Closed-loop, Fieldbus-based Clock Synchronisation for Decentralised Control Systems

Reset controllers consist of two parts—a linear compensator and a reset element. The linear compensator is designed, in the usual ways, to meet all closed-loop performance specifications while relaxing the overshoot constraint. Then, the reset element is chosen to meet this remaining step-response specification. In this paper, we consider the case when such linear compensation results in a second-order (loop) transfer function and where a first-order reset element (FORE) is employed. We analyze the closed-loop reset control system addressing performance issues such as stability, steady-state response, and transient performance.

Download Full-text

Linear Control Root-Clustering of Uncertain Systems

Volume 2: Dynamics, Vibration and Control; Energy; Fluids Engineering; Micro and Nano Manufacturing ◽

10.1115/esda2014-20340 ◽

2014 ◽

Author(s):

S. Gutman

Keyword(s):

Control Systems ◽

Uncertain Systems ◽

Closed Loop ◽

Linear Control ◽

Linear Control Systems ◽

Linear Feedback ◽

Important Class ◽

Linear Feedback Control ◽

Control Root ◽

Clustering Criterion

In the design of linear control systems, it is desired to assign the closed loop spectrum in sub-regions (as opposed to locations) of the complex plane. The present paper establishes a matrix root-clustering criterion for an important class of regions, and develops a linear feedback control that assigns the closed loop spectrum in the desired region. This is done for both nominal and uncertain systems.

Download Full-text

A Control Strategy for Intelligent Stamp Forming Tooling

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4005310 ◽

2011 ◽

Vol 133 (6) ◽

Cited By ~ 3

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.

Download Full-text