Optimisation of Propellers with Noise-Based Constraints Including a Deep Learning Method for Aerofoil Prediction

Pullin, Shaun F.; Zhou, Beckett Yx; Azarpeyvand, Mahdi

doi:10.2514/6.2022-3073

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…At more stringent (lower) SPL constraints there is a greater difference between the optimal propellers with a fixed profile compared to a profile that was able to change as a design variable in the optimisation. More details on these optimisation studies can be found in [5].…”

Section: A Optimisation With Tonal Acoustic Constraintsmentioning

confidence: 99%

“…They were able to include most aspects of the propeller geometry in the optimisations performed, however the sectional shape of the blade remained fixed. A previous study by the current authors [5] used BEMT and the Hanson acoustic method for a gradient based optimisation framework that included the aerofoil section by using a data-driven method to predict aerofoil performance and adjoint. In that method only the propeller tone was predicted and used as a constraint.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Optimisation of Propellers with Tonal and Broadband Aeroacoustic Constraints

Pullin

Ghiglino

Zhou

et al. 2023

AIAA AVIATION 2023 Forum

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The increased demand for sustainable aviation and the growing interest in Urban Air Mobility concepts has led to renewed interest in propeller aerodynamics and aeroacoustics. It is necessary to be able to predict the noise produced by propellers at the earliest stages of the design process. In this work, which builds on previous optimisation studies, a computationally efficient, BEMT based propeller simulation framework capable of predicting and optimising the aerodynamic and aeroacoustic performance is presented. The noise prediction provided by this tool includes both tonal and broadband components produced by the propeller. Aerofoil aerodynamics are obtained using a data-driven method, allowing for optimisation of the sectional shape alongside parameters such as chord and pitch distributions. Previous studies using this tool have found that including the aerofoil shape in the optimisation process allowed for an additional efficiency increases at high tonal constraints. This work introduces a trailing edge broadband noise model into the optimisation framework and studies the effect this has on the optimal geometry of a propeller. Optimisation of a small benchmark propeller has found significant reductions in mean broadband SPL of up to 5.18 dB while maintaining a high fraction of the baseline thrust. A study was also performed to maximise propeller efficiency while constraining broadband SPL. It was found that significant reductions in noise of up to 12 dB were possible at the cost of a 12% drop in propeller efficiency.

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Section: A Optimisation With Tonal Acoustic Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid Optimisation of Propellers with Tonal and Broadband Aeroacoustic Constraints

Pullin

Ghiglino

Zhou

et al. 2023

AIAA AVIATION 2023 Forum

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the recent developments of MAVs, MAV rotor optimizations have been carried out [64][65][66][67][68][69][70][71]. Serré et al [67] used BEMT simulations coupled with the Farassat formulation-1A and semi-empirical broadband noise models to predict hover efficiency, tonal noise, and broadband noise, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Since BEMT simulations (used in [67][68][69]) do not predict the aerodynamic blade vortex interaction and the blade-wake interaction, the need for more accurate optimizations has pushed the authors to perform multi-objective optimizations using middle fidelity, but with a relatively fast, steady non-linear vortex lattice method (S-NVLM) code [20,73] coupled to a Farassat formulation-1A code. Furthermore, the optimization process includes manufacturing and operational constraints which render present results more useful in practice.…”

Section: Introductionmentioning

confidence: 99%

Analysis of MAV Rotors Optimized for Low Noise and Aerodynamic Efficiency with Operational Constraints

Li Volsi,

Brogna,

Gojon

et al. 2024

Fluids

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The rapid growth of drone use in urban areas has prompted authorities to review airspace regulations, forcing drone manufacturers to anticipate and reduce the noise emissions during the design stage. Additionally, micro air vehicles (MAVs) are designed to be aerodynamically efficient, allowing them to fly farther, longer and safer. In this study, a steady aerodynamic code and an acoustic propagator based on the non-linear vortex lattice method (NVLM) and Farassat’s formulation-1A of the Ffowcs Williams and Hawkings (FW-H) acoustic analogy, respectively, are coupled with pymoo, a python-based optimization framework. This tool is used to perform a multi-objective (noise and aerodynamic efficiency) optimization of a 20 cm diameter two-bladed rotor under hovering conditions. From the set of optimized results, (i.e., the Pareto front), three different rotors are 3D-printed using a stereolithography (SLA) technique and tested in an anechoic room. Here, an array of far-field microphones captures the acoustic radiation and directivity of the rotor, while a balance measures the aerodynamic performance. Both the aerodynamic and aeroacoustic performance of the three different rotors, in line with what has been predicted by the numerical codes, are compared and guidelines for the design of aerodynamically and aeroacoustically efficient MAV rotors are extracted.

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Experimental investigation of propeller noise in ground effect

Hanson

Jawahar

Vemuri

et al. 2023

Journal of Sound and Vibration

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Optimisation of Propellers with Noise-Based Constraints Including a Deep Learning Method for Aerofoil Prediction

Cited by 6 publications

References 7 publications

Rapid Optimisation of Propellers with Tonal and Broadband Aeroacoustic Constraints

Rapid Optimisation of Propellers with Tonal and Broadband Aeroacoustic Constraints

Analysis of MAV Rotors Optimized for Low Noise and Aerodynamic Efficiency with Operational Constraints

Experimental investigation of propeller noise in ground effect

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