Modifying the Resonances of a Xylophone Bar Using Active Control
A simple active control method is described which extends the possibilities of a xylophone bar. It allows the performer to modify the vibration of its structure, unlike post-processing effects involving loudspeakers. These variations change the characteristics of the partials radiated by the bar. The xylophone bar, made of composite material, is equipped with two actuators and one sensor in PVDF (polyvinylidene fluoride), the mass and stiffness of which do not modify the mechanical characteristics. A controller in a feedback loop is executed on a midrange digital signal processor. It is composed of a sum of second order band-pass filters. The selection of the controller coefficients relies on the measured transfer function between the input of the controller and the output of the sensor. First the active control method is designed to modify the resonance peaks of a simple model of a xylophone bar, whose transfer function is a superposition of three eigenmodes. Then it is applied to the real system. It is illustrated by increasing and reducing the amplitudes and/or frequencies of the first resonances, and by modifying the tuning of the xylophone bar.
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Document Type: Research Article
Publication date: March 1, 2015
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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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