Towards CAD-Less Finite Element Analysis Using Group Boundaries for Enriched Meshes Manipulation

2009 ◽  
Author(s):  
R. Lou ◽  
F. Giannini ◽  
J-P. Pernot ◽  
A. Mikchevitch ◽  
B. Falcidieno ◽  
...  
Keyword(s):  
Finite Element ◽  
Physical Object ◽  
Cad Model ◽  
Element Analysis ◽  
Group Boundaries ◽  
Semantic Data ◽  
Mesh Model ◽  
Cad Models ◽  
Set Up ◽  
Definition Of

Nowadays, most of the numerical simulations are carried out by successively performing the following steps: CAD model definition or modification, conversion to a mesh model and enrichment with semantic data relative to the simulation (e.g. material behaviour laws, boundary conditions), Finite Element simulation and analysis of the results. Classically, the semantic data are attached to the mesh through the use of groups of geometric entities sharing the same characteristics. Thus, any modification of the CAD model always implies an update of the mesh as well as an update of the attached semantic data. This is time-consuming and not adapted to the context of industrial maintenance. Moreover, the CAD models do not always exist and should therefore be reconstructed starting from scratch or from the physical object. In this paper, we set up a framework towards the definition of CAD-less Finite Element analyses wherein enriched meshes are manipulated directly. The geometric manipulations are constrained with information extracted from the group definition. Actually, the boundaries of those groups are exploited to constrain the modifications. The concept of Virtual Group Boundaries is introduced to focus on the extension of the attached semantic information instead of the actual tessellation while generalising the approach to groups of any dimension going from 0D (vertex) to 3D (e.g. tetrahedron). The notion of Elementary Group is also introduced as a mean to ease the forthcoming transfer of the semantics from the initial to the modified models. Such a framework also finds interest in the preliminary design phases where alternative solutions have to be evaluated.

scholarly journals Shape Sensing of a Complex Aeronautical Structure with Inverse Finite Element Method

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1388
Author(s):  
Daniele Oboe ◽  
Luca Colombo ◽  
Claudio Sbarufatti ◽  
Marco Giglio
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Strain Field ◽  
Element Analysis ◽  
Inverse Finite Element Method ◽  
Shape Sensing ◽  
Definition Of ◽  
High Level ◽  
Element Method

The inverse Finite Element Method (iFEM) is receiving more attention for shape sensing due to its independence from the material properties and the external load. However, a proper definition of the model geometry with its boundary conditions is required, together with the acquisition of the structure’s strain field with optimized sensor networks. The iFEM model definition is not trivial in the case of complex structures, in particular, if sensors are not applied on the whole structure allowing just a partial definition of the input strain field. To overcome this issue, this research proposes a simplified iFEM model in which the geometrical complexity is reduced and boundary conditions are tuned with the superimposition of the effects to behave as the real structure. The procedure is assessed for a complex aeronautical structure, where the reference displacement field is first computed in a numerical framework with input strains coming from a direct finite element analysis, confirming the effectiveness of the iFEM based on a simplified geometry. Finally, the model is fed with experimentally acquired strain measurements and the performance of the method is assessed in presence of a high level of uncertainty.

Application of ANSYS in Grid Structure

2012 ◽  
Vol 271-272 ◽  
pp. 705-709
Author(s):  
Hong Jiang Chen ◽  
Yue Hai Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Grid Structure ◽  
Element Analysis ◽  
Space Truss ◽  
Design Function ◽  
Bar Buckling ◽  
Reasonable Choice ◽  
Definition Of

Space grid structure of modern large span structure engineering in the most commonly used structure form. This paper used ANSYS network space truss finite element analysis, discuss the element type, and the selection of material models, and the definition of the limit stress, when necessary, even considering the bar buckling state ( buckling ). Under various load (permanent loads, wind loads, seismic loads, under the action of gravity ), using the powerful finite element analysis software ANSYS on the structure static analysis, after the use of ANSYS powerful optimization design function, the structure safety, the bar section optimization design, and then on the basis of the existing rod a cross section, a reasonable choice of bar section, reduce the material consumption, to achieve the best economic, reasonable design, implementation can develop continuously, make the satisfactory design.

scholarly journals MANUFACTURE OF A DIE PROTOTYPE FOR DIDACTIC PURPOSES IN MECHATRONIC ENGINEERING

2020 ◽  
pp. 1-40
Author(s):  
ELIEL EDUARDO MONTIJO-VALENZUELA ◽  
SAUL DANIEL DURAN-JIMENEZ ◽  
LUIS ALBERTO ALTAMIRANO-RÍOS ◽  
JOSÉ ISAEL PÉREZ-GÓMEZ ◽  
OSCAR SALMÓN-AROCHI
Keyword(s):  
Mechanical Design ◽  
Theoretical Calculations ◽  
Low Cost ◽  
Die Design ◽  
Element Analysis ◽  
Technological Institute ◽  
Computer Aided ◽  
Cad Models ◽  
Functional Prototype ◽  
Definition Of

