A SHIP DESIGN APPLICATION OF QUALITY FUNCTION DEPLOYMENT TECHNIQUES IN WEIGHT REDUCTION DECISION-MAKING, SAWE Paper No. 3278 Category No. 28

摘要

One of the main responsibilities of ship design management is to develop a product that satisfies all users' requirements through the optimal selection, configuration, integration, operation and control of proprietary systems. However, even with the most prudent management organizations in place, adverse trends may still arise. One such adverse trend may be unexpectedly high weight and/or growth in vertical center of gravity above keel (KG) during the design cycle. Because of the universal effect both weight and KG changes have on design characteristics and their respective (usually) direct relation to cost, it is imperative that any design alternatives that are implemented to correct adverse trends be approached judiciously. Most often, identification of alternatives that specifically provide weight/KG reduction is relatively easy. However, all technical and programmatic goals must be balanced to ensure a successful ship design. Thus, selecting only those alternatives that provide optimal benefit to the entire ship at the least cost is difficult. In the best circumstances, there would be some intuitive measurement scale that could be used for comparison and the best choice among the available alternatives would have a high score according to that scale. By ranking alternatives on the basis of numerical scores, an implied priority is created for those alternatives. When the selection scale is "least cost" for example, the measurement scale is obvious and choosing becomes easy. In ship design situations, however, there is not a single, simple scale for measuring all competing alternatives. More often, there are at least several crucial scales that must be used and often those scales are related to one another in fairly complex ways. In broad-scale, participatory decision making, alternative courses of action arise from different stakeholders with different value systems, and yet this diversity must be accommodated and integrated. Clearly, selection of design alternatives is a critical element of the ship design process. Therefore, it is essential that the selection process is systematic, formalized and accountable. To satisfy this requirement, both Analytical Hierarchy Process (AHP) and Quality Function Deployment (QFD) tools can be used.