Experimental comparison of acoustic absorption between a time-varying and a constant nonlinear absorber

The study focuses on targeted energy transfer between two weakly and linearly coupled oscillators. One of the oscillators is subject to time-dependent and nonlinear restoring forcing terms. A previous study (using stochatsic optimization) has demonstrated improved vibration absorption with time-dependent nonlinear rigidity compared to a constant rigidity. An experimental test set-up has been designed and employed for experimentally validation of the optimized targeted energy transfer in the vibro-acoustics domain.