Adaptive Control for Safe and Quality Rebar Fabrication
Publication: Journal of Construction Engineering and Management
Volume 126, Issue 2
Abstract
Rebar fabrication is a labor intensive operation that uses scrap or “trash” steel for raw materials and therefore can benefit greatly from improvements in safety, productivity, and quality. Shared control through a human-machine interface may be the best alternative for achieving highest quality standards and improving worker performance in safety and productivity. This paper develops a control scheme for automated rebar bending within the framework of computer integrated construction and presents research focused on the task level control to compensate for springback in the bent rebar. Three major problems are addressed: (1) Conception of a hierarchical computer integrated construction control structure that links rebar fabrication to the other construction project functions: (2) comparative evaluation of alternative algorithms for prediction of springback; and (3) portability of a springback control model that uses real-time electronic sensing. Bending tests were conducted with both a laboratory prototype and an actual shop table bender to experiment with alternative models for in-process springback prediction including a neural network model. Limitations in control system portability were realized in the transfer from the laboratory prototype bender to the shop bender. Springback model evaluations revealed that empirical statistical models, neural networks, and in-process relaxation performed equally well.
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References
1.
Abraham, D. M. ( 1990). “A state-based framework using indicators for construction monitoring and evaluation,” PhD dissertation, University of Maryland, College Park, Md.
2.
Albus, J. S., Barbera, A. J., and Nagel, R. N. (1981). “Theory and practice of hierarchical control.” Proc., 23rd IEEE Comp. Soc. Int. Conf., IEEE, New York, 18–39.
3.
Annaswamy, A. M., and Seto, D. (1991). “Manipulation of compliant objects with compliant fingerpads in the presence of nonlinear dynamics.” Proc., IEEE Conf. on Decision and Control, IEEE, Piscataway, N.J., 2124–2129.
4.
Basnet, C., and Mize, J. H. (1994). “Scheduling and control of flexible manufacturing systems: A critical review.” Int. J. Comp. Integrated Manufacturing, Taylor & Francis Ltd., London, 7(6), 340–355.
5.
Bernold, L. E., Abraham, D. M., and Livingston, E. E. (1989). “Emulation for control system analysis in automated construction.”J. Comp. in Civ. Engrg., ASCE, 3(4), 320–332.
6.
Bernold, L. E., and Salim, Md. (1993). “Placement-oriented design and delivery of concrete reinforcement.”J. Constr. Engrg. and Mgmt., ASCE, 119(2), 323–335.
7.
CRSI. (1992). “The 1992 CRSI shop production statistics survey.” Annu. Rep., Concrete Reinforcing Steel Institute, Schaumburg, Ill.
8.
Deichmann, U. (1991). “Automatic link benders–advancements.” Betonwerk und Fertigteil-Technik, Germany, 57(2), 67–69.
9.
DMI standard bender operations and maintenance instruction manual. (1993). KRB Machinery Co., York, Pa.
10.
Dunston, P. S. ( 1994). “Control structures for the automated bending of steel reinforcing bars,” PhD dissertation, North Carolina State University, Raleigh, N.C.
11.
Dunston, P. S., and Bernold, L. E. ( 1993). “Intelligent control for robotic rebar bending.” Automation and robotics in construction X, G. H. Watson, R. L. Tucker, and J. K. Walters, eds., Elsevier, New York, 101–108.
12.
Dunston, P. S., and Bernold, L. E. (1994a). “Adaptive control for robotic rebar bending.” Microcomputers in Civ. Engrg., Oxford, England, 9, 53–60.
13.
Dunston, P. S., and Bernold, L. E. ( 1994b). “Real-time control for a robotic rebar bender.” Robotics for challenging environments, L. A. Demsetz and P. R. Klarer, eds., ASCE, New York, 392–400.
14.
Dunston, P. S., Ranjithan, S., and Bernold, L. E. (1996). “Neural network model for automated control of springback in rebars.” IEEE Expert: Intelligent Sys. and their Applications, 11(4), 45–49.
15.
