Measuring Frequency Dependent Material Properties by Use of N-Parameter Models
The measurement of material properties is an important task. Quantities such as Young's modulus and the shear modulus, Poisson's ratio and material damping must be known when dealing with noise problems in analytical and numerical calculations. By classical methods, often only a single number is obtained which is real and independent of frequency. Sometimes, however, this is not sufficient. If a material behaves visco-elastically, we can use N-parameter-models to describe its behaviour. Then, the aforesaid properties can be described as complex numbers and in dependence of frequency, often with just a fistful of parameters which are valid for a wide frequency range. This paper gives a short introduction into the theory of visco-elastic materials and presents three different measurement examples of parameter identification.
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Document Type: Research Article
Publication date: July 1, 2008
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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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