Solid Modelling Research Papers - Academia.edu (original) (raw)

This poster shows the steps of how to reverse engineer and objet using laser scanner till a solid model is generated

Purpose. This paper presents the process of developing ergonomic students`desks through an integrated product team approach. Methodology. The design process used integrated product team approach. Numerous quality tools, customization techniques and strategic tools/techniques including: QFD, Ergonomics Principles, Kano Model, SCAMPER, Brainstorming, Pareto Principle, Cause-and-Effect Diagram and House of Quality were successfully applied. Also, Anthropometric measurements were used in making detailed designs. Findings. Various health problems from students who were using unergonomic furniture were well-identified. Finally, two improved designs were developed with the help of Solid Work-2016 software. Desk (Alternative-A) considered "Design for adjustability principle" which can accommodates 90% of all students (5th Female to 95th Male) percentile while Desk (Alternative-B) considered 50th percentile ("Design for average principle"). Conclusion. The two desks`designs were prepared with the help of actual data from three colleges. Verification, validation and evaluation process for desk`s designs and data were successfully done. This makes the designs to have practical validity. Therefore, implementation of these results will assist in reduction of Musculoskeletal Disorders problems, neck problems, back pain and pressure on hips. Ultimately, it's expected that the comfortability and satisfaction level to students will increase.

- by Niravkumar Bulsara
- •
- Ergonomics, Product Design, Solid Modelling

Bu çalışmada, Wankel motorunun tasarımına ilişkin unsurlar incelenmiş, rotor
köşelerinin kinematik analizi yapılmış, efektif güç ve devir sayısına bağlı olarak
dönel motorun ana boyutları ve motor geometrisine ilişkin değerler MATLAB
yazılım dili kullanılarak hesaplanmıştır. Bulunan matris biçimindeki değerler metin
düzenleyicide düzenlenerek AUTOCAD programında Wankel dönel motorunun katı
modeli çizilmiştir. Ana boyutları hesaplanan motorun termodinamik analizi karma
çevrime göre yapılmıştır.
Wankel dönel motorunun tasarımına ilişkin unsurlar , hazne ve rotor geometrisine
ilişkin trokoidal eğriler, trokoid sabiti, yelpaze(salınım) açısı, eksantriklik, rotor
yarıçapı, teorik ve gerçek sıkıştırma oranları, süpürme hacmi gibi motor boyutları ve
şekline etki eden değişkenlerdir.

- by Bahadır Akçora
- •
- Integrated CAD/CAM systems, Internal Combustion Engines, Matlab, Solid Modelling
- by Anna Batebi
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- Mechanical Engineering, Computer Aided Design, Product Design, Reverse Engineering

In this paper, we further elaborate on a methodology dedicated to the modeling of geotechnical data to be used as input in numerical simulation and TBM performance codes. The expression “geotechnical data” refers collectively to the spatial variability and uncertainty exhibited by the boundaries and the mechanical or other parameters of each geological formation filling a prescribed 3D domain. Apart from commercial design and visualization software such as AutoCAD Land Desktop® software and 3D solid modelling and meshing pre-processors, the new tools that are employed in this methodology include relational databases of soil and rock test data, Kriging estimation and simulation methods, and a fast algorithm for forward or backward analysis of TBM logged data. The latter refers to the continuous upgrade of the soil or rock mass geotechnical model during underground construction based on feedback from excavation machines for a continuous reduction of the uncertainty of predictions in unsampled areas. The approach presented here is non-intrusive since it may be used in conjunction with a commercial or any other available numerical tunneling simulation code. The application of these tools is demonstrated in Mas-Blau section of L9 tunnel in Barcelona.

- by George Exadaktylos and +1
- •
- Civil Engineering, Relational Database, Numerical Simulation, Performance Model
- by Essam Shehab
- •
- Engineering, Object Oriented Programming, Fuzzy Logic, Concurrent Engineering
- by Chris Reade
- •
- Solid Modelling, Cellular Structure, Kernel Function

Until nowadays, surface roughness effects were ignored in the analysis, due to the difficulty to generate a rough surface model and also to simplify the model in order to reduce calculation time. However, many engineering fields, such as MEMS, seek to improve the behaviour of the system at the surface level or the interface between surfaces. Thus, with the advance of numerical capabilities, the topography of the surface can be included in finite element simulations. This paper presents two methods for generating rough surfaces, one using the real shape with an original reverse engineering method and the other one by using a parametric design language to generate a normally distributed rough surface. As an application to demonstrate the power of these methods, we choose to predict by simulation the electrical contact resistance and the real contact area between rough surfaces as a function of the contact force. This application is a major concern in RF MEMS ohmic Switches and shows a...

