It is very important for the systems' analysis and designs to grasp the variation regularity of system performance with parameters. In the second-order systems, the proportion-differential control and tachometer feedback control are used to improve its property generally. The system before and after correction is simulated with Matlab. The result of a second-order system performance improved separately by two methods is analyzed. Through the calculation with an instance, both control methods of proportion-differential control and tachometer feedback control can improve the rapidity and stability of the system. The simulation result indicates that both of the two methods can observably improve the performance of second-order systems.%掌握系统性能随参数变化的规律性,对于分析和设计系统是十分重要的.在二阶系统中,一般采用比例-微分控制和测速反馈控制改善其性能.这里利用Matlab对校正前后的系统进行仿真,分析两种方法对二阶系统性能改善的效果.同时通过实例计算,得出比例-微分控制和测速反馈控制均可使系统快速性和稳定性提高.仿真结果表明,两种方法均可显著改善二阶系统的性能.
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