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首页> 外文期刊>Journal of exercise physiology online >The Tennis Strike Simulation Machine Identified and Confirmed Power Spot Location on Tennis Racket during Flat First Serve
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The Tennis Strike Simulation Machine Identified and Confirmed Power Spot Location on Tennis Racket during Flat First Serve

机译：网球打击模拟机确定并确认平坦先发球在网球拍上的力量点位置

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Pavilas C, Suwanthada S, Chaiwatcharaporn C. The Tennis Strike Simulation Machine Identified and Confirmed Power Spot Location on Tennis Racket during Flat First Serve. JEPonline 2015;18(3):14-26. The aim of this study was to determine the location of the power spot on tennis racket during flat first serve by studying the maximum ball outbound velocities and their behavior at five typical different impact locations on the string-bed of a tennis racket using a tennis strike simulating machine. Data were collected from striking tennis balls by a tennis racket that was clamped to a rotating swing arm driven at 450 rev·min-1 in the tennis strike simulating machine equipped with a high speed, high precision 3D motion capture and analysis system. This study focused on ball-racket interaction of flat serve from the instance of pre-inbound to post-outbound kinematics at five different impact locations and their respective smash ratios of an RR-model tennis racket. P1 was designated as impact location one tennis ball above Geometric String-bed Center, GSC of the racket, P2 was half a ball above GSC, P3 was at GSC, P4 was half a ball below GSC, and P5 was half a ball to the right of GSC. One way ANOVA was used to analyze the data. The results showed that resultant pre-impact ball velocities (ballpre) at these positions (P1-P5) differed statistically, except at P5 which was offset to the right of P3, with mean square error of 0.026 (LSD). Post-impact ball velocities (ballpost) at P1 to P5 were 43.482 ± 0.245, 44.436 ± 0.226, 43.701 ± 0.194, 43.668 ± 0.161, and 43.578 ± 0.178 m·s-1 respectively, which confirmed the power spot with highest outbound velocity was P2 (an impact location that is half a tennis ball above GSC). Pre-impact racket speed (racketpre) at P1 to P5 were ~30.823 ± 0.305 m·s-1 , thus resulting from the initial 15 setting of swing speed at 49.99 rad·s-1 . Therefore, the smash ratio (ballpost/racketpre) at P1 to P5 were 1.406 ± 0.015, 1.444 ± 0.012, 1.415 ± 0.008, 1.414 ± 0.018, and 1.412 ± 0.016, respectively, which reconfirmed that power spot P2 had the highest smash ratio. Maximum ball outbound velocity and smash ratio at power spot were higher than those of GSC by 1.681% and 2.049%, respectively. This implies that concept of power spot could be used to customize a tennis player’s first serve style.
机译：Pavilas C，Suwanthada S，Chaiwatcharaporn C.网球打击模拟机在首次发球平缓期间识别并确认了网球拍上的力量点位置。 JEPonline 2015; 18（3）：14-26。这项研究的目的是，通过研究使用网球拍在网球拍的弦网上的五个典型的不同撞击位置的最大出球速度及其行为，来确定平坦首次发球时网球拍上力量点的位置。模拟机。在装有高速，高精度3D运动捕捉和分析系统的网球打击模拟机中，通过网球拍从网球拍中收集数据，该网球拍被夹持在以450转·分-1驱动的旋转摆臂上。这项研究的重点是从RR模型网球拍在五个不同冲击位置的入站前到出站后的运动学实例，研究扁平球在球拍上的相互作用。 P1被指定为撞击位置，位于几何弦床中心上方一个网球，球拍的GSC，P2为GSC上方的半个球，P3为GSC的一半，P4为GSC的下半个球，P5为GSC的权利。使用ANOVA分析数据的一种方法。结果表明，在这些位置（P1-P5）处产生的撞击前球速度（ballpre）在统计上有所不同，除了在P5处偏移到P3的右侧，均方差为0.026（LSD）。 P1至P5的撞击后球速度（ballpost）分别为43.482±0.245、44.436±0.226、43.701±0.194、43.668±0.161和43.578±0.178 m·s-1，这证实了出站速度最高的功率点为P2（撞击点位于GSC上方网球半个球的位置）。 P1至P5的拍前球拍速度（racketpre）为〜30.823±0.305 m·s-1，这是由最初的15拍速度设定为49.99 rad·s-1所致。因此，P1至P5的粉碎率（ballpost / racketpre）分别为1.406±0.015、1.444±0.012、1.415±0.008、1.414±0.018和1.412±0.016，这再次证明了功率点P2的粉碎率最高。球的最大出球速度和击球率分别比GSC高1.681％和2.049％。这意味着可以使用功率点的概念来定制网球运动员的首次发球风格。

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