171 research outputs found
Flyover Noise Measurements of a Spiraling Noise Abatement Approach Procedure
No full textDLR is investigating alternative low-noise approach procedures. One such procedure involves approaching the airport at a considerably higher altitude compared with standard landing trajectories, followed by a spiraling descent (helix flight path) shortly before the runway threshold. In this way, high ground noise levels by approaching aircraft are dislocated away from the common approach path and concentrated in the area near the helix path, i. e. in direct vicinity of the airport. Ground noise levels along the entire flight path prior to the helix are significantly reduced. The effectiveness of this procedure, referred to as Helical Noise Abatement Procedure (HeNAP), has been quantified by means of computational simulation analyses. These analyses also focused on aspects such as increased fuel
burn and the occurrence of multiple noise events below the helix. In June 2009 a new DLR autopilot especially capable of tracking curved flight path trajectories was flight tested.
Three HeNAPs were included in the flight plan, as well as standard and steep landing approaches. In addition, dedicated fly-over noise measurements were organized, supported by RWTH Aachen University. Twelve ground microphones have been installed along the common approach path and the helical flight segment. Despite adverse wind conditions at the only available test day, the measured data confirm the predicted noise dislocation effects.
High noise levels have been limited to observer locations around the helix. DLR noise prediction methods have been compared with the experimental data. Predicted trends
and noise dislocation effects are in good agreement with the measurements whereas the absolute numerical values show discrepancies. The flight test was closely accompanied by
a R&D member of DFS to study the impact of spiraling procedures on ATM integration
and air traffic controller workload, e. g. increased interaction with the pilots. Obviously, a spiraling approach procedure would not be implemented into the existing air traffic scenario with its common approach paths and highly frequented airports. The operational and economic environment still need more detailed investigation. Helical approaches become
more feasible for implementation at small, low-frequented regional airports or during night hours to avoid possible noise related curfews
Towards a Quiet Short Take-Off and Landing Transportation System: Concept Evaluation and ATM Integration
No full textAircraft Noise Assessment Using Noise Points: Conception and Verification
No full textThe increase in global air traffic volumes has significant economic and ecological impacts. A key factor in this context is the development of the noise situation around airports. However, assessing the development of the noise situation at multiple airports simultaneously and in detail requires comprehensive calculations. Therefore, there is a strong need for a simple method to evaluate how the growth of air traffic affects the noise impact around airports, especially under considerations of different what-if scenarios. This can be achieved by assigning a noise-equivalent value to each aircraft that represents its noise impact. These noise points indicate how many movements of a reference aircraft would be required to produce approximately the same noise impact as one movement of the aircraft under consideration. The concept allows for an easy and quick assessment of aircraft noise by summing such noise points, because, as shown in this study, the noise point sum can directly be related to a change in noise levels and contour area. This article presents a promising method for determining noise points and applies it to aircraft groups from a recently proposed database of the German aircraft noise calculation method AzB. The noise point concept is verified at various airports, demonstrating its effectiveness in representing noise situations and developments. The differences of analyzed contour areas obtained via noise calculations and via the noise point concept remain below 3.6% over a generic 30-year forecast
Aircraft Noise
No full textThis reprint is about aircraft noise. Multidisciplinary topics are covered. One focus is supersonic transport aircraft and their noise generation during approach and take-off. The articles within this study present recent and ongoing research activities from research entities and universities from around the world. This book is beneficial for engineers and researchers that are working the field of aircraft noise
Aircraft Noise Mitigation - Concepts, Assessment, and Implementation
No full textDLR has initiated a special issue in the area of aircraft noise mitigation. Contributions aim at novel concepts, the assessment, and the implementation of such mitigation measures.
This Special Issue aims to attract contributions on the mitigation of exterior aircraft noise—specifically covering the following three subtopics: (1) concepts, (2) assessment, and (3) implementation. Contributions can focus on conventional or novel transport aircraft, conceptual supersonic transport aircraft, or advanced air mobility vehicles
Validation strategies for comprehensive aircraft noise prediction methods
No full textThis contribution deals with validation and verification issues in aircraft noise prediction. We use two different comprehensive simulation software: PANAM, developed at DLR and FLIGHT, developed at the University of Manchester. The comparison is done on the basis of extensive flight data taken on an Airbus A319-100 operated by Lufthansa. The flight recorder data have been synchronized with noise measurements on the ground, at 25 different observer locations. This paper aims to contribute to the establishment of rational validation standards, as well as realistic accuracy margins on integral noise metrics. The computer codes are briefly described. Results are shown for a variety of microphone positions, located sideways and directly along selected departure and approach flight ground tracks. © 2012 by A. Filippone, L. Bertsch & M.Pott-Pollenske
Narrative Strategies in Benedikte Naubert's Neue Volksmarchen der Deutschen
No full textNo abstract available
Introduction to Aircraft Noise Activities at ICAO CAEP with Ongoing and Future Contributions from DLR
No full textICAO and CAEP activities are presented. Focus lies on activities in the field of aircraft noise. DLR support of these activities are introduced. A special focus lies on the simulation capabilities from DLR that support a reasonable decision making in the context of aircraft noise in ICAO CAEP
From emission to immission - aircraft noise reserach at DLR Göttingen
No full textPresentation of selected activities at DLR Göttingen in the context of aircraft noise research. Methods and Tools are presented, guidelines for the design of low-noise concepts are provided, and initial thoughts on upcoming Advanced Air Mobility concepts are provided
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