State Space Modeling of Sheet Metal Assembly for Dimensional Control

[+] Author and Article Information
Jionghua Jin, Jianjun Shi

Department of Industrial and Operations Engineering, The University of Michigan, Ann Arbor, MI 48109-2117

J. Manuf. Sci. Eng 121(4), 756-762 (Nov 01, 1999) (7 pages) doi:10.1115/1.2833137 History: Received April 01, 1998; Revised December 01, 1998; Online January 17, 2008


In this paper, a state space modeling approach is developed for the dimensional control of sheet metal assembly processes. In this study, a 3-2-1 scheme is assumed for the sheet metal assembly. Several key concepts, such as tooling locating error, part accumulative error, and re-orientation error, are defined. The inherent relationships among these error components are developed. Those relationships finally lead to a state space model which describes the variation propagation throughout the assembly process. An observation equation is also developed to represent the relationship between the observation vector (the in-line OCMM measurement information) and the state vector (the part accumulative error). Potential usage of the developed model is discussed in the paper.

Copyright © 1999 by The American Society of Mechanical Engineers
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