Application of Grid-Based Approach for Auto Mesh Generation of Vacuum Chamber

2006 ◽  
Vol 306-308 ◽  
pp. 631-636 ◽  
Author(s):  
Young Jae Park ◽  
H.K. Kim ◽  
Yoon Suk Chang ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Finite Element ◽  
Mesh Generation ◽  
Vacuum Chamber ◽  
Complex Geometry ◽  
Industrial Applications ◽  
Cad Model ◽  
Finite Element Analyses ◽  
Mesh Quality ◽  
Modeling Process ◽  
Grid Based

A seamless analysis of complex geometry is one of greatly interesting topic. However, there are still gaps between the industrial applications and fundamental academic studies owing to time consuming modeling process. To resolve this problem, an auto mesh generation program based on grid-based approach has been developed for IT-product in the present study. At first, base mesh and skin mesh are generated using the information of entities which extracted from IGES file. Secondly the provisional core mesh with rugged boundary geometry is constructed by superimposing the skin mesh as well as the base mesh generated from the CAD model. Finally, the positions of boundary nodes are adjusted to make a qualified mesh by adapting node modification and smoothing techniques. Also, for the sake of verification of mesh quality, the hexahedral auto mesh constructed by the program is compared with the corresponding tetrahedral free mesh and hexahedral mapped mesh through static finite element analyses. Thereby, it is anticipated that the grid-based approach can be used as a promising pre-processor for integrity evaluation of various IT-products.

Application of Modified Grid-Based Approach for Auto Mesh Generation of IT-Related Products

2006 ◽  
Vol 321-323 ◽  
pp. 12-15
Author(s):  
Young Jae Park ◽  
Byung Sun Kim ◽  
Han Ok Ko ◽  
Yoon Suk Chang ◽  
Jae Boong Choi ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Product Design ◽  
Mesh Generation ◽  
Industrial Application ◽  
Complex Geometry ◽  
Cellular Phone ◽  
Rough Boundary ◽  
Cad Model ◽  
Exact Geometry ◽  
Grid Based

A seamless analysis of IT-related products, such as cellular phone, LCD monitor and note PC etc., which are thin and complex geometry is one of great concerns in product design. However, there is a considerable amount of gap between the industrial application and fundamental academic studies due to a time consuming detailed mesh generation. In order to settle the bottleneck, an auto mesh generation program based on a modified grid-based approach is proposed in this paper. At first, base mesh and skin mesh were generated using informations on entities which extracted from an IGES (Initial Graphics Exchange Specification) file. Secondly, a provisional core mesh with a rough boundary geometry was constructed by superimposing the skin mesh into the base mesh generated from CAD model. And then, positions of boundary nodes were redistributed to delineate exact geometry of the provisional mesh. Finally, good qualified meshes were constructed by moving the positions of the nodes and splitting elements along boundary edges. In conclusion, it is anticipated that the developed program can be used as a promising pre-processor for static or dynamic analysis of various IT-related products.

Computer-Aided Reliability Finite Element Methods

1991 ◽  
Vol 34 (5) ◽  
pp. 46-52
Author(s):  
David Followell ◽  
Salvatore Liguore ◽  
Rigo Perez ◽  
W. Yates ◽  
William Bocchi
Keyword(s):  
Finite Element ◽  
Stress Relaxation ◽  
Finite Element Methods ◽  
Mesh Generation ◽  
Electronic Equipment ◽  
Finite Element Analyses ◽  
Elastic Plastic ◽  
Computer Aided

Finite element analyses (FEA) have emerged as a process for assessing stresses and strains in electronic equipment in order to compute the expected structural life. However, potential pitfalls may compromise accuracy. Guidelines have been established to improve the accuracy of these results. A method has been outlined that allows simplified linear FEAs to be used instead of the more complex elastic-plastic nonlinear FEA. Guidelines for mesh generation have been established to eliminate arithmetic errors caused when materials with large stiffness differences are adjacent to each other. The accuracy of FEAs when dealing with very small dimensions has been verified. Procedures for combining various loadings in order to predict life have been established for materials that exhibit stress relaxation and for those that do not. With these guidelines, FEAs can be an effective tool to predict the structural life of electronic equipment.

