Archives of Acoustics, 41, 3, pp. 527–533, 2016
10.1515/aoa-2016-0051

Numerical Study of Forced Vibration Suppression by Parametric Anti-Resonance

Ludĕk PEŠEK
Institute of Thermomechanics AS CR, v.v.i.
Czech Republic

Petr ŠULC
Institute of Thermomechanics AS CR, v.v.i.
Czech Republic

Ladislav PŮST
Institute of Thermomechanics AS CR, v.v.i.
Czech Republic

The parametric anti-resonance phenomenon as an active damping tool for suppression of externally excited resonant vibration is numerically studied herein. It is well known fact that the anti-resonance phenomenon, i.e. the stiffness periodic variation by subtractive, combination resonance frequency, brings stabilization and cancelling into self-excited vibrations. But this paper aims at a new possibility of its application, namely a damping of externally excited resonant vibration. For estimation of its effect we come both from a characteristic exponent of the analytical solution and numerical solution of forced vibration of 2DOF linear system with additional parametric excitation. The amplitude suppression owing to the parametric anti-resonance is studied on several parameters of the system: a depth of parametric excitation, mass ratio, damping coefficient and small frequency deviations from the parametric antiresonance.
Keywords: active damping; parametric anti-resonance; external harmonic excitation.
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DOI: 10.1515/aoa-2016-0051

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