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Toward a Theory for Design of Kinematically Constrained Mechanical AssembliesMIT Center for Technology, Policy, and Industrial Development, and MIT Center for Innovation in Product Development
I2, Inc.
Evans and Sutherland Computer Corporation
Stanford University, Department of EECS This paper summarizes a theory to support the design of assemblies. It describes a top-down process for designing kinematically constrained assemblies that 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). The process 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 creates a connective data model containing 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.
Key Words: assembly kinematic constraint determinate assembly screw theory tolerance analysis of assemblies feature-based design of assemblies assembly-sequence analysis
The International Journal of Robotics Research, Vol. 18, No. 12,
1235-1248 (1999) |
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