| Citation: | ZHANG Yuan, ZHAO Jingchao, ZHOU Biao, et al. Modeling and identification of geometric mistuning in blisks based on optical geometry measurement[J]. Journal of Aerospace Power, 2023, 38（1）：61-69 doi: 10.13224/j.cnki.jasp.20210407
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Establishing a model for description of blade geometric mistuning is one of the fundamental problems for dynamic analysis of blisk. The blade profile difference (geometric mistuning) was captured accurately by using optical geometry measurement technology and then a high-fidelity blisk modeling method was established. According to the core idea of this method, an accurate point cloud representing blade geometries was built by means of advanced three-dimensional structured blue light scanning system. An adaptive mesh deformation technology was developed to automatically project the finite element model nodes of the blade to the measured point cloud. Without solid model reconstruction in the traditional reverse engineering, it enabled rapid generation of high-fidelity blisk model. The high-fidelity blisk model can be directly used to quantitatively capture the influence of blade geometry variations on both its natural frequencies and mode shapes. Frequency mistuning of each blade was within 2.1%, and the modal assurance criterion between each blade can be accurately compared. It is thus able to significantly improve the accuracy of modeling and dynamic analysis of blisk.
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