Application of Grey System Theory in Design For Cost (DFC)

Design For Cost (DFC) is a branch of D es ign For X (DFX). In this paper, we defined DFC as a design method that analyzed and evaluated the product′s life cycle cost (LCC), then modified the design to reduce the LCC. Nowadays it is a very difficult thing to obtain LCC data in Chin a or in developing countries. Statistical methods can not be used because availa ble LCC data are few. In order to solve this problem, we used grey system theory . Then relations of cost factors were analyzed in LCC using grey relevant method s, and a GM(1,1) model between design parameters and LCC was established. Using this model, we can estimate and control LCC by changing design parameters at the beginning of the design stage.