Determination of Contact Stiffness of Rod-Fastened Rotors Based on Modal Test and Finite Element Analysis
Determination of Contact Stiffness of Rod-Fastened Rotors Based on Modal Test and Finite Element Analysis
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DOI：
10.1115/1.4000591
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发表时间：
2010-09-01
影响因子：
1.5
通讯作者：
Liu, Shaoquan
中科院分区：
文献类型：
--
作者：
Zhang, Yanchun;Du, Zhaogang;Liu, Shaoquan
制作了一系列不同表面接触粗糙度的简化固杆转子，在自由-自由状态下测量了其在不同预紧力作用下的模态参数。引入表面接触刚度的概念，用有限元法模拟了预紧力对这些简化的杆固转子模态参数的影响。将实验测量结果与有限元分析结果进行了比较和拟合，建立了接触刚度与接触应力之间的关系，其中接触应力由预紧力定义。将该关系式应用于某真实的燃气涡轮机转子的模态分析，其模态试验结果与有限元分析结果吻合较好，证明了该关系式及基于模态试验和有限元分析的接触刚度确定方法的有效性。[DOI：10.1115/1.4000591]
A series of simplified rod-fastened rotors, which have different surface contact roughness are manufactured and their modal parameters under different pretightening force, are measured in free-free state. The concept of surface contact stiffness is introduced to simulate the influence of pretightening force on modal parameters of these simplified rod-fastened rotors using finite element method. The experiment measured results are compared and fitted to the finite element analysis results and the relationship between contact stiffness and contact stress is established in which the contact stress is defined by the pretightening force. The relationship is then applied on the modal analysis of a real gas turbine rotor, and its modal test results and finite element analysis results are consistent with each other, proving that the relationship and the described determination method of contact stiffness based on modal test and finite element analysis are effective. [DOI: 10.1115/1.4000591]