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Article
Acoustics
Thierry Jardin et al.
Summary: We compare numerical simulations and experiments on small scale rotors for Unmanned Aircraft Systems (UAS) and find that numerical approaches provide reasonable estimates of aerodynamic performance and tonal noise. We investigate the influence of solidity ratio on aerodynamics and acoustics of small scale rotors under hovering and iso-thrust conditions. Results show that solidity ratio has a weak impact on aerodynamic performance but can significantly reduce farfield tonal noise, depending on the interaction between thickness and loading noise.
INTERNATIONAL JOURNAL OF AEROACOUSTICS
(2023)
Article
Engineering, Aerospace
Edoardo Grande et al.
Summary: This paper presents an experimental investigation of a propeller operating at low Reynolds numbers and provides insights into the role of aerodynamic flow features on both propeller performances and noise generation. The results reveal a complex flowfield with the appearance of a laminar separation bubble at the suction side of the blade, and the influence of the advance ratio and the separation bubble on the noise spectra.
Article
Chemistry, Multidisciplinary
Caterina Poggi et al.
Summary: This paper presents a numerical investigation of noise radiated by two side-by-side propellers, focusing on the effects of blade tip Mach number, rotation direction, hub relative position, and relative phase angle on the radiated noise. The study shows that the blade tip Mach number strongly influences the magnitude and directivity of the radiated noise, while increasing tip-clearance increases the spatial frequency of noise directivity. Additionally, for counter-rotating propellers, the relative phase angle between the blades decreases the average emitted noise.
APPLIED SCIENCES-BASEL
(2022)
Article
Acoustics
Hanbo Jiang et al.
Summary: This paper investigates the radiation modes and efficiency of propeller tonal noise, formulating models in spherical coordinates. By decomposing the radiation field into spherical harmonics, the analysis can be conducted on sound field structures. The proposed model mathematically explains how thrusts only produce antisymmetric sound waves with respect to the rotating plane, and the decay of radiation efficiency as noise sources approach the rotating center.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Aerospace
A. Filippone et al.
Summary: Urban air vehicles are seen as the next revolution in aviation, with prototypes of various sizes demonstrating basic flight capabilities. However, many technical issues remain unsolved and startups are seeking funding while large aerospace companies are also getting involved. These initiatives are fueling high expectations for achieving the next milestone in urban air transportation.
AERONAUTICAL JOURNAL
(2021)
Article
Acoustics
Dongwook Kim et al.
Summary: This study quantifies and predicts the effects of the variation in the angular speed of each rotor on the noise of a hovering multirotor through uncertainty quantification and single-rotor stochastic analysis, showing similar spectral characteristics between single-rotor noise and multirotor noise.
Article
Acoustics
Wangqiao Chen et al.
Summary: Observations indicate that random pulsations inside shear layers can suppress aerodynamic noise and benefit aeroacoustic designs by reducing tip vortex. The proposed phase-averaged beamforming method enables powerful time frequency analysis in acoustic imaging tests, providing deep physical insights into transient fluid mechanics in underwater and aerospace systems.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Aerospace
Damiano Casalino et al.
Summary: Experimental and numerical results of a low Reynolds number propeller are presented as a preliminary step towards defining a benchmark configuration for low Reynolds number propeller aeroacoustics. The study identifies the experimental and numerical challenges of the benchmark and the relevance of fundamental research questions related to transition and other low Reynolds number effects.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Acoustics
Ryan S. McKay et al.
Summary: Contra-rotating propellers can improve the efficiency and lifting capacity of multi-rotor UAVs, but they can also generate significant noise levels. This study investigated the noise from static contra-rotating UAV propellers in an anechoic chamber, focusing on interaction tones as the main contributor to noise level. The study presented a theoretical model for far-field interaction tone noise, and found that using propellers with mismatched blade numbers could help reduce noise levels.
Article
Acoustics
Romain Gojon et al.
Summary: This study experimentally characterises low Reynolds number rotors in an anechoic room, investigating the noise characteristics of rotors with different numbers of blades. The results show that all noise characteristics increase with rotational speed, and the amplitudes of BPF and its first harmonic are minimal at low rpm and/or high number of blades, while maximal at high rpm and/or low number of blades.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Mechanics
Jie Gong et al.
Summary: The study focuses on investigating the wake dynamics of a ducted propeller using detached eddy simulations, revealing the impacts of blade-blade interference and blade-duct interaction on loading stability and efficiency. Short-wave instability governs the wake, with multi-induction effects and duct characteristics influencing the tip vortex system differently.
Article
Environmental Sciences
C. T. Justine Hui et al.
Summary: The study evaluated the human perception of noise produced by four different small quadcopter UAVs and found a strong correlation between annoyance levels and sound pressure level. There was also a significant correlation between annoyance caused by UAVs in hover and flyby at the same height. However, the results of the cognitive distraction test were inconclusive due to a ceiling effect observed in the participants' test scores.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Engineering, Aerospace
Y. Yang et al.
Article
Acoustics
Yannian Yang et al.
JOURNAL OF SOUND AND VIBRATION
(2020)
Article
Multidisciplinary Sciences
Siyang Zhong et al.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2020)
Article
Engineering, Aerospace
Sicheng (Kevin) Li et al.
JOURNAL OF THE AMERICAN HELICOPTER SOCIETY
(2020)
Article
Acoustics
David B. Stephens et al.
JOURNAL OF SOUND AND VIBRATION
(2014)
