Pocket Decomposition using DN and HARI Number. A Novel Approach PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Pocket Decomposition using DN and HARI Number. A Novel Approach PDF full book. Access full book title Pocket Decomposition using DN and HARI Number. A Novel Approach by Divyangkumar Patel. Download full books in PDF and EPUB format.
Author: Divyangkumar Patel
Publisher: GRIN Verlag
ISBN: 3668659192
Category : Technology & Engineering
Languages : en
Pages : 214
Get Book Here
Book Description
Doctoral Thesis / Dissertation from the year 2016 in the subject Engineering - Mechanical Engineering, grade: Distinction, Sardar Vallabhbhai National Institute of Technology, language: English, abstract: A 2.5D pocket milling is extensively used in aerospace, shipyard, automobile, dies and molds industries. In machining of 2.5D pockets, directional parallel tool-path and contour parallel tool-path are widely used. However, these tool paths significantly limit the machining efficiency. In the present work, an attempt has been made to generate a spiral tool path for machining of 2.5D star-shaped pocket for improving machining efficiency. The spiral tool path is developed using second order elliptic partial differential equation (PDE) and it is free from sharp corners inside the pocket region. Further, the implementation of proposed method is presented on complex non-star-shaped polygon, pocket bounded by free-form curve and pocket with island. The shape of pocket geometry, tool path strategy and various machining parameters (speed, feed rate and depth of cut) affect machining performance. However, the effect of the shape of a pocket geometry and tool path strategy on the performance of pocket machining is scarcely reported. Hence, an attempt has been made to investigate the effect of aspect ratio, feed rate and tool path strategies (zig-zag, spiral and contour parallel) on tool path length, cutting time, percentage utilization of a tool and average surface roughness in machining of AISI 304 stainless steel using design of experiments (DOE). From the findings of above experimental investigation, it was anticipated that there is a need to develop a method (or technique) for comparing different pocket geometry quantitatively and predict the effect of pocket geometry on pocket machining. A novel approach is reported for quantitative comparison of different pocket geometries using a dimensionless number, Divyang Number (DN). The concept and formula of DN are developed and DN is calculated for various pocket geometries. The guidelines for comparing pocket geometries based on DN and PUT (percentage utilization of tool) are reported. The results show that DN can be used to predict the quality of tool path prior to tool path generation. Further, an algorithm to decompose pocket geometry (parent geometry) into sub-geometries is developed that improves the efficiency of spiral tool path for bottle-neck pockets using HARI Number. The results indicate that decomposing pocket geometry with the new algorithm improves HARIN and removes the effect of bottle-necks. Furthermore, the algorithm for decomposition is extended for pockets that are bounded by free-form curves.
Author: Divyangkumar Patel
Publisher: GRIN Verlag
ISBN: 3668659192
Category : Technology & Engineering
Languages : en
Pages : 214
Get Book Here
Book Description
Doctoral Thesis / Dissertation from the year 2016 in the subject Engineering - Mechanical Engineering, grade: Distinction, Sardar Vallabhbhai National Institute of Technology, language: English, abstract: A 2.5D pocket milling is extensively used in aerospace, shipyard, automobile, dies and molds industries. In machining of 2.5D pockets, directional parallel tool-path and contour parallel tool-path are widely used. However, these tool paths significantly limit the machining efficiency. In the present work, an attempt has been made to generate a spiral tool path for machining of 2.5D star-shaped pocket for improving machining efficiency. The spiral tool path is developed using second order elliptic partial differential equation (PDE) and it is free from sharp corners inside the pocket region. Further, the implementation of proposed method is presented on complex non-star-shaped polygon, pocket bounded by free-form curve and pocket with island. The shape of pocket geometry, tool path strategy and various machining parameters (speed, feed rate and depth of cut) affect machining performance. However, the effect of the shape of a pocket geometry and tool path strategy on the performance of pocket machining is scarcely reported. Hence, an attempt has been made to investigate the effect of aspect ratio, feed rate and tool path strategies (zig-zag, spiral and contour parallel) on tool path length, cutting time, percentage utilization of a tool and average surface roughness in machining of AISI 304 stainless steel using design of experiments (DOE). From the findings of above experimental investigation, it was anticipated that there is a need to develop a method (or technique) for comparing different pocket geometry quantitatively and predict the effect of pocket geometry on pocket machining. A novel approach is reported for quantitative comparison of different pocket geometries using a dimensionless number, Divyang Number (DN). The concept and formula of DN are developed and DN is calculated for various pocket geometries. The guidelines for comparing pocket geometries based on DN and PUT (percentage utilization of tool) are reported. The results show that DN can be used to predict the quality of tool path prior to tool path generation. Further, an algorithm to decompose pocket geometry (parent geometry) into sub-geometries is developed that improves the efficiency of spiral tool path for bottle-neck pockets using HARI Number. The results indicate that decomposing pocket geometry with the new algorithm improves HARIN and removes the effect of bottle-necks. Furthermore, the algorithm for decomposition is extended for pockets that are bounded by free-form curves.
