中沢メソッドを用いたガスタービン圧縮機ダブテール溝形状の最適化手法の検討(日本ガスタービン学会創立40周年記念特集)

概要

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To find a way of providing a more reliable dovetail joint structure in a gas turbine compressor, two methods, experimental design and the Nakazawa method, were investigated. Specifically, how shape and tolerance as control and errors factors respectively affect the distribution in the structure was investigated. S-N Ratio and sensitivity was calculated for each evaluated stress by using each shape parameter. We found that no shape parameter can be used to reduce all stress components. The Nakazawa method was used to provide multifunctional optimization using multivariate parameters, and the shape optimization method was developed to minimize the spread between the allowable and the design stress. Results of an evaluation using an error function show that a -10°smaller θ is preferred to the basic angle, and a 10% larger depth is preferred to the basic length, and a width 5% smaller showed a small difference from the basic width.
2013-01-18