System Noise Assessment of a Tube-and-Wing Aircraft with Geared Turbofan Engines

Bertsch, Lothar; Wolters, Florian; Heinze, Wolfgang; Pott-Pollenske, Michael; Blinstrub, Jason

doi:10.2514/1.c034935

Cited by 16 publications

(22 citation statements)

References 10 publications

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“…The noise prediction of the aircraft designs considered in this work (see Sect. 3) is based on the simulation process established and validated by Bertsch [17,18]. An overall picture of this methodology is illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the present study focuses on the application of the developed methodology to assess the sound quality of an innovative medium-range aircraft design with fan-noise shielding architecture. This vehicle was selected from the work of Bertsch [17] due to its low-noise potential, and was assessed by previous works [18,19] by means of conventional sound metrics. For the sake of comparison, a reference aircraft with specifications similar to an Airbus A319 is also considered in our study.…”

Section: Introductionmentioning

confidence: 99%

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Sound quality assessment of a medium-range aircraft with enhanced fan-noise shielding design

et al. 2021

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The investigation of technologies that can improve the sustainability of the air transport system requires not only the development of alternative fuel concepts and novel vehicle technologies but also the definition of appropriate assessment strategies. Regarding noise, the assessment should reflect the situation of communities living near airports, i.e., not only addressing sound levels but also accounting for the annoyance caused by aircraft noise. For this purpose, conventional A-weighted sound pressure level metrics provide initial but limited information as the level- and frequency-dependency of the human hearing is accounted for in a simplified manner. Ideally, subjective evaluations are required to adequately quantify the perceived short-term annoyance associated with aircraft noise. However, listening tests are time-consuming and not suitable to be applied during the conceptual aircraft design stage, where a large solution space needs to be explored. Aiming at bridging this gap, this work presents a methodology for the sound quality assessment of computational aircraft noise predictions, which is hereby conducted in terms of objective psychoacoustic metrics. The proposed methodology is applied to a novel medium-range vehicle with fan noise shielding architecture during take-off and landing procedures. The relevance of individual sound sources, i.e., airframe and engine noise contributions, and their dependencies on the aircraft architecture and flight procedures are assessed in terms of loudness, sharpness, and tonality. Moreover, the methodology is steered towards community noise assessment, where the impacts on short-term annoyance brought by the novel aircraft design are analysed. The assessment is based on the modified psychoacoustic annoyance, a metric that provides a quantitative description of human annoyance as a combination of different hearing sensations. The present work is understood as an essential step towards low-annoyance aircraft design.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sound quality assessment of a medium-range aircraft with enhanced fan-noise shielding design

et al. 2021

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“…Different specific limits for the operation of subsonic aircraft are defined when assessing the EPNL at these measurement points. These regulations are finally implemented in the existing simulation process at DLR, e.g., as described in Reference [2], in order to assess the corresponding certification noise level for existing and novel aircraft designs within the conceptual design phase. Ultimately, the certification levels can be selected as design criteria, and hence can be subject to a low-noise optimization of the vehicle design.…”

Section: Icao Noise Certificationmentioning

confidence: 99%

“…External input data, such as engine performance maps, geometrical details, or the flight procedure, can be processed via dedicated interfaces in order to improve prediction accuracy if required and available [2]. Simulation results from corresponding software modules within PrADO are then directly replaced by external input data, and the PrADO modules will not be executed.…”

Section: Aircraft Designmentioning

confidence: 99%

“…For example, any modification to a component design will not only affect a specific noise source on board but can also determine the flight performance of the final vehicle, e.g., as demonstrated in Reference [2]. According to the underlying flight performance along the approach and departure, the operating condition, and hence, the noise generation of each noise source, is directly and significantly affected.…”

Section: Introductionmentioning

confidence: 99%

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Application of Noise Certification Regulations within Conceptual Aircraft Design

Nöding

Bertsch

2021

Aerospace

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ICAO Annex 16 regulations are used to certify the acoustic performance of subsonic transport aircraft. Each aircraft is classified according to the measured EPNL levels at specific certification locations along the approach and departure. By simulating this certification process, it becomes possible to identify all relevant parameters and assess promising measures to reduce the noise certification levels in compliance with the underlying ICAO regulations, i.e., allowable operating conditions of the aircraft. Furthermore, simulation is the only way to enable an assessment of novel technology and non-existing vehicle concepts, which is the main motivation behind the presented research activities. Consequently, the ICAO Annex 16 regulations are integrated into an existing noise simulation framework at DLR, and the virtual noise certification of novel aircraft concepts is realized at the conceptual design phase. The predicted certification levels can be directly selected as design objectives in order to realize an advantageous ICAO noise category for a new aircraft design, i.e., simultaneously accounting for the design and the resulting flight performance. A detailed assessment and identification of operational limits and allowable flight procedures for each conceptual aircraft design under consideration is enabled. Sensitivity studies can be performed for the relevant input parameters that influence the predicted noise certification levels. Specific noise sources with a dominating impact on the certification noise levels can be identified, and promising additional low-noise measures can be applied within the conceptual design phase. The overall simulation process is applied to existing vehicles in order to assess the validity of the simulation resultsfcompared to published data. Thereafter, the process is applied to some DLR low-noise aircraft concepts to evaluate their noise certification levels. These results can then be compared to other standard noise metrics that are typically applied in order to describe aircraft noise, e.g., SEL isocontour areas. It can be demonstrated that certain technologies can significantly reduce the noise impact along most of an approach or departure flight track but have only a limited influence on the noise certification levels and vice versa. Finally, an outlook of the ongoing developments is provided, in order to apply the new simulation process to supersonic aircraft. Newly proposed regulations for such concepts are implemented into the process in order to evaluate these new regulations and enable direct comparison with existing regulations.

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Perception-based noise assessment of a future blended wing body aircraft concept using synthesized flyovers in an acoustic VR environment—The ARTEM study

Pieren,

Le Griffon,

Bertsch

et al. 2024

Aerospace Science and Technology

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System Noise Assessment of a Tube-and-Wing Aircraft with Geared Turbofan Engines

Cited by 16 publications

References 10 publications

Sound quality assessment of a medium-range aircraft with enhanced fan-noise shielding design

Sound quality assessment of a medium-range aircraft with enhanced fan-noise shielding design

Application of Noise Certification Regulations within Conceptual Aircraft Design

Perception-based noise assessment of a future blended wing body aircraft concept using synthesized flyovers in an acoustic VR environment—The ARTEM study

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