Uncertainty Analysis for Parametric Aircraft System Noise Prediction

Bertsch, Lothar; Schäffer, Beat; Guérin, Sébastien

doi:10.2514/1.c034809

Cited by 28 publications

(25 citation statements)

References 21 publications

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“…Initial work on uncertainty assessment at DLR and NASA is documented in Refs. 33 and 34 . Noise shielding effects which are of utmost importance for novel low-noise configurations are addressed in the accompanying paper 2 where prediction results for the V-2 aircraft are described and discussed.…”

Section: Discussionmentioning

confidence: 99%

The Aircraft Noise Simulation Working Group (ANSWr) - Tool Benchmark and Reference Aircraft Results

Bertsch

Thomas

Sanders³

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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The Aircraft Noise Working Group (ANSWr) was established by DLR, ONERA, and NASA to compare simulation tools, establish guidelines for noise prediction, and to assess uncertainties associated with the simulation. To accomplish these goals, a benchmark problem was initiated by the group. The setup is documented and initial results for the reference aircraft are discussed. The reference aircraft is a conventional tube-andwing configuration with the engines installed under the wings. The aircraft noise simulations are performed for departure and approach conditions, and the results obtained with three different system noise prediction tools are compared. At the aircraft level, the overall agreement is good between the three predictions. Peak noise levels agree within 3-4 dB. Fan and jet component predictions are generally very similar although there can be differences of up to 7 dB in some fan tone levels. The prediction of airframe components shows the most disagreement between the three methods with some differences of 6 dB for the major components and greater differences at high frequencies. There can also be differences in the frequency of the peak level and in the rank order of the airframe components. At the total airframe noise level, the differences are reduced to no more than 3-4 dB. While there is general agreement in shape characteristics of predicted ground noise isocontours, the differences between the three methods can result in more significant disagreement in the sizes of the isocontours.

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Section: Discussionmentioning

confidence: 99%

The Aircraft Noise Simulation Working Group (ANSWr) - Tool Benchmark and Reference Aircraft Results

Bertsch

Thomas

Sanders³

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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“…It included additional updates and upgrades to the process toward its current status with the focus on noise immission in early 2018, see Refs. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]…”

Section: Simulation Processmentioning

confidence: 99%

“…The overall uncertainties of the predicted noise immission are defined as a combination of input data, modeling, and propagation uncertainty as described in Refs. 36,37 2. The goal of this research is an overall assessment of selected low-noise technologies and vehicle concepts within large airport scenarios.…”

Section: "Toward a Fully Automated Low-noise Design Process" (2009-2012)mentioning

confidence: 99%

10 years of joint research at DLR and TU Braunschweig toward low-noise aircraft design-what did we achieve?

Bertsch¹,

Heinze²,

Guérin³

et al. 2019

AAOAJ

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This review article is based on an invited keynote presentation at the 22nd Workshop of the Aeroacoustics Specialists Committee of the CEAS. The event was held in September 2018 in Amsterdam with the main focus on the relation between aircraft design and noise impact. This article reviews the last years of joint research activities between the German Aerospace Center (DLR) and the Technical University of Braunschweig (TU BS) in the field of low-noise aircraft design. The joint research was initiated around 2008 between the DLR Institute of Aerodynamics and Flow Technology and the Institute of Aircraft Design and Lightweight Structures at TU BS. Around that time, DLR was developing a first version of an aircraft noise prediction tool. This tool has then consequently been implemented as a module into the aircraft design synthesis code of the TU BS. In 2012, for the first time, a fully automated and fully parametric aircraft design process with integrated noise prediction capabilities was established, i.e., including a full approach and departure flight simulation. The main focus lies on conventional tube-and-wing aircraft with turbofan or turboprop engine concepts. Ever since 2012, the tools have been under constant development and the simulation chain for low-noise aircraft design has been applied to various aircraft concepts. This article is comprised of a description of the tool development from 2008 until early 2018 and a selected application example. Some lessons learned and a brief outlook on future developments and applications conclude this review.

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“…72 Based on this work and other research activities 73 in the context of aircraft noise, DLR has initiated their own uncertainty assessment for conventional transport aircraft. 74 Three sources of uncertainty are accounted for, i.e. the input data uncertainty, the noise modelling uncertainty, and the propagation uncertainty.…”

Section: System Noise Uncertainty Assessmentmentioning

confidence: 99%

Aircraft and technology for low noise short take-off and landing

Delfs

Appel

Bernicke

et al. 2017

35th AIAA Applied Aerodynamics Conference

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This paper discusses characteristic multidisciplinary issues related to quiet short takeoff and landing for civil transport aircraft with a typical short to medium range mission. The work reported here is focussing on the noise aspects and is embedded in the collaborative research centre CRC880 in Braunschweig, Germany. This long term aircraft research initiative focusses on a new transport aircraft segment for operation on airports with shorter runway length in commercial air transport. This calls for a community-friendly aircraft designed for operations much closer to the home of its passengers than today. This scenario sets challenging, seemingly contradictory aircraft technology requirements, namely those for extreme lift augmentation at low noise. The Research Centre CRC880 has therefore devised a range of technology projects that aim at significant noise reductions and at the generation of efficient and flexible high lift. The research also addresses flight dynamics of aircraft at takeoff and landing. Two companion papers, reporting about the research in the field of "Efficient high lift" 1 and "Flight dynamics" 2 complete the presentation of the CRC880. It is envisaged that in general significant noise reduction-compared to a reference turbofan driven aircraft of year 2000 technology-necessarily requires component noise reduction in combination with a low noise a/c concept. Results are presented from all the acoustics related projects of CRC880 which cover the aeroacoustic simulation of the source noise reduction by flow permeable materials, the characterization, development, manufacturing and operation of (porous) materials especially tailored to aeroacoustics, new UHBR turbofan arrangements for minimum exterior noise due to acoustic shielding as well as the prediction of jet noise vibration excitation of cabin noise by UHBR engines compared to conventional turbofans at cruise.

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Uncertainty Analysis for Parametric Aircraft System Noise Prediction

Cited by 28 publications

References 21 publications

The Aircraft Noise Simulation Working Group (ANSWr) - Tool Benchmark and Reference Aircraft Results

The Aircraft Noise Simulation Working Group (ANSWr) - Tool Benchmark and Reference Aircraft Results

10 years of joint research at DLR and TU Braunschweig toward low-noise aircraft design-what did we achieve?

Aircraft and technology for low noise short take-off and landing

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