scholarly journals A Clustering-Based Bubble Method for Generating High-Quality Tetrahedral Meshes of Geological Models

2020 ◽  
Vol 10 (15) ◽  
pp. 5292
Author(s):  
Bowen Wang ◽  
Yingjie Sun ◽  
Nengxiong Xu ◽  
Gang Mei
Keyword(s):  
Spatial Distribution ◽  
Tetrahedral Mesh ◽  
High Quality ◽  
Element Analysis ◽  
Triangulated Surface ◽  
Tetrahedral Meshes ◽  
Node Distribution ◽  
Geological Models ◽  
Point Set ◽  
Surface Meshes

High-quality mesh generation is critical in the finite element analysis of displacements and stabilities of geological bodies. In this paper, we propose a clustering-based bubble method for generating high-quality tetrahedral meshes of geological models. The proposed bubble method is conducted based on the spatial distribution of the point set of given surface meshes using the clustering method. First, the inputted geological models consisting of triangulated surface meshes are divided into several parts based on spatial distribution of point set, which can be used for the determination of the positions and radii of initial bubbles. Second, a procedure based on distance of nearby bubbles is used to obtain the initial size of bubbles. Third, by enforcing the forces acting on bubbles, all bubbles inside the 3D domain reach an equilibrium state by the motion control equations. Finally, the center nodes of the bubbles can form a high-quality node distribution in the domain, and then the required tetrahedral mesh is generated. Comparative benchmarks are presented to demonstrate that the proposed method is capable of generating highly well-shaped tetrahedral meshes of geological models.

scholarly journals Method for generating high-quality tetrahedral meshes of geological models by utilizing CGAL

MethodsX ◽  
2020 ◽  
Vol 7 ◽  
pp. 101061
Author(s):  
Bowen Wang ◽  
Gang Mei ◽  
Nengxiong Xu
Keyword(s):  
High Quality ◽  
Tetrahedral Meshes ◽  
Geological Models

scholarly journals Modeling the pelvic region for non-invasive pelvic intraoperative neuromonitoring

2016 ◽  
Vol 2 (1) ◽  
pp. 185-188 ◽  
Author(s):  
Tomasz Moszkowski ◽  
Thilo Krüger ◽  
Werner Kneist ◽  
Klaus-Peter Hoffmann
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Intraoperative Neuromonitoring ◽  
Tetrahedral Mesh ◽  
Mesorectal Excision ◽  
Element Analysis ◽  
Pelvic Region ◽  
Non Invasive ◽  
Muscle Tissues ◽  
Mesh Models

AbstractFinite element analysis (FEA) of electric current distribution in the pelvis minor may help to assess the usability of non-invasive surface stimulation for continuous pelvic intraoperative neuromonitoring. FEA requires generation of quality volumetric tetrahedral mesh geometry. This study proposes the generation of a suitable mesh based on MRI data. The resulting volumetric mesh models the autonomous nerve structures at risk during total mesorectal excision. The model also contains the bone, cartilage, fat, skin, muscle tissues of the pelvic region, and a set of electrodes for surface stimulation. The model is ready for finite element analysis of the discrete Maxwell’s equations.

Establishing 3D Mandible FEA Model via Clinical CT Images

2010 ◽  
Vol 44-47 ◽  
pp. 1952-1956 ◽  
Author(s):  
Wen Zheng Wu ◽  
Ya Dong Chen ◽  
Kun Peng Cui ◽  
Xing Jun Qin ◽  
Wan Shan Wang
Keyword(s):  
3D Model ◽  
Biomechanical Analysis ◽  
Mandible Reconstruction ◽  
Element Analysis ◽  
Boundary Constraints ◽  
Reconstruction Surgery ◽  
Tetrahedral Meshes ◽  
Fea Model ◽  
Tetrahedral Elements ◽  
Force Range

Aiming at the filature of titanium plates and screws after defective mandible reconstruction surgery, a method named Finite Element Analysis （FEA）was conducted in this paper through FEA software Abaqus with which a 3D model of defective mandible was established. The mandible 3D model was input into the Magics and remeshed. The mandible model was output in the format of .inp file from the Magics and import to Abaqus for converting from triangular meshes to tetrahedral meshes. The tetrahedral meshes totally had 71057 tetrahedral elements and 10720 nodes. The boundary constraints of the mandible 3D model were arranged. The force was applied separately in the direction of vertical, 15° and 30° with the occluding plane (teeth force range when occluding) to analyze the force. The mandible 3D model was established and prepared to be done a biomechanical analysis.

scholarly journals Finite Element Analysis of Damping Properties of High Strength Aluminum A356 Alloy Composite

2019 ◽  
Vol 8 (12S2) ◽  
pp. 298-300
Keyword(s):  
Silicon Content ◽  
A356 Alloy ◽  
High Strength ◽  
Mode Shapes ◽  
Damping Properties ◽  
High Quality ◽  
Element Analysis ◽  
Present Evaluation ◽  
Aluminum A356 Alloy ◽  
Numerical Examination

