Comparing cueing and constraints interventions for increasing launch angle in baseball batting.

2018 ◽  
Vol 7 (3) ◽  
pp. 318-332 ◽  
Author(s):  
Rob Gray
Keyword(s):  
Launch Angle

Study of Barrel Bending Measurement and Correcting Model with PSD and Gun Barrel Robot

2013 ◽  
Vol 712-715 ◽  
pp. 2281-2284
Author(s):  
Xiang Fei Meng ◽  
Chang Ming Wang
Keyword(s):  
Position Sensitive Detector ◽  
Automated Measurement ◽  
Sensitive Detector ◽  
Gun Barrel ◽  
Position Sensitive ◽  
Launch Angle

To solve the problem that bending caused by the weight of gun barrel will affect firing accuracy, the paper put forward a method that uses position sensitive detector (PSD) , gun barrel robot and some other testing equipments to carry on a automated measurement on gun barrel, and establish a correcting model according to the measured results. By this way it can amend gun launch angle to improve firing accuracy and the hitting accuracy of first Shot.

scholarly journals Acoustic Signal Attenuation Determination Technique Traveling Through Obstacles

2019 ◽  
Vol 8 (3) ◽  
pp. 2012-2016
Keyword(s):  
Signal Processing ◽  
Acoustic Signal ◽  
Acoustic Signals ◽  
Signal Frequency ◽  
Signal Attenuation ◽  
Laboratory Procedure ◽  
Novel Technique ◽  
Sonar Signal Processing ◽  
Launch Angle

This paper presents a novel technique for calculation of attenuation of acoustic signals in the materials in underwater channel. A laboratory procedure and algorithms have been developed for finding attenuation. In many applications like sonar signal processing acoustic signal attenuation in the dome or in an enclosure are required to be known. Finding the actual attenuation while signal passes through the materials is very useful in calculating the precise power transmitted through the enclosures. The attenuation in materials mainly dependent on type of material, signal frequency and launch angle of the signal. A proper procedure has been presented in this paper

Initial Ball Flight Characteristics of Curve and Instep Kicks in Elite Women’s Football

2012 ◽  
Vol 28 (1) ◽  
pp. 70-77 ◽  
Author(s):  
Alison Alcock ◽  
Wendy Gilleard ◽  
Nick A.T. Brown ◽  
John Baker ◽  
Adam Hunter
Keyword(s):  
Regression Models ◽  
Three Dimensional ◽  
Spin Axis ◽  
Vertical Coordinate ◽  
Ball Flight ◽  
Launch Angle ◽  
Target Center ◽  
Women's Football

Initial ball flight characteristics of curve and instep kicks were investigated. Fifteen international female footballers performed curve and instep kicks from a distance of 20 m from goal and at a 1 m2 target. Seventeen Vicon cameras tracked three-dimensional coordinates of four reflective markers adhered to the ball. Ball flight characteristics were quantified, and the coordinates of the ball relative to the target center were recorded. The lateral launch angle and the angle of the spin axis relative to the horizontal best predicted the horizontal placement of the ball relative to the target. The vertical launch angle, antero-posterior velocity and amount of backspin best predicted the vertical coordinate. Regression models demonstrated how carefully controlled the flight characteristics must be with launch angles constrained within 3° to hit the target. Curve kicks were characterized by significantly greater lateral and vertical launch angles, increased sidespin and spin about the antero-posterior axis, and a more vertical spin axis. This information is beneficial for coaches in training players to achieve the characteristics required to score a goal and avoid a defensive wall. For example, if players consistently kick above or below the target, these findings identify the variables that will help rectify that error.

scholarly journals The effect of dimple error on the horizontal launch angle and side spin of the golf ball during putting

2016 ◽  
Vol 35 (3) ◽  
pp. 224-230 ◽  
Author(s):  
Ashley K. Richardson ◽  
Andrew C. S. Mitchell ◽  
Gerwyn Hughes
Keyword(s):  
Golf Ball ◽  
Launch Angle

scholarly journals Simulation Model of Fragmentation Risk

2021 ◽  
Author(s):  
Mirko Djelosevic ◽  
Goran Tepic
Keyword(s):  
Risk Assessment ◽  
Simulation Model ◽  
Total Mass ◽  
Epistemic Uncertainty ◽  
Process Industry ◽  
Cylindrical Tank ◽  
Average Value ◽  
Accident Data ◽  
Fragmentation Probability ◽  
Launch Angle

