Reduced-Order Modeling of Bladed Disks Considering Small Mistuning of the Disk Sectors
Reduced-Order Modeling of Bladed Disks Considering Small Mistuning of the Disk Sectors
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DOI：
10.1115/1.4041071
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Lukas Schwerdt;S. Willeke;L. P. Scheidt;J. Wallaschek
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文献类型：
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作者：
Lukas Schwerdt;S. Willeke;L. P. Scheidt;J. Wallaschek
提出了一种基于部件模态综合的失谐叶盘模型降阶方法。在叶片根部的组件之间的接口减少使用基于波的子结构（WBS）的方法，它采用调谐系统模式。首先计算这些系统模式，然后在各个组件的简化过程中使用，这消除了构建具有密集矩阵的部分简化中间模型的需要。对于盘，应用循环Craig-Bampton（CB）约化。然后将各个圆盘扇区的刚度和质量矩阵的偏差投影到圆盘子结构的内部和界面模态的循环基中。因此，除了叶片的大失谐之外，还可以对小的盘失谐进行建模。
A model order reduction method based on the component mode synthesis for mistuned bladed disks is introduced, with one component for the disk and one component for each blade. The interface between the components at the blade roots is reduced using the wave-based substructuring (WBS) method, which employs tuned system modes. These system modes are calculated first, and used subsequently during the reduction of the individual components, which eliminates the need to build a partially reduced intermediate model with dense matrices. For the disk, a cyclic Craig–Bampton (CB) reduction is applied. The deviations of the stiffness and mass matrices of individual disk sectors are then projected into the cyclic basis of interior and interface modes of the disk substructure. Thereby, it is possible to model small disk mistuning in addition to large mistuning of the blades.