- by David Peyrou
- •
- Finite Element, Reverse Engineering, Surface Roughness, RF MEMS

In this paper the sliding velocities of plastic non-conventional spur gears is analysed. There are two peculiarities to be taken into account when metal gear practice is applied: the variable tooth height along the gear face width and the special meshing conditions of plastic gears. The study is based on the curved face width spur gear solid modelling which enable gear tooth geometry to be produced. A primary analysis shows the effect of the suggested spur gear design on the sliding velocity. Different curvatures and heights of the non-standard gear teeth show the influence of the tooth geometry on sliding velocity variation, a particular criteria for a further study on the optimisation of the gear geometry.

- by Gabriel Andrei
- •
- Solid Modelling
- by Nand Jha
- •
- Applied Mathematics, Finite Element, Finite Element Analysis, Design process
- by Keith Case
- •
- Materials Engineering, Mechanical Engineering, Genetics, Genetic Algorithms

ABSTRACT This paper reports experimental observations on changes in process rheology caused by successive processing of chocolate and cocoa butter in a semi-solid state. Experiments were carried out using a multi-pass rheometer where successive extrusion passes were used with different time delays between each pass. The results show that both chocolate and cocoa butter are sensitive to process history. Additional microstructural data was obtained by using an in situ X-ray facility coupled to the multi-pass rheometer and results obtained using this technique indicate that the process rheology changes are coupled with matching changes in the amount of crystal phase present.

- by Helaman Pratt Ferguson
- •
- Mathematics, Computer Science, Computer Graphics, Computer Aided Design

The paper deals with the development of a parallel robotic arm for deep-sea maintenance operations on oil and gas exploitation scaffoldings and piping, at 2000÷3000 m under sea-level. Resort to the innovative architecture looks to be a useful improvement as compared with traditional approaches, due to inherent capabilities in terms of stiffness, accuracy and effectiveness, which grant higher mission success

- by R. M Molfino
- •
- Oil and gas, Sea Level, Conceptual Design, Parallel Robot

This chapter describes and critically reviews all the phases of an enquiry supported by the Museo Nacional del Prado in Madrid on an almost unknown project of a monument for Felipe IV of Spain in the portico of the Basilica of S. Maria Maggiore in Rome designed by Gian Lorenzo Bernini. The process consists of analysis and re-drawing after the existing documents, of modeling of the solid-perspective sacellum and the bronze statue actually made by Girolamo Lucenti, and of presentation and dissemination of the results, in form of video in the exhibition in Madrid and in other visual product to illustrate scientific publications. This process has been didactically divided between digital heritage, the translation of tangible historical-testimonial documents into digital formats, and virtual heritage, the production of original digital contents aimed at visually recreating the unbuilt monument and its perspective deceptive effects.

- by cesar barraza
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- Cognitive Science, Computer Graphics, Computational Geometry, Algorithmic Algebra
- by Nicolas Jacques and +1
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- Engineering, Numerical Method, Numerical Simulation, Boundary Element Method

... All rights reserved Printed in Great Britain 09541810 97 S17.00 An agentbased paradigm for building intelligent CAD systems J. Bento Department of Civil Engineering, Instituto Superior Tecnico, 1096 Lisboa Codex, Portugal B. Feijo... more

- by rezia molfino
- •
- Oil and gas, Sea Level, Conceptual Design, Parallel Robot

A mathematical model for free-form solid modelling was presented in previous published works. The key aspects of this model are the decomposition of the volume occupied by the solid into non-disjoint cells, and the representation of the solid as an algebraic sum of these cells. Here we apply this scheme to represent CSG solids built by combining free-form solids in boolean operations. As a proof of the validity of this scheme, we present an algorithm that allows us to visualize the nonevaluated result of the operations. We have worked with free-form solids whose surfaces are bounded by a set of low degree triangular parametric patches.

- by Francisco Feito
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- Mathematical Model, Solid Modelling
- by Luiz Fernando
- •
- Mechanical Engineering, Computer Graphics, Computer Aided Design, Abstraction

- by Francisco Feito
- •
- Mathematical Model, Solid Modelling
- by Lasse Holmström
- •
- Mechanical Engineering, Computer Aided Design, Solid Modelling
- by Mohan Trivedi
- •
- Civil Engineering, Movement analysis, Road safety, Situation awareness

A series of creative text physicalizations are accounted for herein, with reference to research literature and, most importantly , to an experimental algorithmic system designed and implemented by the author. The latter concerns a series of experimental pipelines that 'understand' the input text generating keywords, that utilize them to query 3D data from WWW, and, finally, that transfigure and merge the latter so that new original artefacts are synthesized. The various physical, digital, and post-digital material affordancies of the resulting physicaliza-tions are scrutinized in some depth and in an analytic fashion. Objects of sorts are shown to be ascribed a certain kind of emergent neo-materiality, in that they are themselves hybrid manifestations of interwoven physical and digital affairs. As such, they constitute situated inquiries of the very same (technological) paradigms that brought them forth, as well as of their cultural and ideological offshoots. Physicalizations of sorts are shown to be 'Herzian', post-optimal, and disruptive, being both the creative means towards an exploration of new kinds of materiality/objecthood, and an implicit critique of the canonical functional design schemata that largely pertain digital fabrication nowadays.