The objective of this research is to manufacture a prototype of a teaching die for the specialty of precision mechanical design in mechatronic engineering, in order to achieve the skills required in unit two, regarding dies. The methodology used consists of five stages: 1. Definition of the preliminary conditions. 2. Theoretical calculations for die design. 3. Design, modeling and assembly using computer-aided software (CAD) of the parts that make up the die. 4. Validation with simulation of finite element analysis (AEF). 5. Manufacture of parts and physical assembly of the die. A functional prototype was obtained with which the teacher and student can perform calculations, designs and CAD models, AEF analysis of the static and fatigue type, manufacture of rapid prototypes using 3D printing, the identification of the parts that make up a die and their functioning. The advantage of this prototype, compared to metal die-cutting machines, is its low cost of production and manufacturing, it does not require expensive and specialized machinery for manufacturing, specific designs can be made by the students and its subsequent manufacture within the laboratories of the Technological Institute of Hermosillo.

scholarly journals Filleting sharp edges of multi-partitioned volume finite element meshes

2015 ◽  
Vol 32 (1) ◽  
pp. 129-154
Author(s):  
Ruding Lou ◽  
Jean-Philippe Pernot ◽  
Franca Giannini ◽  
Philippe Veron ◽  
Bianca Falcidieno
Keyword(s):  
Finite Element ◽  
Semantic Information ◽  
Tetrahedral Mesh ◽  
Content Type ◽  
Analysis Process ◽  
Cad Modelling ◽  
Cad Models ◽  
Sharp Edges ◽  
Set Up ◽  
New Framework

Purpose – The purpose of this paper is to set up a new framework to enable direct modifications of volume meshes enriched with semantic information associated to multiple partitions. An instance of filleting operator is prototyped under this framework and presented in the paper. Design/methodology/approach – In this paper, a generic mesh modification operator has been designed and a new instance of this operator for filleting finite element (FE) sharp edges of tetrahedral multi-partitioned meshes is also pro-posed. The filleting operator works in two main steps. The outer skin of the tetrahedral mesh is first deformed to round user-specified sharp edges while satisfying constraints relative to the shape of the so-called Virtual Group Boundaries. Then, in the filleting area, the positions of the inner nodes are relaxed to improve the aspect ratio of the mesh elements. Findings – The classical mainstream methodology for product behaviour optimization involves the repetition of four steps: CAD modelling, meshing of CAD models, enrichment of models with FE simulation semantics and FEA. This paper highlights how this methodology could be simplified by two steps: simulation model modification and FEA. The authors set up a new framework to enable direct modifications of volume meshes enriched with semantic information associated to multiple partitions and the corresponding fillet operator is devised. Research limitations/implications – The proposed framework shows only a paradigm of direct modifications of semantic enriched meshes. It could be further more improved by adding or changing the modules inside. The fillet operator does not take into account the exact radius imposed by user. With this proposed fillet operator the mesh element density may not be enough high to obtain wished smoothness. Originality/value – This paper fulfils an identified industry need to speed up the product behaviour analysis process by directly modifying the simulation semantic enriched meshes.

Onvex Partitioning Approach for the Construction of Solid Model From Measured Point Data

1998 ◽  
Author(s):  
V. Devaraja Holla ◽  
S. S. Krishnan ◽  
B. Gurumoorthy
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solid Model ◽  
Planar Surface ◽  
Element Analysis ◽  
Final Model ◽  
Convex Partition ◽  
Point Data ◽  
Definition Of ◽  
The Individual

Abstract This paper describes an algorithm for the construction of solid model from measured point data using Convex Partitioning approach. Convex Partitioning approach is based on the idea that any non-convex body can be viewed as a combination of several convex pieces. The input constitutes a set or cluster of points, measured on each face of the object, which is obtained by scanning the part. Points in each cluster are used to fit a plane or a non-planar surface depending upon the type of face. Partitioning is done along the planes till one gets all the convex pieces. The individual convex pieces are then combined together to get the final model of the object. The definition of convex partition is relaxed for objects having curved faces, to be an object with all its edges convex. Apart from allowing the construction of solid model from measured point data, the output (convex pieces) obtained from this approach is useful in planning for rapid prototyping and feature suppression in finite element analysis.

