不同羽球拍勁度與平衡點 對於揮拍速度及球速表現之影響

The Effect of Different Stiffness and Balance Point on Badminton Racket’s Swing Velocity and Ball Velocity

林雅涵(Ya-Han Lin)

指導教授 ： 相子元

國立臺灣師範大學/運動與休閒學院/運動科學研究所/碩士(2010年)

摘要

目的：探討四種球拍勁度 (stiffness)及三種球拍揮重 (swing weight)對於揮拍速度、球速以及恢復係數的影響，以做為日後球拍選擇及設計上的依據。方法：實驗將分為固定式撞擊實驗以及實際揮擊實驗兩部分，皆使用高速攝影機10000 Hz擷取頻率拍攝其撞擊與擊球畫面，利用動作分析軟體分析其擊球前後的揮拍速度及球速。以二因子相依樣本變異數考驗two-way ANOVA考驗球拍勁度與揮重對於揮拍速度、球速以及恢復係數的影響，顯著水準均訂為α＜.05。結果：固定式撞擊實驗部分：恢復係數會隨著撞擊速度的增加而上升，而中揮重球拍恢復係數顯著高於低揮重球拍。實際揮擊實驗：揮拍速度隨著揮重的增加而下降，而低揮重球拍球速顯著較中揮重球拍快；球拍勁度對於球速的影響力出現在90km以上的揮拍速度；高揮重球拍揮拍速度慢，但恢復係數相對於低揮重及中揮重球拍高。結論：球拍的揮重顯著影響揮拍速度、球速以及恢復係數，而球拍勁度的影響程度相對較小；建議未來在球拍選購及設計上可朝降低球拍揮重以提升揮拍速度，或者增加揮重以提升恢復係數。

關鍵字

恢復係數 ； 揮重 ； 勁度 ； 自然頻率

並列摘要

Purpose ：To understand the effect of four different kinds of stiffness and three different swing-weight on swing-velocity, ball-velocity and coefficient of restitution. The result of the study will be taken as index to the selection and design of badminton racket in the future. Methods: Two experiments were conducted in the study; In the first experiment, the ball was served and then collided the racket; in the second experiment, the ball is fastened with clamping, hanging in the air, and hit by players. The results were recorded by 10000 Hz high speed video camera, and analyzed by video analysis software, which helped researcher to compare swing velocity and ball velocity between pre-test and post-test. Statistical analysis were conducted by two-way ANOVA to examine the effects of stiffness and swing-weight on swing-velocity, ball-velocity and coefficient of restitution. The significant level was set at α<.05. Results: In the group impacted by server, the coefficient of restitution was in direct proportion to impact velocity, and the coefficient of restitution of middle swing weight was significantly higher than that of low swing weight. In the group hit by player, the swing velocity was in reverse proportion to swing weight, and the swing velocity of low swing weight was significantly faster than that of middle swing weight. Ball velocity was effected by the stiffness of the racket when swing velocity exceed 90 km; the Swing Velocity of high swing weight is slow, but its COR was higher than those of low swing weight and middle swing weight. Conclusion: The swing weight that significantly impacted on swing velocity, ball velocity and COR, and the influence of stiffness is comparatively less than swing weight. The users and designers would be advised to choose the racket with low swing weight in order to increase swing velocity, or high swing weight in order to increase COR.

並列關鍵字

COR ； Swing Weight ； Stiffness ； Natural Frequency

參考文獻

江勁彥 （2001）。 從網球拍設計原理談如何選購合適的網球拍。 彰化師大體育學報，2，123-128。

林信良、 陳五洲 （1999）。 不同穿線磅數的羽球網線其彈性恢復係數之探討。 大專體育，44，103-107。

蘇榮立、相子元 （1995）。 不同勁度網球拍對恢復係數的影響。 體育學報，20，261-268。

蘇榮立、 洪得明、紀世清 （1995）。 羽球殺球動作之定性分析。 國立體育學院論叢， 5 (2)，173-183。

Baker, J., & Wilson, B. (1978). The effect of tennis racket stiffness and string tension on ball velocity after impact. Research Quarterly for Exercise and Sport , 49 (3), 255-259.