形状誤差を考慮した低アスペクト比薄形翼の振動応答予測

概要

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Stress ratios have been used in inferring the maximum stresses of blades from the measured vibratory stresses. This method may not be applicable to the modern low aspect ratio blades because the patterns of high frequency tip modes (stripe modes) are drastically changed due to slight changes in structural properties. In this paper, the new method to predict the maximum resonant stresses of the stripe modes of low aspect ratio blades is proposed. The maximum resonant stresses of actual blades with geometric variations are predicted, using measured vibration modes of them, calculated vibration modes of the standard blade with the drawing geometry, and a few measured resonant stresses of blades with strain gauges. The validity of the method is verified from the numerical simulation. It is shown that the accuracy of the estimated maximum resonant stress is remarkably improved comparing to the conventional method.
社団法人日本機械学会の論文
2001-06-25