Control strategies in the active isolation of engineering systems

Active and semi-active vibration isolation methods are applied to many engineering systems. Typical applications are to rotorcraft vibration isolation systems and vehicle suspension. In this study both rotor vibration and vehicle suspensions are dealt with. Control strategies are studied in a simulated form by providing the characteristics of a controller via software. The approach described in providing control strategies is to use the multivariable state feedback control techniques to reduce the vibration level applied to the mechanical structure. Specifically the pole placement method is used to guarantee the stability of the rotor isolation system and at the same time to achieve sufficient gain and phase margins of the dominant closed-loop poles. Based on a frequency domain method, disturbance zeros are created which can eventually lead to complete elimination of the vibration level applied to a helicopter structure