Active control of flexural vibration of a hollow cylindrical rod using MFC actuators

Abstract

In this study, the geometry of the handlebars of bicycle is simulated as a hollow cylindrical rod, subjected to flexural vibration transmitted from a head tube. Analytical prediction as well as experimental investigation are implemented to evaluate the effectiveness of active control of flexural vibration of the handlebars using Macro-Fiber Composite (MFC) actuators. The newly developed MFC actuators are typically directional or anisotropic, and more flexible and conformable as compared to traditional monolithic isotropic piezoceramic actuators. Predictions of the finite element model are validated experimentally using a cantilevered cylindrical rod surface bonded with three flexible MFC actuators, two placed at the clamped end and the third at the bend location. A primary disturbance is assumed to be transmitted from the clamped end, while a secondary force from the MFC actuators. The velocity feedback and the LQR controller are utilized to determine appropriate voltage inputs into the MFC actuators. Close agreement is found between theoretical assumptions and experiments. The results obtained suggest that using the MFC actuators in controlling the flexural wave transmission through hollow cylindrical rod has been effective.