Noise control for cooling fans on heavy vehicles

• Autores: Sabry Allam, Mats Abom
• Localización: Noise Control Engineering Journal, ISSN 0736-2501, Vol. 60, Nº. 6, 2012, págs. 707-715
• Idioma: inglés
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• Resumen

  • In this paper two different objects for fan passive noise control have been examined: heat exchangers and inlet/outlet parallel splitter silencers based on micro-perforated panels. The first object is theoretically and experimentally examined while the second is only examined experimentally. Throughout this paper two measurement methods were used. The ISO 15186-1:2000 to test the acoustic transmission for a diffuse field and plane wave testing in a duct of a sample cut from each heat exchanger type. Based on an anisotropic equivalent fluid model a theoretical model for the heat exchanger acoustic transmission is presented. A new type of splitter silencers based on micro-perforated plates, which can add damping up 10-20 dB in the frequency range of interest (<5 kHz), are also presented.