Effect of hoop frequency and impact velocity on BBCOR of metal baseball bat by Yuu TAKASHIMA, Fumiya OMI, Yutaka KOBAYASHI, Kenichi TOKIEDA, Seishi FUJIHARA, Kazuyoshi ARAI

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Evaluation on hitting performance of baseball bats and their selection according to swing ability of a player by Hiroyuki KAGAWA, Masaya TAKAHASHI, Kazutaka SATO, Masato MIZOGUCHI, Takeshi YONEYAMA, Yujiro KITAGAWA, Hideaki NASU, Noriaki TAKEDA

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Study on restitution characteristics of new/old rubber baseballs and metal baseball bat adapting to the new rubber baseball by Shinobu SAKAI, Daisuke YASUTOMI, Jin-Xing SHI, Akira URAKAMI, Masato MIZOGUCHI

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Model deflection analysis of wooden baseball bat at impact as the bending of freely rotating beam pinned at one end and subjected to impact and inertia forces by Hiroyuki KATO, Jyungo KAWAKAMI

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Analysis of Swing Characteristics According to Division into Nine Courses Using Baseball Swing Measurement Device by Masahiro KAGEYAMA, Shigenori TANAKA, Yuhei YAMAMOTO, Takeshi NARUO

“…In recent years, as measurement devices have advanced due to sensor and information technology, we have been able to measure bat swing data just after baseball impact. Therefore, the purpose of this study was to examine the characteristics of a batter’s swing using batting skill assessments from baseball coaches with significant experience. …”
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Evaluation of restitution performance and examination of estimate equation of coefficient of restitution of table tennis racket by Hidechika KARASAWA, Hanae SHINOYAMA, Yukihiro ISHIBASHI, Tetsuya SAKAI, Kazuyoshi ARAI

“…However, the performance criteria for restitution characteristics still have been unclear due to lack of qualitative evaluation by each manufacturer. For metal baseball bats, a formula that can easily estimate the coefficient of restitution (COR) for the bat has been proposed. …”
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A research for analysing characteristics of university baseball players using swing measurement unit by Shigenori TANAKA, Takeshi NARUO, Yuhei YAMAMOTO, Rei SAITO

“…As a result, when the swing characteristics and batting performance were classified into two cluster by the k-means method, the players could be classified with high accuracy. …”
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Aerodynamic stability of a badminton shuttlecock by Kenichi NAKAGAWA, Hiroaki HASEGAWA, Masahide MURAKAMI, Shigeru OBAYASHI

“…Badminton is one of the most popular sports in the world and is famous as the sport having the fastest initial velocity of a batted ball among all ball games. Initial velocity immediately after smashing may reach up to 408 km/h (113 m/s) at maximum. …”
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