The Removal of Warbles or Beats in the Sound of a Bell
Sometimes the sound of a bell has warbles or beats as a result of the splitting of each partial into two components. Commonly the interval between components is a few cents. These warbles are caused by a non strictly rotation symmetric bell, for instance as a consequence of a local porosity in the bell wall. It is possible to bring both components into coincidence by lowering the higher component. This has to be done with one or more small vertical grooves in the antinodes of that component. Research was done into the correlation between the vertical place of the groove in the bell wall and the amount of lowering of the most important partials of a bell, viz. the five lowest. With the help of the results of this research some examples are given of removing warbles in a bell. To determine the best place and depth of the grooves linear optimisation was an excellent help.
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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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