A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Active control of cable structures
In recent years, cable structures have had spectacular applications in large cable-stayed bridges. However, cable and deck vibrations have become a major design issue, because the ever increasing span of the bridges makes them more sensitive to flutter instability as well as to wind and traffic induced vibrations. This justifies the development of active damping devices for future large bridges. This paper presents a strategy for active damping of cable structures, using active tendons. The first part of the paper summarizes the theoretical background: the control law is briefly presented together with the main results of an approximate linear theory, which allows to predict the closed-loop poles with a root-locus technique. Various experiments have been successfully performed with small size mock-ups representative of future large space trusses equipped with piezoelectric actuators; a large-scale experiments has been performed on a cable-stayed bridge mock-up equipped with hydraulic actuators, in the framework of a collaborative research effort sponsored by the European Union; all these tests have confirmed the remarkable stability and efficacy of the proposed approach, and helped to identify technological issues. Next, experimental results obtained with structures representative of cable-stayed bridges are examined: a small size mock-up representative of a cable-stayed bridge during the construction phase is first considered, followed by a 30m long mock-up using hydraulic actuators.
Active control of cable structures
In recent years, cable structures have had spectacular applications in large cable-stayed bridges. However, cable and deck vibrations have become a major design issue, because the ever increasing span of the bridges makes them more sensitive to flutter instability as well as to wind and traffic induced vibrations. This justifies the development of active damping devices for future large bridges. This paper presents a strategy for active damping of cable structures, using active tendons. The first part of the paper summarizes the theoretical background: the control law is briefly presented together with the main results of an approximate linear theory, which allows to predict the closed-loop poles with a root-locus technique. Various experiments have been successfully performed with small size mock-ups representative of future large space trusses equipped with piezoelectric actuators; a large-scale experiments has been performed on a cable-stayed bridge mock-up equipped with hydraulic actuators, in the framework of a collaborative research effort sponsored by the European Union; all these tests have confirmed the remarkable stability and efficacy of the proposed approach, and helped to identify technological issues. Next, experimental results obtained with structures representative of cable-stayed bridges are examined: a small size mock-up representative of a cable-stayed bridge during the construction phase is first considered, followed by a 30m long mock-up using hydraulic actuators.
Active control of cable structures
Aktive Schwingungsregelung für Kabelsysteme im Brückenbau
Preumont, A. (author) / Bossens, F. (author)
2002
24 Seiten, 29 Bilder, 28 Quellen
Conference paper
English
Active control of cable and cable-structure system
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