Results 1 to 10 of about 14,829 (161)
Investigation on Aerodynamic Noise Characteristics of Coaxial Rotor in Hover
Applied Sciences, 2022 A numerical method based on Reynolds Averaged Navier–Stokes (RANS) equations and a high-efficiency trim model is developed to simulate the aerodynamics of a coaxial rotor.
Haotian Qi +3 more
doaj +3 more sources
A revisit of the tonal noise of small rotors [PDF]
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2020 In this study, asymptotic analysis of the frequency-domain formulation to compute the tonal noise of the small rotors in the now ubiquitously multi-rotor powered drones is conducted. Simple scaling laws are proposed to evaluate the impacts of the influential parameters such as blade number, flow speed, rotation speed, unsteady motion, thrust and ...
Siyang Zhong, Xin Zhang, Peng Zhou
exaly +5 more sources
Hybrid Rotor Noise Optimization
Engineering ProceedingsThis study examines noise reduction strategies for unmanned aerial vehicles (UAVs) in urban air mobility applications, with a particular focus on package delivery.
Philipp Mandl +3 more
doaj +3 more sources
Psychoacoustic modelling of rotor noise [PDF]
The Journal of the Acoustical Society of America, 2022 The aviation sector is rapidly evolving with more electric propulsion systems and a variety of new technologies of vertical take-off and landing manned and unmanned aerial vehicles. Community noise impact is one of the main barriers for the wider adoption of these new vehicles.
Torija Martinez, AJ, Li, Z, Chaitanya, P
openaire +4 more sources
A New Squirrel Cage Rotor Structure to Improve the Dynamic Performance of the Single Phase Induction Motor [PDF]
International Journal of Industrial Electronics, Control and Optimization, 2022 Audible noise radiated by electrical machines is gaining more and more importance in the design process of electrical machines. The radial electromagnetic forces in induction motors play an important role in the production of audible noise and vibrations.
Hamed Shadfar, Hamid Reza Izadfar
doaj +1 more source
Methods for Attenuation of Helicopter [PDF]
فناوری در مهندسی هوافضا, 2023 Helicopters can be a source of loud noise. The high production noise of helicopters makes them unsuitable for densely populated areas, especially in low-flying conditions.
Hamid Parhizkar +2 more
doaj +1 more source
Fluids, 2022 The aim of the present manuscript is to investigate the noise footprint of an isolated propeller in different flight configurations for the propulsion of a hybrid-electric aircraft.
Paolo Candeloro +4 more
doaj +1 more source
An Experimental Study on Rotor Aerodynamic Noise Control Based on Active Flap Control
Aerospace, 2023 Reducing rotor aerodynamic noise is an important challenge in helicopter design. Active flap control (AFC) on rotors is an effective noise reduction method.
Zhiyuan Hu +3 more
doaj +1 more source
Frontiers in Marine Science, 2023 As interest in the development of renewable energy increases, a large number of offshore wind farms are being built worldwide. Accordingly, the potential impacts of underwater operational noise on marine ecosystems have become an issue, and thus it is ...
Young Geul Yoon +3 more
doaj +1 more source
Fluids, 2022 In the last decade, the drone market has grown rapidly for both civil and military purposes. Due to their versatility, the demand for drones is constantly increasing, with several industrial players joining the venture to transfer urban mobility to the ...
Paolo Candeloro +2 more
doaj +1 more source