Mixed-Level Designs

Experimental Objective

Table 9.1: Factors and Responses for Nylon Experiment

Variable	Name	Levels	Description
Control Factors	INTERFER	Low,	Difference between
		Medium,	outer width of
		High	tubing and inner
			width of connector
	WALL	Thin,	Connector wall
		Medium,	thickness
		Thick
	IDEPTH	Shallow,	Depth of insertion
		Medium,	of tubing into
		Deep	connector
	ADHESIV	Low,	Amount of glue in
		Medium,	connector pre-dip
		High
Noise Factors	TIME	24,120	Time for assembly
	TEMPERAT	72, 150	Temperature
	HUMIDTY	0.25, 0.75	Relative humidity
Response	FORCE		Force to pull tubing
			from connector

The example here was reported by Byrne and Taguchi (1986) and performed by researchers at Baylock Manufacturing Corporation. The researchers were investigating the strength of nylon tubing connections, and they identified the following control factors, noise factors, and response for the experiment, shown in Table 9.1.

The goal of the experiment is to find factor settings that maximize the pull-off force and minimize variation in pull-off force among tubing connections.

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Task List