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Integration of feature based design and feature recognition 15

Integration of feature based design and feature recognition

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ASME 1995 15th International Computers in Engineering Conference, CIE 1995 and the ASME 1995 9th Annual Engineering Database Symposium collocated with the ASME 1995 Design Engineering Technical Conferences

作者： Han, JungHyun Requicha, Aristides A.G. Programmable Automation Laboratory Computer Science Department Institute for Robotics and Intelligent Systems University of Southern California Los AngelesCA United States

ISBN: (纸本)9780791817018

Process planning for machined parts typically requires that a part be described through machining features such as holes, slots and pockets. This paper presents a novel feature finder, which automatically generates a part interpretation in terms of machining features, by utilizing information from a variety of sources such as nominal geometry, tolerances and attributes, and design features. The feature finder strives to produce a desirable interpretation of the part as quickly as possible. If this interpretation is judged unacceptable by a process planner, alternatives can be generated on demand. The feature finder uses a hint-based approach, and combines artificial intelligence techniques, such as blackboard architecture and uncertain reasoning, with the geometric completion procedures first introduced in the OOFF system previously developed at USC. © 1995 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Gas turbines

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Multiple-goals path planning for coordinate measuring machines

Multiple-goals path planning for coordinate measuring machin...

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IEEE International Conference on Robotics and automation (ICRA)

作者： S.N. Spitz A.A.G. Requicha Programmable Automation Laboratory University of Southern California

Path planning is a crucial step in automatic programming of coordinate measuring machines(CMMs). The goal is to generate an efficient and collision-free path for the CMM to inspect a collection of points. Previous research concentrates on path planning between two points, or sequencing the points without regard to obstacles and collisions. In this paper we propose a practical path planner that considers both sequencing and collision avoidance. The main idea is to create a roadmap of free-space, where the measurement points are nodes in the network. Once all the measurement points are in a single connected component of the roadmap, then a tour of the points is found by solving the appropriate traveling salesperson problem. CMM heuristics are used to construct the roadmap in an efficient and robust manner. The planner has been implemented and tested on real-world mechanical parts.

关键词： Path planning Coordinate measuring machines Probes Collision avoidance Inspection automation Laboratories Automatic programming Road accidents Robustness

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A potential field algorithm for fixture synthesis in 2d

A potential field algorithm for fixture synthesis in 2d

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ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference, DETC-CIE 1996

作者： Penev, Kamen Requicha, Aristides A. G. Programmable Automation Laboratory Computer Science Department and Institute for Robotics and Intelligent Systems University of Southern California Los AngelesCA90089-0781 United States

ISBN: (纸本)9780791897621

A fixture is an arrangement of fixturing modules that locate and hold a workpart during a manufacturing operation. In this work we address the fixturing problem in the plane. We consider fixtures with frictionless point contacts. The focus is on contact point placement and its integration with fixture analysis. A novel method for planar fixture synthesis has been developed. It is a non-deterministic, potential field algorithm for contact point placement. The method provides a basic framework for the integration of heterogeneous high-level fixturing agents through an interface based on zones of attraction and repulsion on the workpart boundary. The algorithm may produce redundant fixtures, and can augment partial solutions to complete form closure fixtures. © 1996 by ASME.

关键词： Fixtures (tooling)

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Interactive Boolean operations for conceptual design of 3-D solids 97

Interactive Boolean operations for conceptual design of 3-D ...

引用

24th Annual Conference on Computer Graphics and Interactive Techniques, SIGGRAPH 1997

作者： Rappoport, Ari Spitz, Steven Institute of Computer Science Hebrew University Jerusalem91904 Israel Programmable Automation Laboratory Computer Science Department University of Southern California Los AngelesCA90089-0781 United States

ISBN: (纸本)0897918967

Interactive modeling of 3-D solids is an important and difficult problem in computer graphics. The Constructive Solid Geometry (CSG) modeling scheme is highly attractive for interactive design, due to its support for hierarchical modeling and Boolean operations. Unfortunately, current algorithms for interactive display of CSG models require expensive special-purpose hardware that is not easily available. Copyright © 1997 by the Association for Computing Machinery, Inc.

关键词： Conceptual design

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Hierarchical constraint satisfaction for high-level dimensional inspection planning

Hierarchical constraint satisfaction for high-level dimensio...

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IEEE International Symposium on Assembly and Manufacturing (ISAM)

作者： S.N. Spitz A.A.G. Requicha Programmable Automation Laboratory Computer Science Department University of Southern California Los Angeles CA USA

Coordinate measuring machines (CMMs) are very precise Cartesian robots that are used for dimensional inspection. High-level inspection planning for a CMM involves spatial reasoning, to determine how to orient the part on the CMM, which probes to use, how to orient the probes, and what measurements to perform. Current planners are incomplete or only solve the problem partially. In this work, we map the inspection planning problem to a hierarchical constraint satisfaction problem (CSP). The solutions to the CSP are inspection plans of good quality. We show how to extract approximate solutions using efficient clustering methods, which do not entail search and backtracking as prevalent in other planners. We describe our implemented planner and experimental results.

关键词： Inspection Coordinate measuring machines Probes Robotics and automation Robot kinematics Clustering methods Path planning Knowledge acquisition Laboratories Computer science

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Fixture foolproofing for polygonal parts

Fixture foolproofing for polygonal parts

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IEEE International Symposium on Assembly and Manufacturing (ISAM)

作者： K. Penev A.A.G. Requicha Programmable Automation Laboratory Computer Science Department and Institute for Robotics and Intelligent Systems University of Southern California Los Angeles CA USA

A modular fixture is an arrangement of fixturing elements (fixels) that locate and immobilize a workpart. A complete algorithm for designing fixtures for polygonal parts in 2-D was proposed by Brost and Goldberg (1994). The algorithm finds all fixtures consisting of three fixed-size locators and one clamp on a regular grid of holes. However, often it is possible to load the workpart into the fixture in an incorrect pose. An incorrect loading may have disastrous consequences when the part program is executed. Therefore, fixtures that permit only one pose for the loaded workpiece are very desirable. We call them foolproof fixtures. In this paper we present an algorithm that accepts a fixture design, produced by the Brost-Goldberg algorithm, and augments it by inserting in certain grid holes foolproofing pins that make the incorrect loading impossible. The algorithm is complete in the sense that it either (i) produces a solution; (ii) terminates without a solution because none exists; or (iii) detects and flags those nongeneric situations it cannot handle. (These occur rarely.) The produced set of foolproofing pins may not be minimal. However, it is not much worse than the minimal one. Experimental results and complexity analysis are provided.

关键词： Fixtures Clamps Pins Algorithm design and analysis Robotics and automation Intelligent robots Laboratories Computer science Intelligent systems

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Automatic fixture synthesis in 3D

Automatic fixture synthesis in 3D

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IEEE International Conference on Robotics and automation (ICRA)

A fixture is an arrangement of fixturing modules that locate and hold a workpart during a manufacturing operation. In this work we consider fixtures with frictionless point contacts and present a method for placement of contact points on a non-prismatic 3D workpart. It is a nondeterministic, potential field algorithm for contact point placement. The method provides a basic framework for the integration of heterogeneous high-level fixturing agents through an interface based on zones of attraction and repulsion on the workpart boundary. The algorithm may produce redundant fixtures, and can augment partial solutions to complete form closure fixtures.

关键词： Fixtures Manufacturing automation Robotics and automation Intelligent robots Laboratories Computer science Intelligent manufacturing systems Computer aided manufacturing Machining Assembly

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