| Summary: | 碩士 === 樹德科技大學 === 資訊工程系碩士班 === 101 === Objective: This research investigates racket vibration of striking the forehand overhead clear by using inertial sensors, the racket vibratory acceleration and vibration when the female badminton players are striking the forehand overhand clear.
Subject: The study divided 10 skillful female badminton players into two groups. The present study categorizes these players as elite and good players. Group A, categorized as elite, contains five right-handed female players (height 160.8 ± 3.1 cm, weight 55 ± 3.6 kg, within the age of 17.8 ± 1.8 years, and playing experience 9.4 ± 0.9 years). Similarly, Group B, categorized as good, consists of five female players, who are also right-handed (height 162.4 ± 3.4 cm, weight 52.4 ± 1.8 kg, age of 14.4±0.5 year old and playing experience 5.6±years).
Methods: The experiment attaches wireless inertial sensors on the badminton racket (i.e. triaxial accelerometers, with a sampling frequency of 3333Hz). The experiment also uses a high-speed camera and speed gun. These instruments enable the researcher to collect the data of the hitting time, batting point on the racket and racket vibration, and furthermore to do the statistical analysis.
Results: The study offers six interesting results. First, a player with or without inertial sensors on racket shows no significant difference on a t-test analysis. Second, the ball speed from Group A is significantly faster than female players from Group B. Third, the comparative analysis between the batting points and the number of vibration shows that three players from Group A (i.e. player a and c) and Group B (i.e. player h) perform higher steadiness. Fourth, the analysis of the average value and the total power in the racket Z axis (i.e. direction of the ball hitting) acceleration in the frequency domain indicates that Group A has a significant higher value than the Group B. Fifth, in the Z-axis acceleration domain, all the players are significantly different from each other in the items of maximum value, minimum value and total power. Six, the result on racket vibration time and XYZ axis indicate a significant difference between the two groups of badminton player (i.e. Group A and Group B). The result also suggests that racket vibration of players from Group A has shorter time than the players from Group B.
Conclusion: First, with or without wireless inertial sensors does not affect players’ performance when striking the forehand overhead clear. Second, The result suggest that elite players from Group A has faster ball speed than the good players from Group B. Third, two elite players from Group A (i.e. player a and c) and one player from Group B (i.e. player h) show high accuracy on the batting point. Fourth, the force situation of players from Group A are larger than players from Group B. Finally, the time of vibration analysis shows that players from Group A, elite group immediately relaxed after hitting, while players from Group B were not.
Implication: The study establishes a reference norm from the Group A players. This norm provides a better reference for badminton coaches when offering training for badminton players.
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