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These notes summarize my experience modeling all moving parts of the DARPA diesel engine with Pro/Engineer 8.0. The purpose of the exercise has been to investigate the suitability and effectiveness or the design paradigm of an industrial modeling system. This document covers about : 1 Introduction 2 2 The Modeling Process in Pro/Engineer 2 3 Stored Representations 3 4 Summary of Modeling Times 3 5 What Pro/Engineer Did Well 4 0 Where Pro/Engineer Had Problems 5 7 Conclusions. One of the difficulties agile manufacturing lias to address is the problem of implementing design paradigms that interface effectively with all steps of the manufacturing process. To approach this problem, a good strategy might be as follows: 1. Assess concretely the role of the design paradigm in the overall process, and identify the linguistic elements of successful design. 2. Implement the successful concepts in an open-ended, object-oriented problem-solving environment that maximally leverages existing infrastructure. How long does it take to express an in (Industrial-size design on an industrial strength modeling system? How long should it take? To gain some insight into these questions, the DARPA diesel engine has been modeled in Pro/Engineer, version 8.0, on a Silicon Graphics 340 VGX with 64 MB main memory. The specifications for the engine rame from blueprints originally prepared by the Engine Corporation of America The Modeling Process in Pro/Engineer Parts are defined in Pro/Krigineer as a sequence of features, beginning from a base feature (the first fcnhnv). Features generate or modify solid geometry (protrusions, cuts, blends, etc.) or add reference quantities (datuins). Each feature must be explicitly related to features already constructed. The basic design cycle alternates feature specification, or modification, with feature generation, or regeneration. When editing the shape, which can be done at any time, features are added, deleted, or modified. In principle one can edit any feature, changing shape, placement and dimensioning. The changes entailed to dependent features are automatically made. General Boolean operations can be performed in assembly mode.
Tags : design paradigms, design paradigm, solid geometry, linguistic elements, feature generation, base feature, feature specification, oriented problem, vgx, agile manufacturing, silicon graphics, main memory, time features, modeling system, successful design
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