摘要
针对汽轮机转子热应力有限元分析方法 ,分析常用的位移有限元计算热应力时的精度问题 ,简述应力杂交元、杂交元等多变量杂交有限元的优缺点。分析表明杂交有限元的应力计算结果精度高 ,当杂交有限元应用于转子热应力的计算时 ,热应力与位移具有相同的计算精度 ,而且可以有效地消除位移有限元中温度场插值函数误差对应力场右端项的影响。
In the case of thermal stress analysis of steam turbine rotors based on the finite element methods, the precision in thermal stress calculation by displacement finite element in common use is analyzed. The advantage and disadvantage of the multi-variable hybrid finite elements, the stress hybrid element, the hybrid element etc, are briefly stated. The analysis indicates that hybrid finite element methods have good precision. When hybrid finite element methods are applied in the calculation of thermal stress of rotors, the thermal stress has the same precision as displacement. And the effect is effectively eliminated to the right end term of stress field produced by error of form functions of temperature field in displacement finite method.
出处
《电力情报》
2002年第2期64-66,共3页
Information on Electric Power
关键词
汽轮机
转子
热应力计算
有限元方法
rotor thermal stress
finite element method
hybrid element
mixed variational principle
