A Fuzzy Logic Knowledge-Based Approach for Finite Element Mesh Generation and Analysis

This work aims to enhance and validate a systematic approach for the structural finite element (FE) analysis of thermoplastic impregnated 3D filament winding structures (fiber skeletons). The idealized modeling of geometrically complex fiber skeletons used in previous publications is refined by considering additional characteristic dimensions and investigating their mechanical influence. Moreover, the modeling approach is transferred from the meso- to the macro-level in order to reduce modeling and computational effort. The properties of meso- and macro-level FE models are compared using the example of simple loop specimens. Based on the results, respective application fields are defined. In the next step, the same modeling approach is applied to a more complex, three-dimensional specimen—the inclined loop. For its macro-level FE model, additional material characterization and modeling, as well as enhancements in the modeling of the geometry, are proposed. Together with previously determined effective composite properties of fiber skeletons, these results are validated in experimental tensile tests on inclined loop specimens.

It is important to establish an integrated CAD system for mechanical engineering. The geometric model is constructed with primitives, such as wire frame, surface and solid on this system. The finite element model is induced from the substructure, which is a component of the geometric model. After the extraction of the substructure from the model, the mesh for the finite element analyses is automatically generated against the substructure. An approach to automatic mesh generation is discussed on this paper, based upon the techniques of interpolation with the blending function, originally developed for geometric modeling. But, the blending function may produce unexpected results when the mesh is generated, due to the nature of the algorithm. In order to conclude with expected results for automatic mesh generation, and accuracy-fitting method is introduced.

Quality guaranteed all-hex mesh generation by a constrained volume iterative fitting algorithm

Winding number based automatic mesh generation algorithm for hydrogen analysis code GASFLOW-MPI

A self-adaptive mesh scheme for the Finite Element (FEM) analysis of microwave transmission-lines, is presented. It provides an accurate and efficient FEM program, with automatic mesh generation, well adapted to field distribution and singularities. The method is based on the analysis of the error of the FEM application to a given discretization mesh of the structure under study, that indicates if the grid must be refined and which elements must be subdivided. An efficient procedure for the elements subdivision has been selected comparing results of two different ones.

Quadrilateral Mesh Generation with Deferred Constraint Insertion

Microstructure and compression properties of 3D powder printed Ti-6Al-4V scaffolds with designed porosity: Experimental and computational analysis

<div class="section abstract"><div class="htmlview paragraph">Prediction of in-cylinder flows and fuel-air mixing are two fundamental pre-requisites for a successful simulation of direct-injection engines. Over the years, many efforts were carried out in order to improve available turbulence and spray models. However, enhancements in physical modeling can be drastically affected by how the mesh is structured. Grid quality can negatively influence the prediction of organized charge motion structures, turbulence generation and interaction between in-cylinder flows and injected sprays. This is even more relevant for modern direct injection engines, where multiple injections and control of charge motions are employed in a large portion of the operating map. Currently, two different approaches for mesh generation exist: manual and automatic. The first makes generally possible to generate high-quality meshes but, at the same time, it is very time consuming and not completely free from user errors. Automatic mesh generation is very fast, but does not easily allow to align grid with flow and spray in regions of interest, for instance where fuel is injected or where the air flow is confined between pipe walls and thigh gaps (intake and exhaust head ducts and valve gaps). Within this context, the authors have developed a novel approach for automatic mesh generation, where both mesh quality and flow alignment are taken into account. Such methodology has been incorporated into the Lib-ICE code, which is based on the OpenFOAM technology. On the basis of combustion chamber details and/or user specified parameters (piston bowl points, injector direction, squish height, valve lift diagram,…), body fitted, high quality grids are automatically generated to perform full-cycle or compression/combustion simulations. To assess the proposed approach, two direct-injection engines were simulated. The first is Diesel fueled and only compression and combustion phases are simulated, showing the advantages of a spray-oriented grid, compared to a conventional Cartesian one, in terms of prediction of fuel-air mixing and combustion process. The second one is a gasoline, direct-injection engine. In this case full-cycle simulations were performed and computed flow field data were compared with optical experimental ones.</div></div>

Comparative finite element and experimental analysis of a quasi-static inflation of a thin deployable membrane space structure

Application of automated cubic-order mesh generation for efficient energy transfer using parabolic arcs for microwave problems

The Finite Element (FE) Analysis is an essential tool to study the biomechanical behaviour of the spine, and particularly of the intervertebral disc (IVD). The 3D reconstruction of a patient-oriented IVD has numerous obstacles. Difficulties arise mainly due to the complexity and dimensions of the IVD's constituent structures. The lack of detailed data in conventional imaging techniques causes further problems in the IVD finite element mesh generation and analysis. The accuracy of the FE computation increases if the geometry of model resembles, for instance, the natural smoothness of real anatomical structure. Accounting to this, the main idea of this work is to evaluate the impact of the reconstruction parameters by comparing the final 3D geometrical reconstruction by finite elements with an initial well-defined geometry of a given anatomical structure, and to develop the procedures for the 3D mesh generation from 2D medical imaging.

Suspension system is the most important part in any vehicle. It directly affects the human safety as well as performance. The lower control arm is a wishbone-shaped metal strut that attaches to the wheel assembly. Structural optimization techniques under static load conditions have been widely used in automobile industry for lightweight vehicle to increase its performance level. This study deals with finite element analysis of the lower control arm of MacPherson suspension system and its re-design under static loadings. The existing design of lower control arm from one of the light commercial vehicle is selected for the study. The finite element analysis is carried out to determine the deformation and stress distribution in the existing design. The main aim of this project is to redesign the lower control arm of MacPherson suspension system under the current boundary conditions and increase the safety factor from 1.3 to 2. The baseline model of the lower control arm is created by using solid modeling software, viz. CATIA. The present study is used to reduce the weight as well as cost of the lower control arm under permissible limits. Keywords: Lower control arm, CATIA, ANSYS Cite this Article Vasiuddin Ansari, Ankit Chaudhary, AtharAli Sayyed et al. Design and Analysis of a Lower Control Arm in Car by Finite Element Analysis Approach. Journal of Instrumentation Technology & Innovations. 2018; 8(2): 17–24p.

Automated Mesh Generation Using Curved Cubic Triangular Elements for a Circular Domain with a Finite Element Implementation

Objective To explore the establishment of 3D thoracic model by finite element methods, and study the mechanical mechanism of minimally invasive surgery for correcting the chest wall deformity, and provide personalized surgery solution in the future. Methods According to admission and exclusion criteria, we selected 10 cases of pectus carinatum that received chest CT scan. The finite element model of pectus carinatum was established and analyzed by Mimics, ABAQUS, etc. The validity of finite element method for chest wall was verified by comparing the sternal displacement between the simulated values and actual values with the same force. Results The 3D finite element model of pectus carinatum was successfully established and analyzed. The stress distribution of the 10 cases in the posterior ribs was mainly in the 1-6 ribs on both sides, mostly concentrated in the 4th to 6th ribs, and the stress was symmetrical on both sides. Statistical analysis showed that the displacement value of the sternum was correlated, and the validity of the model was verified. Conclusion Mimics, ABAQUS and other finite element modeling and analysis software can effectively establish the thoracic 3D finite element model and mechanical analysis, which can help the further development of personalized minimally invasive surgery for correcting chest wall deformities. Key words: Pectus carinatum; Chest wall deformity; Finite element analysis

A finite element based method for estimating natural frequencies of locally damaged homogeneous beams