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TECHNICAL PAPERS

Sensor Optimization for Fault Diagnosis in Multi-Fixture Assembly Systems With Distributed Sensing

[+] Author and Article Information
A. Khan, D. Ceglarek

S. M. Wu Manufacturing Research Center, The University of Michigan, Ann Arbor, MI 48109

J. Manuf. Sci. Eng 122(1), 215-226 (Jul 01, 1998) (12 pages) doi:10.1115/1.538917 History: Received December 01, 1997; Revised July 01, 1998
Copyright © 2000 by ASME
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References

Figures

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Assembly part fixturing schematics for (a) station S3, (b) station S2, (c) station S1 (M1 are candidate sensor locations)
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Top-down approach—second step optimization: Inherent-to-station allocation results
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Top-down approach—second step optimization: (a) combinations for part A allotment computation, (b) combinations for part B allotment computation, and (c) compensatory station allocation results
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Top-down approach—overall sensing distribution (a) station S3, (b) station S2, and (c) station S1
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Sensing approaches: (a) end-of-line sensing, (b) distributed sensing
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Generic 3-2-1 fixture layout and corresponding failure mode fault manifestations
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Assembly representation for optimization for (a) the example four-part widget assembly (S1,S2,S3 represent assembly stations), (b) state-transition representation (for each level l,{{Θ}} is a partition representing assembly state, with element {θl} representing a subassembly or part)
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Optimization implementation sequence: (a) bottom-up, (b) top-down approaches
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Bottom-up approach: (a) results of first step optimization, (b) graphical representation (linearized) of station sensing performance with 3, 2, and 1 sensors
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Bottom-up approach: results of second step optimization
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Bottom-up approach—overall sensing distribution: (a) station S3, (b) station S2, and (c) station S1
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Top-down approach: (a) results of the first step optimization, (b) graphical representation (linearized) of station sensing performance with 3, 2, and 1 sensors

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