摘要
通过对典型旋转叶片的有限元分析,讨论了旋转叶片动频特性的“频率转向”和“振型转换”问题,尤其是关于多模态耦合的复杂“频率转向”和“振型转换”的现象和特点.首先讨论了旋转叶片动频特性中的两阶模态间“频率转向”和“振型转换”问题,说明了这种耦合振动问题的机理,然后研究了多阶模态相互耦合所导致的复杂“频率转向”和“振型转换”现象,对其基本特点进行了详细的分析和说明.
By the results from direct finite element analyses, frequency veering and mode shape interaction of rotating blade are studied, especially emphasis is placed on the multimode frequency veering and shape interaction. Firstly the finite element model of a simple geometry blade is given and the mode shapes and natural frequencies of this simple blade are calculated as a function of rotational speed using the ANSYS finite element program. Then frequency veering and shape interaction for the multi-mode and two-mode of rotating blades are discussed respectively. It is shown that except for the frequency veering problem with two-mode coupling, the multi-mode frequency veering and mode shape interaction of rotating blade are more complicate and must be further researched deeply.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2007年第1期8-11,共4页
Journal of Aerospace Power
基金
国家自然科学基金资助(10172014)
航空科学基金资助(03C51032)
关键词
航空、航天推进系统
旋转叶片
多模态耦合
多频率转向
多振型转换
aerospace propulsion system
rotating blade
multi-mode coupling
multifrequency veering
multi-mode shape interaction
