双螺杆挤出机动态特性的传递函数试验研究  

Experimental Study on Transfer Function of Dynamic Characteristics of Twin-screw Extruders

作　　者：罗亚哲 闫宝瑞[1] 何亚东[1,2] 信春玲[1,2] LUO Ya-zhe;YAN Bao-rui;HE Ya-dong;XIN Chun-ling(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology;Engineering Research Center for Polymer Processing Equipment,Ministry of Education)

机构地区：[1]北京化工大学机电工程学院 [2]高分子材料加工装备教育部工程研究中心

出　　处：《化工自动化及仪表》2020年第1期31-36,62,共7页Control and Instruments in Chemical Industry

摘　　要：针对工艺参数变化导致双螺杆挤出机机头压力波动的动态传递函数建模问题,从控制理论的角度,采用阶跃响应法辨识系统,通过阶跃增加或减少螺杆转速与喂料量,得到机头压力p与螺杆转速n之间的传递函数可表示为参数可变的一阶惯性环节与带纯滞后的反向一阶惯性环节之和,两个一阶惯性时间常数T1和T2、两个放大倍数K1和K2、纯滞后时间τ1均是螺杆转速n的函数。机头压力p与喂料转速n1的传递函数为比例纯滞后环节,比例系数K3和纯滞后时间τ2均是螺杆转速n的函数。Considering the modeling of the dynamic transfer function in terms of pressure fluctuations in twin-screw extruder’s head incurred by the changes in process parameters, from the perspective of control theory, the step response method was used for system identification and through increasing or reducing the steps of twin-screw speed and feeding amount, the transfer function between the extruder’s head pressure p and screw speed n was expressed as a sum of variable first-order inertia link and a variable parameter with pure hysteresis. The first-order inertia time constants T1 and T2, the amplification factors K1 and K2 and the pure delay time τ1 are all functions of the screw speed n. The transfer function of the head pressure p and the feed speed n1 is proportional time delay link. Meanwhile, the proportional coefficient K3 and the pure lag time τ2 are both functions of the screw speed n.

关 键 词：机头压力波动 双螺杆挤出机 动态传递函数建模 系统辨识阶跃响应 

分 类 号：TQ056.2[化学工程]