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Research Papers: Applications

Using Design of Experiments to Analyze the Connecting Rod Big-End Bearing Behavior

[+] Author and Article Information
Arthur Francisco

Laboratoire de Mécanique des Solides, Université de Poitiers, UMR CNRS 6610, 4 Avenue de Varsovie, 16021 Angoulême Cedex, Francearthur.francisco@univ-poitiers.fr

Aurelian Fatu, Dominique Bonneau

Laboratoire de Mécanique des Solides, Université de Poitiers, UMR CNRS 6610, 4 Avenue de Varsovie, 16021 Angoulême Cedex, France

J. Tribol 131(1), 011101 (Dec 02, 2008) (13 pages) doi:10.1115/1.2991175 History: Received September 24, 2007; Revised August 25, 2008; Published December 02, 2008

Reducing the frictional loss in internal combustion engines (ICE) represents a challenge, in which all car manufacturers are involved. This concern has two origins. The first one is the fuel cost, which increases over the years. The second is strongly linked to ecology: people feel more and more concerned by the greenhouse effect, partly resulting from fuel consumption. Many projects involving several laboratories and lead by car manufacturers have this particular point as main subject, with the goal to reduce the ICE fuel consumption by decreasing the friction power loss. This aim can be partly achieved with a better knowledge of the connecting rod big-end bearing functioning. A lot of theoretical and experimental studies have been carried out, resulting in efficient models for numerical simulations, but at the time, no known ambitious parametric study has been planned, to determine the most influent parameters and to quantify their effects on power loss. The present work is a first step to bridge the gap between the potential of recent numerical simulations and the need for a better understanding of the connecting rod big-end bearing functioning. To plan the numerical simulations, it will be taken advantage of design of experiment techniques, which provide an efficient way of preparing the series of experiments with a minimum of runs. Thus, these techniques are illustrated through the variable combination run, test results generated, and interpretations made to identify the dominate factors impacting the responses of interest.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Connecting rod CAD and mesh

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Figure 2

Connecting rod elements and axes conventions

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Figure 3

Lemon (left) and barrel (right) shapes

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Figure 4

Load variations at 4500 rpm

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Figure 5

Load variations at 6000 rpm

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Figure 6

Influence of a barrel shaft

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Figure 7

Goodness of the model

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Figure 8

Effects of factors on power loss

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Figure 9

Effects of factors on the maximum film pressure

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Figure 10

Effects of factors on the flow rate

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Figure 11

Effects of factors on the minimum film thickness

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Figure 12

Effects of factors on the temperature

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Figure 13

Deleted studentized residuals for the flow rate

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Figure 14

Effect of radial clearance on flow rate (l/min)

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Figure 15

Normalized responses evolution with respect to radial clearance

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Figure 16

Example of elastic deformation, film thickness and pressure shapes (run 6, crank angle of 80 deg)

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Figure 17

Oil supply impact on the pressure field (run 8, crank angle of 352 deg)

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Figure 18

Oil supply trail (run 15, crank angle of 204 deg)

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