东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (8): 1115-1121.DOI: 10.12068/j.issn.1005-3026.2019.08.010

• 机械工程 • 上一篇    下一篇

考虑弹性支承的旋转凸肩叶片动力学特性分析

马辉1,2, 崔璨 1, 曾劲 1, 闻邦椿 1   

  1. (1. 东北大学 机械工程与自动化学院, 辽宁 沈阳110819; 2. 上海交通大学 机械结构强度与振动国家重点实验室, 上海200240)
  • 收稿日期:2018-08-15 修回日期:2018-08-15 出版日期:2019-08-15 发布日期:2019-09-04
  • 通讯作者: 马辉
  • 作者简介:马辉(1978-), 男, 河北安平人,东北大学教授,博士生导师; 闻邦椿(1930-),男,浙江温岭人,东北大学教授,博士生导师,中国科学院院士.
  • 基金资助:
    国家自然科学基金资助项目(11772089); 中央高校基本科研业务费专项资金资助项目(N170308028, N180708009); 辽宁省高等学校创新人才支持计划项目 (LR2017035).

Analysis of Dynamic Characteristics of the Rotating Shrouded Blade Considering Elastic Support

MA Hui1,2, CUI Can1, ZENG Jin1, WEN Bang-chun1   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China; 2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai 200240, China.
  • Received:2018-08-15 Revised:2018-08-15 Online:2019-08-15 Published:2019-09-04
  • Contact: MA Hui
  • About author:-
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摘要: 利用解析方法对考虑弹性支承的凸肩叶片进行动力学建模,在解析模型中考虑叶片的旋转效应、安装角、扭转角以及凸肩位置处截面变化的影响.利用ANSYS软件建立了相对应的有限元模型,验证了所建立的解析模型的有效性.通过所建立的解析模型和有限元模型,分析了叶根处支承刚度和凸肩位置对叶片动力学特性的影响.研究结果表明:随着叶根处支承刚度的增加,叶片的固有频率升高,但支承刚度增加到一定程度后,支承刚度的增加不再引起固有频率的升高;随着凸肩位置至叶尖距离的增加,叶片的第1阶和第3阶固有频率有升高的趋势,而第2阶固有频率则会随之降低.此外,采用解析方法能够明显提高计算效率.

关键词: 凸肩叶片, 弹性支承, 变截面, 动力学特性

Abstract: An analytical model of the shrouded blade considering elastic support is established, in which the influence of the blade’s rotational effect, setting angle, twist angle and variable cross-section are taken into consideration. ANSYS software is used to establish a corresponding finite element model to verify the effectiveness of the established analytical model. The influence of the support stiffness and shoulder position on the dynamic characteristics of the blade is analyzed through the established analytical model and finite element model. The results indicate that as the support stiffness increases, the natural frequency of the shrouded blade increases. However, after the support stiffness increases to a certain extent, the increase of the support stiffness will no longer cause the increase of the natural frequency. In addition, as the distance from the shoulder position to the blade tip increases, the first-order and third-order natural frequency of the shrouded blade tends to increase. In contrast, the second-order natural frequency will decrease. In addition, analytical methods can significantly improve the computational efficiency.

Key words: shrouded blade, elastic support, variable cross-section, dynamic characteristics

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