Towards predicting noise-power-distance curves for propeller and rotor powered aircraft

Amargianitakis, DC; Self, RH; Proenca, Anderson; Synodinos, Athanasios P.; Martinez, AJ Torija

doi:10.3397/in-2021-2555

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…On an aircraft level, assessment of individual noise source directivity effects on noise contours, allows the exploration of engine installation, reflection and blockage effects to maximise the potential benefits on noise exposure. The incorporation of directivity effects may then be coupled with models for generating NPD curves for novel aircraft [32,33] that would provide the necessary PWL inputs for RANE v2, to provide global assessment of the noise impact of new technology and/or implementation of noise abatement operational procedures.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

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

et al. 2023

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“…Previously mentioned airport noise tools may then be used to assess the noise on the ground due to UAV single operation or even fleet operation over the duration of a full day for example. In combination with the capabilities of generating NPDs for propeller power air vehicles [3], and the airport noise tool RANE v2 [4], the global assessment of noise exposure of such UAV networks.…”

Section: Introductionmentioning

confidence: 99%

“…Although reference data for full scale transport aircraft is publicly available through databases such as the Aircraft Noise and Performance (ANP) database [5], NPD data for small scale drones is either scarce or nonexistent. Previously developed frameworks [6], [3] that predict the noise of novel aircraft as functions of changes in aircraft design technology and/or operations require knowledge of baseline noise data for a reference aircraft of similar performance and scale. Overturning the lack of this data is the major contribution of this ongoing research.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Modelling of Noise-Power-Distance Curves of a Fixed-Wing UAV

Amargianitakis

Self

Proenca

et al. 2022

28th AIAA/CEAS Aeroacoustics 2022 Conference

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This paper presents an investigation into the noise produced by an unmanned aerial vehicle (UAV). The platform used, 'Spotter', is a fixed-wing, light UAV comprising a 4-meter wingspan. Spotter was originally designed to perform long-endurance, all-weather patrol missions in coastal and maritime environments. This vehicle has been continuously upgraded and is now used in a broader range of applications. Increasing demand by research and industrial partners, as well as the UK Civil Certification Authority (CAA) has led to a survey of the Spotter's in-flight noise footprint. The CAA Operating Safety Case of this platform is currently being updated and the major findings are presented in the paper. Preliminary results were obtained in flight tests performed at the Draycot Aerodrome over two expeditions in the summer of 2021, in the UK. A series of flyovers, takeoff and landing operations were measured. Flyovers were performed at constant altitude at series of power settings, incrementing from low to maximum power output. These measurements are then used to generate Noise-Power-Distance curves for the Spotter UAV. Static directivity characteristics of the dual propeller setup were also measured, with intent of feeding into future airport exposure studies.

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Towards predicting noise-power-distance curves for propeller and rotor powered aircraft

Cited by 2 publications

References 12 publications

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

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

Measurement and Modelling of Noise-Power-Distance Curves of a Fixed-Wing UAV

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