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Geometric modeling of tubular structures

M. Akif Gulsun, Huseyin Tek
2008 2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops  
The main contribution of the method is its ability to extract center axis of tubular shapes which may contain boundary noise, holes, gaps and attachment of nearby structures or pathologies due to the errors  ...  These filters are designed from the assumption that tubular structures, in general, has circular shapes in cross-sectional views.  ...  Introduction Geometric modeling of tubular structures from medical images such as contrast enhanced (CE) Computer Tomography Angiography(CTA) and Magnetic Resonance Angiography (MRA) is still an important  ... 
doi:10.1109/cvprw.2008.4562994 dblp:conf/cvpr/GulsunT08 fatcat:kc3nab64ebcappwhdi47ccjvvm

Effect of geometric parameters and combined loading on stress distribution of tubular T-joints

Samira Belhour, Hafida Kahoul, Ahmed Bellaouar, Sébastien Murer
2019 Mechanics  
This study is devoted to the modeling and analysis of T-type welded tubular structures for the determination of hot spots stresses (HSS) at the chord/brace intersection, A numerical analysis was carried  ...  Steel tubular structures are widely used in the construction of offshore platforms and T-type junctions are extensively used in this domain.  ...  Significant aspects of tubular junctions The points of saddle and crown are remarkable geometric points in the junction zones of simple tubular assemblies of marine structures, where the usual loads reveal  ... 
doi:10.5755/j01.mech.25.5.20543 fatcat:vmpekpb3m5cphexyw6g2cer35e

Stress Concentration Factors for Multi-planar Tubular Joints Subjected to Axial Loading

Kai Zhou, Jingjing Zuo, Wenhua Wang, Shiliu Bao, X. Wei
2020 E3S Web of Conferences  
The finite element models of three-planar tubular Y-joints are established and used to calculate hot spot stresses.  ...  The tubular joints are the weakest component leading to fatigue failure of the whole structure.  ...  Acknowledgement This research was supported by the National Natural Science Foundation of China (Grant No. 52001052).  ... 
doi:10.1051/e3sconf/202021303014 fatcat:dc7klqspezhfhnljmqbav2vubu

Degree Of Bending In Axially Loaded Tubular Kt-Joints Of Offshore Structures: Parametric Study And Formulation

Hamid Ahmadi, Shadi Asoodeh
2015 Zenodo  
The tubular KTjoint is a quite common joint type found in steel offshore structures.  ...  In the present paper, data extracted from finite element (FE) analyses of tubular KT-joints, verified against experimental data and parametric equations, was used to investigate the effects of geometrical  ...  INTRODUCTION FFSHORE jacket structures are composed of circular hollow section (CHS) members, also called tubulars.  ... 
doi:10.5281/zenodo.1107006 fatcat:5chzyklnibhidculawmgtzodvi

A Probability Distribution Model for the Degree of Bending In Tubular KT-Joints of Offshore Jacket-Type Platforms Subjected To IPB Moment Loadings

Hamid Ahmadi, Vahid Mayeli, Esmaeil Zavvar, University of Tabriz, University of Tabriz, University of Tabriz
2019 International Journal of coastal and offshore engineering  
The objective of present research was the derivation of probability density functions (PDFs) for the degree of bending (DoB) in tubular KT-joints commonly found in jacket-type platforms.  ...  A total of 243 finite element (FE) analyses were carried out on 81 FE models of KT-joints subjected to three types of in-plane bending (IPB) moment loading.  ...  Acknowledgments Useful comments of anonymous reviewers on draft version of this paper are highly appreciated.  ... 
doi:10.29252/ijcoe.3.2.11 fatcat:wzq7hdeekjalxesetibtam3ujq

Simulation and Computational Study of CFD on Tube MBR Membrane Assembly

Kun Feng, Chunqing Li, Ming Zhang, Xuting Liu, Zi-Peng Wang
2021 Discrete Dynamics in Nature and Society  
The MBR model of a single membrane filament tube was established using the ICEM CFD preprocessor in ANSYS 16.0, and the structured grid was divided to obtain a grid file.  ...  This research realizes the purpose of calculating the water yield of the tubular MBR system with CFD technology, solves the problem of evaluating the working efficiency of the tubular MBR system with water  ...  of the geometric model.  ... 
doi:10.1155/2021/5577715 fatcat:rv7xil5p6bhpbejpk5x4wuo4ty

Adaptive mesh generation procedures for thin-walled tubular structures

C.K. Lee, S.P. Chiew, S.T. Lie, T.B.N. Nguyen
2010 Finite elements in analysis and design  
In this paper, a family of adaptive mesh generation schemes specially designed for finite element modelling of structural hollow section (SHS) tubular joint is presented.  ...  The underlying geometrical models provide the definitions of different levels of geometrical details and special features that could appear at different stages of the life cycle of the structure.  ...  One typical example is the modelling of structural hollow section (SHS) tubular joints which are extensively used in offshore engineering.  ... 
doi:10.1016/j.finel.2009.06.011 fatcat:xecr2odei5egvjztre4vycrnle

Stress Concentration Factor of A Two-Planar Double KT Tubular Joint due to In-Plane Bending Loading in Steel Offshore Structures

Prastianto Rudi Walujo, Hadiwidodo Yoyok Setyo, Fuadi Ibnu Fasyin, Suntoyo, Agro Wisudawan
2018 MATEC Web of Conferences  
The tubular joint is modelled as finite element models with bending loads acting on the braces that cover a wide range of dimensionless geometrical parameters (β, τ, ).  ...  Validation of the finite element model has shown good agreement to the global structural analysis results.  ...  The authors wish to thank Institute for Research and Community Services (LPPM), Institut Teknologi Sepuluh Nopember (ITS) Surabaya for the financial support through a research grant scheme of "Laboratory  ... 
doi:10.1051/matecconf/201817701006 fatcat:aeoh6fco4zgyrkbyecvrgpogba

