|
Case Study 1: One
Factor Design |
Description
Four shift operators
at a pulp mill each make five pulp handsheets from unbleached
pulp. Reflectance is read for each of the handsheets using a
brightness tester. The goal of the experiment is to determine whether there are
differences between the operators in making the handsheets and
reading their brightness.
Review Study...
|
|
Case Study 2: Two
Level Full Factorial Design |
Description
Four factors may affect the growth of an epitaxial layer on polished silicon wafers. The current
factor settings caused
variations that exceeded the specification. The
experimenters first need to determine which of the factors
significantly affect the
process. Further experiments will then be conducted to optimize
the process.
Review Study...
|
|
Case Study 3: Two
Level Fractional Factorial Design |
Description
A manufacturing
process for an integrated circuit is examined. Five factors may
affect the process. The
objective is to improve the process yield in fewer runs than a full
factorial design would require.
Review Study...
|
|
Case Study 4:
Plackett-Burman Design |
Description
A life test is performed on
weld-repaired castings. There are seven factors that may affect
the life. The objective of the test is to identify the
important factors that affect the life and to improve
the product life.
Review Study...
|
|
Case Study 5:
General Full Factorial Design |
Description
A soft drink
bottler is interested in obtaining more uniform fill heights in
the bottles. The filling machine
theoretically fills each bottle to the correct target height,
but in practice, there is variation around this target, and the
bottler would like to understand better the sources of this
variability and eventually reduce it. The bottler examines three
factors that may affect the fill heights.
Review Study...
|
|
Case Study 6:
Taguchi Orthogonal Array Design |
Description
An experiment studies
the effect of four three-level factors on a fine gold wire
bonding process in an IC chip-package.
Taguchi OA L27 (3^13) is applied to identify the critical
parameters in the wire bonding process.
Review Study...
|
|
Case Study 7:
Central Composite Design |
Description
A chemical engineer is
interested in determining the operating conditions that maximize
the yield of a process. Two
controllable variables influence process yield: reaction time
and reaction temperature.
Review Study...
|
|
Case Study 8:
Box-Behnken Design |
Description
A UV-light system is used to inactivate fungal spores of Aspergillus niger in corn
meal. Three process parameters in the UV-light system will
affect the inactivation results. The goal is to
determine the optimal settings of the factors that will
give the largest reduction of fungal spores.
Review Study...
|
|
Case Study 9:
Taguchi Robust Design |
Description
An experiment seeks to determine
a method to assemble an elastomeric connector to a nylon tube
while delivering the requisite pull-off performance suitable for
an automotive engineering application. The primary design objective is to maximize
the pull-off force, while secondary considerations are to
minimize assembly effort and reduce the cost of the connector
and assembly.
Review Study...
|
|
Case Study 10: One
Factor Reliability Design |
Description
There are three
different materials that can be used in a product. The engineer
wants to know if there is a difference between these three
choices and, if there is a difference, which material is the
best choice in terms of the product life.
Review Study...
|
|
Case Study 11: Two
Level Fractional Factorial Reliability Design |
Description
An experiment studies the reliability of fluorescent lights.
Five two-level factors may affect the product life. The purpose
is to
find the best factor settings to improve the life time.
Review Study...
|
