Aircraft Noise Pollution in Communities living close to commercial passenger airports world-wide could have been avoided if, following the Second World War, Governments and Local Planners had built very large commercial airports according to strong directives and regulations preventing the building of residential houses in zones in the vicinity to the airport boundary. Today the challenge is to use the experience gained in recent years on flow and noise control in respect of quiet aircraft noise reduction technology(QAT) and its applications, capable of reducing and even eventually eliminating the aircraft noise problem within communities close to airports. In this study the necessary parameters are set out for the design of such future aircraft having safe flight trajectories at takeoff and approach to landing when overflying residential areas close to all airports. To achieve this future noise reduction goal it is necessary to extend the present QAT program, based on an interim solution requiring the refurbishment of existing conventional takeoff and landing (CTOL) aircraft to reduce by 10 dB the noise in communities close to the airport. It will be shown that to achieve the extended goal the likelihood is that all commercial aircraft will need to fly higher and slower in overflying residential areas involving a revolution in the low speed operation of all air transport. Residents, however, would then finally recognize by sight and sound that technology, supported by Governments and Local Authorities, has at last produced a solution to this long standing aggravation of aircraft noise nuisance and annoyance in residential communities. The different types of aircraft capable of meeting this challenge are reviewed in the current study. It is shown that one solution to this problem is to changeover from CTOL aircraft to short takeoff and landing(STOL) aircraft operating with Circulation Control. This would eliminate the need for the final approach to landing along the 3 degree ILS glide slope, involving overflying at low altitude communities living close to an airport. Such a revolution in ATC, fly-by-wire and pilot handling in replacing this tried and tested approach, by a slower speed STOL circulation control aircraft flying a new safe steep approach path trajectory with the aircraft flying at a low shallow nose up attitude relative to the ground will need pilot approval with FAA and International acceptance. The final approach would follow a continuous descent trajectory from cruise to an altitude near 1000 m with a changeover to STOL operation for the final approach to landing. Such a STOL approach to landing is similar to that used by helicopters. There exists a vast amount of knowledge and experience on this type of STOL aircraft, which has been used successfully for military and small commercial aircraft on short-haul operations. This approach to landing will allow an increase in the slant distance from aircraft to people on the ground, and thereby reduce the noise in residential communities close to the airport. Current research is now focused on the optimization of this type of aircraft for small, medium and large commercial aircraft to ensure this type of aircraft can not only meet all its cruise and low speed performance and economic goals with safe flight trajectories, but also those specially related to the large noise reduction predictions that will need confirmation in the communities close to airports at take-off and on the approach to landing. Little research has been directed so far to the assessment of the noise, and methods for its reduction, for the circulation control aircraft flying a steep approach trajectory. The aim of this study is to seek a revolution in the optimum design of the STOL circulation control aircraft flying safe and acceptable low speed and 'low' noise trajectories for all commercial passenger aircraft, including both subsonic and supersonic aircraft. The aim is to ensure all aircraft overflying residential areas maintain a separation distance of at least 1000 m.
Circulation control for quiet commercial aircraft
Zirkulationsregelung für ein leises Verkehrsflugzeug
2006
16 Seiten, 20 Quellen
Aufsatz (Konferenz)
Englisch
Flugzeugbau , Aeroakustik , Zirkulation , Schallabstrahlung , Flughafen , Schallpegel , Flugbahn , Landebahn , Lärmminderung , Flughöhe
Circulation Control for Quiet Commercial Aircraft
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