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TECHNICAL BRIEFS

Uncertainty Analysis for Fiber Permeability Measurement

[+] Author and Article Information
Chensong Dong

 Rakon Limited, One Pacific Rise, Mt. Wellington, Private Bag 99943, Newmarket, Auckland, New Zealand.chensongdong@yahoo.com

J. Manuf. Sci. Eng 127(4), 907-911 (Mar 06, 2005) (5 pages) doi:10.1115/1.2039947 History: Received March 23, 2004; Revised March 06, 2005

An uncertainty study for fiber permeability measurement is presented in this paper. The sources of uncertainty were identified. This paper focuses on the instrument and environmental uncertainties. The parameter uncertainties of both unsaturated and saturated measurements were estimated based on instrument accuracy limitations and environmental influences. Their influences on the permeability uncertainty were investigated by uncertainty propagation and Monte Carlo simulation. The significant factors affecting the permeability measurement uncertainty were identified. The results show that (1) unsaturated measurement has a higher accuracy than saturated measurement; (2) the significant factors affecting measurement results are pressure and viscosity. Based on the simulation results, the approaches to reduce measurement uncertainty were proposed.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Integrated composite product development

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Figure 2

Channel flow apparatus for measuring preform permeability

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Figure 3

Distribution of permeability measurement

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Figure 7

Histogram from Monte Carlo simulation (saturated measurement, original parameter uncertainties)

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Figure 8

Histogram from Monte Carlo simulation (unsaturated measurement, reduced parameter uncertainties)

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Figure 6

Histogram from Monte Carlo simulation (unsaturated measurement, original parameter uncertainties)

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Figure 5

Viscosity versus temperature

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Figure 4

Dimension chain in the mold cavity depth measurement

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