Physics Model Improve Data
The of all time, hitting ahome run in his final at bat, September 28, 1960.Welcometo my site devoted to research on the physics of baseball. My particular research interests are two-fold: the physics of the baseball-bat collision and the flight of the baseball. I have done quite a bit of independent research in both areas. I am also heavily involved with several areas of practical interest to the game. One is characterizing, measuring, and regulating the performance of non-wood bats, an area for which I have served on committees advising the NCAA and USA Baseball. Another is exploiting new technologies for tracking the baseball, such as PITCHf/x, HITf/x, and TrackMan, for novel uses in baseball analytics.
But this site does much more than catalog my own work. It attempts to provide links to much of the high-quality work done over the past decade or so on various aspects of the physics of baseball.
How can the answer be improved? Manually Uninstall Folder Lock 7.6.0 with Windows Add/Remove Programs. Click 'Start menu' and run 'Control Panel'. Locate Folder Lock 7.6.0 (or NewSoftwares.net) and click 'Change/Remove' to uninstall the program. Follow the uninstall wizard and uninstall the program. Some invalid files may be left in system registry and folders. To completely remove Folder Lock, you need to get rid of those remnants, otherwise, it will slow down your PC and block you installing other incompatible programs. To thoroughly delete its files, please follow the steps:. Completely remove folder lock.
If readers know of a site that I have overlooked, please contact me. Color contour plot relating exit velocity and launch angle to attack angle and centerline angle. The dashed red line indicates where the attack and centerline angles are equal.
The blue curves and colors are exit velocity contours and the black dashed lines are launch angle contours.In this presentation ( ), I present the results of various experiments on oblique ball-bat collisions and show how they are used to predict batted ball parameters from the swing parameters, as shown in the figure. Then I start to address the 'reverse engineering' problem, whereby one tries to determine the swing parameters, especially the attack angle, from the batted ball parameters. The issue of timing enters if the attack angle of the bat differs from the descent angle of the ball, and this issue is investigated quantiatively. Finally, the question is addressed whether it is advantageous to alter the swing to sacrifice exit velocity to gain some extra spin on the batted ball. Further links related to this topic can be found by clicking.
Airflow around a spinning baseball. The ball is moving from right to left and is spinning with backspin. Note that the wake behind the ball is deflected downward, resulting in an upward force on the ball.This is a link to the website of Prof. Barton Smith, aka.
Barton, a Professor of Mechanical and Aerospace Engineering at Utah State University, is an expert on sports ball aerodynamics and especially on the use of the technique known as Particle Image Velocimetry to study air flow patterns around the moving object. Nathan, The Hardball Times, August 27, 2018This article takes a critical look at how movement is determined from measurements of the trajectory. Two techniques are investigated. Technique 1 is that used currently by Statcast/Trackman. Technique 2 is based on one that I over 10 years ago. I show that Technique 1 results in systematic deviations of the movement from the exact values whereas Technique 2 does much better. The underlying physics behind Technique 2 is discussed; click for the spreadsheet template described there.
Chase Field, home of the Arizona Diamondbacks.As has been, a plan is afoot to install a humidor at Chase Field, home of the Arizona Diamondbacks. Prompted by these reports, I decided to dust off my old from 2011 that successfully postdicted the reduction in home runs when a similar humidor was installed at Coors Field. The new calculation combines physics with statistical analysis to predict a 25%-50% reduction in home runs that would result from storing baseballs in a humidor rather than in the very dry climate of Phoenix. This result has attracted some attention in the as well as a followup byAndrew Perpetua which tends to support the 50% (as opposed to the 25%) reduction.The DBacks management postponed use of the humidor to the 2018 season, so it is very useful to compare home run production in 2018 to that in 2017. Professor David Kagan'sdoes exactly that and is updated at the end of each home stand in the 2018 season. Other articles with the early returns from the 2018 season can be found, and.Finally, I gave a presentation on this topic at SABR48 in Pittsburgh, June 21, 2018.
The slides can be downloaded. Result of the carry analysisThis article reports the results of an analysis of trajectories at Tropicana Field for the 2015-2017 season to determine if there is any change to the carry of a fly ball. Since the Trop is a domed stadium, atmospheric effects are constant and any change in carry can be attributed to changes in the drag properties of the baseball.
A five foot increase in carry is found for 2016-2017 relative to pre-ASG in 2015, as shown in the figure. A more technical version of this article can be found. Home runs are up significantly in 2016.In this article, I take a deep dive into the increase in home runs in MLB during the first half of 2016. This increase can mostly be accounted for by an increase batted ball exit speed for balls hit in the angular range 20 0-35 0, the 'sweet spot' for home runs. Does that mean the baseball is 'juiced'?
Read the article and especially the Addendum to get my view. I gave a talk about this at the 2016 and the slides are available. Finally, I discussed this topic in some detail on a, August 25, 2016, with my interview starting at approximately 21:00.For another point of view, see the excellent article, by Ben Lindbergh and Rob Arthur. Early in the 2017 season, three new articles about this issue have appeared: by Ben Lindbergh, by Sam Miller, and by Russell Carleton.
Sunset over Coors Field in Denver, where the ball really flies.In this article, I use Statcast fly ball data from the 2015 season to investigate how fly ball distance depends on exit speed, vertical launch angle, and elevation. The Coors Field effect is quantified. Indirectly, this analysis is used to determine the effect on fly ball distance of temperature, relative humidity, and wind. A perhaps surprising result is the weak dependent of distance on the rate of backspin, in agreement with earlier findings reported in. The forces on a spinning baseball.This article describes how to use data to separate the spin of a pitched baseball into a part that leads to movement (the 'useful' spin) and a part that doesn't (the 'gyrospin'). It is shown that fastballs and changeups are consistent with all their spin being useful, whereas breaking pitches (including cutters) have varying but significant degrees of gyrospin.
Physics Model Improve Database
Physics-guided Neural Networks (pgnn)
The ratio of useful to total spin might be a helpful diagnostic for pitchers, especially those who throw breaking balls. Random measurement error in the movement means the type of analysis discussed in the article should only be used for averages of collections of pitches rather than for individual pitches. For those of you interested in technical details, you can read all about them in my unpublished.Jeff Long has written several articles for Baseball Prospectus,and especially, in which he has done some analysis using the concept of useful spin.