Abstract
In the present contribution we are going to investigate a special class of acoustic metamaterials, i.e. synthetic foams with spherical inclusions. This study is motivated by the need for an improved acoustical behavior of engines and vehicles which is one important criterion for the automotive industry. In this context, innovative materials offering a high damping efficiency over a wide frequency range are becoming more and more important. Since there is an innumerable selection of different absorbing materials with an equally large range of properties numerical studies are inevitable for their assessment. In the paper at hand, we look at a special class of such materials in which the influence of the inclusions on the acoustical behavior is examined in detail. To this end, we vary the size, mass density, number and position of spherical inclusions. Here, the main goal is to improve the damping properties in comparison to conventional materials which can be bought off the shelf. In that regard, the lower frequency range is of special interest to us. The results show that a random distribution of the inclusions should be favored while for the other parameters values that are centered within the investigated interval are recommended.
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Acknowledgements
The presented work is part of the joint project COMO “Competence in Mobility”, which is financially supported by the European Funds for Regional Development (EFRE) as well as the German State of Saxony-Anhalt. This support is gratefully acknowledged.
We would also like to thank our colleague Peter Schrader from the Institute of Mobile Systems (Otto-von-Guericke-Universität Magdeburg) for numerous fruitful discussions, the successful cooperation during the last years and the execution of the experiments, which supported our efforts to gain a deeper insight into the acoustical behavior of metamaterials and their most important influence parameters.
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Duvigneau, F., Duczek, S. (2018). A Numerical Study on the Potential of Acoustic Metamaterials. In: Altenbach, H., Carrera, E., Kulikov, G. (eds) Analysis and Modelling of Advanced Structures and Smart Systems. Advanced Structured Materials, vol 81. Springer, Singapore. https://doi.org/10.1007/978-981-10-6895-9_2
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