Author:
Publisher: Int. Rice Res. Inst.
ISBN: 9711041049
Category : Agricultural wastes
Languages : en
Pages : 642
Get Book Here
Book Description
Author: Bruce J Berne
Publisher: World Scientific
ISBN: 9814496057
Category : Science
Languages : en
Pages : 881
Get Book Here
Book Description
The school held at Villa Marigola, Lerici, Italy, in July 1997 was very much an educational experiment aimed not just at teaching a new generation of students the latest developments in computer simulation methods and theory, but also at bringing together researchers from the condensed matter computer simulation community, the biophysical chemistry community and the quantum dynamics community to confront the shared problem: the development of methods to treat the dynamics of quantum condensed phase systems.This volume collects the lectures delivered there. Due to the focus of the school, the contributions divide along natural lines into two broad groups: (1) the most sophisticated forms of the art of computer simulation, including biased phase space sampling schemes, methods which address the multiplicity of time scales in condensed phase problems, and static equilibrium methods for treating quantum systems; (2) the contributions on quantum dynamics, including methods for mixing quantum and classical dynamics in condensed phase simulations and methods capable of treating all degrees of freedom quantum-mechanically.
Author: Ivan Niven
Publisher:
ISBN: 9780852266304
Category : Number theory
Languages : en
Pages : 288
Get Book Here
Book Description
Author: Saikat Das Gupta
Publisher: CRC Press
ISBN: 0849373166
Category : Technology & Engineering
Languages : en
Pages : 360
Get Book Here
Book Description
Reverse engineering is widely practiced in the rubber industry. Companies routinely analyze competitors’ products to gather information about specifications or compositions. In a competitive market, introducing new products with better features and at a faster pace is critical for any manufacturer. Reverse Engineering of Rubber Products: Concepts, Tools, and Techniques explains the principles and science behind rubber formulation development by reverse engineering methods. The book describes the tools and analytical techniques used to discover which materials and processes were used to produce a particular vulcanized rubber compound from a combination of raw rubber, chemicals, and pigments. A Compendium of Chemical, Analytical, and Physical Test Methods Organized into five chapters, the book first reviews the construction of compounding ingredients and formulations, from elastomers, fillers, and protective agents to vulcanizing chemicals and processing aids. It then discusses chemical and analytical methods, including infrared spectroscopy, thermal analysis, chromatography, and microscopy. It also examines physical test methods for visco-elastic behavior, heat aging, hardness, and other features. A chapter presents important reverse engineering concepts. In addition, the book includes a wide variety of case studies of formula reconstruction, covering large products such as tires and belts as well as smaller products like seals and hoses. Get Practical Insights on Reverse Engineering from the Book’s Case Studies Combining scientific principles and practical advice, this book brings together helpful insights on reverse engineering in the rubber industry. It is an invaluable reference for scientists, engineers, and researchers who want to produce comparative benchmark information, discover formulations used throughout the industry, improve product performance, and shorten the product development cycle.
