Compared with the three-dimensional rotor model for a central tie rod rotor, an equivalent one-dimensional model can greatly improve the computational efficiency in rotor dynamics analysis with a certain accuracy. However, little research work can be found on improving the modeling accuracy of one-dimensional models using experimental data. In this paper, a one-dimensional discrete mass model considering pretightening force is proposed for central tie rod rotors to achieve the purpose of both efficient and accurate modeling. Experimental testing and three-dimensional model analysis are used as reference and verification approaches. A sensitivity-based method is adopted to update the proposed one-dimensional model via minimizing the error in the critical speed comparing with the corresponding three-dimensional finite element model which has been verified by a modal test. Prediction of damped unbalanced response is conducted to show the practicality of the updated one-dimensional model. Results show that the method presented in this research work can be used to simulate a complex preloaded rotor system with high efficiency and accuracy.

中文翻译：

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一种高效的中心拉杆转子动力学建模技术

与中心拉杆转子的三维转子模型相比，等效一维模型可以在一定精度下大大提高转子动力学分析的计算效率。然而，在使用实验数据提高一维模型的建模精度方面几乎没有研究工作。本文针对中心拉杆转子提出了一种考虑预紧力的一维离散质量模型，以达到高效、精确建模的目的。实验测试和三维模型分析被用作参考和验证方法。与已通过模态试验验证的相应三维有限元模型相比，采用基于灵敏度的方法通过最小化临界速度误差来更新所提出的一维模型。进行阻尼不平衡响应的预测以显示更新的一维模型的实用性。结果表明，本研究工作中提出的方法可用于高效、准确地模拟复杂的预加载转子系统。