长拉杆-止口连接弯曲刚度损失及对转子系统振动响应影响

doi:10.7527/S1000-6893.2020.23861

固体力学与飞行器总体设计

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长拉杆-止口连接弯曲刚度损失及对转子系统振动响应影响

马艳红^1,2, 倪耀宇¹, 陈雪骑¹, 邓旺群^3,4, 杨海^3,4

1. 北京航空航天大学能源与动力工程学院, 北京 100083;
2. 先进航空发动机协同创新中心, 北京 100083;
3. 中国航发湖南机械研究所, 株洲 412002;
4. 中航航空发动机集团航空发动机振动技术重点实验室, 株洲 412002

收稿日期:2020-02-04 修回日期:2020-02-20 发布日期:2020-06-04
通讯作者: 陈雪骑 E-mail:buaachenxueqi@163.com
基金资助:
国家自然科学基金（51575022，11772022）；国家科技重大专项（2017-IV-0011-0048，2017-VII-0010-0104）

Bending stiffness loss of rod-rabbet joints and its effect on vibration response of rotor systems

MA Yanhong^1,2, NI Yaoyu¹, CHEN Xueqi¹, DENG Wangqun^3,4, YANG Hai^3,4

1. School of Energy and Power Engineering, Beihang University, Beijing 100083, China;
2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100083, China;
3. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China;
4. Key Laboratory of Aero-engine Vibration Technology, Aero Engine Corporation of China, Zhuzhou 412002, China

Received:2020-02-04 Revised:2020-02-20 Published:2020-06-04
Supported by:
National Natural Science Foundation of China (51575022, 11772022); National Science and Technology Major Project (2017-IV-0011-0048, 2017-VII-0010-0104)

摘要/Abstract

摘要： 航空燃气轮机为了实现高负荷、轻质化的追求，在转子结构设计中，趋向于提高转速和加大长径比。这使得转子系统弯曲模态临界转速降低，转子在工作转速范围内不可避免会产生一定的弯曲变形。转子弯曲变形会影响连接结构界面接触特性的变化，使其连接结构局部弯曲刚度产生损失。因此，对于工作转速靠近弯曲临界的高速转子系统，需要考虑连接结构界面接触状态变化对转子系统振动特性的影响。以高负荷的长拉杆-止口连接转子系统为对象，分析连接界面接触应力分布特性，提出连接结构弯曲刚度损失修正方法，以此为基础建立界面连接转子动力学模型。通过对止口连接三级轴流压气机转子结构动力学特性的仿真和试验研究表明，在靠近弯曲振型临界转速下，转子连接界面接触状态的变化会产生弯曲刚度损失，对转子动力学特性具有显著影响。

关键词: 非连续结构, 转子系统, 止口连接结构, 弯曲刚度, 动力特性

Abstract: With the pursuit of higher output power and light weight of the aero-engine structure, the stiffness of the rotor structure has to be weakened, while the operational speed of the rotor is increased. These changes induce large bending deformation on the rotor in operation. The rotor structure system with multiple joints will experience a sudden change in contact characteristics at the joint interface when the rotor is exerted by the bending moment, and this sudden change will weaken the bending stiffness of these joints. Therefore, in the design span of the high-speed rotor system, the bending stiffness loss of the joint structure must be considered. In this paper, the contact status and stress distribution of the rod-rabbet joint interfaces are analyzed, followed by the establishment of the bending stiffness model of the joint. Based on the bending stiffness model, the dynamics of a typical rotor system is investigated. The simulation result reveals that the stiffness loss of the joints can significantly affect the dynamic characteristics of the rotor system, hence verifying the correctness of the bending stiffness loss model of the joint.

Key words: discontinuous structures, rotor systems, rabbet joints, bending stiffness, dynamics

中图分类号:

V231.96

马艳红, 倪耀宇, 陈雪骑, 邓旺群, 杨海. 长拉杆-止口连接弯曲刚度损失及对转子系统振动响应影响[J]. 航空学报, 2021, 42(3): 223861-223861.

MA Yanhong, NI Yaoyu, CHEN Xueqi, DENG Wangqun, YANG Hai. Bending stiffness loss of rod-rabbet joints and its effect on vibration response of rotor systems[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(3): 223861-223861.

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E-mail：hkxb@buaa.edu.cn

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长拉杆-止口连接弯曲刚度损失及对转子系统振动响应影响

Bending stiffness loss of rod-rabbet joints and its effect on vibration response of rotor systems

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