带有阻尼环(套)的篦齿封严装置固有特性的理论及实验

曾亮; 郭雪莲; 李琳

带有阻尼环(套)的篦齿封严装置固有特性的理论及实验

北京航空航天大学能源与动力工程学院, 北京 100083

计量
- 文章访问数: 1424
- HTML浏览量: 5
- PDF量: 425
- 被引次数: 0
出版历程
- 收稿日期: 2006-06-05
- 修回日期: 2006-10-12
- 刊出日期: 2007-07-28

Theoretic and experimental modal analysis of labyrinth air seals with damping-ring/sleeves

School of Jet Propulsion, Beijing University of Aeronautics Astronautics, Beijing 100083, China

摘要

摘要: 以带有开口阻尼环(套)的篦齿封严装置为研究对象, 运用弹性力学、材料力学和接触力学的有关理论研究了阻尼环(套)与封严装置之间的接触压力和接触刚度的求解方法.在此基础上, 根据结构系统动力学理论建立了封严装置/阻尼环(套)组合结构的等效线性系统模型, 并通过模态实验验证了理论模型的正确性.研究了阻尼环的安装位置和阻尼套厚度、宽度、开口量等参数对组合结构固有特性的影响规律.阻尼环在不同的安装位置时对封严装置固有特性的影响较小.阻尼套对封严装置固有特性的影响包括附加质量和附加刚度两方面, 当封严装置结构一定时, 组合结构的固有频率与封严装置自身频率的差异大小取决于阻尼套附加质量和附加刚度的相对比较.由于阻尼环(套)开口较小, 并且它的刚性远低于封严装置的刚性, 组合结构仍大致以周波型振动为主.
- 航空、航天推进系统 /
- 篦齿封严装置 /
- 阻尼环(套) /
- 接触压力 /
- 接触刚度 /
- 模态分析
Abstract: Modal analysis of contact system is complex due to its non-linear and chaotic behaviors in the process.This paper builds up the equivalent linear model of labyrinth air seals with damping-ring/sleeves by introducing local contact stiffness and using vibration mechanic theory.The experimental results of natural frequencies and mode shapes of the labyrinth air seals with damping-ring/sleeves verified the validity of the proposed simplified model and the simulation results by finite element method(FEM).The influence of variable parameters(position,width,thickness and gap size)of damping-ring/sleeves are also studied.
- aerospace propulsion system /
- labyrinth air seals /
- damping-ring/sleeves /
- contact pressure /
- contact stiffness /
- modal analysis

HTML

参考文献(8)

[1]	航空发动机设计手册总编委会.航空发动机设计手册[M].第18册.北京:航空工业出版社,2001.
[2]	Alford J S.Nature,cause,and prevention of labyrinth air seal failures[J].Journal of Aircraft,ASME 1975,12(4):313-318.
[3]	Niemotka M A,Ziegert J C.Optimal design of split ring dampers for gas turbine engines[C]//International Gas Turbine and Aeroengine Congress and Exposition.Cincinati,Ohio:ASME 1993.
[4]	张锦,刘晓平.叶轮机振动模态分析理论及数值方法[M].北京:国防工业出版社,2001.
[5]	张保生.匀弹力变截面开口圆环的弹力集度及强度计算[J].机械科学与技,1994,51(3):95-97.ZHANG Baosheng.The calculation of the elastic force degree and strength of varied section open ring exerted by uniform elastic force[J].Mechanical Science and Technology,1994,51(3):95-97.
[6]	刘鸿文.材料力学[M].北京:高等教育出版社,1979.
[7]	Johnson K L.接触力学[M].北京:高等教育出版社,1992.
[8]	曾亮,李琳.具有接触接合面的封严组件振动特性分析[J].航空动力学报,2006,21(5):854-861.ZENG Liang,LI Lin.The vibration performance of contact system of labyrinth assembly[J].Journal of Aerospace Power,2006,21(5):854-861.