- by Fabio Colonnese
- •
- 3D Reconstruction, Baroque art and architecture, Gianlorenzo Bernini, Perspective
- by Pietro Picuno
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- Engineering, Image Processing, Remote Sensing, Visual perception
- by Ian Grimstead
- •
- Three Dimensional, Solid Modelling, Two Dimensions, Solid Modeling
- by Lior Horesh
- •
- Algorithms, Biomedical Engineering, Magnetic Resonance Imaging, Epilepsy

- by David Peyrou
- •
- Materials Science, Finite Element, Reverse Engineering, Surface Roughness

This study proposes the use of a multi-criteria decision-making approach by design educators and practitioners to optimally select a solid modelling software for varying objectives. In order to propose the methodology a literature review to compile the criteria used for selecting solid modellers, a preliminary comparison of solid modellers on established criteria, an experiment to compare the user performance on predetermined solid modelling functions, the formulation of the software selection problem as a multi-criteria decision-making problem, and a review of multi-criteria decision-making tools were completed. The methodology proposed employs the Analytic Hierarchy Process. This paper documents the entire methodology. The set of outcomes of the study is expected to aid companies and design educators in making solid modeller selection decisions.

This paper deals with modelling point sets with attributes. A point set in a geometric space of an arbitrary dimension is a geometric model of a real object or process under consideration. An attribute is a mathematical model of a real object or process property of an arbitrary nature (material, photometric, physical, statistical, etc.) defined for any point of the point set. We provide a survey of different modelling techniques related to point sets with attributes. This survey spans such different areas as solid modelling, heterogeneous objects modelling, scalar fields or " implicit surface " modelling, and volume graphics. Then, on the basis of this survey we formulate requirements to a general model of hypervolumes (multidimensional point sets with multiple attributes). A general hypervolume model and its components such as objects, operations, and relations are introduced and discussed. A function representation (FRep) is used as the basic model for the point set geometry and attributes represented independently using real-valued scalar functions of several variables. Each function defining the geometry or an attribute is evaluated at the given point by a procedure traversing a constructive tree structure with primitives in the leaves and operations in the nodes of the tree. This reflects the constructive nature of the symmetric approach to modelling geometry and associated attributes in multidimensional space. To demonstrate a particular application of the proposed general model, we consider in detail the problem of texturing, introduce a model of constructive hypervolume texture, and discuss its implementation. The well-known concept of solid texturing is extended in two directions: constructive modelling of space partitions for texturing and modelling of multidimensional textured objects. We implemented a special modelling language and software tools supporting the proposed general model. Several examples of modelling and rendering 3D, 4D (time-dependent), and multidimensional objects with constructive hypervolume textures are provided.

- by Benjamin Schmitt
- •
- Implicit surfaces, Hyperfun, Solid Modelling, Attributes

An adaptive algorithm to compute the medial axis transform of 2Dpolygonal domains with arbitrary genus is presented. The algorithmis based in the refinement of a coarse medial axis transform by subdividingthe domain adaptively. The algorithm provides the medial axisrepresented by a set of triangles of a predefined size and the closestboundary element. Examples of results are also presented to illustratethe method.Keywords: CAD, CAGD, CAM, geometric modelling, solid modelling,medial...

- by Lluis Perez
- •
- Mathematics, Computer Science, Geometric Modelling, Medial Axis Transform
- by Mohan Trivedi
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- Civil Engineering, Movement analysis, Road safety, Situation awareness
- by Juan Carlos Torres and +1
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- Solid Modelling, Progressive data transmission
- by Alexander Pasko
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- Visualization, Motion Planning, Finite Elements, Data Visualisation

Abstract. This paper proposes a reactive agent architecture for the integration of solid modelling processes into more general design processes. The basic idea is to focus on reactivity rather than on symbolic representations of design... more

- by Bruno Bento
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- Artificial Intelligence, Concurrent Engineering, Rio de Janeiro, Solid Modelling
- by Andrea Santomaso
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- Engineering, Multiphase Flow, Rheology, Granular Flow
- by Manjula Patel
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- Computer Graphics, Rendering (Computer Graphics), Solid Modelling