Identification of Mistuning and Model Updating of an Academic Blisk Based on Geometry and Vibration Measurements
Identification of Mistuning and Model Updating of an Academic Blisk Based on Geometry and Vibration Measurements
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DOI：
10.1016/j.ymssp.2015.08.006
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发表时间：
2016-02
影响因子：
8.4
通讯作者：
F. Nyssen;J. Golinval
中科院分区：
文献类型：
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作者：
F. Nyssen;J. Golinval
在这项工作中，使用基础激励在学术叶片盘上进行实验模态分析，以识别每个叶片的失调。光学测量用于获得结构的精确几何形状，并能够将几何失谐与每个叶片关联起来。观察到实验确定的失调和几何失调之间存在差异。由于叶片盘是一件式结构，因此叶片和盘之间没有焊接连接，并且可以假设材料性能是均匀的。可以证明，这些差异来自不均匀的夹紧条件，并且这种失调与结构几何形状的变化具有相同的数量级。由此可见，工业结构失谐的精确表征实际上是虚幻的，因为引入失谐的因素有很多，例如夹紧条件、气动阻尼、使用中的磨损等。
In this work, an experimental modal analysis is performed on an academic bladed disk using a base excitation to identify the mistuning of each blade. Optical measurement is used to obtain the exact geometry of the structure and to be able to associate geometric mistuning to each blade. Differences are observed between the experimentally identified mistuning and the geometric mistuning. Since the bladed disk is a one-piece structure, there are no welded connections between the blades and the disk and the material properties can be assumed to be uniform. It can be shown that these differences come from non uniform clamping conditions, and that this mistuning is of the same order of magnitude than the variations in the geometry of the structure. It follows that the precise characterization of mistuning for industrial structures is in practice illusory because of the numerous factors introducing mistuning, such as the clamping conditions, aerodynamic damping, wear in service, etc.