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ePaper created 2014-08-08, 11:09:35 | version 1.32.01
paign, the noise researchers used the DLR’s A320-ATRA research aircraft for a series of static engine tests. The test runs were carried out in Lufthansa Technik’s soundproof hangar at Hamburg Airport. Lufthansa Technik and Hamburg Airport supported the multidisci- plinary research project. Never before had the mounted engines of a commercial aircraft been studied with the simultaneous use of a large number of microphones and laser-optic metrology techniques while in operation. The objective of the project is to locate the zones within the engine flow where large, turbulent fluctuations in velocity and density produce noise. Once the project is completed, the researchers intend to deliver improved simula- tions of jet engines and their noise-producing flow structures. NORAH: A new noise study The NORAH (Noise-Related Annoyance, Cognition, and Health) study concerns the effects of noise produced by road, rail, and air traffic on the health and quality of life of the resident population of affected areas. Publica- tion of the NORAH report is expected some- time in the middle of 2015. The Lufthansa Group supports the study because of its broad scope and sound scientific basis. ß www.norah-studie.de Silencers for the Boeing 737 The Lufthansa Group retrofitted all of its Boeing 737 aircraft stationed in Frankfurt with new silencers in 2011 to bridge the period until new, quieter aircraft are delivered and to bring relief earlier to those living in the vicinity of the airport. The last Boeing 737 is to be taken out of service in 2015. ß Ú 03 /Active involvement in noise research The task of making air traffic ever quieter is a complex one. It requires the cooperative efforts of multiple actors. For this reason, the Lufthansa Group is working closely with partners in industry, government, academia, and major research institutions. We have been actively involved with the Quiet Traffic research network since 1999. This initiative, which is led by the DLR, relies on the interdis- ciplinary cooperation of industry, research institutions, and transport operators. It investi- gates specific problems related to noise from road, rail, and air traffic. Project MODAL: Identifying noise sources and improving noise abatement measures The Lufthansa Group is spearheading the project MODAL (Models and Data for the Development of Active Noise-Abatement Measures in Aviation) as part of the Aeronau- tics Research Program of the German Minis- try of Economics. The project is aimed at achieving a better understanding of the noise emissions produced by different types of aircraft. Another aim is to improve the analy- sis of active noise abatement measures through more precise calculations. Project SAMURAI: The cornerstone for quieter jet engines From September 23 to 28, 2013, DLR scien- tists used laser technology and microphones for the first time to analyze noise generation inside jet engines and on the main fan. In this elaborate and sophisticated measuring cam- Ú 02 /Retrofitting the existing fleet in order to reduce noise The Lufthansa Group is also retrofitting older aircraft in its fleet with noise-reducing tech- nologies. In this connection the Group is working closely with the German Aerospace Center (DLR) and the various aircraft manu- facturers. Some of the research findings resulting from this cooperation have already been incorporated into the manufacturing process. Lufthansa is retrofitting more than 200 aircraft with vortex generators so that they will fly more quietly in the future In February 2014 Lufthansa became the first airline in the world to take delivery of an Air- bus A320 equipped with vortex generators. A total of 157 aircraft in the existing fleet will be equipped with the new noise-reducing com- ponent, so that, when the expected new deliveries are added in, more than 200 A320 aircraft in total will be flying more quietly. These will be used on short- and medium- haul routes in Germany and Europe. The vortex generator technology [Ú 06] is based on the results of the research con- ducted by the Lufthansa Group and the DLR. Overfly measurements revealed that the vortex generators are able to eliminate two unpleasant tones. Initial measurements of the new aircraft with vortex generators have shown that the aircraft’s total noise level on approach falls by up to four decibels at dis- tances between 17 and 10 kilometers from the runway. Thus the Lufthansa Group has realized a key objective of the Alliance for More Noise Protection, a joint initiative of the Lufthansa Group, Fraport, the airline associa- tion BARIG, DFS, the Airport and Region Forum (FFR), and the government of the State of Hesse. This measure brings relief particu- larly to neighbors of the major hubs serving Frankfurt and Munich. [Ú 04] 04 Research for quieter flying: Lufthansa Technik’s soundproof hangar at Hamburg Airport. 16 // More quietly into the future