Because the stage was controlled by the Neural-Network PID controller in a closed routine, the weights of BP network were adjusted on-line and the parameters of PID controller can be changed in real-time to reduce the displacement error of stage. 神经网络PID控制器对工作台进行闭环控制,能够在线调整网络加权值,实时改变PID控制器的系数,减小工作台的位移误差。
As for the percolation problem of constant pressure boundary and closed boundary, routine method can resolve it. 但对于非封闭边界的渗流问题,采用常规方法不能得到有效的解决。