The presented simulation technique can be used for a fast estimation of the sound propagation in real car bodies and the expected sensor signals. It is possible, to get a basic knowledge over the structure-born sound transmission behaviour in an early stage without cost intensive measurements or time harvesting FEA-simulations. Therewith the effects of multiple reflections, the spreading loss and the spreading of the signal due to dispersion could be calculated in a split second. The solution of complex systems can be derived by iterative combination of different single path. Here the gainable precision of the estimates mostly depends on the complexity of the model including the length of the transmission path and the application of multiple paths in parallel. Thus it is possible to enhance the precision in accepting higher effort in predicting the models parameter. Although even if the longitudinal wave (symmetric lamb wave) carries less energy, its implementation by a second parallel transmission network would improve the estimate of the rising impulse flank and the smaller oscillation superposing the main signal. Based on the fact that each joining can converse bending waves into longitudinal waves and vice versa this would result in very complex networks. The inclusion of multiple reflections at the outer boundaries, mode conversion, secondary wave modes and non-linearities would
Precise characterization of structure-borne sound transmission applied on crash sensing technologies
Genaue Beschreibung der von der Struktur hervorgerufenen Schallaussendung. Anwendung bei Crash-tests
2009
6 Seiten, 7 Bilder, 10 Quellen
Conference paper
English
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