2024-03-29T00:36:09Z
https://zenodo.org/oai2d
oai:zenodo.org:4535123
2021-02-12T00:27:18Z
user-rumble-project-h2020
user-eu
Løvholt, Finn
Noren-Cosgriff, Karin
Park, Joonsang
Løkke, Arnkjell
2021-02-11
<p>Infrasound and audible sound at very low frequency may cause human annoyance by inducing building vibration, involving both rattling and whole body vibration sensing of humans. Here, we present results from a numerical modelling study of the very low frequency component of sonic boom and its effect on generating construction vibration conducted. The work is conducted within the H2020 RUMBLE project. The motivation is low frequency noise and sound induced vibration caused by aircrafts, in particular those from sonic boom. Results from field measurements conducted prior to RUMBLE is combined with sonic boom signals to give a first estimate of potential magnitude of boom induced vibrations. Then a Finite Element (FE) model developed in COMSOL Multiphysics is used to simulate the low frequency sound transmission loss for one lightweight structure and one concrete wall. Secondly, the floor construction is added for simulating the floor vibration. Furthermore, we discuss possible generalizations, such as changing room configuration, wall types, high rise buildings etc. An outline for a review of the acoustic properties for different construction types are also given. Altogether, we discuss how the interplay between the various elements discussed above can be combined to better quantify sonic boom induced building vibration.</p>
https://doi.org/10.5281/zenodo.4535123
oai:zenodo.org:4535123
eng
Zenodo
http://www.sea-acustica.es/fileadmin/INTERNOISE_2019/Fchrs/Proceedings/1634.pdf
https://zenodo.org/communities/rumble-project-h2020
https://zenodo.org/communities/eu
https://doi.org/10.5281/zenodo.4535122
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
Sonic boom; vibration; transmission loss; numerical modelling
Numerical modelling of very low frequency sound transmission loss through walls from sonic boom
info:eu-repo/semantics/conferencePaper
oai:zenodo.org:4535203
2021-02-12T00:27:18Z
user-rumble-project-h2020
user-eu
J. Kirz
2020-09-03
<p>This paper presents the setup of the DLR TAU code for sonic boom near-field simulations and results obtained for the low-boom geometries developed within the EC project RUMBLE. A process for surrogatebased low-boom low-drag fuselage design based on a near-field target pressure signature is described. The focus of the paper is the robust parameterization of the fuselage geometry to prevent the generation of irregular shapes as well as the modular grid generation approach that significantly reduces the time to generate the grids. The numerical results of four RUMBLE milestone shape evolutions with flow through nacelles are presented and geometrical influences on the near-field pressure signatures are analyzed. It is shown that the pressure signatures for shape derivatives with powered engine boundary conditions or with modifications for wind tunnel measurements are very similar to the signatures of the original shapes.</p>
https://doi.org/10.5281/zenodo.4535203
oai:zenodo.org:4535203
Zenodo
https://zenodo.org/communities/rumble-project-h2020
https://zenodo.org/communities/eu
https://doi.org/10.5281/zenodo.4535202
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
NUMERICAL NEAR-FIELD SIMULATIONS OF LOW BOOM AIRCRAFT CONCEPTS
info:eu-repo/semantics/conferencePaper
oai:zenodo.org:4246729
2021-02-12T15:58:30Z
user-rumble-project-h2020
user-eu
Töpken, Stephan
van de Par, Steven
2020-03-16
<p>Supersonic aircraft produce a sonic boom when flying faster than the speed of sound. In order to rule out detrimental<br>
e ects for inhabitants of overflown areas, civil supersonic flights (like the Concorde) were allowed to fly over water only.<br>
Due to progress in aircraft design, the super sonic boom may be reduced considerably in the future. Such ”Low Sonic<br>
Boom”-signatures will be considerably quieter and sound completely di erent compared to conventional sonic booms.<br>
Currently, the sensation and the subjective response of humans to future ”Low Sonic Boom”-signatures is not known.<br>
For an assessment of human responses to ”Low Sonic Boom”-signatures, a Sonic-Boom simulator has been built at the<br>
University of Oldenburg as a pressure chamber with a volume of about 9 m<sup>3</sup>. Two 18” loudspeaker chassis enable the<br>
production of an overpressure of up to 20 Pa for a signature duration of 200 ms. The background noise level in the<br>
chamber is very low (21 dB(A)) and the chamber has a very small reverberation time of T<sub>20</sub>=0.2 s averaged over octave<br>
bands from 63 Hz to 8 kHz. A vibration platform is installed in the chamber to simulate whole-body vibration that may<br>
occur in connection with ”Low Sonic Boom”-signatures.</p>
https://doi.org/10.5281/zenodo.4246729
oai:zenodo.org:4246729
eng
DEGA e.V.
https://zenodo.org/communities/rumble-project-h2020
https://zenodo.org/communities/eu
https://doi.org/10.5281/zenodo.4246728
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
DAGA 2020, Hannover, Germany, 16-19 March 2020
Sonic Boom
Low Frequency
Simulator
Pressure Chamber
Simulator for the reproduction of "Low Sonic Boom"-signatures
info:eu-repo/semantics/conferencePaper
oai:zenodo.org:4535167
2021-02-12T00:27:18Z
user-rumble-project-h2020
user-eu
Stephan Großarth
Dirk Schreckenberg
Nico van Oosten
Luis Meliveo
2020-04-01
<p>Legal bans prohibit over land supersonic flights for any commercial aircraft. Those restrictions, aimed at decreasing noise annoyance on residents living along the flight path, have made supersonic commercial air traffic unprofitable, which resulted in the abandonment of the last supersonic passenger aircrafts in 2003. In recent years however, aviation industry has started to redesign supersonic aircrafts aiming at producing considerable less adverse noise impacts than former supersonic flights. The new way of surpassing the Mach 1 border has since become known as “low sonic boom” or “sonic thump”. For several years, simulation and laboratory studies have been carried out to estimate human responses to low sonic boom. In Galveston, Texas, NASA conducted a community response study to quiet supersonic boom produced by special supersonic F18 flight manoeuvres (diving) over sea. However, so far no field study exists that has tested the impact of low supersonic flights en route on the population underneath. The EU Horizon 2020 project RUMBLE (RegUlation and norM for low sonic Boom LEvels) aims at producing scientific evidence to determine the acceptable level of overland sonic booms and the appropriate ways to comply with it. For this, as part of the RUMBLE project experimental indoor and outdoor studies on human responses to sonic boom are carried out. The results of these studies together with an extensive review of existing scientific evidence on methodologies of noise impact research and results on human responses to subsonic and supersonic aircraft noise are collected to derive recommendations for a field study on human responses to supersonic flights en route. In this contribution, first ideas for a design of such a field study with regard to the noise effect assessment are discussed.</p>
https://doi.org/10.5281/zenodo.4535167
oai:zenodo.org:4535167
aig
Zenodo
https://zenodo.org/communities/rumble-project-h2020
https://zenodo.org/communities/eu
https://doi.org/10.5281/zenodo.4535166
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
Psychological assessment of noise annoyance due to low sonic boom
info:eu-repo/semantics/conferencePaper