Substructure Coupling of Microend Mills to Aid in the Suppression of Chatter

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Brock A. Mascardelli ◽  
Simon S. Park ◽  
Theodor Freiheit
Keyword(s):  
Finite Element ◽  
Complex Geometry ◽  
Rotational Dynamics ◽  
Response Functions ◽  
Finite Element Analyses ◽  
Coupling Technique ◽  
Good Surface ◽  
Receptance Coupling ◽  
Milling Tool ◽  
Microend Milling

Microend milling offers the ability to machine microparts of complex geometry relatively quickly when compared with photolithographic techniques. The key to good surface quality is the minimization of tool chatter. This requires an understanding of the milling tool and the milling structure system dynamics. However, impact hammer testing cannot be applied directly to the prediction of tool tip dynamics because microend mills are fragile, with tip diameters as small as 10μm. This paper investigates the application of the receptance coupling technique to mathematically couple the spindle/micromachine and arbitrary microtools with different geometries. The frequency response functions (FRFs) of the spindle/micromachine tool are measured experimentally through impact hammer testing, utilizing laser displacement and capacitance sensors. The dynamics of an arbitrary tool substructure are determined through modal finite element analyses. Joint rotational dynamics are indirectly determined through experimentally measuring the FRFs of gauge tools. From the FRFs, chatter conditions are predicted and verified through micromilling experiments.

Application of Grid-Based Approach for Auto Mesh Generation of Vacuum Chamber

2006 ◽  
pp. 631-636
Author(s):  
Young Jae Park ◽  
H.K. Kim ◽  
Yoon Suk Chang ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Mesh Generation ◽  
Vacuum Chamber ◽  
Grid Based

Mechanical behavior of pressurized composite pipes made of various materials

2020 ◽  
Vol 62 (4) ◽  
pp. 389-394
Author(s):  
İsmail Yasin Sülü ◽  
Şemsettin Temiz
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Radial Strain ◽  
Experimental Tests ◽  
Industrial Applications ◽  
Layered Composite ◽  
Finite Element Analyses ◽  
Reinforced Composite ◽  
Failure Loads ◽  
Composite Pipes

Abstract In this study, multi-layered composite pipes with varied orientation angles and subjected to internal pressure were investigated by using the 3-D finite element method (FEM) and through experimental tests. The composite pipes were made of E-glass and T300/934 carbon fiber. The studies were carried out experimentally, analytically and numerically. The T300/934 carbon fiber reinforced composite pipes and E-glass reinforced composite pipes were given numerical model codes via ANSYS 14.5 software. These models were then compared with analytical results in the literature and with the experimental results. Finite element analyses (FEA) were carried out to predict failure loads. Each layer of the composite pipes was numerically examined from various orientation angles. Hoop and shear stress wereobtained numerically for each layer. Radial strain and radial stress were achieved in the radial direction of the composite pipes. Shear extension coupling was considered because the layup angles with + θ and - θ layers were in varied radii. Subsequently, the effects of the orientation angles were examined for all models. Moreover, it was found that an embedded adhesive joint is important for industrial applications.

On the Development of Blend Faces and Holes Recognition Algorithm for CAE Applications

2015 ◽  
Vol 656-657 ◽  
pp. 789-794 ◽  
Author(s):  
Jiing Yih Lai ◽  
Zi Wei You ◽  
Yu Kai Chiu ◽  
Ming Hsuan Wang ◽  
Chia Hsiang Hsu ◽  
...  
Keyword(s):  
Finite Element ◽  
Mesh Generation ◽  
Computational Efficiency ◽  
Recognition Algorithm ◽  
Cad Model ◽  
Key Factors ◽  
Factors Affecting ◽  
3D Cad ◽  
Cad Models

Mesh generation is one of the key factors affecting computational efficiency and accuracy in finite element analysis.More and more software provides modules for automatic meshes generation. Owing to the complexity and variety of the shape on a CAD model, it needs the recognition of specific features to enhance the success of meshes generation. Holes are one of the fundamental features in 3D CAD models and appear in various types of form. The aim of this study is to present a method for the recognition of different kinds of holes. The primary concept of the proposed algorithm is to detect blend faces first, and then search for holes in accordance with the loop data in the B-rep model. The procedures for the recognition of blend faces and holes are described. Several examples are also presented to demonstrate the feasibility of the proposed algorithm.

