複合周期構造を持つタービン翼の振動特性

概要

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This paper describes the vibration characteristics of turbine blades with compound periodic structures. The structure includes both grouped and one-ringed blade structures in a turbine wheel to form a circumferential periodicity with a packet as a unit. An effective transfer matrix method for calculating the natural frequencies and modes of this type of blade structure is presented by utilizing the feature that the total transfer matrix forms a cyclic matrix. Natural mode analysis reveals that a natural mode is composed of several nodal diameter modes. Consequently, the resonance condition when the blade structure is excited by engine-order excitation is derived in a general form. Natural frequencies and modes of a simple blade model are measured and compared with calculated ones. As a result, the calculated results are found to agree fairly well with measured ones.
社団法人日本機械学会の論文
1993-11-25