“Electronically controlled straightening and cutting machine for reinforcing steel from the coil.” (1993). Product specification brochure for the Fil-RA 100 S, Filzmoser Maschinenbau, Austria.
16.
Fukuhara, N. ( 1991). “CIM state of the art in Japan.” Computer applications in production and engineering: Integration aspects, G. Doumeingts, J. Browne, and M. Tomljanovich, eds., Elsevier Science, Amsterdam, 15–22.
17.
Gardiner, F. J. (1957). “The spring back of metals.” Trans. ASME, 79(1), 1–9.
18.
Gershwin, S. B., Hildebrant, R. K., Suri, R. R., and Mitter, S. K. (1986). “A control perspective on recent trends in manufacturing systems.” IEEE Control Sys. Mag., 6, 3–15.
19.
Gupta, D., and Buzacott, J. A. (1989). “A framework for understanding flexibility of manufacturing systems.” J. Manufacturing Sys., 8(2), 89–96.
20.
Hardt, D. E., Roberts, M. A., and Stelson, K. A. (1982). “Closed-loop shape control of a roll-bending process.” Proc., Winter Annu. Meeting of the Am. Soc. of Mech. Engrs., Measurement and Control for Batch Manufacturing, D. E. Hardt, ed., ASME, New York, 17–29.
21.
Hogan, N. (1985). “Impedance control: An approach to manipulation.” Trans. ASME, J. Dynamic Sys., Measurement, and Control, 107(1), 1–24.
22.
Hosford, W. F., and Caddell, R. M. (1983). Metal forming. Prentice-Hall, Englewood Cliffs, N.J.
23.
Klein, R. (1990). “Bending operations in the concrete plant.” Betonwerk und Fertigteil-Technik, Germany 56(2), 39–46.
24.
Kusiak, A. (1990). Intelligent manufacturing systems. Prentice-Hall, Englewood Cliffs, N.J.
25.
Lardner, T. J., ed. (1972). An introduction to the mechanics of solids, 2nd Ed., McGraw-Hill, New York.
26.
Lasky, T. A., and Hsia, T. C. (1991). “On force-tracking impedance control of robot manipulator.” Proc., 1991 IEEE Int. Conf. on Robotics and Automation, Vol. 1, IEEE, Piscataway, N.J., 274–280.
27.
Levy, B. S. (1984). “Empirically derived equations for predicting springback in bending.” J. Appl. Metalworking, 3(2), 135–141.
28.
Liu, G. J., and Goldenberg, A. A. (1991). “Robust hybrid impedance control of robot manipulators.” Proc., 1991 IEEE Int. Conf. on Robotics and Automation, Vol. 1, IEEE, Piscataway, N.J., 287–292.
29.
Loders, T. (1992). “Reinforcement technology for concrete and precast concrete works.” Betonwerk und Fertigteil-Technik, Germany 58(9), 55–59.
30.
Luger, G. F., and Stubblefield, W. A. (1989). Artificial intelligence and the design of expert systems, Benjamin-Cummings, Redwood City, Calif.
31.
Manual of standard practice. (1990). 25th Ed., MSP-1-90, Com. on Engrg. Pract., Concrete Reinforcing Steel Institute, Schaumburg, Ill.
32.
Miltenberger, M. A., and Bernold, L. E. (1991). “CAD-integrated rebar bending.” Proc., 7th Conf., Computing in Civ. Engrg. and Symp. on Data Bases, L. F. Cohn and W. Rasdorf, eds., ASCE, New York, 819–828.
33.
Miyatake, Y., and Kangari, R. (1993). “Experiencing computer integrated construction.”J. Constr. Engrg. and Mgmt., ASCE, 119(2), 307–322.
34.
Navon, R., Rubinovitz, Y., and Coffler, M. (1995). “RCCS: Rebar CAD/CAM system.” Microcomputers in Civ. Engrg., Oxford, England, 10, 397–412.
35.
Navon, R., Rubinovitz, Y., and Coffler, M. (1996). “Fully automated rebar CAD/CAM system: Economic evaluation and field implementation.”J. Constr. Engrg. and Mgmt., ASCE, 122(2), 101–108.