Parameter Identification of Complex Structures Using Finite Element Model Updating Techniques

2015 ◽  
Author(s):  
Dimitrios Giagopoulos ◽  
Alexandros Arailopoulos
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Complex Geometry ◽  
Element Model ◽  
Mode Shapes ◽  
Cad Model ◽  
Modal Characteristics ◽  
Acceleration Time Histories ◽  
The Finite Element Model

In this work, an integrated reverse engineering strategy is presented that takes into account the complete process, from the developing of CAD model and the experimental modal analysis procedures to computational effective model updating techniques. Modal identification and structural model updating methods are applied, leading to develop high fidelity finite element model of geometrically complex and lightweight bicycle frame, using acceleration measurements. First, exploiting a 3D Laser Scanner, the digital shape of the real bike frame was developed and the final parametric CAD model was created. Next the finite element model of the frame was created by using quadrilateral shell and hexahedral solid elements. Due to complex geometry of the structure, the developed model consists of about one million degrees of freedom. The identification of modal characteristics of the frame is based on acceleration time histories, which are obtained through an experimental investigation of its dynamic response in a support-free state by imposing impulsive loading. A high modal density modal model is obtained. The modal characteristics are then used to update the finite element model. Single and multiobjective structural identification methods with appropriate substructuring methods, are used for estimating the parameters (material properties and shell thickness properties) of the finite element model, based on minimizing the deviations between the experimental and analytical modal characteristics (modal frequencies and mode shapes). Direct comparison of the numerical and experimental data verified the reliability and accuracy of the methodology applied.

scholarly journals Finite Element Computational Dynamics of Rotating Systems

1999 ◽  
Vol 6 (4) ◽  
pp. 209-222 ◽  
Author(s):  
Jaroslav Mackerle
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rotor Dynamics ◽  
Industrial Applications ◽  
Rotating Machinery ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Computational Dynamics ◽  
Rotating Systems ◽  
Dynamics Problems

This bibliography lists references to papers, conference proceedings and theses/dissertations dealing with finite element analysis of rotor dynamics problems that were published in 1994–1998. It contains 319 citations. Also included, as separate subsections, are finite element analyses of rotor elements – discs, shafts, spindles, and blades. Topics dealing with fracture mechanics, contact and stability problems of rotating machinery are also considered in specific sections. The last part of the bibliography presents papers dealing with specific industrial applications.

Study on Large Scale Analysis for Infra-Structure

2006 ◽  
Vol 110 ◽  
pp. 169-176
Author(s):  
Young Jae Park ◽  
Yoon Suk Chang ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Mesh Generation ◽  
Large Scale ◽  
Evaluation Method ◽  
Complex Geometry ◽  
Domain Decomposition Method ◽  
Industrial Applications ◽  
Evaluation Procedure ◽  
Scale Analysis ◽  
Virtual Plant ◽  
Large Scale Analysis

During the last two decades, the interests of large scale seamless analysis have been increased with respect to lifetime extension and management of infra-structure. And then, a seamless analysis of complex geometry is one of greatly interesting topic. However, there are still gaps between the industrial applications and fundamental academic studies owing to time consuming the modeling and analyzing process. To resolve these problems, the integrity evaluation procedure from knowledge-based information system (KIS) to ADVENTRUE has been proposed for the application of auto mesh generation and large scale analysis. The virtual plant which is used for the master of KIS, provides the 3D information of entities for mesh generation. And then, the ADVENTURE makes a domain decomposed mesh and analyzes it using hierarchical domain decomposition method. Considering the good applicability in both efficiency and exactness point of views, it is anticipated that the proposed study on large scale analysis can be used as a promising integrity evaluation method of infra-structures.

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