Results 1 to 10 of about 14,828 (260)
Parameter Analysis of Active Flap Control for Rotor Aerodynamic Control and Design
International Journal of Aerospace Engineering, 2023 Active rotor control of helicopters is the future development direction, and active flap control (AFC) is one of the most promising technologies. However, the numerical simulation of an AFC rotor is challenging.
Runze Xia +3 more
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Fractal and Fractional, 2021 The wear problems are vital to the planetary roller screw mechanism (PRSM) as they have a great influence on transmission accuracy, working efficiency, and service life.
Junjie Meng +5 more
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A tale of two helicopters [PDF]
Proceedings 2003 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2003) (Cat. No.03CH37453), 2004 This paper discusses similarities and differences in autonomous helicopters developed at USC and CSIRO. The most significant differences are in the accuracy and sample rate of the sensor systems used for control. The USC vehicle, like a number of others, makes use of a sensor suite that costs an order of magnitude more than the vehicle.
Srikanth Saripalli +4 more
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Lubricants, 2022 Misalignments are unavoidable in most applications of the planetary roller screw mechanism (PRSM) due to many potential causes. However, the effect of screw misalignments on the contact characteristics for the PRSM have not been thoroughly investigated ...
Junjie Meng +5 more
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Research progress of helicopter noise suppression technology based on materials/structures
Journal of Aeronautical Materials, 2022 Helicopter has achieved rapid development and wide application in various fields, due to its unique flight mode. However, the noise is also a particular feature of the helicopter, which people cannot bear without protection.
LI Wenzhi, CAO Yaoqin, HE Zhiping
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, 2020 The aim of this study is to validate the Italian version of the Helicopter Parenting Instrument (HPI), a self-report instrument that evaluate adolescents’ and young adults’ perception of parenting behaviors. The term helicopter parenting describes a style of child-rearing characterized by parents who are over-involved in every aspect of their children ...
Pistella, J +4 more
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Xibei Gongye Daxue XuebaoThe numerical calculation model for the aero-acoustic analysis of a tilt rotor was established by combining the free wake method and the FW-H (Ffowcs Williams-Hawkings) equation.
YUAN Mingchuan +4 more
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Xibei Gongye Daxue XuebaoTo investigate the impact of the aerodynamic interference among multirotors on the characteristics of vortex rings and their underlying mechanisms, a combination of detached eddy simulation (DES) and overset grid methods to simulate the unsteady ...
LI Yinhan +4 more
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Analysis of aerodynamic characteristics of helicopter biplane tailplane
Xibei Gongye Daxue XuebaoTo analyze the aerodynamic characteristics of helicopter biplane tailplane, computational models for helicopter biplane tailplane and monoplane tailplane were established via CFD.
SUN Huixun +5 more
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Trajectory Planning and Robustness Analysis for Mars Helicopters Under Uncertain Wind Fields
MachinesWind disturbances in the thin Martian are highly stochastic and spatially correlated, posing significant challenges to rotorcraft flight safety. Meanwhile, limited onboard computational resources make real-time safe trajectory planning difficult.
Chaoqun Zhang +4 more
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