A Control Strategy for Intelligent Stamp Forming Tooling

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
William J. Emblom ◽  
Klaus J. Weinmann
Keyword(s):  
Fuzzy Logic ◽  
Control Systems ◽  
Control Strategy ◽  
Pid Controller ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Linear Quadratic ◽  
Blank Holder ◽  
Loop Control ◽  
Stamp Forming

This paper describes the development and implementation of closed-loop control for oval stamp forming tooling using MATLAB®’s SIMULINK® and the dSPACE®CONTROLDESK®. A traditional PID controller was used for the blank holder pressure and an advanced controller utilizing fuzzy logic combining a linear quadratic gauss controller and a bang–bang controller was used to control draw bead position. The draw beads were used to control local forces near the draw beads. The blank holder pressures were used to control both wrinkling and local forces during forming. It was shown that a complex, advanced controller could be modeled using MATLAB’s SIMULINK and implemented in DSPACE CONTROLDESK. The resulting control systems for blank holder pressures and draw beads were used to control simultaneously local punch forces and wrinkling during the forming operation thereby resulting in a complex control strategy that could be used to improve the robustness of the stamp forming processes.

The Development of a Complex Control Methodology for an Intelligent Stamp Forming Die

2010 ◽  
Author(s):  
William J. Emblom ◽  
Klaus J. Weinmann
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Linear Quadratic ◽  
Blank Holder ◽  
Loop Control ◽  
Complex Control ◽  
Stamp Forming ◽  
Control Methodology

This paper describes the development and implementation of closed-loop control for an oval stamp forming die using Matlab®’s Simulink® and the dSPACE® ControlDesk®. A traditional PID controller was used for the blank holder pressure and an advanced controller utilizing fuzzy logic combining a Linear Quadratic Gauss controller and a Bang-Bang controller. The draw beads were used to control local forces near the draw beads. The blank holder pressures were used to control both wrinkling and local forces during forces. It was demonstrated that a complex, advanced controller could be modeled using Matlab’s Simulink and implemented in dSPACE ControlDesk. The resulting control systems for blank holder pressures and draw beads were used to control simultaneously local punch forces and wrinkling during the forming operation resulting in a complex control strategy that could be used to improve the robustness of stamp forming dies.

Stabilization of Load’s Position in Offshore Cranes

2011 ◽  
Vol 134 (2) ◽  
Author(s):  
A. Maczyński ◽  
S. Wojciech
Keyword(s):  
Fixed Point ◽  
Control Systems ◽  
Pid Controller ◽  
Closed Loop ◽  
Auxiliary System ◽  
Simplified Model ◽  
Closed Loop Control ◽  
Loop Control ◽  
Sophisticated Model ◽  
Offshore Crane

It is often desirable to keep the load of an offshore crane in a fixed point in space despite the movement of its base. To solve the problem of stabilizing the load’s position, the authors have proposed application of the hoisting winch drum’s drive and an auxiliary system. The auxiliary system enables independent moving of a selected point of the hoisting rope in two perpendicular planes. In this paper, two methods for determining the drive functions of the auxiliary system and the hoisting winch’s drum ensuring stabilization of an offshore crane’s load are presented. Both methods are based on a simplified model of a crane and allow compensation for a pseudo-harmonic base motion. In order to take into account the deviations of base motion from the assumed and avoid over simplifications, the second, more sophisticated model is developed. This model is proposed to be applied in closed-loop control systems with a PID controller. Results of sample numerical simulations are included that proved useful information about the developed methods and models for stabilization of an offshore crane’s load.

scholarly journals Changeover Process Assessment of Warp-Knitting Let-Off Equipped with Multispeed Electronic Let-Off System

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yong Ji ◽  
Gaoming Jiang ◽  
Mengting Tang
Keyword(s):  
Control Systems ◽  
Control Strategy ◽  
Closed Loop ◽  
Acoustic Vibration ◽  
Closed Loop Control ◽  
Knitted Fabrics ◽  
Loop Control ◽  
Warp Tension ◽  
Digital Manufacture ◽  
New Framework

AbstractWarp-knitted fabrics have gained increasing attention due to their excellent properties, and their production is strongly dependent on the warp-based electronic let-off system. Most of the existing control systems are single speed electron let-off structure, which brings a series of issues such as broken yarn, missed needle, and running thread caused by let-off delay, making it hard for manufacturer to produce the required fabrics. To fill the gap, this article proposes a new framework of a multispeed electronic let-off system for warp knitting based on closed-loop control strategy. As a demonstration of the capacity and generalizability of this newly proposed methodology, the 01-type four-channel acoustic vibration analyzer is used to test and analyze the time of switching, the let-off amounts, and the change in warp tension during the process of switching let-off amounts, including the explanation and comparison of difference values of let-off quantities. It is shown that the proposed method for the production of warp-knitted fabrics is a useful method for achieving digital manufacture of warp-knitted fabrics.

