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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Experimental and numerical assessment of the orthotropicthinplate model for corrugated panels
 Borkowski, B. ; European Acoustics Association EAA: Forum Acusticum 2014. CDROM : Krakow, 7  12 September 2014 Krakow, 2014 ISBN: 9788361402282 6 pp. 
 Forum Acusticum <7, 2014, Krakow> European Congress on Acoustics <2014, Krakow> 

 English 
 Conference Paper 
 Fraunhofer IBP () 
Abstract
Corrugated panels are often employed as construction elements of modern industrial buildings, such as roofs, claddings and walls. The primary objective of the periodic corrugation is to enhance the bending stiffness in one direction. A common method for analyzing the dynamic behavior of these boards uses an orthotropicthinplate model: The actual panel is replaced by an 'equivalent' plane homogeneous orthotropic plate of constant 'equivalent' mass per area and with 'equivalent' bending stiffnesses. Since this substitution is by no means trivial, it is essential to study the quality and range of validity of this approximation. A number of researchers derived formulas for equivalent bending stiffnesses of sinusoidal and trapezoidal panels in various manners. The formulas are checked against two simple assessment criteria involving height and period of the corrugation. As the height approaches zero, the curvature of the panel converges to zero. Similarly, as the period approaches infinity, the curvature tends to zero, too. In these limits of zero curvature, the equivalent bending stiffnesses must coincide with those of a flat panel. In the case of infinitely long corrugation period none of the suggested models comply with this requirement. Nevertheless, two equivalentstiffness models are used to compute eigenfrequencies of freely suspended panels. In addition, measurements and finiteelement calculations with COMSOL were performed, which agree well with each other. Good agreement with the results of the approximate models is achieved only for loworder modes.