Active Vibration Control of Flexible Rotors on Maneuvering Vehicles

This paper presents a simulation to actively control transverse vibration of a flexible rotor shaft system mounted on a moving vehicle (e.g., a ship or an aircraft). Discretizing the rotor continuum with beam finite elements, equations of motion are written with respect to a noninertial frame attached to the frame of the moving vehicle. Such equations are linear but contain time-varying parametric terms due to the motion of the carrier vehicle. Through numerical simulation, it is shown that the transverse response in the bending vibration of the rotor shaft relative to the supporting structure is significantly influenced by the inertia force, as well as the parametric excitations due to vehicle motion. A control strategy is proposed using an electromagnetic actuator placed at a suitable location along the span of the rotor, and it is found extremely useful in reducing the vibration of the rotor and improving its stability. Examples are given in support by studying both the uncontrolled and the controlled motion of a rotor shaft system carried by an aircraft undergoing two different kinds of maneuvers.

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