Optimising robust design for correlated quality characteristics

Many industries have employed the Taguchi method over the years to improve product and process performance. This method is powerful and effective in helping manufacturers to design their products and processes as well as to solve troublesome quality problems. Several studies have presented approaches to multiple quality characteristics. Few published articles have focused primarily on optimising the correlated multiple quality characteristics. This research presents an approach to optimising the correlated multiple quality characteristics using principal component analysis and grey relational analysis based on quality loss. As can be seen in the results, the advantage of this approach is that the chosen optimal design for multiple quality characteristics is robust for the correlated multiple quality characteristics. This method finds the optimal parameter conditions more easily, even when the average quality losses of the quality characteristics are all diverse.