Dynamic Analysis of a Flexible Beam Undergoing Reciprocating Rotational Motion

In this paper the dynamic characteristics of a flexible beam are determined experimentally and compared with those predicted by a simulation. A set of static experiments is first performed to validate the beam parameters and the experimental measurement approach. Next, the beam is set into motion as the rocker link of a planar four-bar crank-rocker linkage driven by a DC motor. Strain gauges, a potentiometer, and data acquisition system are employed to obtain measurements of the beam position history and corresponding strains during motion. From the signal analysis and data fit, the deflection and curvature of the flexible beam are determined. The simulation is carried out in ADAMS by creating a model with the same configuration and boundary conditions. The results of the experiment and simulation are closely matched. The long-term goal of this work is to develop practical means for continuous measurement of beam curvature and associated tip deflection and using that information to improve tip positioning control.