facilities.  ...  ACKNOWLEDGEMENTS The authors would like to thank NPMASS for the establishment of Nat ional M EMS Design Centre (NM DC) at Lakireddy Bali Reddy Autonomous Engineering College.  ... 
doi:10.5923/j.eee.20120206.04 fatcat:ziyaprar7vexjomjyhddhocpsq

Computing Optimal Homotopies over a Spiked Plane with Polygonal Boundary

Benjamin Burton, Erin Chambers, Marc Van Kreveld, Wouter Meulemans, Tim Ophelders, Bettina Speckmann, Marc Herbstritt
2017 European Symposium on Algorithms  
The algorithm combines structural properties of homotopies arising from the geometry with methodology for computing Fréchet distances.  ...  We describe a 2-approximation algorithm for the general case, and an optimal algorithm for the case that the two boundaries for which we seek a morph share both endpoints, thereby representing the entire  ...  We repeat the process from γ t , until we reach γ mid . Analogously, E S A 2 0 1 7 23:6 Computing Optimal Homotopies over a Spiked Plane with Polygonal Boundary we shrink γ 1 to γ mid .  ... 
doi:10.4230/lipics.esa.2017.23 dblp:conf/esa/BurtonCKMOS17 fatcat:tltyqyrvafeqrlitqfqim4fzru

Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP near Hawaii

D. Sun, D. Helmberger, V. H. Lai, M. Gurnis, J. M. Jackson, H.-Y. Yang
2019 Geophysical Research Letters  
However, their detailed structure near slab-like structures beneath the mid-Pacific remains particularly challenging because of the lack of station coverage.  ...  In this study, we identify a new seismic signal, multi-pathing of ScS, which can be modelled with a ultra-low velocity zone sitting at the far edge of the mid-Pacific large low shear velocity province.  ...  We thank the IRIS Data Center and Earthscope USArray for  ... 
doi:10.1029/2018gl081130 fatcat:wdrewx3qsvh5zkfwnkfvqjtmqq

FINDING POPULAR PLACES

MARC BENKERT, BOJAN DJORDJEVIC, JOACHIM GUDMUNDSSON, THOMAS WOLLE
2010 International journal of computational geometry and applications  
Widespread availability of location aware devices (such as GPS receivers) promotes capture of detailed movement trajectories of people, animals, vehicles and other moving objects, opening new options for  ...  Acknowledgements We would like to thank Hans Bodlaender, Jyrki Katajainen, Damian Merrick and Anh Pham for very useful discussions.  ...  For each segment s of Λ consider the region swept along s by the unit-square σ. This region is a polygon P (s) with at most six edges, see Figure 6 (c).  ... 
doi:10.1142/s0218195910003189 fatcat:asn4j4bmhfhq3klanptheggo3m

High-speed OCT light sources and systems [Invited]

Thomas Klein, Robert Huber
2017 Biomedical Optics Express  
New developments in wavelength-swept lasers have repeatedly been crucial for this development.  ...  In this review, we discuss the historical evolution and current state of the art of high-speed OCT systems, with focus on wavelength swept light sources and swept source OCT systems.  ...  In general, these lasers have a fundamental speed limit, since, in a simple model, lasing has to build up for every wavelength separately [59] .  ... 
doi:10.1364/boe.8.000828 pmid:28270988 pmcid:PMC5330584 fatcat:w5p2ea4fobasniibpdpljz5puu

Education-driven research in CAD

Jarek Rossignac
2004 Computer-Aided Design  
We illustrate the concept of EDR with three examples in CAD: (1) the Split&Tweak subdivisions of a polygon and its use for generating curves, surfaces, and animations; (2) the construction of a topological  ...  particular, in these examples, EDR has allowed the author to: (1) reduce the cost of evaluating a cubic B-spline curve; (2) develop a new subdivision curve that is better approximated by its control polygon  ...  [Luff04] developed with Processing from which the illustrations in Fig. 4 were produced and to Jessie Shieh for providing the web-based applet, which was used to generate Figs. 5 and 6.  ... 
doi:10.1016/j.cad.2003.10.008 fatcat:qfp7pnk2c5f63adljjmr37fkoi
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