This datasets contains experimental data that was recorded during experiments with our self-adaptive beam-slider system. Under external harmonic excitation, this system has the capability to passively adjust its dynamics such that a very large vibration level is achieved and maintained in a broad range of operating conditions. Measured quantities are time [s], beams velocity [m/s] at x=4*L/7 (where L is the beam's length) and the relative slider position (i.e. slider position normalized by L) [-].