General Scheme for Automatic Control of Continuous Bending of Beams

[+] Author and Article Information
E. Trostmann

Control Engineering Laboratory, Technical University of Denmark, DK 2800 Lynby, Denmark

N. E. Hansen

Institute for Product Development, Technical University of Denmark, DK 2800 Lynby, Denmark

G. Cook

Department of Electrical and Biomedical Engineering, Vanderbilt University, Nashville, Tenn. 37235

J. Dyn. Sys., Meas., Control 104(2), 173-179 (Jun 01, 1982) (7 pages) doi:10.1115/1.3139693 History: Received March 28, 1980; Online July 21, 2009


The paper addresses the problem of automating the process of continuous bending of metal beams. The history of previous efforts along these lines is presented and a comparison of this problem with that of numerical control in metal cutting is made. A mathematical model of the bending process suitable for a control system is presented. The uncertainties due to springback and the stochastic nature of bending properties of the beam material are discussed. The needs for parameter identification and output prediction are described. A block diagram for a closed-loop system to control this process is introduced. Results are presented which demonstrate that it is possible to bend to desired curvature if the springback characteristics are known. It is concluded that automatic control of this process is feasible making possible continuous bending of beams into arbitrary desired shapes.

Copyright © 1982 by ASME
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