Barrel temperature control for quality of thermoplastic polymers in the extrusion process

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Murat Mayda
Keyword(s):  
Temperature Control ◽  
Control Strategy ◽  
Controller Design ◽  
Experimental Testing ◽  
Design Procedure ◽  
Extrusion Process ◽  
Operating Conditions ◽  
Single Screw Extruder ◽  
Performance Specifications

In this paper, the design procedure; modeling and controller design, testing are presented. Extensive tests have shown that the system reacts rapidly to changes in the operating conditions and effectively rejects disturbances due to unexpected changes in the quality of the material. This paper is the design and experimental testing of a feedback control system for the regulation of the volumetric flow in a polymer single screw extruder. Extruder temperature control is a challenging control problem. The problem becomes even more challenging when multiple barrel are included, such as in barrel temperature control for extruders. When characteristics of the system are examined, it becomes clear that a commonly used proportional plus compound plus derivative PID controller cannot meet such performance specifications for this kind of system. In order to achieve the required performance, a control strategy that utilizes techniques such as model predictive control, autotuning, and multiple parameter PID is formulated. This control strategy proves to be very effective in achieving the desired specifications.

Barrel temperature control for quality of thermoplastic polymers in the extrusion process

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Murat Mayda
Keyword(s):  
Temperature Control ◽  
Control Strategy ◽  
Controller Design ◽  
Experimental Testing ◽  
Design Procedure ◽  
Extrusion Process ◽  
Operating Conditions ◽  
Single Screw Extruder ◽  
Performance Specifications

In this paper, the design procedure; modeling and controller design, testing are presented. Extensive tests have shown that the system reacts rapidly to changes in the operating conditions and effectively rejects disturbances due to unexpected changes in the quality of the material. This paper is the design and experimental testing of a feedback control system for the regulation of the volumetric flow in a polymer single screw extruder. Extruder temperature control is a challenging control problem. The problem becomes even more challenging when multiple barrel are included, such as in barrel temperature control for extruders. When characteristics of the system are examined, it becomes clear that a commonly used proportional plus compound plus derivative PID controller cannot meet such performance specifications for this kind of system. In order to achieve the required performance, a control strategy that utilizes techniques such as model predictive control, autotuning, and multiple parameter PID is formulated. This control strategy proves to be very effective in achieving the desired specifications.

Barrel temperature control for quality of thermoplastic polymers in the extrusion process

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Murat Mayda
Keyword(s):  
Temperature Control ◽  
Control Strategy ◽  
Controller Design ◽  
Experimental Testing ◽  
Design Procedure ◽  
Extrusion Process ◽  
Operating Conditions ◽  
Single Screw Extruder ◽  
Performance Specifications

In this paper, the design procedure; modeling and controller design, testing are presented. Extensive tests have shown that the system reacts rapidly to changes in the operating conditions and effectively rejects disturbances due to unexpected changes in the quality of the material. This paper is the design and experimental testing of a feedback control system for the regulation of the volumetric flow in a polymer single screw extruder. Extruder temperature control is a challenging control problem. The problem becomes even more challenging when multiple barrel are included, such as in barrel temperature control for extruders. When characteristics of the system are examined, it becomes clear that a commonly used proportional plus compound plus derivative PID controller cannot meet such performance specifications for this kind of system. In order to achieve the required performance, a control strategy that utilizes techniques such as model predictive control, autotuning, and multiple parameter PID is formulated. This control strategy proves to be very effective in achieving the desired specifications.

scholarly journals A Novel Dissipativity-Based Control for Inexact Nonlinearity Cancellation Problems

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Giacomo Innocenti ◽  
Paolo Paoletti
Keyword(s):  
Control Strategy ◽  
Feedback Loop ◽  
Controller Design ◽  
Natural Control ◽  
Standard Methods ◽  
Approximation Quality ◽  
Linear Controller ◽  
Benchmark System ◽  
Global Linearization

When dealing with linear systems feedback interconnected with memoryless nonlinearities, a natural control strategy is making the overall dynamics linear at first and then designing a linear controller for the remaining linear dynamics. By canceling the original nonlinearity via a first feedback loop, global linearization can be achieved. However, when the controller is not capable of exactly canceling the nonlinearity, such control strategy may provide unsatisfactory performance or even induce instability. Here, the interplay between accuracy of nonlinearity approximation, quality of state estimation, and robustness of linear controller is investigated and explicit conditions for stability are derived. An alternative controller design based on such conditions is proposed and its effectiveness is compared with standard methods on a benchmark system.

