Comparative FEM Analysis of Gears Modeled With Analytical, Solid Subtracting and Mixed CAD Generating Method

MACRo 2015 ◽  
2017 ◽  
Vol 2 (1) ◽  
pp. 121-128
Author(s):  
Ferenc Tolvaly-Rosca ◽  
András Kakucs ◽  
Zoltán Forgó ◽  
Márton Máté
Keyword(s):  
Analytical Method ◽  
Fem Analysis ◽  
Solid Model ◽  
The Novel ◽  
Filtering Algorithm ◽  
Modeling Process ◽  
Generating Method ◽  
Solid Models ◽  
Mathematical Equations ◽  
Fea Analysis

AbstractThe paper proposes a comparative FEM analysis of gears solid model bodies, obtained with three different methods. The analytical method is based on the mathematical equations of the tooth flanks. It supposed to be the most accurate and precise solid modeling process. However, it reveals it’s limits by handling of surfaces that are not deduced mathematically, or in case of tooth geometries which needs to be modified in order to perform a quick test regarding the probably effects of the mentioned modifications. The solid subtraction- and the newly developed, mixed CAD method are pure CAD generating methods. As any discrete generating method, their precision is influenced by the fineness of the iteration steps. In case of the mixed CAD solution the precision is influenced by the filtering algorithm applied to the generated Points Cloud. The visual comparison of the three mentioned methods, was presented in previously published papers. The present paper validates the novel mixed CAD method comparing the FEA analysis of the generated solid models.

Internet Based Framework to Perform Automated FEA on User Customized Products

2003 ◽  
Author(s):  
Zahed Siddique ◽  
Jiju A. Ninan
Keyword(s):  
Product Family ◽  
Solid Model ◽  
Product Families ◽  
Analysis And Evaluation ◽  
The Past ◽  
Evaluation Of Performance ◽  
Internet Users ◽  
Solid Models ◽  
3D Solid ◽  
Fea Analysis

Designing family of products require analysis and evaluation of performance for the entire product family. In the past, products were mainly mass-produced hence the use of CAD/CAE was restricted to developing and analyzing individual products. Since the products offered using a platform approach include a variety of products built upon a common platform, CAD/CAE tools need to be explored further to assist in customization of products according to the customer needs. In this paper we investigate the development of a Product Family FEA (PFFEA) module that can support FEA analysis of user customized product families members. Customer specifications for family members are gathered using the internet, users are allowed to scale and change configurations of products. These specifications are then used to automatically generate 3D solid models of the product and then perform FEA to determine feasibility of the customer specified product. In this paper, development of the PFFEA module is illustrated using a family of lawn trimmer and edger. The PFFEA module uses Pro/E to generate the solid model and ANSYS as the base FEA software.

scholarly journals CAD Solution to Determine Points from Chipping Tool Solid Model Cutting Edges

2020 ◽  
Vol 12 (1) ◽  
pp. 67-70
Author(s):  
Ferenc Tolvaly-Roşca ◽  
Márton Máté ◽  
Zoltán Forgó ◽  
Judit Pásztor
Keyword(s):  
Cutting Tools ◽  
Design Principles ◽  
Solid Model ◽  
Gear Teeth ◽  
Generating Method ◽  
Mathematical Equations ◽  
Special Points

AbstractThe Mixed CAD Generating Method, developed by the first author and presented in previous papers, is able to generate gear teeth gaps from a special points cloud. The generation method requires only a few specific points from the cutting edges of the generating tools. These points can be obtained in a first approach through a simple drawing of the cutting edges. The drawings can use either mathematical equations, or simply the construction and design principles of the cutting tools. In the case of multi-edge cutting tools of a higher level of complexity, or in case of the absence of the edge equations, there exists a simpler approach. It consists in building a solid model, or obtaining the solid model of the tools from the tool’s designer or manufacturer. In these cases, the generating points are downloaded from the solid model. This paper presents two possibilities of obtaining these points with usual CAD methods.

scholarly journals Comparison of Computer Extended Descriptive Geometry (CeDG) with CAD in the Modeling of Sheet Metal Patterns

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 685
Author(s):  
Manuel Prado-Velasco ◽  
Rafael Ortiz-Marín
Keyword(s):  
Sheet Metal ◽  
Computer Aided Design ◽  
Parametric Modeling ◽  
Descriptive Geometry ◽  
The Novel ◽  
Forming Process ◽  
Solid Models ◽  
Design Software ◽  
Solid Edge ◽  
Aided Design

The emergence of computer-aided design (CAD) has propelled the evolution of the sheet metal engineering field. Sheet metal design software tools include parameters associated to the part’s forming process during the pattern drawing calculation. Current methods avoid the calculation of a first pattern drawing of the flattened part’s neutral surface, independent of the forming process, leading to several methodological limitations. The study evaluates the reliability of the Computer Extended Descriptive Geometry (CeDG) approach to surpass those limitations. Three study cases that cover a significative range of sheet metal systems are defined and the associated solid models and patterns’ drawings are computed through Geogebra-based CeDG and two selected CAD tools (Solid Edge 2020, LogiTRACE v14), with the aim of comparing their reliability and accuracy. Our results pointed to several methodological lacks in LogiTRACE and Solid Edge that prevented to solve properly several study cases. In opposition, the novel CeDG approach for the computer parametric modeling of 3D geometric systems overcame those limitations so that all models could be built and flattened with accuracy and without methodological limitations. As additional conclusion, the success of CeDG suggests the necessity to recover the relevance of descriptive geometry as a key core in graphic engineering.

