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http://dx.doi.org/10.5369/JSST.2018.27.6.380

Implementation of a PLC-based Pitching System capable of Pitching a Breaking Ball  

Kim, Min-Kyu (Department of Automation System, Korea Polytechnics)
Publication Information
Journal of Sensor Science and Technology / v.27, no.6, 2018 , pp. 380-385 More about this Journal
Abstract
Recently, interest in baseball has been increasing as the level of international baseball games, the popularity of domestic leagues, and the number of players entering the MLB has increased. In this paper, we propose a pitching system that can be applied to both professional and amateur baseball. The pitching system consists of a control module using MSB764T PLC, a pitching mechanism including AC motors and a ball feed rail, an HMI using the CHA-070WR model, inverter, etc. To pitch the breaking balls, the two AC motors each use an inverter to independently control the speed. The implemented pitching system was experimented on, investigating ball speed and ball movement according to RPM using the BUSHNELL Velocity Speed Gun. Experimental results on ball speed are similar to the theoretical data and the measured data. From the experimental data, it is confirmed that the damping coefficient value for the pitching ball is about 0.98. In the case of the breaking ball, the larger the difference between the speeds on the sides of the ball and the faster the ball speed, the larger the bending degree.
Keywords
Pitching system; Programmable logic controller; Differential pressure transducer; Breaking ball;
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Times Cited By KSCI : 2  (Citation Analysis)
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