Aluminum composites are in reality notably used as a piece of various programs due to their tremendous load to quality homes. Many studies works had been finished to ponder and improve the mechanical houses of aluminum mixes. The formation of alloying segments anticipate a fundamental component in choosing the properties of a mix. The eventual results of numerical systems have been recognized via and massive as they eagerly facilitate with the check comes to fruition. In the present evaluation a numerical examination contraption i.E., restrained section examination (FEA) is used. The paintings presented in this paper is away for the examination of effect of vibration traits of aluminum blends of various sport plans. The displaying and evaluation is finished the usage of ANSYS programming. A secluded assessment is carried out to recognize the vibration direct i.E., trademark repeat and mode shapes, of the cloth considered. The mode shapes and fashionable Recurrence receive a essential part within the framework Of dynamic machines. The consonant evaluation has been made to choose repeat traits. The examination software scrutinizes the information from the records archive shapes the information and makes the yield document containing the nodal migrations and nodal stretch estimations of various nerves. From the examination it's miles assumed that as the copper and silicon content material within the amalgams grows winding decreases then again. ANSYS comes about insist the smallest Modulus twisting and a definitive tractable strengthincaseofthe380 mixes of 380 additions with the extension in copper and silicon content. Subsequently Al 380 amalgams show high-quality fine with least vibration.

scholarly journals Edelmetallgegenstände als Quellen zu sozialen Prozessen der Spätawarenzeit (8.–9. Jahrhundert n. Chr.)

2021 ◽  
Vol 72 (2) ◽  
pp. 417-452
Keyword(s):  
Spatial Distribution ◽  
Precious Metal ◽  
Eighth Century ◽  
Carpathian Basin ◽  
Early Medieval ◽  
High Quality ◽  
Cultural Changes ◽  
Archaeological Material ◽  
Metal Artefacts ◽  
The Social

Abstract The present paper analyses the precious metal artefacts, scarcely known in the huge archaeological material of the “late Avar period” (eighth to early ninth centuries AD). Unlike in the previous era the majority of the gold and silver objects of the late Avar period are stray finds; in particular high-quality goldsmith's artefacts are absent in the grave assemblages of the eighth century. The significance of precious metal objects in grave assemblages reached its low ebb around the middle of the late Avar period; afterwards not only new object types appeared but a new grave-horizon emerged comprising precious metal objects. This paper, based on the quality and morphology of the objects, their archaeological contexts as well as their spatial distribution, draws a conclusion concerning the social and cultural changes in the early medieval Carpathian Basin.

Identification of a Significantly Non-Proportionally Damped Structure Using Force Appropriation

1995 ◽  
Author(s):  
P. S. Holmes ◽  
J. R. Wright ◽  
J. E. Cooper
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Normal Mode ◽  
Normal Modes ◽  
Dynamic Tests ◽  
High Quality ◽  
Element Analysis ◽  
Standard Curve ◽  
Complex Modes ◽  
Phase Resonance

Abstract Dynamic tests were carried out on an aluminium plate with significant non-proportional damping applied via two oil filled dampers. Normal mode force appropriation (phase resonance) methods were used to measure the undamped normal modes of the plate and the results compared with corresponding complex modes obtained using a standard curve fitting (phase separation) approach. It is demonstrated that, as long as suitable excitation positions are chosen, high quality undamped normal modes can be identified while the curve fitted modes are highly complex. A Finite Element analysis of the plate was used to show how the results of normal mode force appropriation are directly comparable, particularly when damping is non-proportional.

Microscopic Spatial Distribution of Bound Excitons in High-Quality ZnO

2005 ◽  
pp. 1065-0
Author(s):  
F. Bertram ◽  
Daniel Forster ◽  
J. Christen ◽  
N. Oleynik ◽  
Armin Dadgar ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
High Quality

CT Based Three Dimensional Geometric Model of Cervical Spine

2013 ◽  
Vol 273 ◽  
pp. 588-592
Author(s):  
Zhi Yuan Yan ◽  
Dong Mei Wu ◽  
Li Tao Zhang ◽  
Jun Zhao
Keyword(s):  
Finite Element ◽  
Cervical Spine ◽  
Geometric Model ◽  
Three Dimensional ◽  
Element Model ◽  
Skeletal System ◽  
High Quality ◽  
Element Analysis ◽  
Dimensional Reconstruction ◽  
The Finite Element Model

In order to obtain high-quality analytical results of the finite element model, it is essential to construct a three dimensional geometric model. The paper reconstructed an accurate three dimensional geometric model of cervical spine segments (C4-C7). The process of reconstruction included three-dimensional reconstruction, smooth processing, contour generation, grid generation and fitting surface. Moreover, the result of reconstruction was evaluated ultimately. The model was validated to be smooth and reasonable, and could meet the requirements of finite element analysis. The method is not merely applied to reconstruct the geometric model of the cervical spine. It is a way to construct the model of the skeletal system of the human body.

Hexahedral Meshing of Subject-Specific Anatomic Structures Using Registered Building Blocks

2010 ◽  
Author(s):  
Amla Natarajan ◽  
Vincent A. Magnotta ◽  
Nicole M. Grosland
Keyword(s):  
Building Blocks ◽  
Tetrahedral Mesh ◽  
Computational Time ◽  
Patient Specific ◽  
Mesh Quality ◽  
High Quality ◽  
Subject Specific ◽  
Hexahedral Meshes ◽  
Mesh Generators ◽  
User Intervention

Generating high quality, subject-specific, 3D finite element anatomic models with minimal user-intervention remains a challenge. Numerous automated tetrahedral mesh generators are available, but hexahedral meshes are preferred due to their higher accuracy and faster computational time over tetrahedral meshes. Historically, the generation of hexahedral meshes for analysis is a tedious and time-consuming task. Therefore, the utilization of hexahedral meshes is often limited to baseline models that are powerful, but not patient-specific. Once a high quality mesh has been created, it would be ideal if it can be used to create meshes of similar surfaces from different subjects, without disrupting mesh quality.

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