Interference-Free Multi-Axis NC Machining of Cylindrical Cam Using Enveloping Element

2009 ◽  
Vol 419-420 ◽  
pp. 333-336
Author(s):  
Jeng Nan Lee ◽  
Chih Wen Luo ◽  
Hung Shyong Chen
Keyword(s):  
Cutting Tool ◽  
Nc Machining ◽  
Model Material ◽  
Solid Model ◽  
End Mill ◽  
Generating Method ◽  
Collision Problem ◽  
Five Axis ◽  
Cutting Path ◽  
Cutting Simulations

To obtain the flexibility of choice of cutting tool and to compensate the wear of the cutting tool, this paper presents an interference-free toolpath generating method for multi-axis machining of a cylindrical cam. The notion of the proposed method is that the cutting tool is confined within the meshing element and the motion of the cutting tool follows the meshing element so that collision problem can be avoided. Based on the envelope theory, homogeneous coordinate transformation and differential geometry, the cutter location for multi-axis NC machining using cylindrical-end mill is derived and the cutting path sequences with the minimum lead in and lead out are planned. The cutting simulations with solid model are performed to verify the proposed toolpath generation method. It is also verified through the trial cut with model material on a five-axis machine tool.

Geometric Assistance for the Construction of Non-Polyhedral Solids From Orthographic Views

1997 ◽  
Author(s):  
Carol Hubbard ◽  
Yong Se Kim
Keyword(s):  
Computer Graphics ◽  
Solid Model ◽  
Geometric Framework ◽  
Mechanical Parts ◽  
Interactive Computer Graphics ◽  
Mechanical Part ◽  
Solid Models ◽  
Spherical Surfaces ◽  
Rapid Construction ◽  
Engineering Drawings

Abstract As the extensive use of solid models becomes widespread, it is important to have a mechanism by which existing engineering drawings can be converted into solid models. Therefore, a geometric assistant which can aid in the construction of solid models is beneficial. In this paper, we present key operations for a system called the Assistant for the Rapid Construction of Solids (ARCS), that provides this assistance given a set of two orthographic views. ARCS is based on the Visual Reasoning Tutor (VRT), a system we developed that provides users with the geometric framework to build polyhedral solids from their orthographic views. However, the geometric domain of ARCS encompasses non-polyhedral solids with cylindrical and spherical surfaces, such as those found in typical mechanical parts. We have devised the Cylindrical and Spherical Warping operations to create cylindrical and spherical surfaces, which use interactive computer graphics that guide a human user to build non-polyhedral faces of a solid. These operations are then illustrated with an example using ARCS to create the solid model of a typical mechanical part from its orthographic projections.

scholarly journals Mathematical and geometrical modeling of braided ropes bent over a sheave

2020 ◽  
Vol 15 ◽  
pp. 155892502093972
Author(s):  
Guifang He ◽  
Chunfu Sheng ◽  
Hongwei He ◽  
Rong Zhou ◽  
Ding Yuan ◽  
...  
Keyword(s):  
Mathematical Method ◽  
Phase Difference ◽  
Computational Simulation ◽  
The Other ◽  
Force Transmission ◽  
Helical Surface ◽  
Modeling Process ◽  
Mathematical Equations ◽  
The Difference ◽  
Final Equation

As soft elements for force transmission, braided fiber ropes play important roles in many fields where the fiber ropes are used bent over sheaves, while the relevant experiments are time-consuming and expensive. Computational simulation is a promising choice for evaluating the performance of fiber ropes when bent over a sheave. This article presents two methods that could be employed to build a model of braided rope bent over a sheave. One is the mathematical method which deduces the exact mathematical equations of braiding curves based on the Frenet–Serret frame. The spatial equations, considering the phase difference of strands in the same direction and the difference of strands’ projection in different directions, are discussed carefully. The final equation of braided strands is confirmed by modeling the braided rope in Maple® 17. The other method, which is inspired by the analysis of braiding movements, is based on the intersection of surfaces of braiding surface and helical surface which are introduced and defined based on the motion analysis of bobbins and take-up roller. The SolidWorks® 2018 is successfully employed to realize the modeling process.

Destructive Modeling by Volume Decomposition and Its Applications

2003 ◽  
Author(s):  
Yoonhwan Woo ◽  
Sang Hun Lee
Keyword(s):  
Decomposition Method ◽  
Solid Model ◽  
Solid Models ◽  
Volume Decomposition ◽  
Number Of Cells ◽  
Natural Way

Adding simple volumes, which are often called primitives, is a natural way to construct complex solid models. Conversely, cell-based volume decomposition is the existing method to decompose a complex solid model into simpler volumes that are often the primitives used to create the model. One problem of this volume decomposition is that it generates a large number of cells, many of which are unnecessary for the decomposition. In this paper, a volume decomposition method that improves the performance by avoiding generating the unnecessary cells is presented. Some possible applications are also presented to attest the usefulness of this volume decomposition method.

