说明：  仿照Matlab simulink自带slcp例程建立的PID和模糊控制方程程序，用于模拟横梁-小球系统（或杆球系统）的模糊控制，程序带有动画演示功能
(Inspired by Matlab-simulink s fuzzy control demo slcp , a simulation with animation for the ball-beam system fuzzy control was implemented here.)