Abstract
Abstract The blade is a key part of an aircraft engine because its geometry and manufacturing quality affect engine performance and the lift time of the airplane. Therefore, blade inspection is a key aspect of engine quality. Measuring and analyzing airfoil section parameters and geometric tolerance are essential but complex tasks in blade inspection. This study focuses on the airfoil geometry. Dimensional inspection of complex geometry parts by coordinate measuring machines is a common practice in both the automotive and aerospace industries. The conventional approach is to accept or reject parts according to inspection data. This study used a method of evaluating the capability of the blade manufacturing process to produce blades that conform to the profile specifications. The blade is possessed of multiple characteristics. All these characteristics influence the blade manufacturing process yield. An overall yield measure index CpkT is used for performing accurate yield assessments of processes with multiple characteristics. That is, the index is a generalization of the index Cpk. The applied method measures the process capability to produce a blade that meets the manufacturing specifications considering multiple product quality characteristics, including the segments of the airfoil section.
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