燃气轮机拉杆转子抗弯刚度分析
Analysis of Bending Stiffness of Rod Fastened Rotor for Gas Turbine
赵博 1潘渤 1杨青 1姜广政 1张恒 2阚选恩3
作者信息
- 1. 西安热工研究院有限公司,西安 710054;西安西热节能技术有限公司,西安 710054
- 2. 西安热工研究院有限公司,西安 710054
- 3. 西安理工大学 机械与精密仪器工程学院,西安 710048
- 折叠
摘要
为提高计算效率,发展了一种计算抗弯刚度的简便算法.该算法利用接触压力在接触面上近似线性分布的特点,在给定的总体预紧力及弯矩情况下,计算得到接触面上法向应力及分布,结合轮盘的结构特点采用平截面假设,求出抗弯刚度的修正系数,再乘以连续模型的抗弯刚度就可得到界面分离时的抗弯刚度.采用简化算法得到的抗弯刚度与三维有限元接触算法计算结果相差在 5.8%以内,计算所需时间为后者的 1%,证明了本算法的高效性;以某F级重型燃气轮机转子为例,综合考虑了界面局部分离和粗糙度对转子整体刚度的影响,并研究了预紧松弛对转子固有频率的影响.
Abstract
To improve computational efficiency,a simple algorithm for bending stiffness correction factor calculation is developed.Using the material mechanics approach,the bending stiffness correction factor is obtained.The error range of the result obtained is 5.8%,and the time consumed is less than 1%compared with 3D finite element method which involves contact algorithms.Combine The initial bending stiffness of the rotor shaft calculated by a continuous 3D finite element model with the correction factor obtained,a modified finite element model of one F class heavy duty gas turbine is established.The influence of bending moment on the natural frequencies is computed when the preload is insufficient.
关键词
拉杆转子/抗弯刚度/有限元法/非连续界面Key words
rod fastened rotor/bending stiffness/finite element method/discontinuous interface引用本文复制引用
出版年
2024
NETL
NSTL
万方数据