Noise Exposure Maps for Urban Air Mobility

Li, Jinhua; Ng, Hok K.; Zheng, Yun; Gutierrez-Nolasco, Sebastian

doi:10.2514/6.2021-3203

Cited by 2 publications

(1 citation statement)

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“…which succeeds the FAA's original INM (Integrated Noise Model). NASA is currently working on expanding the capability of AEDT to UAM and AMM vehicles [22,23] and in the process developing a suite of tools capable of characterising individual sources using high-fidelity CFD or analytical codes (e.g., PSU-WOPWOP [24,25]) all the way to generating noise exposure contours. European tools that implement grid-point methodology are Eurocontrol's IMPACT [26] and STAPES (SysTem for AirPort noise Exposure Studies), and the UK CAA's ANCON2 [13] based on the original ANCON model.…”

Section: A Conventional Grid-point Modelsmentioning

confidence: 99%

Closed-Form Analytical Approach for Calculating Noise Contours of Directive Aircraft Noise Sources

et al. 2023

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This paper extends the simplified airport noise model Rapid Aviation Noise Evaluator (RANE) [Torija et al., Journal of the Acoustical Society of America, Vol. 141, No. 2, 2017, pp. 981–995], adding capability of including fully nonisotropic noise sources. This extended tool, RANE v2, is developed as a part of multidisciplinary acoustic assessment of novel aircraft, in order to produce ground contours around airports and helipads. Version 2 extends the capability of RANE to accommodate predictions of future air vehicles implementing propulsion systems solution with inherent directional properties. The model uses three-dimensional noise emission surfaces around a series of discretized segments that represent the aircraft flightpath. The main inputs are the sources’ sound power level, the distance from the flightpath at which a level is observed, and the source three-dimensional directivity. The directivity function may take analytical or numerical form, allowing for experimental data inputs. This paper demonstrates the use of spherical harmonics as a form of directivity function with a closed-form analytical solution for calculating the noise exposure contours. Results and comparison against the Federal Aviation Administration’s Aviation Environmental Design Tool module for helicopter community noise indicate that exposure contour coordinates can be estimated for high and low noise exposure levels. The incorporation of source directivity allows for the assessment of lateral attenuation, engine installation effects, and transition operations (for vertical to horizontal flight and vice versa) via the assumption of individual source directivities and, therefore, complex noise surfaces. As a consequence of the analytical nature of the model, low computational requirements allow for fast exploration of the design space and parametric studies, with minimal input requirements. The capabilities of RANE v2 are demonstrated by predicting noise footprints for three helicopters, each of different size, performance, and directivity characteristics.

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Section: A Conventional Grid-point Modelsmentioning

confidence: 99%