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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >METHOD FOR SELECTING MASTER DEGREES OF FREEDOM FOR ROTATING SUBSTRUCTURE
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METHOD FOR SELECTING MASTER DEGREES OF FREEDOM FOR ROTATING SUBSTRUCTURE

机译：旋转子结构的主自由度的选择方法

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摘要

A method of selecting master degrees of freedom (DOFs) for rotating substructure is presented in this paper to obtain reduced 3D rotor models. Fixed modes of the substructure below thrice the operating frequency are analyzed. According to each mode shape, the DOFs at where main kinetic energy locates are selected as master DOFs to decrease missing of dynamic coupling. Additional DOFs may be selected based on traditional substructure method. In the stationary reference frame, frequency-dependent gyroscopic effects can be included as damping matrices changing with spin speed. Besides, by selecting appropriate substructure, localized damping and key parts of the rotor for analysis can be kept the same as the original model. A reduced model of a high pressure rotor amply demonstrated the capability of the method in reducing the model size and increasing the computational efficiency with less than two percent error.
机译：本文提出了一种选择用于旋转子结构的主自由度（DOF）的方法，以获得简化的3D转子模型。下面分析三次固定结构的工作频率。根据每个模式形状，选择主动能所在的自由度作为主自由度，以减少动态耦合的丢失。可以基于传统的子结构方法选择其他自由度。在固定的参考系中，随旋转速度而变化的阻尼矩阵可以包含与频率有关的陀螺效应。此外，通过选择适当的子结构，可以使转子的局部阻尼和关键部件保持与原始模型相同。简化的高压转子模型充分证明了该方法在减小模型尺寸和提高计算效率方面的能力，且误差不到2％。

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