Abstract
A compressor blade of low aspect ratio is a typical shell-type structure and its natural frequency and vibratory stress are sensitive to a manufacturing tolerance. In designing a blade, the designer should take variation of the vibration characteristics into account, and evaluate vibratory strength of the blade. In this paper, variation of the natural frequency and vibratory stress of the blade is evaluated by the 1st order 2nd moment method in addition to CFD and FEM, and the calculated results are compared with measured ones. From the results, it is confirmed that the variation of the vibration characteristics can be predicted by the simple method proposed in this paper.
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