Results 191 to 200 of about 1,019,352 (234)
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Effect of a soccer ball’s surface texture on its aerodynamics and trajectory
Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, 2018The effect of a soccer ball’s surface texture on its aerodynamics and flight trajectory is not definitively known. For this study, five soccer balls were used, each having 32 panels with different surface textures.
Sungchan Hong, J. Goff, T. Asai
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IET Control Theory & Applications
To recover steady, straight‐level flight of a high‐angle‐of‐attack aircraft from its oscillatory spin, a MIMO super‐twisting sliding control approach is proposed in this study.
Ahmad Bagheri, Mohammad Danesh
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To recover steady, straight‐level flight of a high‐angle‐of‐attack aircraft from its oscillatory spin, a MIMO super‐twisting sliding control approach is proposed in this study.
Ahmad Bagheri, Mohammad Danesh
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Aerodynamic characteristics of a spinning projectile with elastic deformation
Aerospace Science and Technology, 2016Abstract The elastic deformation of a spinning projectile with a large slenderness ratio influences its flight stability and maneuverability. Unsteady time-accurate simulation based on a dual-time stepping method and the dynamic mesh method were used to solve the unsteady Reynolds-averaged Navier–Stokes (URANS) equations and obtain the aerodynamic ...
Juanmian Lei +3 more
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IEEE Conference on Decision and Control, 2018
This article proposes a methodology for estimating the velocity (w.r.t the air) of a high-velocity flying shell from low-cost embedded sensors. The novelty is to exploit aerodynamics models in combination with a frequency detection approach, through a ...
Aurélien Fiot +3 more
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This article proposes a methodology for estimating the velocity (w.r.t the air) of a high-velocity flying shell from low-cost embedded sensors. The novelty is to exploit aerodynamics models in combination with a frequency detection approach, through a ...
Aurélien Fiot +3 more
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Aerodynamic characteristics of a dual-spin projectile with canards
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2019Based on the three-dimensional Navier–Stokes (N–S) equations, using unsteady numerical technology, flow over a dual-spin projectile was simulated to investigate its aerodynamic characteristics during flight. Spin was achieved via the sliding mesh method.
Xiaodong Liu, Xiaosheng Wu, Jintao Yin
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EFFECT OF SKIRT ANGLE AND FEATHERS FORMATION ON SHUTTLECOCK AERODYNAMICS PERFORMANCE
, 2015Aerodynamic characteristics of badminton shuttlecock are significantly different from balls used in other sports. Shuttlecock can achieve a very high initial speed and at the same time, it can decelerate very fast.
T. M. Jahi +2 more
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Wind Tunnel Testing of Wings in Spin
, 2016Experimental wind tunnel tests were conducted in the University of Illinois at Urbana-Champaign lowspeed low-turbulence wind tunnel to study the aerodynamics of stalled spinning wings.
Adam M. Ragheb, M. Selig
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Estimation of aerodynamic forces and moments on a steadily spinning airplane
Journal of Aircraft, 1984A semiempirical method is presented for the estimation of aerodynamic forces and moments on a steadily rotating airplane model in a spin tunnel. The approach is based on the application of strip theory to determine a part of the aerodynamic coefficient (including rotational velocity) and then estimation of increments to these coefficients because of ...
PAMADI, BN, TAYLOR, LW
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A study of spin effects on tennis ball aerodynamics
Due to complex surface structure, the aerodynamic behaviour of a tennis ball is significantly different compared to other sports balls. This difference is more obvious when spin is involved. Although several studies have been conducted on drag and lift in steady state condition (no spin involved) by the authors and others, little or no studies have ...Alam, Firoz +4 more
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Aerodynamics of a Spinning Cylinder in Rarefied Gas Flows
Journal of Spacecraft and Rockets, 1999Fig. 3 Variation of wnorm with jointe exibility parameter A Fj for a)root impulse and b ) tip impulse. disturbance structurally more critical than a control impulse of the same magnitude. Conclusions The present study has investigated the problem of the elastic response ofa genericspacevehiclewithdegradedjoints.Thesteppedbeamformulation ...
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