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Lyapunov Exponents from Experimental Time Series: Application to Cymbal Vibrations

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Lyapunov exponents are among the most relevant and most informative invariants for detecting and quantifying chaos in a dynamical system. This method is applied here to the analysis of cymbal vibrations. The advantage of using a quadratic fit for determining the Jacobian of the dynamics is presented. In addition, the interest of using a time step for the evolution of the neighbourhood not equal to the timelag used for the reconstruction of the phase space is underlined. The robustness of the algorithm used yields a high degree of confidence in the characterization and in the quantification of the chaotic state.

To illustrate these features in the case of cymbal vibrations, transitions from quasiperiodicity to chaos are exhibited. The quasiperiodic state of the system is characterized together by the power spectrum of the experimental signal and by calculation of the Lyapunov spectrum.
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Document Type: Research Article

Publication date: May 1, 2000

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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