University of Southampton OCS (beta), RASD 2013 11th International Conference on Recent Advances in Structural Dynamics 1st – 3rd July 2013

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Development of control system for dynamic absorber using neural oscillator and position control
tomo senda

Last modified: 2013-05-07

Abstract


This paper describes development of a new control system for active dynamic absorbers using a neural oscillator and position controller. When major earthquakes happen, it is necessary to shut down the traditional control systems designed by linear control theories. Typically as dynamic absorbers have stroke limitations of the mass due to the installation site, it is difficult for the linear systems to respond flexibly to changes of the stiffness as a result of destruction and deformation by earthquakes. On the other hand, a neural oscillator, which is a nonlinear oscillator, has been studied over the last few decades in the field of biology. The oscillator can be synchronized with an external sinusoidal input whose frequency is within a frequency band determined by the natural frequency of oscillator. In an effort to alleviate the problems associated with the stroke limitation and flexibility, the authors have recently proposed a new control system which is capable of confining the movable region of the mass and following the change of stiffness of the structure. The proposed control system consists of a mathematical model of the neural oscillator so-called Matsuoka oscillator and a position control system with a PD controller. However the proposed system is still coarse, and we are trying to further improve the system. In this paper, we deal with a new estimation method for the vibration energy in a structure. The proposed system requires information about vibrational energy at a specified natural frequency of the structure for determination of the travel distance of the auxiliary mass of dynamic absorber. We devise a new way using the neural oscillator, which has a function as a filter, and verify the method by numerical simulation.

References


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