Experimental investigation of targeted energy transfers in strongly and nonlinearly coupled oscillators
Linear oscillator coupled to a lightweight NES.
Frequency-energy plot ; unfilled dots represent points of stability exchange.
Close-up of the .
Experimental setup. (a) General configuration; (b) experimental impulsive force .
(a) Schematic of the experimental fixture; (b) mass repartition (grey: primary system; black: NES.
Measured restoring force represented as a function of (a) time and (b) relative displacement .
Experimental results for low damping (left column: ; right column: ; note differing durations): (a), (b) measured accelerations; (c), (d) measured displacements; (e), (f) percentage of instantaneous total energy in the NES; (g), (h) displacement of the primary system (NES versus grounded dashpot).
Experimental results for high damping : (a) measured accelerations; (b) measured displacements; (c) percentage of instantaneous total energy in the NES; (d) measured and simulated energy dissipated in the NES; (e) displacement of the primary system (NES versus grounded dashpot); (f) restoring force.
Superposition of the wavelet transform of the relative displacement across the nonlinearity and the frequency-energy plot. (a) , low damping; (b) , high damping.
Case of increased nonlinear coefficient: (a) measured accelerations; (b) measured displacements; a comparison between predicted and measured accelerations: (c) primary system; and (d) NES; (e) motion in the configuration space; (f) percentage of instantaneous total energy in the NES.
Targeted energy transfer for a mass ratio of 0.04. (a) Displacements; (b) percentage of instantaneous total energy in the NES.
System parameters identified using modal analysis and the restoring force surface method.
Nonlinear beating phenomenon: energy transferred to the NES and transfer time.
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