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Three-dimensional simulation for fast forward flight of a calliope hummingbird [PDF]
Royal Society Open Science, 2016 We present a computational study of flapping-wing aerodynamics of a calliope hummingbird (Selasphorus calliope) during fast forward flight. Three-dimensional wing kinematics were incorporated into the model by extracting time-dependent wing position from
Jialei Song +4 more
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Computational investigation of cicada aerodynamics in forward flight. [PDF]
J R Soc Interface, 2015 Free forward flight of cicadas is investigated through high-speed photogrammetry, three-dimensional surface reconstruction and computational fluid dynamics simulations. We report two new vortices generated by the cicada's wide body. One is the thorax-generated vortex, which helps the downwash flow, indicating a new phenomenon of lift enhancement ...
Wan H, Dong H, Gai K.
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Heat dissipation during hovering and forward flight in hummingbirds [PDF]
Royal Society Open Science, 2015 Flying animals generate large amounts of heat, which must be dissipated to avoid overheating. In birds, heat dissipation is complicated by feathers, which cover most body surfaces and retard heat loss.
Donald R. Powers +4 more
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Forward flight stability in a drone-fly. [PDF]
Sci Rep, 2020 AbstractPrevious studies on forward flight stability in insects are for low to medium flight-speeds. In the present work, we investigated the stability problem for the full range of flight speeds (0–8.6 m/s) of a drone-fly. Our results show the following: The longitudinal derivatives due to the lateral motion are approximately 3 orders of magnitude ...
Zhu HJ, Meng XG, Sun M.
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Flight dynamic simulation of helicopter forward flight through microburst wind field [PDF]
Advances in Mechanical Engineering, 2017 A nonlinear dynamic model of a helicopter flying through a variable microburst wind field is developed. Equivalent wind field models are established based on the Soesman and gust models to analyze quantitatively the abrupt change when a helicopter enters
Tong Liu, Yuting Dai, Guanxin Hong
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Flight dynamics in forward flights of cabbage white butterfly
Journal of Fluid Science and Technology, 2023 We conducted measurements of a butterfly’s motion in forward flight and numerical simulations using a computational model reflecting its motion. We measured the motion of a cabbage white butterfly (Pieris rapae), and then we constructed a computational ...
Kosuke SUZUKI +2 more
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Simulation of Longitudinal Stability Of Helicopter In Forward Flight
Journal of Engineering, 2023 The present work describes the development of code for trim and longitudinal stability analysis of a helicopter in forward flight. In general, particular use of these codes can be made for parametric investigation of the effects of the external and ...
Kareem Jawad Kadhim +1 more
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Trajectory Tracking Based on Active Disturbance Rejection Control for Compound Unmanned Aircraft
Aerospace, 2022 The compound unmanned aircraft is provided with three primary flight modes, which are helicopter flight mode in low forward speed flight, airplane flight mode in high forward speed flight and transition flight mode in middle forward speed flight. For the
Bohai Deng, Jinfa Xu
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Conversion Flight Control for Tiltrotor Aircraft via Active Disturbance Rejection Control
Aerospace, 2022 The tiltrotor aircraft consists of three primary flight modes, which are helicopter flight mode in low forward speed flight, airplane flight mode in high forward speed flight and conversion flight mode. This paper presents an active disturbance rejection
Ke Lu +4 more
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Influence of Aerodynamic Characteristics of Airfoil Forward Flight Considering Step-Type Ground
Shanghai Jiaotong Daxue xuebao, 2023 The aerodynamic influence of ground effects during forward flight is difficult to ignore, especially when there is a sudden change in the ground structure.
XU Xiaogang, ZHANG Yang, CHANG Min, CHEN Gang
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