To overcome the long test time and big error in single variable open loop step test method, a novel identification method based on asymptotic theory (asym) is presented.
为克服传统单变量开环阶跃测试法测试时间长和误差大的缺点，提出一种基于渐进黑箱理论的多变量辨识方法。
In order to accurately calculate casting temperature field, a method of simple variable time step is established which can ensure the precision of casting temperature field and the speed of calculate.
本文中提出了一种较简便确定变时间步长的方法，该方法可以确保温度场的计算精度和计算速度。
The results show that the simulation results fit the theoretic results(by separate variable method)very well when the heat capacity matrix is lumped with appropriate time step.
通过模拟结果与解析解的比较可以看出，在时间步长选择合适的情况下，集中热容矩阵能够很好地解决数值振荡问题；
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