Designing Assemblies |
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Authors: | D E Whitney R Mantripragada J D Adams SJ Rhee |
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Affiliation: | (1) MIT Center for Technology, Policy, and Industrial Development and Center for Innovation in Product Development, MIT, Cambridge, MA, USA, US;(2) i2 Technologies, Inc., Redwood City, CA, USA, US;(3) Evans and Sutherland Computer Corporation, Salt Lake City, UT, USA, US;(4) Stanford University, Standford, CA, USA., US |
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Abstract: | This paper presents a theory to support the design of assemblies. It brings together prior work in a new synthesis, resulting
in a top-down process for designing assemblies so that they deliver geometric Key Characteristics (KCs) that achieve top level
customer requirements. The theory applies to assemblies that take the form of mechanisms (e.g. engines) or structures (e.g.
aircraft fuselages), but has less relevance to assemblies that take the form of connective or distributive systems (e.g. hydraulic
piping). The theory shows how kinematically constrained (statically determinate) assemblies can be unambiguously designed
to satisfy geometrically-defined customer requirements. The top-down process presented here begins by creating a kinematic
constraint structure and a systematic scheme by which parts are located in space relative to each other, followed by declaration
of assembly features that join parts in such a way as to create the desired constraint relationships. This process captures
design intent by creating a connective data model that contains information to support relevant analyses such as variation
buildup, constraint analysis, and establishment of constraint-consistent assembly sequences. Adjustable assemblies, assemblies
built using fixtures, and selective assemblies can also be described by this theory. Problems arising from multiple KCs and
KC conflict can be identified. Issues unresolved by the theory are also noted. |
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Keywords: | :Assembly – Assembly sequence analysis – Feature-based design of assemblies – Kinematic assembly – Kinematic constraint – Screw theory – Tolerance analysis of assemblies |
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