单螺杆挤出机生产率精确控制的研究

研究了单螺杆挤出机生产率的精确控制问题。首先建立了被控对象的数学模型，并分析了被控对象的特性。然后通过对控制过程进行仿真，得出了时间滞后是影响控制质量的最主要因素这一结论。要克服时间滞后的影响，单一的PID反馈控制不能解决问题，因此提出了前馈与反馈相结合用于生产率控制的控制方法，并证明了即使不太精确的前馈环节也能较好地发挥削弱生产率波动的作用。

Research on Accurate Control of the Output Rate of A Single Screw Extruder

The accurate controlling of a single screw extruder was studied. A mathematic model of the extruder was developed,with which the characteristic in question was analyzed.Through the emulation of the control process,it was concluded that the time lag is the main factor controlling the quality.A single PID feed back controller was not effective enough to overcome the influence of time lag.For this reason a method which combined the feedback and feedforward controls was developed for the extruder output rate controlling.It was also demonstrated that a feedforward model,even though not accurate enough,can still decrease the fluctuating of the extruder output.