Full-scale noise testing on Airbus landing gears in the German Dutch Wind tunnel

摘要

The acoustic flyover signature of modern aircraft in their approach configuration, i.e., with slats, flaps and gears deployed, are often dominated by airframe noise contributions. ^To study relevant source and radiation characteristics, airframe noise tests were performed in the German-Dutch Wind Tunnel employing full-scale landing gears of an A320 aircraft. ^Far-field noise characteristics were determined for different gear configurations (starting from the base configuration and subsequently covering ever more gear elements with streamlined fairings) at wind speeds ranging from 40 to 78 m/s. ^Aerodynamically generated noise from landing gears turns out to be of a broadband nature with constant levels up to several kHz. ^Therefore, landing gear noise is not at all an 'LF phenomenon'. ^Moreover, levels increase with the sixth power of flow velocity. ^The study indicates that a technically feasible landing gear noise reduction potential of up to 5 EPNdB could be realized through localized component streamlining with fairings and/or by means of appropriate flow spoilers. ^(Author)