Product-Oriented Sensitivity Analysis for Multistation Compliant Assemblies

[+] Author and Article Information
Jianpeng Yue, Melida Chin

Department of Mechanical Engineering, The University of Michigan, Ann Arbor, MI 48109

Jaime A. Camelio

Department of Mechanical Engineering—Engineering Mechanics, Michigan Technological University, Houghton, MI 49931

Wayne Cai

Manufacturing Systems Research Lab, GM R&D Center, Warren, MI 48090

J. Mech. Des 129(8), 844-851 (Jul 25, 2006) (8 pages) doi:10.1115/1.2735341 History: Received November 16, 2005; Revised July 25, 2006

Dimensional variation in assembled products directly affects product performance. To reduce dimensional variation, it is necessary that an assembly be robust. A robust assembly is less sensitive to input variation from the product and process components, such as incoming parts, subassemblies, fixtures, and welding guns. In order to effectively understand the sensitivity of an assembly to input variation, an appropriate set of metrics must be defined. In this paper, three product-oriented indices, including pattern sensitivity index, component sensitivity index, and station sensitivity index, are defined. These indices can be utilized to measure the variation influence of a pattern, an individual part, and/or component, and components at a particular station to the dimensional quality of a final assembly. Additionally, the relationships among these sensitivity indices are established. Based on these relationships, the ranges of the sensitivity indices are derived. Finally, a case study of a sheet metal assembly is presented and discussed to illustrate the applicability of these metrics.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Assembly process example

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Figure 2

Finite element model for an automotive side frame structure

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Figure 3

Component sensitivity for Parts 1–3



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