摘要
通过大量数学仿真研究试验，说明数字PID控制对于位置液压伺服机构是一种有效和可取的控制策略。为使系统获得比较满意的静态误差，本文又提出了用模糊控制和数字PID控制简单结合的控制策略，即复合数字PID控制策略，使系统在避开阀门“死区和零漂电流”的情况下工作。最后，用谐波相关法从系统闭环频率特性推导系统开环频率特性的方法，对数字PID控制及复合数字PID控制的稳定性进行分析、讨论．得出两种控制策略的位置液压伺服机构都能稳定工作的结论。
Based on the massive mathematic simulation experiment, it is demonstrated that PID control is an effective and available control strategy. In order to make the ideal static error of the servo system, the paper puts forwards the simple integrated control strategy of fuzzy control and digital PID control, i.e. composite digital PID control strategy, in order to make the system to operate avoiding the dead zone and zero drift current. Finally, harmonic wave correlative method is adopted, which is used to deduce the system property from closed-loop frequency to open-loop frequency characteristics, to discuss and analyse the stability of digital PID control and composite digital control, and present the conclusion that both control strategies can make the position hydraulic pressure servo mechanism operate well and stably.
关键词
位置液压伺服机构
数字PID控制策略
稳定性分析
Position Hydraulic Pressure Servo Mechanism, Digital PID Control Strategy, StabilityAnalysis.