The Effect of Screw Speed on Extrusion Quality of the Single-Screw Extruder

2014 ◽  
Vol 941-944 ◽  
pp. 1715-1719
Author(s):  
Yuan Lou Gao ◽  
Xin Wang ◽  
Li Zhou
Keyword(s):  
Extrusion Process ◽  
Screw Extruder ◽  
Screw Speed ◽  
Element Analysis ◽  
Outlet Pressure ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Multi Phase Flow ◽  
Multi Phase

This paper adopts the method of multi-phase flow to simulate the extrusion process of single-screw extruder based on different screw speed by using the finite element analysis software, and get the conclusion that the screw speed has a significant effect on the extrusion quality and outlet pressure of the single-screw extruder. With the increase of the screw speed, the extrusion quality of the single-screw extruder gets worse and the outlet pressure of the single-screw extruder increases.

Repetitive Controller Design in Parameter Space

2003 ◽  
Vol 125 (1) ◽  
pp. 134-138 ◽  
Author(s):  
Levent Gu¨venc¸
Keyword(s):  
Frequency Domain ◽  
Parameter Space ◽  
Controller Design ◽  
Design Method ◽  
Testing Machine ◽  
Design Procedure ◽  
Controller Parameter ◽  
Performance Specifications ◽  
Material Testing Machine ◽  
Repetitive Controller

A new and simple repetitive controller design procedure in controller parameter space, where the structure of the filters in the repetitive controller are fixed from the start and parameters within these filters are tuned, is presented here. This approach results in simple and physically meaningful controllers that are easily implementable. The design method is based on mapping frequency domain performance specifications into a chosen plane of controller parameters. Sensitivity function magnitude bounds and a relative stability measure are chosen as the frequency domain specifications to be mapped into controller parameter space here. The design method is illustrated numerically in the context of a servohydraulic material testing machine application available in the literature.

scholarly journals Changes in physical properties of extruded sour cassava starch and quinoa flour blend snacks

2012 ◽  
Vol 32 (4) ◽  
pp. 826-834 ◽  
Author(s):  
Lívia Giolo Taverna ◽  
Magali Leonel ◽  
Martha Maria Mischan
Keyword(s):  
Physical Properties ◽  
Water Solubility ◽  
Extrusion Process ◽  
Cassava Starch ◽  
Raw Material ◽  
Pronounced Increase ◽  
Single Screw Extruder ◽  
Good Potential ◽  
Quinoa Flour

Given the broad acceptance of sour cassava starch biscuits in Brazil and the nutritional quality of quinoa flour, this study aimed to evaluate the effect of extrusion temperature, screw speed, moisture, and amount of quinoa flour on the physical properties of puffed snacks. Extrusion process was carried out using a single-screw extruder in a factorial central composite design with four factors. Effects of moisture and amount of quinoa flour on the expansion index and specific volume of snacks were observed. There was a pronounced increase in water solubility index of blends with the extrusion process with significant effects of all process parameters on the WSI. Higher water absorption index (WAI) was observed under high temperature, low moisture, and lower quinoa flour amount. Temperature and amount of quinoa flour influenced the color of the snacks. A positive quadratic effect of quinoa flour on hardness of products was observed. Blends of sour cassava starch and quinoa flour have good potential for use as raw material in production of extruded snacks with good physical properties.

