Impact of Prediction Accuracy on Costs - Noise Technology Applications in Helicopters
BOEING VERTOL CO PHILADELPHIA PA
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This study is an extension of the work reported in AD-A083 935, and considers the effect which uncertainties in the prediction and measurement of helicopter noise have on the development and operating costs. Although the number of helicopters studied is too small to permit generally applicable conclusions, the following are the primary results 1 the Effective Perceived Noise EPN Levels tended to be overpredicted for takeoffs, underpredicted for approaches, with no general trend noted for level flyovers 2 prediction accuracy for the cases studied ranged from 1 to 6 EPNdB and 3 test and measurement repeatability can give a range of up to 3 EPNdB. Each helicopter must be studied as an individual case and generalization of cost trends should be avoided.