摘要
在文献［３］的基础上，进一步探讨了高速旋转时，离心惯性力产生的旋转软化效应对增压器涡轮叶 片模态特性的影响。介绍了旋转软化效应的理论基础，给出了考虑旋转软化效应的三维振动方程有限元 列式。在一维情形下，进行了旋转软化及应力刚化模态问题的讨论。对文献［３］中的涡轮进行了仅考虑旋 转软化效应及同时考虑旋转软化和应力刚化的模态分析。计算结果表明，仅考虑旋转软化时，旋转状态 涡轮叶片的固有频率较零速时低；但与应力刚化相比，旋转软化对涡轮叶片模态特性的影响较小，因此 综合考虑旋转软化和应力刚化时涡轮叶片的固有频率仍较零速时高。
In order to get the modal characteristics of turbine blades in working state more accurately and extensively,the influence of spin softening produced by centrifugal force was further studied based on the reference [3]. The theory basis of spin softening was introduced and the finite element implementation of the three- dimensional vibration equation with considering the influence of spin softening was presented. The one- dimensional modal problem of spin softening and stress stiffening was discussed. The modal analysis of the turbine blade in reference ER[3] considering spin softening only and considering both spin softening and stress stiffening was done. The results show that the natural frequencies of the turbine blade in rotating state was lower than the ones in static state when considering spin softening only;but the influence upon the turbine blade produced by spin softening was less than the influence produced by stress stiffening. So,the natural frequencies of the turbine blade in rotating state was still higher than the ones in static state when considering both spin softening and stress stiffening.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2000年第1期77-79,共3页
Transactions of Csice
关键词
有限元
涡轮叶片
模态分析
旋转软化
增压器
FEM
Turbine blade
Modal analysis
Spin softening
Stress stiffening
