Probabilistic Vibration Analysis of a Mistuned Integrally Bladed Disk

Abstract:

Abstract. The objective of this paper is to probabilistically evaluate the effects of mistuned sectors on the dynamic characteristics of an integrally bladed disk (blisk). Small blade to blade physical variation in a disk is termed as mistuning. In this study, the dynamic characteristics of the perfectly tuned blisk were firstly analysed as a baseline. Secondly, a probabilistic approach is used for the mistuning analysis of a blisk. A reduced-order method named as the subset of nominal modes (SNM) was used to generate modes for a mistuned blisk from a cyclic perfectly tuned FE model without creating the full model. Furthermore, as only the modes with natural frequencies close to the modes of interest were considered, a relatively shorter computational time and a much smaller model size than a full blisk model is used. Therefore, the dynamic characteristics of the forced response for random mistuned blisks were obtained.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 726-731
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.726
• Online since: March 2014
• Authors: Guang Xia Chen, Jian Fu Hou
• Keywords: Blisk, Forced Response, Mistuning, Natural Frequency, Probabilistic Mistuning Method

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