Messleitungen für Biegewellen
Mechanical impedances may be measured in a way analogous to measurements in the acoustical impedance tube and the electrical transmission line. A metal rod is used to transmit bending waves, and mechanical impedances are measured as a function of the length and the termination of the rod. The various terminations are obtained by using an electrodynamical system attached to the rod, and capable of exerting forces as well as couples. This enables a reflection-free termination to be obtained in three ways, viz. by using either a pure couple or a pure transverse force or both simultaneously with suitable amplitude and phase. — Apart from the electro-mechanical damping, a study is made of the non-reflecting termination obtained with wedge-shaped terminations using layeis of sand as damping material. Their absorption is measured as a function of frequency for various lengths, profiles and sand loads. The amplitude distribution along the length of the wedges enables conclusions to be drawn about the damping mechanism.
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Document Type: Research Article
Publication date: January 1, 1956
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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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