Robustness for Intelligent Tooling While Forming Shallow Aluminum Pans

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
William J. Emblom
Keyword(s):  
Control System ◽  
Design Process ◽  
Closed Loop ◽  
Open Loop ◽  
Closed Loop Control ◽  
Blank Holder ◽  
Loop Control ◽  
Stamp Forming ◽  
Tooling Design ◽  
Process Disturbances

This study examines the robustness of stamp forming tooling. An oval pan was formed using tooling that included a flexible blank holder, active draw beads, and closed-loop control of both wrinkling and local punch forces. The results were compared to open-loop tests using the same tooling and earlier work that utilized tooling that produced similar pans but included a rigid blank holder. For the current study, robustness was defined as the ability to delay wrinkling or tearing. A description of the tooling design process is provided as well as a synopsis of the development of the control system for the tooling. Open-loop and closed-control tests using AL 6111-T4 blanks were performed in order to evaluate the ability to reject process disturbances and demonstrate improved robustness of the tooling. During open-loop tests, the current tooling was shown to be more robust than the earlier tooling with the rigid blank holder. Control of wrinkling eliminated one form of part failure while closed-loop control of local punch forces significantly improved the robustness of the tooling by delaying tearing.

On Passive Implementation of Feedback Control Systems

1989 ◽  
Vol 111 (2) ◽  
pp. 339-342
Author(s):  
R. Shoureshi
Keyword(s):  
Feedback Control ◽  
Control Systems ◽  
State Feedback ◽  
Closed Loop ◽  
State Feedback Control ◽  
Closed Loop Control ◽  
Linear Quadratic ◽  
Loop Control ◽  
Feedback Control Systems ◽  
Linear Quadratic Regulators

Closed-loop control systems, especially linear quadratic regulators (LQR), require feedbacks of all states. This requirement may not be feasible for those systems which have limitations due to geometry, power, required sensors, size, and cost. To overcome such requirements a passive method for implementation of state feedback control systems is presented.

Improved Robustness Through Closed-Loop Control for Aluminum Sheet Metal Stamp Forming

2008 ◽  
Author(s):  
William J. Emblom ◽  
Klaus J. Weinmann
Keyword(s):  
Closed Loop ◽  
Experimental Tests ◽  
Open Loop ◽  
Closed Loop Control ◽  
Punch Force ◽  
Blank Holder ◽  
Loop Control ◽  
Stamp Forming ◽  
Process Disturbances ◽  
Bead Height

A stamp forming die, whose flexible blank holder was designed using FEA, was built. Tests were performed to evaluate the robustness of the die once closed-loop control was implemented. These results were compared to the results of open-loop tests presented earlier. The closed-loop tests were designed to determine the die and control system’s ability to reject process disturbances and demonstrate improved robustness in stamp forming when using a flexible blank holder and closed-loop control. Draw beads were used to control local punch forces and blank holder forces were used to control wrinkling. Experimental tests for the die demonstrated that closed-loop control of local punch forces using active draw beads improves robustness of the die. Two different lubricants and varying quantities of lubricant were evaluated for this study. Additionally, the ability to simultaneously use draw bead height to control local punch force and blank holder force to control wrinkles was demonstrated.

Type-III closed loop control systems-Digital PID controller design

2013 ◽  
Vol 23 (10) ◽  
pp. 1401-1414 ◽  
Author(s):  
Konstantinos G. Papadopoulos ◽  
Nikolaos D. Tselepis ◽  
Nikolaos I. Margaris
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Closed Loop ◽  
Controller Design ◽  
Closed Loop Control ◽  
Loop Control ◽  
Type Iii ◽  
Digital Pid ◽  
Pid Controller Design

EEG-FES-Force-MMG closed-loop control systems of a volunteer with paraplegia considering motor imagery with fatigue recognition and automatic shut-off

2021 ◽  
Vol 68 ◽  
pp. 102662
Author(s):  
Paulo Broniera Junior ◽  
Daniel Prado Campos ◽  
André Eugenio Lazzaretti ◽  
Percy Nohama ◽  
Aparecido Augusto Carvalho ◽  
...  
Keyword(s):  
Control Systems ◽  
Motor Imagery ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control
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