全周1リング翼構造と群翼構造が混在したタービン翼のふれ回りモード特性(機械力学,計測,自動制御)

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This paper describes a theoretical investigation for a traveling mode state of turbine blade with one-ringed blade and grouped blade structures (compound periodic structure) when subjected to engine order excitation. In addition, a series of experiments with a simple blade model is performed by simulating engine order excitation under a non-rotating condition. Ceramic oscillators are attached to all the blades. Each blade is excited by a sinusoidal wave with an inter-blade phase angle corresponding to the traveling mode. As a result, traveling mode of the compound periodic structure was confirmed. All of nodal diameter components in a natural mode behave traveling mode when a natural mode is excited to resonance by engine order excitation. The nodal diameter in which the biggest response is not necessarily correspond to the harmonic excitation order.
2010-11-25