Structural System in Resisting the Effect of Lateral Load in High Rise Building

Varun S P, B. S. Sureshchandra
2019 Zenodo  
In the structural systems of high rise buildings there are a multitude of structural systems forms, such as twisted, tilted, tapered and free forms.  ...  This is an attempt to evaluate the effectiveness of this system for G 30 Steel structure.. The characteristics of buildings with very complex geometry and that use the diagrid system are presented.  ...  ACKNOWLEDGEMENTS I am very much thankful to my guide B S SURESH CHANDRA (ASSOCIATE PROFESSOR) for their guidance and also very much thankful to Structural Engineering Department, Faculty of Dr.  ... 
doi:10.5281/zenodo.3587430 fatcat:3zhjwrpyjvdjtfloxpxrn2nkfq

PARAMETRIC STUDY OF OUTER-BRACE SCFS IN RIGHTANGLE TWO-PLANAR TUBULAR DKT-JOINTS OF OFFSHORE JACKET STRUCTURES

H. AHMADI, M.A. LOTFOLLAHI-YAGHIN1, A. AMINFAR
2015 Journal of Engineering Science and Technology  
Significant effort has been devoted by researchers to the study of SCFs in various uni-planar tubular connections.  ...  In the present paper, a set of parametric FE stress analyses is carried out for two-planar welded tubular DKT-joints under two different axial load cases.  ...  Multi-planar joints are an intrinsic feature of offshore tubular structures.  ... 
doaj:4eaed8632dc241818b9204dbb82de393 fatcat:pm5homqiync35plzjt6grxlpbu

Deep Distance Transform for Tubular Structure Segmentation in CT Scans [article]

Yan Wang, Xu Wei, Fengze Liu, Jieneng Chen, Yuyin Zhou, Wei Shen, Elliot K. Fishman, Alan L. Yuille
2019 arXiv   pre-print
provides a geometrical measurement for a tubular structure, which is important for clinical diagnosis (e.g., the cross-sectional scale of a pancreatic duct can be an indicator for pancreatic cancer).  ...  Tubular structure segmentation in medical images, e.g., segmenting vessels in CT scans, serves as a vital step in the use of computers to aid in screening early stages of related diseases.  ...  and g k v encodes the geometric characteristics of the tubular structure.  ... 
arXiv:1912.03383v1 fatcat:qrmfsodty5fzrid5v45r6vbkfe

A Geometric Modeling of Tracheal Elements of the Chard (Beta vulgaris) Leaf

K. ARSLAN, B. BULCA, C. ÖZDEMIR, A. ÖZDEMIR, B. BOZDAG
2019 Planta Daninha  
ABSTRACT: In this study, we give a geometric description of the tracheal elements of the chard (Beta vulgaris var. cicla L.), which is a widespread cultivated plant in Turkey.  ...  We have shown that the tracheal elements, which are taxonomic value of the plant, can be considered as a surface of revolution or a tubular shape along a special curve.  ...  Secondly, we construct a geometric model for the spiral type tracheal element of the chard leaf. We describe this type of shapes as a tubular surfaces over a curve helix where .  ... 
doi:10.1590/s0100-83582019370100118 fatcat:my7x3f2ngvcvpnnexkc2o6dbjm

Outer-Brace Stress Concentration Factors Of Offshore Two-Planar Tubular Dkt-Joints

Mohammad Ali Lotfollahi-Yaghin, Hamid Ahmadi
2012 Zenodo  
Significant effort has been devoted by researchers to the study of SCFs in various uniplanar tubular connections.  ...  In the present paper, a set of parametric FE stress analyses is carried out for two-planar welded tubular DKT-joints under two different axial load cases.  ...  Hence, the developed equations can reliably be used for fatigue design of offshore structures.  ... 
doi:10.5281/zenodo.1056818 fatcat:qvtu6zd7djcg7hhbxb4l2s7lj4

Static Strength of Tubular T-joint with Reinforced Chord Under In-plane Bending Load

Song Shengzhi
2011 The Open Ocean Engineering Journal  
Afterwards, 4 T-joint models are analyzed to prove that increasing the thickness of the chord is effective to increase the static strength.  ...  Recent research on the static strength of axially loaded tubular T-joints with chord reinforcement shows that appropriately proportioned reinforced length and thickness can significantly improve the static  ...  Effect of on the in-plane bending capacity (T=10, =0.6). Fig. ( 1 1 ). Geometrical model of tubular T-joint with chord un-reinforced and reinforced. Fig. ( 2 2 ). Mesh of a tubular T-joint.  ... 
doi:10.2174/1874835x01104010065 fatcat:2oesvfazkjc7zo7dnrsoligrfa

Finite element simulations to evaluate deformation of polyester tubular braided structures

Jerry Ochola, Benny Malengier, Lode Daelemans, Lieva Van Langenhove
2016 Textile research journal  
Realistic geometrical structures were developed for mechanical modeling of tubular braids in terms of tensile loads, elongation, radial contraction and braid angle.  ...  Mechanical modeling, which provides an in-depth understanding of the deformation mechanism of structures, plays an important role in designing structural changes in tubular braids.  ...  In this regard, this study presents realistic geometrical models and simulation of tubular braided structure deformation under uniaxial quasi-static loading with the aim of studying the influence of the  ... 
doi:10.1177/0040517516651106 fatcat:lgwpffuawbhzvncc2gqwmnirhm
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