含整圈拉筋叶盘系统模态局部化问题研究  

Mode localization analysis for whole circle lashing wire bladed disk

作　　者：王艾伦[1] 黄强[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《机械设计》2013年第1期19-23,共5页Journal of Machine Design

基　　金：国家重点基础研究发展计划(973计划)分课题资助项目(2007CB707706)

摘　　要：建立了含整圈拉筋叶盘系统有限元实体模型,对比分析了有无拉筋叶盘系统的固有特性和模态振型,揭示了整圈拉筋对叶盘系统固有频率及模态局部化的影响规律。研究表明,由于整圈拉筋的存在增大了叶片间的耦合强度,使得叶盘系统固有频率增大,系统的模态分布不再高度密集,且弱化了离心载荷对叶盘系统的应力刚化效应;整圈拉筋的存在导致叶盘系统频率转向特性曲线的相对频率间隙增大,降低了叶盘系统对失谐的敏感度,使得叶盘系统的模态局部化程度减小。The finite element model of whole circle lashing wire bladed disk was established. The natural characteristics and mode shapes of lashing wire bladed disk and free bladed disk were compared. Especially, the effect of whole circle lashing wire on natural frequency and mode localization of bladed disk was analyzed. The results show that natural frequency is increased by wholecircle lashing wire, and the distribution of modes of whole circle lashing wire bladed disk is no longer intensive. The stress stiffening effect generated by centrifugal load is weakened by whole circle lacing wire. The relative gap of frequency veering of bladed disk is increased by whole circle lashing wire, such modification leads to a low sensitivity to mistuning for bladed disk, and the mode localization is reduced too.

关 键 词：整圈拉筋 叶盘 频率转向 失谐 模态局部化 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程] TH113.1[机械工程—机械设计及理论]