Ball flight path determination in VR table tennis

2021 ◽  
Author(s):  
Haosong Zhang ◽  
Shi Feng Lim ◽  
Feng Lin ◽  
Liyuan Li ◽  
Hock S. Seah
Keyword(s):  
Flight Path ◽  
Table Tennis ◽  
Ball Flight

How do athletes cause ball flight path deviation in high-performance interceptive ball sports? A systematic review

2021 ◽  
pp. 174795412110473
Author(s):  
Cody Lindsay ◽  
Brad Clark ◽  
Kane Middleton ◽  
Rian Crowther ◽  
Wayne Spratford
Keyword(s):  
Systematic Review ◽  
High Performance ◽  
Flight Path ◽  
Flight Trajectory ◽  
Task Constraints ◽  
Axis Of Rotation ◽  
Vertical Changes ◽  
Ball Flight ◽  
Change Task ◽  
Path Deviation

Athletes alter ball flight trajectory in interceptive ball sports to change task constraints that their opponents must overcome to successfully meet the ball in flight. This systematic review identified how athletes change their techniques to alter the ball flight trajectory in high-performance interceptive sports where the ball is projected by the hand towards an opponent. Studies that reported the kinematics or ball flight characteristics of these movements were searched for using SportsDiscus, Scopus, MEDLINE and CINAHL Plus databases up to 27 April 2021. Forty-eight articles met the inclusion criteria, including 19 baseball, 12 cricket, five handball, four softball, three volleyball and five water polo studies. Extracted data were presented as ranges and descriptively analysed to report athlete sporting actions. Trajectory deviation can be caused by imparting an altered seam orientation or spin rate and axis of rotation on the ball. Athletes impart sidespin or manipulate seam orientation to cause lateral deviation while topspin and backspin are used to create vertical changes in the flight path. Adjusting the shoulder, forearm, wrist, hand and fingers of the throwing or striking arm can be used to impart an altered seam orientation or spin rate and axis of rotation on the ball. The findings of this review could assist coaches and athletes across a variety of sports to improve the ability to deviate the ball during flight.

Studies and simulations on the flight trajectories of spinning table tennis ball via high-speed camera vision tracking system

2018 ◽  
Vol 233 (2) ◽  
pp. 210-226 ◽  
Author(s):  
Ping Wang ◽  
Qian Zhang ◽  
Yinli Jin ◽  
Feng Ru
Keyword(s):  
High Speed ◽  
Tracking System ◽  
Tennis Ball ◽  
Table Tennis ◽  
Flight Trajectory ◽  
Tennis Players ◽  
Simulated Trajectory ◽  
Ideal Tool ◽  
Ball Flight ◽  
Actual Trajectory

When a table tennis ball is hit by a racket, the ball spins and undergoes a complex trajectory in the air. In this article, a model of a spinning ball is proposed for simulating and predicting the ball flight trajectory including the topspin, backspin, rightward spin, leftward spin, and combined spin. The actual trajectory and rotational motion of a flying ball are captured by three high-speed cameras and then reconstructed using a modified vision tracking algorithm. For the purpose of model validation, the simulated trajectory is compared to the reconstructed trajectory, resulting in a deviation of only 2.42%. Such high modeling accuracy makes this proposed method an ideal tool for developing the virtual vision systems emulating the games that can be used to train table tennis players efficiently.

Cognitive Factors Mediate the Relation Between Age and Flight Path Maintenance in General Aviation

2016 ◽  
Vol 6 (2) ◽  
pp. 81-90 ◽  
Author(s):  
Kathleen Van Benthem ◽  
Chris M. Herdman
Keyword(s):  
Cognitive Functioning ◽  
Flight Path ◽  
General Aviation ◽  
Cognitive Factors ◽  
Pilot Performance ◽  
Pilot Error ◽  
Age Related ◽  
And Performance ◽  
Relationship Of ◽  
The Relationship

Abstract. Identifying pilot attributes associated with risk is important, especially in general aviation where pilot error is implicated in most accidents. This research examined the relationship of pilot age, expertise, and cognitive functioning to deviations from an ideal circuit trajectory. In all, 54 pilots, of varying age, flew a Cessna 172 simulator. Cognitive measures were obtained using the CogScreen-AE ( Kay, 1995 ). Older age and lower levels of expertise and cognitive functioning were associated with significantly greater flight path deviations. The relationship between age and performance was fully mediated by a cluster of cognitive factors: speed and working memory, visual attention, and cognitive flexibility. These findings add to the literature showing that age-related changes in cognition may impact pilot performance.

SIMULATION OF THE FLIGHT OF A DROP OF GALVANIC ELECTROLYTE IN AN INHOMOGENEOUS FIELD OF AN ELECTRIC CATCHER

2020 ◽  
Author(s):  
V.I. Garshin ◽  
◽  
A.R. Lebedev ◽  
S.E. Geraskova ◽  
◽  
...  
Keyword(s):  
Electric Field ◽  
Flight Path ◽  
Inhomogeneous Field ◽  
Inhomogeneous Electric Field ◽  
Trajectory Method

The article shows the relations for modeling an inhomogeneous electric field and the flight path of a drop of galvanic electrolyte in it. Estimates are preliminary. Articles and patents of authors in which non-uniform fields are already used are given. A modified trajectory method is proposed for evaluating the effectiveness of trapping harmful electrolyte droplets.

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