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Transient Ray Tracing Method for High Frequency Bending Waves in Complex Structures

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High frequency transient wave propagation is a very interesting physical area. Currently, a large number of measurement methods are in use to qualify these signals. Typically, however, only the corresponding frequency domain spectra are computed and further investigated. Concerning the simulation of these signals there have been many attempts to approach real test signals. In many cases, however, it was only possible to calculate averaged spectra or low frequency time signals with an acceptable effort. In case of the application of crash impact sound sensing there is a need for simulating a high-frequency transient bending wave in the range from 5 to 20 kHz in the time domain. Thus, a simulation method based on the mathematical description of the main physical effects is developed (section 2). These formulas describe the wave propagation on its way through the structure. In order to get a good reproduction of propagation the infinite number of possible rays has to be reduced to only a few relevant rays (section 3). Here, the superposition of the single rays to the final time signal at the sensor position is also shown. In a further step the application of the simulation method for a typical car structure is shown and the good agreement between measurement and simulation is discussed (section 4). A short outlook on possible application areas (section 5) is followed by the conclusion (section 6).
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Document Type: Research Article

Publication date: July 1, 2012

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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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