Process capability indices (PCIs) for processes with symmetric
tolerances have received substantial research attention. But, PCIs for
processes with asymmetric tolerances have been comparatively
neglected. Recently, Boyles (1994) reviewed the existing PCI literature
and proposed several new indices to handle processes with asymmetric
tolerances. In this paper we analyze PCIs based on various process
characteristics, then introduce a new class of capability indices to
handle processes with asymmetric tolerances. The proposed new indices
are compared with existing PCIs in terms of process yield, process
centering, and process characteristic related to loss functions. The results
indicate that the new indices are superior to the existing capability
indices, and provide greater accuracy in current applications using
PCIs to measure process potential and performance.
關聯:
Journal of The Chinese Institute of Engineers, 24(5), 559-568
