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Using shock waves to improve the sound absorbing efficiency of closed-cell foams
Affiliation:1. GAUS, Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, Qc J1K 2R1, Canada;2. Shock Wave Laboratory, Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, Qc J1K 2R1, Canada;1. Laboratory of Metrology and Information Processing, Department of Physic, Ibn Zohr University, B.P. 8106, 80000 Agadir, Morocco;2. Laboratoire d’Ondes et Milieux Complexes, UMR CNRS 6294, Université du Havre 75, rue Bellot, 76600 Le Havre, France;1. Department of Materials Science (Glass and Ceramics), University of Erlangen-Nuremberg, Martensstrasse 5, D-91058 Erlangen, Germany;2. Energie Campus Nürnberg, Fürther Str. 250, 90429 Nuremberg, Germany;3. Nagoya Institute of Technology, Department of Materials Science and Engineering, Institute of Ceramics Research and Education, Gokiso-cho, Showa-ku, Nagoya-shi, Aichi 466-8555, Japan;4. Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;1. Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany;2. Department of Cardiology and Angiology I, Heart Center Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;3. Clinical Trials Unit, Medical Center—University of Freiburg, Freiburg, Germany;4. Department of Gynecology and Obstetrics, University Hospital Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;5. Department of Cardiac and Vascular Surgery, Heart Center Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;1. Institute for Biomechanics, ETH Zürich, Zürich, Switzerland;2. Human Performance Lab, Schulthess Clinic, Zürich, Switzerland;3. Department for Rheumatology and Rehabilitation, Schulthess Clinic, Zürich, Switzerland
Abstract:Producing closed-cell foams is generally cheaper and simpler than open-cell foams. However, the acoustic and filtration efficiency of closed-cell foam materials is generally poor because it is very difficult for fluid or acoustic waves to penetrate into the material. A new method using shock waves to remove the membranes closing the cell pores (known as reticulation) and thus to improve the acoustic and filtration behavior of closed-cell foam material is presented. Various shock treatments have been carried out on polyurethane and polyimide foams and the following conclusions were drawn: (1) reticulation efficiency increased and thus the airflow resistivity and tortuosity decreased when increasing the amplitude of the shock treatment; (2) the rigidity of the foam is decreased; (3) the process is reliable and repeatable and (4) obtained acoustic performance is comparable to classical thermal reticulation.
Keywords:Porous material  Open-cell foam  Reticulation  Shock wave  Sound absorption  Filtration  Airflow resistivity
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