Noise Reduction for a High Performance Military Aircraft – General Approach and Current Status
Regular paper
Airbus Defence and Space
Monday 1 june, 2015, 16:40 - 17:00
0.6 Madrid (49)
Abstract:
Noise reduction for civil aircraft has been an important issue for aircraft
manufacturers as well as for airport operators within the last decades.
Meanwhile a huge set of requirements and rules coming from annoyed
residents, legal regulations, and customers, i.e. airline companies have to
be taken into consideration. However for a long time less emphasis has been
placed on noise reduction for military aircraft due to several reasons. Yet
this seems to be subject to change over the past years leading to the
necessity of developing strategies and technical solutions for military
aircraft noise abatement.
In the paper proposed here the overall approach and actual status of an
industrial noise reduction initiative for a specific high performance
military aircraft is presented. However as the according processes and
techniques developed are by their very nature generic to a large extent
application to other aircraft (types) would be straightforward in principle.
As aspects of noise reduction nevertheless still are of minor importance for
the design and development of military aircraft especially compared to
operational requirements the focus for the approach presented here has been
mainly placed on noise immission rather than emission. As obviously the
predominant nuisance generated by aircraft is in the vicinity of the
respective airfields the overall goal defined is the reduction of aircraft
noise by optimisation of according takeoff climb (and furthermore landing
approach) flight paths.
Basis for such optimisations has to be a validated aircraft noise model
consisting of the three main components noise emission (analytic modular
approach), propagation (modified ray tracing), and immission (metrics and
refraction). The specific approaches and current status of work in
development of the corresponding models will be presented together with
first calculation results and the plan for the following activities and
future enhancements.