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Effects of internal resonances in the pitch glide of Chinese gongs

Article dans une revue avec comité de lecture
Author
JOSSIC, Marguerite
541882 Institut Jean Le Rond d'Alembert [DALEMBERT]
ccTHOMAS, Olivier
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]
DENIS, Vivien
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]
CHOMETTE, Baptiste
541882 Institut Jean Le Rond d'Alembert [DALEMBERT]
MAMOU-MANI, Adrien
5234 Institut de Recherche et Coordination Acoustique/Musique [IRCAM]
ROZE, David
5234 Institut de Recherche et Coordination Acoustique/Musique [IRCAM]

URI
http://hdl.handle.net/10985/15360
DOI
10.1121/1.5038114
Date
2018
Journal
Journal of the Acoustical Society of America

Abstract

The framework of nonlinear normal modes gives a remarkable insight into the dynamics of nonlinear vibratory systems exhibiting distributed nonlinearities. In the case of Chinese opera gongs, geometrical nonlinearities lead to a pitch glide of several vibration modes in playing situation. This study investigates the relationship between the nonlinear normal modes formalism and the ascendant pitch glide of the fundamental mode of a xiaoluo gong. In particular, the limits of a single nonlinear mode modeling for describing the pitch glide in playing situation are examined. For this purpose, the amplitude-frequency relationship (backbone curve) and the frequency-time dependency (pitch glide) of the fundamental nonlinear mode is measured with two excitation types, in free vibration regime: first, only the fundamental nonlinear mode is excited by an experimental appropriation method resorting to a phase-locked loop; second, all the nonlinear modes of the instrument are excited with a mallet impact (playing situation). The results show that a single nonlinear mode modeling fails at describing the pitch glide of the instrument when played because of the presence of 1:2 internal resonances implying the nonlinear fundamental mode and other nonlinear modes. Simulations of two nonlinear modes in 1:2 internal resonance confirm qualitatively the experimental results.

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