Simulation Research on SUV Passenger Car Rear End Impact

2012 ◽  
Vol 490-495 ◽  
pp. 1645-1649
Author(s):  
Xi Ting Wang ◽  
Yi Feng Zhao ◽  
Xue Jiao Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cad Model ◽  
Similar Model ◽  
Passenger Vehicle ◽  
Element Analysis ◽  
Simulation Research ◽  
Safety Regulations ◽  
Motion Characteristics ◽  
Main Components

The simulation model of some SUV passenger vehicle rear end impact is created in the paper aimed at the furnished vehicle CAD model of some SUV passenger vehicle, using the principle of finite element analysis; according to the relevant test regulations on vehicle rear-end impact. The motion characteristics of rear-end impact, the effect of overall energy absorption, absorption and buffer characteristics of main components, safety of fuel tank and ride safety of crew are analyzed and discussed deeply. The characteristics of collision and the degree of accordance with the safety regulations on vehicle rear-end impact of the vehicle are comprehensively revealed. Moreover, some improved suggestions is proposed, the basis for promoting the rear-end impact safety of similar model is discussed.

Designing, Manufacturing and FEA Analyzing of a Intervertebral Disc Made from UHMWPE

2019 ◽  
Vol 957 ◽  
pp. 427-436
Author(s):  
Corneliu Nicolae Druga ◽  
Ileana Constanta Rosca ◽  
Radu Necula
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Intervertebral Disc ◽  
Rapid Prototyping ◽  
Intervertebral Disk ◽  
Cad Model ◽  
Element Analysis ◽  
Fea Analysis

The paper presents a series of aspects regarding the design, manufacturing (through Rapid Prototyping) and FEA analysis of an intervertebral disk made from UHMWPE. In the first part are presented the most used model existing on the market. The CAD model and Finite Element Analysis (FEA) of the intervertebral disc (IVD) were made using the SolidWorks program. As a material, UHMWPE has been preferred due to good mechanical and biocompatibility characteristics.

Finite Element Analysis and Topology Optimization of the Clamping Unit in a Two-Platen Injection Machine

2011 ◽  
Vol 117-119 ◽  
pp. 1535-1542 ◽  
Author(s):  
Hua Wei Zhang ◽  
Wei Xia ◽  
Zhi Heng Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Element Model ◽  
Molding Machine ◽  
Element Analysis ◽  
And Topology ◽  
The Finite Element Analysis ◽  
Set Up ◽  
The Finite Element Model

In this paper, the clamping unit of a two-platen injection molding machine was modeled by Pro/ENGINEER, and was imported to Altair HyperWorks. In HyperMesh module, the finite element model was set up, ANSYS has been used in the finite element analysis of the clamping unit and the deformation and stress results were obtained. Based on the topology optimization of HyperWorks/OptiStruct, recommendations to improve the structure of the clamping mechanism are presented; the results showed that less material was used while its performance was maintained.

Finite Element Analysis on Integral Structure of Light Steel Temporary Buildings

2013 ◽  
Vol 405-408 ◽  
pp. 921-924
Author(s):  
Xue Feng Cai ◽  
Zheng Zhang ◽  
Yong Chao Ma ◽  
Ji Zhong Zhou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simple Structure ◽  
Lateral Displacement ◽  
Structure Model ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Integral Structure ◽  
Set Up

Light steel temporary building is commonly used in the construction site, with advantages on simple structure, repeat used and small deadweight. There are still not enough researches and relevant standards to conduct the design and construction of the buildings. In order to precede to theoretical study on integral structure of light steel temporary buildings a method which used to set up finite element analysis model about integral structure of light steel temporary buildings was proposed in this paper. The method is based on finite element analysis software, Ansys. Using this method a monolayer integral structure, a two-story integral structure and a trilaminar integral structure model were set up. Lateral displacement under design load of the integral structure was solved out by these finite element models.

Finite Element Analysis of Ship Lock Chamber Structure

2014 ◽  
Vol 1065-1069 ◽  
pp. 597-600
Author(s):  
Chao Sun ◽  
Zi Chang Shang Guan ◽  
Xiao Xuan Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Base Plate ◽  
3D Models ◽  
Element Analysis ◽  
Calculation Process ◽  
Lock Chamber ◽  
Set Up ◽  
Ship Lock

While considering various structural and material requirements, 3D models of ship chambers in the ship lock structure using finite element modeling (FEM) software ANSYS. By using FEM software to set up the contacting sections between the base plate, refilled soils and foundation, analyses were done to caluculate the forces exerted on the structure of the ship chamber. After checking the reasonability of the calculated results, discussions were made on the calculation process to allow for future empirical calculations.

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