Results 11 to 20 of about 39,732 (296)
Aerodynamic Performance of a Coaxial Hex-Rotor MAV in Hover
Aerospace, 2021 Micro aerial vehicles (MAVs) usually suffer from several challenges, not least of which are unsatisfactory hover efficiency and limited fly time. This paper discusses the aerodynamic characteristics of a novel Hex-rotor MAV with a coaxial rotor capable ...
Yao Lei, Jiading Wang, Wenjie Yang
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Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan
International Journal of Aerospace Engineering, 2019 Because of the potential technical advantages, the contra-rotation technology has become a renewed interest in aviation and other applications. Contra-rotation increases efficiency in comparison with the single-rotor design, but this advantage is not ...
Hengxuan Luan +4 more
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Kicked rotor in Wigner phase space [PDF]
Fortschritte der Physik, 2003 AbstractWe develop the Wigner phase space representation of a kicked particle for an arbitrary but periodic kicking potential. We use this formalism to illustrate quantum resonances and anti‐resonances.
Bienert, M. +3 more
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Kicked-rotor quantum resonances in position space [PDF]
Physical Review A, 2008 5 figures, format RevTeX ...
Lepers, Maxence +2 more
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Intelligent Early Fault Diagnosis of Space Flywheel Rotor System
Sensors, 2023 Three frequently encountered problems—a variety of fault types, data with insufficient labels, and missing fault types—are the common challenges in the early fault diagnosis of space flywheel rotor systems. Focusing on the above issues, this paper proposes an intelligent early fault diagnosis method based on the multi-channel convolutional neural ...
Hui Liao +3 more
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Optimization of aerodynamic performance for co-axial rotors with different rotor spacings [PDF]
International Journal of Micro Air Vehicles, 2018 In this article, attempts are made to study the aerodynamic performance of co-axial rotors with different rotor spacings in hover. A custom-designed experimental platform with seven rotor spacings ( z/D = 0.16, 0.19, 0.23, 0.26, 0.29, 0.33 and 0.38) is applied to measure the hover performance, i.e.
Yao Lei, Yuxia Ji, Changwei Wang
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New inequalities for rotor frames in Hilbert space [PDF]
Journal of Mathematical Inequalities, 2020 Authors study the rotor frames in a Hilbert space. They use the rotation operator and establish an identity in case of a Weyl-Heisenberg frame. They provide a characterization of such a frame using the rotation operator and a reconstruction technique of a signal is provided too.
Pillai, K. Raju, Palaniammal, S.
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Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan. [PDF]
PLoS ONE, 2018 This paper describes the investigations performed to better understand unsteady effect that develop in a contra-rotating axial fan. More specifically, this study focuses on rotor-rotor interactions effects on unsteady characteristic and blade aerodynamic
Hengxuan Luan +2 more
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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
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Rigid rotor in phase space [PDF]
Physical Review A, 2001 Angular momentum is important concept in physics, and its phase space properties are important in various applications. In this work phase space analysis of the angular momentum is made from its classical definition, and by imposing uncertainty principle its quantum properties are obtained.
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