ABSTRACT The computational efficiency in analysing cyclically loaded structures is a highly prioritised issue for the gas turbine industry, as a cycle-by-cycle simulation of e.g. a turbine disc is far too time consuming. Hence, in this paper, the efficiency of two different procedures to handle computational expansive load cases, a numerical extrapolation and a parameter modification procedure, are evaluated and compared to a cycle-by-cycle simulation. For this, a local implementation approach was adopted, where a user-defined material subroutine is used for the cycle jumping procedures with good results. This in contrast to a global approach where the finite element simulation is restarted and mapping of the solution is performed at each cycle jump. From the comparison, it can be observed that the discrete parameter modification procedure is by margin the fastest one, but the accuracy depends on the material parameter optimisation routine. The extrapolation procedure can incorporate stability and/or termination criteria.

中文翻译：

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应用到圆盘合金材料的处理计算重循环载荷情况的程序

摘要分析循环加载结构的计算效率是燃气轮机行业的一个高度优先的问题，因为例如涡轮盘的逐周期模拟太耗时了。因此，在本文中，评估了两种不同程序处理计算扩展载荷情况的效率，数值外推和参数修改程序，并与逐周期模拟进行比较。为此，采用了本地实现方法，其中用户定义的材料子程序用于循环跳转程序，效果良好。这与全局方法形成对比，全局方法重新启动有限元模拟并在每个循环跳跃时执行解的映射。从比较来看，可以看出，离散参数修改程序是最快的，但精度取决于材料参数优化程序。外推程序可以结合稳定性和/或终止标准。