Integrating Target Costing Into Perception-Based Concept Evaluation of Complex and Large-Scale Systems Using Simultaneously Decomposed QFD

[+] Author and Article Information
Shun Takai1

Interdisciplinary Engineering Department, University of Missouri-Rolla, 101 Interdisciplinary Engineering Building, 1870 Miner Circle, Rolla, MO 65409-0210takais@umr.edu

Kosuke Ishii

Mechanical Engineering Department, Design Division, Stanford University, Terman 501, Stanford, CA 94305-4021ishii@stanford.edu


Corresponding author.

J. Mech. Des 128(6), 1186-1195 (Jan 06, 2006) (10 pages) doi:10.1115/1.2336256 History: Received September 22, 2004; Revised January 06, 2006

In the conceptual design phase, engineers may need to perceptually screen and prioritize feasible design concepts by their potential to fulfill both customer and financial requirements. This paper presents a system design methodology that integrates perception-based concept evaluation and target costing of complex and large-scale systems. The methodology decomposes a system into modules and evaluates each module concept with its target requirements and cost. This method proposes the decomposition of quality function deployment matrices simultaneously for both requirements and structure in order to allocate the worth and target cost of the modules in a system. Developed from module concepts that satisfy their target requirements and cost, this new system should better satisfy both customer and financial requirements.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

QFD I (house of quality) and QFD II

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Figure 2

Overview of the methodology

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Figure 3

Performance versus cost diagram

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Figure 4

Indifference curve (p∕c=1.5,2,3,8)

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Figure 5

Conceptual flow of worth allocation

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Figure 6

Simultaneously decomposed QFD matrices and flow of worth

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Figure 7

Schematic of next linear collider

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Figure 9

Focus of the analysis: structures

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Figure 11

Degrees of contribution

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Figure 12

Worth allocation

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Figure 13

Worth of modules

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Figure 8

Schematics of electromagnet and hybrid magnet

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Figure 10

Customer, system, and module requirements

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Figure 14

Worth of requirements

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Figure 15

Selection of the multipole magnet system

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Figure 16

Selection of the permanent magnet



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