Author: Dr. H.S. Mukunda
Publisher:
ISBN: 9788126529698
Category : Biomass energy
Languages : en
Pages : 300
Get Book Here
Book Description
Special Features: · Foreword by Prof. C.N.R. Rao, National Research Professor and Linus Pauling Research Professor & Chairman, Scientific Advisory Council to the Prime Minister, Jawaharlal Centre for Advanced Scientific Research, Bangalore.· Excellent authorship.· This book is an authoritative source for understanding the subject of the clean conversion of biomass to energy and upgraded fuels - gases and liquids for heat, electricity and transportation from the vantage point of developing countries like India and other oil importing nations bestowed with bio-resource. · There is no book that addresses the progress in the science and technology of modern approaches to conversion of biomass to energy and clean fuels with developing country context in mind. The books available today are also not of a nature that approaches the subject from the view point of fundamentals particularly with reference to new technologies. · Summary and questions at the end of each chapter.· Numerous illustrations. About The Book: This book is an authoritative source for understanding the subject of the clean conversion of biomass to energy and upgraded fuels - gases and liquids for heat, electricity and transportation from the vantage point of developing countries like India and other oil importing nations bestowed with bio-resource. It aims at creating an understanding of (a) the magnitude and nature of biomass resources for energy and fuels, largely for India, (b) the variety of processes that are available for conversion of the wastes into energy or fuels, (c) the processes, both microbial (anaerobic digestion) and thermo-chemical (combustion and gasification) and a critical assessment of the performance on a technical and environmental basis addressing those approaches that make greater importance in terms of scale to developing countries like India, (d) processes that have not reached the commercial relevance yet - like Stirling engine, fuel cells, in particular direct carbon fuel cell and microbial fuel cell and could become relevant in coming times, (e) the routes for liquid bio-fuels - first generation fuels like ethanol and plant oils as well as second generation fuels such as cellulosic ethanol and gasification -Fischer-Tropsch synthesis based biodiesel.
Author: Donald L. Klass
Publisher: Elsevier
ISBN: 0080528058
Category : Technology & Engineering
Languages : en
Pages : 669
Get Book Here
Book Description
Biomass for Renewable Energy, Fuels, and Chemicals serves as a comprehensive introduction to the subject for the student and educator, and is useful for researchers who are interested in the technical details of biomass energy production. The coverage and discussion are multidisciplinary, reflecting the many scientific and engineering disciplines involved. The book will appeal to a broad range of energy professionals and specialists, farmers and foresters who are searching for methods of selecting, growing, and converting energy crops, entrepreneurs who are commercializing biomass energy projects, and those involved in designing solid and liquid waste disposal-energy recovery systems. Presents a graduated treatment from basic principles to the details of specific technologies Includes a critical analysis of many biomass energy research and commercialization activities Proposes several new technical approaches to improve efficiencies, net energy production, and economics Reviews failed projects, as well as successes, and methods for overcoming barriers to commercialization Written by a leader in the field with 40 years of educational, research, and commercialization experience
Author: Olaf Sporns
Publisher: MIT Press
ISBN: 0262528983
Category : Medical
Languages : en
Pages : 433
Get Book Here
Book Description
An integrative overview of network approaches to neuroscience explores the origins of brain complexity and the link between brain structure and function. Over the last decade, the study of complex networks has expanded across diverse scientific fields. Increasingly, science is concerned with the structure, behavior, and evolution of complex systems ranging from cells to ecosystems. In Networks of the Brain, Olaf Sporns describes how the integrative nature of brain function can be illuminated from a complex network perspective. Highlighting the many emerging points of contact between neuroscience and network science, the book serves to introduce network theory to neuroscientists and neuroscience to those working on theoretical network models. Sporns emphasizes how networks connect levels of organization in the brain and how they link structure to function, offering an informal and nonmathematical treatment of the subject. Networks of the Brain provides a synthesis of the sciences of complex networks and the brain that will be an essential foundation for future research.
Author: Steven G. Kellman
Publisher: Columbia University Press
ISBN: 9780231047821
Category : Education
Languages : en
Pages : 188
Get Book Here
Book Description
Author: David A.D. Parry
Publisher: Springer
ISBN: 3319496743
Category : Science
Languages : en
Pages : 630
Get Book Here
Book Description
This book provides the readers with an up-to-date review of the design, structure and function of a representative selection of fibrous proteins in both health and disease. The importance of the α-helical coiled coil, a conformational motif based on the heptad repeat in the amino acid sequence of all α-fibrous proteins (and parts of some globular proteins) is underlined by three Chapters devoted to its design, structure, function and topology. Specific proteins covered in the text and which depend on the coiled coil for their structure and function, include the intermediate filament proteins, tropomyosin, myosin, paramyosin, fibrin and members of the spectrin superfamily. Also described are fibrous proteins based on the β-pleated sheet and collagen conformations. Recombinant structural proteins, especially of silk and collagen, are discussed in the context of developing new biomaterials with varied applications. Established researchers and postgraduate students in the fields of protein chemistry, biochemistry and structural biophysics will find Fibrous Proteins: Structures and Mechanisms to be an invaluable collection of topical reviews that describe the basic advances made in the field of fibrous proteins over the past decade. This book, written by recognized authorities in the field, provides a clear account of the current status of fibrous protein research and, in addition, establishes the basis for deciding the most appropriate directions for future activity, including the applications of protein engineering and the commercial exploitation of new biomaterials.
