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Generalized modal balancing for non-isotropic rotor systems

机译：非各向同性转子系统的广义模态平衡

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摘要

This paper primarily aims at the new generalized modal balancing for non-isotropic rotor systems. The method is based on the derived unbalance modal responses from the complete modal analysis for non-isotropic rotor systems. We found, from investigating the modal configuration to be balanced, that the isotropic and asymmetric rotor systems appear a single 1X harmonic, whereas the anisotropic and general rotor systems appear duel and multiple harmonics, respectively. Furthermore, for the asymmetric and general rotor systems, each harmonic is combined with the multiple modal parameters. The peculiar feature for balancing the non-isotropic rotor systems is that the additional right eigenvector and counter excitation in stator to cancel the anisotropy are required to suppress effectively the total residual response. In this process, the concept of the dominant balancing mode is drawn from the definition of the major harmonic. Also it is suggested that the balancing performance is dependent upon the degree of accuracy of the unbalance modal response that is approximated by the dominant mode at a critical speed. The numerical simulations of the simple general rotor model with one balancing plane are performed to demonstrate the theoretical findings and effectiveness of the proposed method for non-isotropic rotor systems.
机译：本文主要针对非各向同性转子系统的新型广义模态平衡。该方法基于从非各向同性转子系统的完整模态分析中得出的不平衡模态响应。通过研究模态配置是否平衡，我们发现各向同性和非对称转子系统出现了一个1X谐波，而各向异性和普通转子系统分别出现了双重和多重谐波。此外，对于非对称和通用转子系统，每个谐波都与多个模态参数结合在一起。平衡非各向同性转子系统的独特功能是，需要附加的右特征向量和定子中的反激来消除各向异性，才能有效地抑制总的残余响应。在此过程中，从主要谐波的定义中得出主导平衡模式的概念。还建议平衡性能取决于不平衡模态响应的准确度，该不平衡模态响应在临界速度下由主导模态近似。对具有一个平衡平面的简单通用转子模型进行了数值模拟，以证明所提出的方法用于非各向同性转子系统的理论发现和有效性。

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