Trajectories reconstruction of spinning baseball pitches by three-point-based algorithm

Aguirre-Lpez, Mario A.; Morales-Castillo, Javier; Daz-Hernndez, O.; Santos, Gerardo J. Escalera; Almaguer, F-Javier

doi:10.1016/j.amc.2017.01.016

Cited by 5 publications

(10 citation statements)

References 13 publications

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“…The rotating sphere (4) and cylinder have been the primary cases considered in previous literature relating to the aerodynamics of rotating bodies and their subsequent trajectories (10) . It is hoped that the initial stages of the present study will help to form a reliable basis to delve into greater irregularity in the shapes tested, an area that has not been investigated in the background literature.…”

Section: Previous Experimental Methodsmentioning

confidence: 99%

“…Many sports balls which spin whilst travelling through the air, such as golf balls (16) , baseballs (10) , cricket balls or footballs (17), present the 'curveball' phenomenon; a bending of the ball's flight path. The relative velocity of the ball's surface with respect to the flow causes an acceleration of separation on the side of the ball moving upstream.…”

Section: Magnus Effectmentioning

confidence: 99%

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Experimental determination of the aerodynamic coefficients of spinning bodies

Nguyen¹,

Corey²,

Chan³

et al. 2019

Aeronaut. j.

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To accurately predict the probabilities of impact damage to aircraft from runway debris, it is important to understand and quantify the aerodynamic forces that contribute to runway debris lofting. These lift and drag forces were therefore measured in experiments with various bodies spun over a range of angular velocities and Reynolds numbers. For a smooth sphere, the Magnus effect was observed for ratios of spin speed to flow speed between 0.3 and 0.4, but a negative Magnus force was observed at high Reynolds numbers as a transitional boundary layer region was approached. Similar relationships between lift and spin rate were found for both cube- and cylinder-shaped test objects, particularly with a ratio of spin speed to flow speed above 0.3, which suggested comparable separation patterns between rapidly spinning cubes and cylinders. A tumbling smooth ellipsoid had aerodynamic characteristics similar to that of a smooth sphere at a high spin rate. Surface roughness in the form of attached sandpaper increased the average lift on the cylinder by 24%, and approximately doubled the lift acting on the ellipsoid in both rolling and tumbling configurations.

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Section: Previous Experimental Methodsmentioning

confidence: 99%

Section: Magnus Effectmentioning

confidence: 99%

Experimental determination of the aerodynamic coefficients of spinning bodies

Nguyen¹,

Corey²,

Chan³

et al. 2019

Aeronaut. j.

View full text Add to dashboard Cite

show abstract

“…In fact, for any viewer, the expected direction of the ball's deflection goes on (ω × V), FIGURE 2 | Model of drag and Magnus coefficients. Adair's drag model [7] and the approximation of Aguirre-López et al [5] showing the sigmoidal decreasing of drag when increasing the velocity of the ball. In turn, the Magnus model (10) presented in Robinson [8] shows that the Magnus coefficient increases when the angular velocity increases.…”

Section: The Magnus Forcementioning

confidence: 99%

“…In turn, the Magnus model (10) presented in Robinson [8] shows that the Magnus coefficient increases when the angular velocity increases. Modified from Aguirre-López et al [5].…”

Section: The Magnus Forcementioning

confidence: 99%

“…Among body force gravity, Coriolis and centrifugal forces can be found, whereas the forces generated at the ball-air boundary include pressure, normal and shear stress, etc. In spite of gravity, body forces are weak and are commonly neglected in calculations of ball sports as reported in calculations by Robinson and Robinson [4] and Aguirre-López et al [5]. On the other hand, the surface forces can be classified according to the direction and nature of their origin: drag, Magnus, lift, side and other forces [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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