Based on the Lyapunov method of control theory to analyze the three-level mass-spring-damping sys-tem,and discussed the controllability of the system by signal flow graph,the results show that the system is un-stable.%利用控制理论中的Lyapunov方法对三级质量-弹簧-阻尼系统进行稳定性分析，并用信号流图对系统的可控性做了讨论，结果表明此系统为不稳定系统。
展开▼
