Abstract
The design of experiment (DOE) approach is being investigated at the Arnold Engineering Development Center (AEDC) for possible application to aeromechanical testing of aircraft gas turbine engines. Application of the Structural Test Optimization Program (STOP), designed by AEDC engineers to optimize structural test points, is being examined as an enhancement to the DOE technique. A historical data set, compiled of vibratory stress data from aeromechanical testing of a turbine engine, was obtained using a one-factor-at-atime (OFAT) approach. The OFAT approach violates DOE principles of a symmetric test space and randomization; however, statistical analysis was still possible using commercially available software. The resulting regression model displayed significant curvature, an adjusted R value of 0.897, and a predicted R value of 0.874. All validation points fell well within the prediction intervals. Based on the analysis, a split-plot response surface method, accompanied by a STOP test matrix for model validation, should be further investigated as a possible approach when planning turbine engine aeromechanical test programs.
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