ABSTRACT
This chapter discusses active control of wind induced vibrations of adaptive tower structures. The non-autonomous control problem is reduced to intermittent autonomous controls by assuming that the power dissipated through the actuators is much larger than the power input from wind forces. Compared to seismic excitations, wind excitations are generally of much less power. If one uses a control time T which is sufficiently small relative to the time it takes for a structure to reach a predetermined energy level that triggers the controls, then the presence of nodal wind forces may be ignored during the controls. The chapter describes that power of actuators is much larger than power of excitations. In principle, actuators are placed on places where they are most effective in fulfilling their purpose. The number and the place of actuators are determined so as to fulfill the control objectives effectively and by requiring least energy.
