说明：  matlab的.m文件为参数设置文件，运行后参数会在workspace里面，simulink调用workspace里面的参数进行仿真。注意，这是一个根据状态空间方程建立的传递函数仿真。
(The.m file of MATLAB is the parameter setting file. After running, the parameters will be in workspace, and Simulink calls the parameters inside workspace to simulate. Note that this is a transfer function simulation based on the state space equation.)