Design Rule Checker for Sheet MetalComponents using Medial Axis Transforms andGeometric
Design Rule Checker is an essential component of design automation and for making design, process planning and manufacturing concurrent. In this paper, a set of algorithms are presented for detecting design violations in sheet metal components. Violations in sheet metal components occur when holes, slots, or other features are too close to one another. These violations, if undetected during design, increase the design life cycle of the product. Thus it is very essential to detect, if not eliminate these violations at the early stages of design. Typically sheet metal components have a number of features serving various purposes which include ventilation and fastening. As the contour of the parts gets complicated and the number of features on the sheet metal part increases it is diicult to check the rules exhaustively as it may lead to combinatorial explosion. 1 The algorithm presented here, uses Medial axis transformation to decompose a given domain thus preventing a combinatorial explosion, and also provides a means to integrate the rule checker with a design adviser.
Feature reasoning for sheet metal components
The objective of this paper is to develop a set of principles for extracting, recognizing and reasoning about features from sheet metal parts which are created in the CAD system. Recognition of such features will enable the automatic evaluation of designs and the development of process plans by among other things, mapping form features to tools needed to produce the form. The principles are developed by studying the face-oriented representations of features and deriving concepts which relate the features geometrically and topologically. Subsequently, the processes that relate to the geometrical forms are used to further uniquely identify the features.
Russian Imperialism from Ivan the Great to the Revolution
Chapter 1 Preface to the Paperback Edition Chapter 2 Foreword Chapter 3 Introduction Chapter 4 The Origins of Russian Imperialism Chapter 5 Pan-Slavism or Pan-Russianism Chapter 6 Russia and the Baltic Chapter 7 Russo-Polish Confrontation Chapter 8 The Ukraine and Muscovite Expansion Chapter 9 Russian Domination in the Balkans Chapter 10 Russian Penetration of the Caucasus Chapter 11 Russian Conquest and Colonization of Central Asia Chapter 12 Russian Designs on the Far East Chapter 13 Notes Chapter 14 About the Authors Chapter 15 Index Chapter 16 Maps