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Identification of mistuning and model updating of an academic blisk based on geometry and vibration measurements

机译：基于几何形状和振动测量值的学术性大爆炸的错误识别和模型更新

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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.
机译：在这项工作中，使用基本激励在学术刀片式磁盘上进行实验模态分析，以识别每个刀片的不平衡。光学测量用于获得结构的精确几何形状，并能够将几何模糊与每个叶片相关联。观察到实验确定的模糊和几何模糊之间的差异。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，并且可以认为材料特性是一致的。可以看出，这些差异来自不均匀的夹持条件，并且这种失谐与结构的几何形状的变化具有相同的数量级。由此得出结论，由于许多因素会引入油雾，例如夹紧条件，空气动力阻尼，使用中的磨损等，因此，工业结构油雾的精确表征实际上是虚幻的。

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