Dynamic characteristic analysis of rotating composite shell
-
摘要: 根据转动壳体的动力学方程,在利用DMAP对大型有限元软件MSC/NASTRAN二次开发的基础上,采用有限元方法对复合材料层合壳体转动状态下的动力特性进行了研究,分析了科氏力、离心力和横向剪力对固有频率的影响,并与实验结果进行了比较.结果显示由于科氏力的作用,即使在动坐标系下,层合壳体也会出现频率不等的前后行波,横向剪力使壳体的固有频率降低,且随着壳体厚径比的增加其影响显著增加.Abstract: In the dynamic analysis of drum-type composite rotor, not only the dynamic behavior of rotor system but also the vibration characteristic of drum-type composite rotor should be studied. By reprogramming the finite element analysis software MSC/NASTRAN using DMAP program, the dynamic characteristic of rotating laminated composite shell and the influences of coriolis, centrifugal and transverse shearing forces on nature frequencies were investigated andcompared with experimental results. It indicated that coriolis, centrifugal and transverse shearing forces have great influences on the vibration modes of rotating shell. The results also indicated that there exist forward and backward traveling waves even in the rotating coordinate system because of the effects coriolis force.
-
[1] Ohnabe H, Masaki S, Onozuka M, et al. Potential application of ceramic matrix composites to aeroengine components[J]. Composites (Part A), 1999, 30:489~496 [2] Singh S P, Gupta K. Free damped flexural vibration analysis of composite cylindrical tubes using beam and shell theories[J]. Sound and Vibration, 1994, 172(2):171~190 [3] Gupta K. Some issues relating to design and development of an all-composite aero gas turbine engine rotor[J]. Defence Science Journal, 1998, 48(1):93~98 [4] Kumar R R, Rao Y V K S. Free vibrations of multilayered thick composite shells[J]. Computers & Structures, 1988, 28 (6):717~722 [5] 蒋咏秋,陆逢升,顾志建. 复合材料力学[M].西安:西安交通大学出版社,1990 Jiang Yongqiu, Lu Fengsheng, Gu Zhijian. Mechanics of composite material[M]. Xi'an:Xi'an Jiaotong University Press, 1990(in Chinese) [6] 吴 炜. 复合材料鼓式转子系统动力特性的有限元研究. 北京:北京航空航天大学动力系,2001 Wu Wei. A study on the dynamics of drum-type composite rotor by finite element method. Beijing:Department of Jet Propulsion, Beijing University of Aeronautics and Astronautics, 2001(in Chinese) [7] 郭宝亭. 高速旋转壳体的振动特性分析. 北京:北京航空航天大学动力系,1997 Guo Baoting. Vibration analysis of high speed rotating shells. Beijing:Department of Jet Propulsion, Beijing University of Aeronautics and Astronautics, 1997(in Chinese) [8] Lam K Y, Wu Qian. Vibrations of thick rotating laminated composite cylindrical shells[J]. Sound and Vibration,1999, 225(3):483~501 [9] 晏砺堂,朱梓根,李其汉,等. 高速旋转机械振动[M]. 北京:国防工业出版社,1994 Yan Litang, Zhu Zigen,Li Qihan, et al. Vibrations of high speed rotating mechanism[M]. Beijing:National Defence Industry Press, 1994(in Chinese) -
点击查看大图
计量
- 文章访问数: 2734
- HTML全文浏览量: 44
- PDF下载量: 1105
- 被引次数: 0
下载:
