Nonlinear vibrations of a multi-span continuous beam subject to periodic impact excitation

摘要

Excessive vibrations could result from vertical impact forces. An electromechanical device has been constructed on an experimental rig to investigate the frequency-dependent vibrations of a multi-span beam made of two parallel rods, for a stationary periodic impactor. Experimental time histories, phase planes and a bifurcation diagram are presented to illustrate to richness of the system dynamics. Both period one and period two responses have been observed, as well as more complicated (chaotic) outcomes.