In this chapter, a simulation model for fragmentation risk assessment due to a cylindrical tank explosion is presented. The proposed fragmentation methodology is based on the application of Monte Carlo simulation and probabilistic mass method. The probabilities of generating fragments during the explosion of the tank were estimated regardless of the available accident data. Aleatoric and epistemic uncertainty due to tank fragmentation has been identified. Generating only one fragment is accompanied by aleatoric uncertainty. The maximum fragmentation probability corresponds to the generation of two fragments with a total mass between 1200 kg and 2400 kg and is 17%. The fragment shape was assessed on the basis of these data and fracture lines. Fragmentation mechanics has shown that kinematic parameters are accompanied by epistemic uncertainty. The range of the fragments in the explosion of the tank has a Weibull distribution with an average value of 638 m. It is not justified to assume the initial launch angle with a uniform distribution, since its direction is defined by the shape of the fragment. The presented methodology is generally applicable to fragmentation problems in the process industry.

scholarly journals Comparison of TrackMan Data between Professional and Amateur Golfers at Swinging to Uphill and Downhill Fairways

2021 ◽  
Vol 14 (1) ◽  
pp. 137-143
Author(s):  
Takeru Suzuki ◽  
John Patrick Sheahan ◽  
Taiki Miyazawa ◽  
Isao Okuda ◽  
Daisuke Ichikawa
Keyword(s):  
Ground Surface ◽  
Attack Angle ◽  
Outdoor Environment ◽  
Golf Club ◽  
Environmental Constraints ◽  
Ball Impact ◽  
Driving Range ◽  
Ball Trajectory ◽  
Flat Ground ◽  
Launch Angle

Background: Golfers face different environmental conditions in each game played under various constraints. Enhancing affordances through training in a constrained outdoor environment is crucial. Objective: To analyze club head behavior at ball impact of a tee shot by 42 professional (PGs) and 25 amateur (AGs) golfers in swinging to uphill and downhill fairway environments using the TrackMan portable launch monitor. Methods: We used TrackMan to compare golf club movement adaptations in 42 PGs and 25 AGs. A 330-m driving range facing both the uphill (+5°) and downhill (-5°) fairways were used. The tee shot area was the only flat ground surface, with the uneven ground between the shot area and the 200-yard fairway. Results: The clubhead speed and attack angle were significantly higher among PGs than among AGs. PGs could adapt their swings to the uphill fairway by increasing the attack angle (3.6°±2.4) by 3.3° compared with the downhill fairway. The attack angle did not correlate with the launch angle among the AGs in the downhill condition, suggesting that they were unable to control the height of the ball based on the far side of the fairway. Conclusion: PGs increased the attack angle in uphill conditions, and their awareness of the affordance, which was different from that of AGs, allowed them to change the optimal ball trajectory to avoid perceived fairway risks. Thus, the more skill a player had, the better he was at recognizing the affordance of the visual field. PGs demonstrated a better ability to adapt to environmental constraints.

The Effect of Projectile Weight on the Optimum Launch Angle and Range

2018 ◽  
Vol 56 (9) ◽  
pp. 584-585 ◽  
Author(s):  
David L. Herrick
Keyword(s):  
Launch Angle

Material and surface effects on the spin and launch angle generated from a wedge/ball interaction in golf

2005 ◽  
Vol 8 (1) ◽  
pp. 3-11 ◽  
Author(s):  
S. A. Monk ◽  
C. L. Davis ◽  
S. R. Otto ◽  
M. Strangwood
Keyword(s):  
Surface Effects ◽  
Launch Angle

scholarly journals Predicting golf ball launch characteristics using iron clubhead presentation variables and the influence of mishits

2021 ◽  
pp. 175433712098785
Author(s):  
Tom W Corke ◽  
Nils F Betzler ◽  
Eric S Wallace ◽  
Steve R Otto
Keyword(s):  
Linear Regression Analysis ◽  
Leading Edge ◽  
Specific Knowledge ◽  
Ball Speed ◽  
Impact Location ◽  
Ball Contact ◽  
The Impact ◽  
Launch Angle ◽  
Vertical Impact

In golf, it is well understood that the interaction between the clubhead and ball determines the initial ball launch conditions. Specific knowledge regarding these relationships for iron clubs, particularly when clubhead and turf interactions are considered, would be both novel and of benefit to practitioners. Linear regression analysis was used to determine relationships between selected clubhead presentation and shot outcome variables for a sample of 1127 ‘5-iron’ shots hit from natural turf by 96 golfers. As expected, clubhead speed was the most significant predictor of ball speed, with obliquity of impact and eccentricity of the impact location making smaller, yet statistically significant contributions. Marginally ‘fat’ strikes, whereby the leading edge of the clubhead was only slightly beneath the ground at impact, appeared to have a lesser effect than expected in terms of ball speed. Effective loft was found to be the strongest predictor of vertical launch angle, whilst clubhead speed and spin loft had the greatest influence in the model for predicting total spin; inclusion of ‘thin’ strikes (i.e. those struck with the leading edge) appeared to create a non-linear element to these models and consequently overestimated the influence of vertical impact location in both cases. These findings suggest that determination of impact location, particularly for instances whereby ball contact is not wholly on the club face, is critical in research concerning irons. Overall, this study makes an original contribution to the understanding of 5-iron shot outcomes based on clubhead presentation characteristics.

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