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RISS 인기검색어
- 검색키워드
- 저자 : Mariacristina Spizzuoco (검색결과 3 건)
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Experimental analysis of a semi-actively controlled steel building
Antonio Occhiuzzi,Mariacristina Spizzuoco 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6
The strong need of verifying theories formulated for semi-active control through applicationsto real structures is due to the fact that theoretical research on semi-active control systems is not matchedby a corresponding satisfactory experimental activity. This paper shows how a smart system includingmagnetorheological devices as damping elements can be implemented in a large-scale structural model, bydescribing in detail the kind of electronics (dedicated hardware and software) adopted during theresponse (either experimental or numerical) of the semi-actively controlled structure compared to a passiveoperating control system, and in terms of the evaluation criteria proposed in the benchmark forseismically excited controlled buildings. The paper also explains how to derive from the classical theoryexhaustive picture of the time delays characterizing the control sequence.
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Experimental analysis of a semi-actively controlled steel building
Occhiuzzi, Antonio,Spizzuoco, Mariacristina Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6
The strong need of verifying theories formulated for semi-active control through applications to real structures is due to the fact that theoretical research on semi-active control systems is not matched by a corresponding satisfactory experimental activity. This paper shows how a smart system including magnetorheological devices as damping elements can be implemented in a large-scale structural model, by describing in detail the kind of electronics (dedicated hardware and software) adopted during the experimental campaign. It also describes the most interesting results in terms of reduction of the seismic response (either experimental or numerical) of the semi-actively controlled structure compared to a passive operating control system, and in terms of the evaluation criteria proposed in the benchmark for seismically excited controlled buildings. The paper also explains how to derive from the classical theory of optimal control the adopted control logic, based on a clear physical approach, and provides an exhaustive picture of the time delays characterizing the control sequence.
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Nicola Caterino,Christos T. Georgakis,Mariacristina Spizzuoco,Antonio Occhiuzzi 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.18 No.1
The design of a semi-active (SA) control system addressed to mitigate wind induced structural demand to high wind turbine towers is discussed herein. Actually, the remarkable growth in height of wind turbines in the last decades, for a higher production of electricity, makes this issue pressing than ever. The main objective is limiting bending moment demand by relaxing the base restraint, without increasing the top displacement, so reducing the incidence of harmful \"p-delta\" effects. A variable restraint at the base, able to modify in real time its mechanical properties according to the instantaneous response of the tower, is proposed. It is made of a smooth hinge with additional elastic stiffness and variable damping respectively given by springs and SA magnetorheological (MR) dampers installed in parallel. The idea has been physically realized at the Denmark Technical University where a 1/20 scale model of a real, one hundred meters tall wind turbine has been assumed as case study for shaking table tests. A special control algorithm has been purposely designed to drive MR dampers. Starting from the results of preliminary laboratory tests, a finite element model of such structure has been calibrated so as to develop several numerical simulations addressed to calibrate the controller, i.e., to achieve as much as possible different, even conflicting, structural goals. The results are definitely encouraging, since the best configuration of the controller leaded to about 80% of reduction of base stress, as well as to about 30% of reduction of top displacement in respect to the fixed base case.
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