Modeling Research of Hypoid Gear Based on Real Machining Process

2010 ◽  
Vol 20-23 ◽  
pp. 1429-1433
Author(s):  
Xiu Ting Wei ◽  
Jing Cheng Liu ◽  
Qiang Du
Keyword(s):  
Tooth Profile ◽  
Modeling Method ◽  
Machining Process ◽  
Transmission Ratio ◽  
Hypoid Gear ◽  
Hypoid Gears ◽  
Modeling Methods ◽  
Modeling Process ◽  
Generating Method

In this paper, two modeling methods, the forming method and the generating method, for hypoid gears with two kinds of transmission ratio are discussed by simulating the actual machining process. In the generating modeling method, the tooth profile of the gear is generated by boolean algorithm step by step after creating the models of the gear blank and the cutter and then rotating around their own axis by certain degrees until the cutter is outside the gear blank completely. In contrast with the generating modeling method, the tooth profile is formed by carrying out the boolean algorithm for one time after creating the models of the gear blank and cutter seperately in the forming modeling method. Then using feature instance, all the teeth are created both in the generating modeling method and in the forming modeling method. Using the two modeling methods given in this paper, the modeling process can be shortened and the modeling precision can be improved.

Harmonic Analysis of a Five Level Cascaded Inverter Under a New Modulation Scheme

2012 ◽  
Author(s):  
J. Aziz ◽  
Z. Salam
Keyword(s):  
Harmonic Analysis ◽  
Key Words ◽  
Analytical Method ◽  
Output Voltage ◽  
Fourier Coefficients ◽  
Modulation Scheme ◽  
Test Rig ◽  
Single Carrier ◽  
Mathematical Equations

Kertas kerja ini mengusulkan satu kaedah analitikal untuk meramalkan magnitud dan kedudukan harmonik voltan keluaran penyongsang lima tahap. Penyongsang tersebut telah digunakan untuk melaksanakan satu skim pemodulatan baru yang menggunakan beberapa isyarat memodulat berserta isyarat pembawa tunggal. Seterusnya daripada skim pemodulatan tersebut, persamaan matematik yang dapat menentukan pensuisan PWM diterbitkan. Untuk memastikan kelebihan skim pemodulatan tersebut, analisis harmonik untuk mendapatkan pekali Fourier diterbitkan dan dikira menggunakan MATLAB. Harmonik voltan keluaran yang diukur dan dikira seterusnya dibandingkan dan dibincangkan. Kata kunci: Analisis harmonik; penyongsang bertahap This paper proposes an analytical method to predict the incidence and magnitude of harmonics of the output voltage of a five–level cascaded inverter. The cascaded inverter is subjected to a new modulation scheme, which uses multiple modulating signals with a single carrier. From the modulation scheme, mathematical equations that define the PWM switching instants are derived. In order to justify the merits of the proposed modulation scheme, harmonic analysis for the Fourier coefficients is outlined and calculated using MATLAB. An experimental five–level cascaded inverter test–rig is built and the new modulation scheme is implemented. The calculated and measured harmonics of the output voltage are compared and discussed. Key words: Harmonic analysis; cascaded inverter

scholarly journals Moral and Religious Values in the Novel "Negeri Lima Menara" by A. Fuadi and its Relationship as Reading Materials in Schools Year 2020/2021

2020 ◽  
Vol 2 (3) ◽  
pp. 747-764
Author(s):  
Putri Apriani ◽  
Erikson Saragih ◽  
Rosliani
Keyword(s):  
Analytical Method ◽  
Moral Values ◽  
Moral Courage ◽  
Religious Values ◽  
The Novel ◽  
Reading Material ◽  
Reading Materials ◽  
Student Reading ◽  
Qualitative Descriptive

This study aims to describe the moral values and religious values in the novel Negeri Lima Menara in the development of learning, as well as to describe the relevance of moral and religious values in Negeri Lima Menara as student reading material. The method used in this research is qualitative descriptive analytical method, which is to provide an understanding of the elements that are the center of the research so as to achieve the expected results in the Negeri Lima Menara Novel by A. Fuadi. The results showed that moral values consisted of 6 categories, namely honesty with a frequency of 13 or 21.311%, authentic values (confidence) with a frequency of 15 or 24.590%, willingness to be responsible with a frequency of 14 or 22.950%, moral independence with a frequency of 7 or 11,475%, moral courage with a frequency of 8 or 13,114% and humility with a frequency of 4 or 9,677%. Meanwhile, the religious values in the Negeri Lima Menara novel by A. Fuadi consist of 6 categories, namely submission and obedience with a frequency of 7 or 24.137%, a life full of deference with a frequency of 7 or 24.137%, inner feelings related to God with a frequency of 5 or 17,241%, feelings of sin with a frequency of 5 or 17,241%, feelings of fear with a frequency of 2 or 6,896% and acknowledging the greatness of God with a frequency of 5 or 17,241%.

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