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http://dx.doi.org/10.12989/sem.2013.46.2.153

Hybrid nonlinear control of a tall tower with a pendulum absorber  

Orlando, Diego (Department of Civil Engineering, Pontifical Catholic University of Rio de Janeiro)
Goncalves, Paulo B. (Department of Civil Engineering, Pontifical Catholic University of Rio de Janeiro)
Publication Information
Structural Engineering and Mechanics / v.46, no.2, 2013 , pp. 153-177 More about this Journal
Abstract
Pendulums can be used as passive vibration control devices in several structures and machines. In the present work, the nonlinear behavior of a pendulum-tower system is studied. The tower is modeled as a bar with variable cross-section with concentrated masses. First, the vibration modes and frequencies of the tower are obtained analytically. The primary structure and absorber together constitute a coupled system which is discretized as a two degrees of freedom nonlinear system, using the normalized eigenfunctions and the Rayleigh-Ritz method. The analysis shows the influence of the geometric nonlinearity of the pendulum absorber on the response of the tower. A parametric analysis also shows that, with an appropriate choice of the absorber parameters, a pendulum can decrease the vibration amplitudes of the tower in the main resonance region. The results also show that the pendulum nonlinearity cannot be neglected in this type of problem, leading to multiplicity of solutions, dynamic jumps and instability. In order to improve the effectiveness of the control during the transient response, a hybrid control system is suggested. The added control force is implemented as a non-linear variable stiffness device based on position and velocity feedback. The obtained results show that this strategy of nonlinear control is attractive, has a good potential and can be used to minimize the response of slender structures under various types of excitation.
Keywords
tower; nonlinear oscillations; passive control; pendulum absorber; hybrid control; variable stiffness spring;
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