Header menu link for other important links
Order reduction and closed-loop vibration control in helicopter fuselages
A. Mathews, V.R. Sule,
Published in
Volume: 25
Issue: 2
Pages: 316 - 323
The problem of vibration reduction in helicopter fuselages using the concept of active control of structural response is addressed. When the large size of the coupled gearbox-flexible fuselage system dynamics is considered, first a balanced-realization-based order reduction is employed to reduce the size of the problem. Then using the reduced-order model, a closed-loop controller is designed to minimize the vibratory levels in the fuselage with the constraint that the controller ensures stability of the original full-order system. The controller design is based on the concept of disturbance rejection by the internal model principle. When a four-block representation of the problem and doubly coprime factorization theory is employed, a stable controller is designed for this multi-input/multi-output control problem. It is observed that this controller yields a closed-loop transfer function, which rejects the external disturbance not only at the desired frequency but also in its neighborhood. In addition, contrary to open-loop control, the present technique of closed-loop control reduces the vibratory levels both in the fuselage and the gearbox. The influence of sensor locations on vibration minimization has also been highlighted.
About the journal
JournalJournal of Guidance, Control, and Dynamics