Passive control of resonances by nonlinear absorbers

Shao, Jianwang; Cochelin, Bruno

doi:10.1051/matecconf/20120105006

Cited by 1 publication

(1 citation statement)

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“…As described in [17], the NNMs can be used to estimate the forcing level for the beginning of TET. This threshold is defined as the forcing level where the resonance peak of the periodic response coincides with the maximum point of the second nonlinear mode around the considered mode.…”

Section: Linear and Nonlinear Modes Of The Systemmentioning

confidence: 99%

Experimental evidence of simultaneous multi-resonance noise reduction using an absorber with essential nonlinearity under two excitation frequencies

Côte

Pachebat

Bellizzi

2014

Journal of Sound and Vibration

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The addition of an essentially nonlinear membrane absorber to a linear vibroacoustic system with multiple resonances is studied experimentally, using quasiperiodic excitation. An extended experimental dataset of the system response is analyzed under steady state excitation at two frequencies. Thresholds between low and high damping states within the system and associated noise reduction are observed and quantified thanks to frequency conversion and RMS efficiency indicators. Following previous numerical results, it is shown that the membrane NES (Nonlinear Energy Sink) acts simultaneously and efficiently on two acoustic resonances. In all cases, the introduction of energy at a second excitation frequency appears favorable to lower the frequency conversion threshold and to lower the noise within the system. In particular a simultaneous control of two one-to-one resonances by the NES is observed. Exploration of energy conversion in the two excitation amplitudes plane advocates for a linear dependence of the frequency conversion

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Section: Linear and Nonlinear Modes Of The Systemmentioning

confidence: 99%