A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Control of smart traversing beam
Shape memory NIckel-TItanium alloy (NITINOL) is utilized in developing SMART traversing beams for use in critical applications where weight and deflection are of outmost importance such as the launching and crossing operations of long support bridges. The NITINOL fibers are placed at critical locations inside the traversing beams to sense and control the beam deflection. With such capabilities, it would be possible to manufacture light weight and long span support bridges which can be easily handled in short emplacement time. A finite element model is developed to describe the static characteristics of a thin-walled square cross section cantilever beam subjected to concentrated moving loads. The model accounts for the control action provided by the phase recovery forces generated by the NITINOL fibers due to their activation by the control system. A closed-loop computer-controlled prototype of the SMART beam is built to demonstrate the feasibility of the concept. The sides of the prototype beam are made of photoelastic plates in order to monitor the stress distribution in the beam with and without the activation of the NITINOL fibers. The experimental stress distribution and beam deflection are found to be in good agreement with the predictions of the finite element model. The results obtained successfully demonstrate the effectiveness of the NITINOL fibers in sensing and controlling the deflection of this class of SMART beams.
Control of smart traversing beam
Shape memory NIckel-TItanium alloy (NITINOL) is utilized in developing SMART traversing beams for use in critical applications where weight and deflection are of outmost importance such as the launching and crossing operations of long support bridges. The NITINOL fibers are placed at critical locations inside the traversing beams to sense and control the beam deflection. With such capabilities, it would be possible to manufacture light weight and long span support bridges which can be easily handled in short emplacement time. A finite element model is developed to describe the static characteristics of a thin-walled square cross section cantilever beam subjected to concentrated moving loads. The model accounts for the control action provided by the phase recovery forces generated by the NITINOL fibers due to their activation by the control system. A closed-loop computer-controlled prototype of the SMART beam is built to demonstrate the feasibility of the concept. The sides of the prototype beam are made of photoelastic plates in order to monitor the stress distribution in the beam with and without the activation of the NITINOL fibers. The experimental stress distribution and beam deflection are found to be in good agreement with the predictions of the finite element model. The results obtained successfully demonstrate the effectiveness of the NITINOL fibers in sensing and controlling the deflection of this class of SMART beams.
Control of smart traversing beam
Steuerung von intelligenten Querträgern
Baz, A. (author) / Ro, J. (author) / Poh, S. (author) / Gilheany, J. (author)
1992
10 Seiten, 10 Bilder, 9 Quellen
Conference paper
English
Solving Control Reference Azimuth Problems of Traversing Using Reorientation Traversing
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