36.
“NC tube bending for the Navy's new weapons system.” (1965). The Tool and Manufacturing Engr., 54(4), 48.
37.
Nicholson, R. J. ( 1965). “Numerically controlled tube bending.” Technical Paper No. 659, SME (formerly ASTME), Dearborn, Mich.
38.
Olling, G. J. ( 1991). “CIM status and direction in the U.S.A.” Computer applications in production and engineering: Integration aspects, G. Doumeingts, J. Browne, and M. Tomljanovich, eds., Elsevier Science, Amsterdam, 33–40.
39.
Pearce, R. (1991). Sheet metal forming. IOP Publishing, New York.
40.
Pond, R. J. (1994). Fundamentals of statistical quality control. Macmillan, New York.
41.
“Precision tube bending with numerical control.” (1963). Tooling and Production, 29(4), 48–49.
42.
Raibert, M. H., and Craig, J. J. (1981). “Hybrid position/force control of manipulators.” Trans. ASME, J. Dyn. Sys., Measurement, and Control, 102(2), 126–133.
43.
Rojas, E. M., and Songer, A. D. (1999). “Web-centric systems: A new paradigm for collaborative engineering.”J. Mgmt. in Engrg., ASCE, 15(1), 39–45.
44.
Rosen, C. A., and Nitzan, D. (1977). “Use of sensors in programmable automation.” Comp., 10(12), 12–23.
45.
Rucker, W., and Piciacchia, R. (1993). “Focus on technology.” Constr. Business Rev., 3(6), 54–57.
46.
Salim, Md., and Bernold, L. E. (1992). “AI supported process planning for automated rebar fabrication.” Proc., 8th Conf. on Comp. in Civ. Engrg., ASCE, New York, 872–879.
47.
Salim, Md., and Bernold, L. E. (1994). “Effects of design-integrated process planning on productivity in rebar placement.”J. Constr. Engrg. and Mgmt., ASCE, 120(4), 720–738.
48.
Shimano, B. E., Geschke, C. C., and Spalding, C. H., III. (1984). “VAL-II: A new robot control system for automatic manufacturing.” Proc., Int. Conf. on Robotics, IEEE, Piscataway, N.J., 278–292.
49.
“Standard specifications for tolerances for concrete construction and materials.” (1990). ACI 117-90, American Concrete Institute, Detroit.
50.
“Standard specification for deformed and plain billet-steel bars for concrete reinforcement.” (1994). A 615-93, ASTM, West Conshohocken, Pa.
51.
Stelson, K. A., and Gossard, D. C. (1982). “An adaptive pressbrake control using an elastic-plastic material model.” J. Engrg. for Industry, 104(4), 389–393.
52.
Strasser, F. (1962). “Correcting for springback in sheet metal bending: Sound design principle.” Des. Engrg., January, 22–25.
53.
Sturm, R. G., and Fletcher, B. J. (1941). “Determining springback—Calculating die radius to bend desired curve.” Product Engrg., 12, 526–528, 590–594.
54.
Taylor, J. G. (1993). The promise of neural networks. Springer, New York.
55.
Weiss, S. M., and Kulikowksi, C. A. (1991). Computer systems that learn: Classification and prediction methods from statistics, neural nets, machine learning, and expert systems. Morgan Kaufmann Publishers Inc., San Mateo, Calif.
56.
Wieser, P. F., ed. (1980). Steel castings handbook, 5th Ed., Steel Founders' Society of America (SFSA), Rocky River, Ohio.
57.
Zhang, H., and Mallur, S. (1994). “An integrated model of process planning and production scheduling.” Int. J. Comp. Integrated Manufacturing, Taylor & Francis Ltd., London, 7(6), 356–364.
Information & Authors
Information
Published In
Journal of Construction Engineering and Management
Volume 126 • Issue 2 • March 2000
Pages: 122 - 129
History
Received: Mar 10, 1999
Published online: Mar 1, 2000
Published in print: Mar 2000
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