双螺杆挤出机集总参数控制模型

O. K. Amedu, R. Penlington, K. Busawon, A. Morgan
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引用次数: 1

摘要

本文采用统计技术和力学建模相结合的方法,建立了自擦拭双螺杆挤出机塑化混合过程的理论物理集总参数模型。该模型通过停留时间密度分布(RTD)描述了挤出机对进给量和螺杆转速输入信号的时域响应。结果表明,RTD是指挤出机对输入信号的脉冲响应。考虑塑化过程中的流动特性及其与螺杆构型的相互作用,采用力学建模的方法建立了平均停留时间和平均时滞的预测模型,估计了RTD函数的参数。分析表明,混合过程的演变取决于进给量(Q)和螺杆转速(N)的组合,进给量对RTD曲线形状的影响较大。通过确定挤出机中物料分布的变化来优化该工艺。该模型在时域上以脉冲响应函数f(t)的形式表示,适于控制器的设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A lumped parameter control model for twin-screw extruders
In this paper, we propose a theoretical physical lumped parameter model for the mixing process in plasticizing self-wiping twin screw extruders using a combination of statistical techniques and mechanistic modelling. The model describes the response of the extruder to input signals of feed rate and screw speed in the time domain via residence time density distribution (RTD). It is shown that the RTD refers to the impulse response of the extruder to input signals. Parameters of the RTD function are estimated by developing predictive models of the mean residence time and mean time delay by way of mechanistic modelling, taking into consideration the flow behavior during the plasticizing process and its interaction with the screw configuration. Analyses show that the evolution of the mixing process is dependent on the feed rate (Q) and screw speed (N) combination, with the feed rate having a greater impact in changing the shape of the RTD curve. The process is optimized by determining the variance of the material distribution in the extruder. The model is presented in the form of an impulse response function f(t) in the time domain suitable for the design of a controller.
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