A New Structured Multimodel Control of Nonlinear Systems by Integrating Stability Margin and Performance

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Mahdi Ahmadi ◽  
Mohammad Haeri
Keyword(s):  
Nonlinear Systems ◽  
Controller Design ◽  
A Priori ◽  
Design Procedure ◽  
Stability Margin ◽  
Point Tracking ◽  
Performance Requirements ◽  
Performance Specifications ◽  
And Performance ◽  
Model Redundancy

This paper deals with a new systematic multimodel controller design for nonlinear systems. The design of local controllers based on performance requirements is incorporated with the concept of local models selection as an optimization problem. Gap metric and stability margin are used as measuring tool and operation space dividing criterion, respectively. The developed method provides support to design a simple structured multiple proportional-integral (PI) controller which guarantees both robust stability and time-domain performance specifications. The main advantages of the proposed method are avoiding model redundancy, not needing a priori knowledge about system, having simple structure, and easing the implementation. To evaluate the presented multimodel controller design procedure, three benchmark nonlinear systems are studied. Both simulations and experimental results prove the effectiveness of the proposed method in set point tracking and disturbance rejection.

Robust Repetitive Controller Design in Parameter Space

2005 ◽  
Vol 128 (2) ◽  
pp. 406-413 ◽  
Author(s):  
Bilin Aksun Güvenç ◽  
Levent Güvenç
Keyword(s):  
Frequency Domain ◽  
Parameter Space ◽  
Controller Design ◽  
Design Method ◽  
Testing Machine ◽  
Design Procedure ◽  
Controller Parameter ◽  
Performance Specifications ◽  
Nominal Performance ◽  
Repetitive Controller

A new and simple robust repetitive controller design procedure in controller parameter space is presented here. The structure of the repetitive controller filters are fixed, thus, simplifying the design procedure to tuning of the fixed structure filters’ parameters. This approach results in simple and physically meaningful robust controllers that are easily implementable. The design method is based on mapping frequency domain performance specifications into a chosen controller parameter plane. Weighted sensitivity (nominal performance) and weighted complementary sensitivity (robust stability) function magnitude bounds are chosen as the frequency domain specifications to be mapped into controller parameter space here. The design method is illustrated numerically in the context of a servohydraulic material testing machine application available in the literature.

An Adaptively Controlled Electrohydraulic Servo-Mechanism: Part 2: Implementation

1987 ◽  
Vol 201 (3) ◽  
pp. 181-189 ◽  
Author(s):  
K A Edge ◽  
K R A Figueredo
Keyword(s):  
Controller Design ◽  
Design Method ◽  
Design Procedure ◽  
Adaptive Controller ◽  
Operating Conditions ◽  
Experimental Results ◽  
Design Parameters ◽  
Model Following ◽  
Servo Mechanism ◽  
Electrohydraulic Servo System

An adaptive controller design procedure has been applied to an electrohydraulic servo-system. Detailed accounts are provided on applying the design method and on initializing the controller free design parameters. Experimental results demonstrate the ability of the adaptive controller to maintain consistently good model following behaviour under changing operating conditions.

The Educational Impact of a Gantry Crane Project in an Undergraduate Controls Class

2002 ◽  
Author(s):  
Michael C. Reynolds ◽  
Peter H. Meckl ◽  
Bin Yao
Keyword(s):  
Controller Design ◽  
Gantry Crane ◽  
Great Effort ◽  
Educational Impact ◽  
Student Teams ◽  
Point Motion ◽  
Performance Specifications ◽  
Point To Point ◽  
And Control

In the fall of 2001 we implemented a new controller design project in our Junior/Senior level controls class in Mechanical Engineering at Purdue University. The old project, which involved the identification and control of a “black box”, failed to challenge and motivate students. Our new project is the design of a controller for the point-to-point motion of a gantry crane system. Student teams modeled the gantry crane and developed a controller to meet several performance specifications. The designs were implemented in Simulink with MATLAB’s Real-Time Workshop. A competition served to further motivate the students. In the end we were very impressed with the great effort the students gave and the quality of their designs. Each group presented their design and most students stayed and asked questions for several hours.

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