Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 17 Jan 2018 My Price 7.00

pollution control system

Part of the pollution control system of an automobile engine consists of a nylon tube inserted in a flexible elastomeric connector. The tubes had been coming loose, so an experimental program was undertaken to improve the robustness of the design. The effectiveness of the design was measured by the pounds of force needed to pull the nylon tube out of the connector. The control factors for this design were:

 

A—interference between the nylon tube and the elastomer connector

B—wall thickness of the elastomer connector

C—depth of insertion of the tube in the connector

D—the percent, by volume, of adhesive in the connector pre-dip

The environmental noise factors that conceivably could affect the strength of the bond had to do with the conditions of the pre-dip that the end of the connector was immersed in before the tube was inserted. There were three:

X—time the predip was in the pot 24 h and 120 h

Y—temperature of the predip 72°F and 150°F

Z—relative humidity 25% and 75%

(a) Set up the orthogonal arrays for the control factors (inner array) at three levels and the noise factors (outer array). How many runs will be required to complete the tests?

(b) The calculated S/N ratio for the pull-off force of the tube for the nine experimental conditions of the control matrix are, in order:

(1) 24.02; (2) 25.52; (3) 25.33; (4) 25.90; (5) 26.90; (6) 25.32; (7) 25.71; (8) 24.83; (9) 26.15.

What type of S/N ratio should be used? Determine the best settings for the design parameters.

Answers

Maurice Tutor
(5)
Status NEW Posted 17 Jan 2018 07:01 PM My Price 7.00

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