Abstract
A control method has been developed to always excite a multi-degree-of-freedom system efficiently at a resonance frequency. We proposed control methods to Multi-degree-of-freedom system can self-excite at all resonance frequency in ideal conditions. It's local FB control and cross FB control. The local FB control is a distributed control system that has a phase lag of 90° and a constant gain in a wide frequency range, and the cross feedback control mutually exchanges control signal between adjacent local feedback controllers. By using these control methods, all natural vibration modes can be excited, and maintained against a disturbance. However, we must consider large damping to putting this control method to practical using. In this paper, integral control is added to damping element of distributed control to form all self-excited vibration mode with low active damping gain in large damping conditions. Increasing gain of damping element at low frequency can assist formation of the self-excited vibration modes. We verified performance of this control system in large damping condition. At first, we verified all the natural vibration modes are excited by adding integral control into damping element. Additionally, we verified the natural vibration modes are excited at resonance frequency. Finally, we verified amplitude of the vibration is maintained against large damping.
