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。
2
In order to accurately calculate casting temperature field, a method of simple variabletimestep 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。
3
The results show that the simulation results fit the theoretic results(by separate variablemethod)very well when the heat capacity matrix is lumped with appropriate timestep.