Optimising cabin acoustics

However, a large portion of development work is consumed by costly and time-intensive trials with test components. It is for this reason that the interdisciplinary project is focused on the development of powerful simulation models for various interior aeroplane lining components. This makes it possible to gain insights into the acoustic behaviour of components and to take them into consideration during the early phase of the design process. During the course of the project, scientists developed prediction models for the propagation of sound from the cabin lining in accordance with the finite element method, boundary element method and statistical energy analysis. They also investigated the suitability of various noise reduction measures, such as fibreglass, special honeycomb panels and Helmholtz resonators. An acoustic mock-up was constructed to enable simulation results to be checked against realistic conditions. It consists of a fuselage segment from an A340 against which sound is directed from loudspeakers. The two open sides of the model have been closed off with soundproof acoustic seals which also guarantee that the cabin is suspended isolated from vibrations. Thus measurements can be performed cost-effectively on the ground instead of during expensive test flights. In addition to verifying the results from calculations, the test mock-up also enables the effect of various linings on interior noise levels to be investigated.

Whether noise source identification, improvement of cabin acoustics, speech comprehensibility analyses, nano materials or air conditioning simulations - the experts and scientists at Hamburg's aeronautical centre are working intensively towards optimising and redesigning the aeroplane cabin. The objective is to maximise passenger comfort and to turn flying into a completely new experience. The research activities in the metropolitan region of Hamburg are supported by Airbus, Lufthansa Technik, the Hamburg University of Technology (TU HH), the College of Applied Sciences, the Technology Centre Hamburg-Finkenwerder, the University of Hamburg, the Helmut Schmidt University and more than 300 small and medium-sized businesses

For further information go to www.luftfahrtstandort-hamburg.de.