A case study in application of robust design methods to waterjet processes in overhaul and repair of jet engine components
Author(s)Sanchez, Hernando Alejandro, 1970-
Case study in application of robust design principles in jet engine overhaul and repair
Daniel D. Frey.
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The North Berwick Engine Services (NBES) Business Unit at the Pratt & Whitney (PW) facility in North Berwick, Maine has identified the need to develop new for cleaning/stripping parts in the overhaul and repair cycle of jet engine components. I investigate the issues that must be answered for the introduction of a new cleaning technique. The new method uses a waterjet in place of a wet abrasive blast using a novaculite slurry solution. The process used to develop high-pressure waterjet cleaning procedures was based on Robust Design methodology. Robust Design uses orthogonal arrays which allow a large number of variables to be studied with a small number of experiments. This requires selection of key input factors that affect the output characteristics of the product. A set of experiments with seven control factors were run in order to determine the response to two quality characteristics: material erosion and increase in surface roughness. Optimum settings for each one of these seven control factors were established. A verification experiment was run in order to validate predictions made based on the optimum settings. It is estimated that this new cleaning method will yield $1,730,000 of savings over the next five years, eliminate four hours of labor per part, and increase production capacity by two additional person-years.
Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, February 1999.Includes bibliographical references (leaves 92-93).
DepartmentSystem Design and Management Program
Massachusetts Institute of Technology
System Design and Management Program