MODELING AND BALL SPEED VALIDATION OF A NEW SEPAKTAKRAW BALL LAUNCHER
DOI:
https://doi.org/10.24191/mjssr.v21i1.5666Keywords:
launcher modelling, ball launcher, sepaktakraw, validity, high-speed cameraAbstract
In recent years, the opponent's serve has become faster in sepaktakraw, resulting in the defensive work becoming a much harder task. Therefore, an effective training method to improve the defensive skills in sepaktakraw is imperative. Due to this reason, we have developed a new sepaktakraw ball launcher that can support sepaktakraw defence training. The aim of this study is to model and verify the ball’s speed launched from the device. The prototype ball launcher was developed based on a parametric model of the launcher mechanism and real-world sepaktakraw ball kinematics. The prototype ball launcher’s capability to launch sepaktakraw balls that reach real-world ball velocity was verified using a high-speed (480 Hz) camera motion analysis at four different launcher’s speed capacities (70%, 90%, 95% and 100%). The results showed that the launched ball speeds from the experiment were lower than the theoretical launched ball speed for all speed capacities, only reaching the maximum speed of 59.4 km/h at 100% speed capacity. It can also be observed that the differences between the experimental and the theoretical speeds were increased at higher motor speed capacities, indicating that lower motor efficiency could be one of the possible causes of the launcher producing low ball speeds during launch. Though the top speed of the launched ball was close enough to the real-world average ball speed during a serve (60 km/h), based on the launcher’s overall performance, further improvements are required before it is ready to be used for the training of elite athletes. Thus, several improvements to the ball launcher were suggested to increase the launched ball speed.
References
Brechbuhl, C., Millet, G., Schmitt, L. (2016). Accuracy and Reliability of a New Tennis Ball Machine: Journal of Sports Science and Medicine, 15: 263-267.
Choi, J., Lee, J. H., Jung, Y. G., & Park, H. (2020). Enhanced efficiency of the brushless direct current motor by introducing air flow for cooling. Heat and Mass Transfer, 56, 1825-1831.
Jamal, F. (2009). An analysis on tekong services between two Malaysian tekong in World Championship 2009: National Sports Institute, Kuala Lumpur, Malaysia.
Nadzrin Hamdan, Edin Suwarganda, Barry Wilson. (2012). Factors Correlated with Sepaktakraw Serve Speed: 30th Annual Conference of Biomechanics in Sports – Melbourne.
Gavali, Pankaj B, Sujit S. Patil and Sanjaykumar M. Ingale. (2022). Design and Fabrication of Thrower Mechanism for Multipurpose Ball Throwing Machine: Journal Asian Review of Mechanical Engineering. Vol.11 No.2, 2022, pp.1-10
Hakim, Abdul Aziz. (2010). Sepaktakraw. Surabaya: Unesa University Press. h. 8.
Hidayah, Isnaini, Nurul, Priyono Bambang. (2017). The Development of “Drilling” Machine For Sepaktakraw Practice: Journal of Physical Education, Sport, Health and Recreations 6 (3). 197 – 202.
International Sepaktakraw Federation (ISTAF). (2016). Rules of The Game Sepaktakraw.
Ismail, S. I., Mohd Zani, N. H., & Sulaiman, N. (2019). Relationship Between Launch Angle and Ball Distribution of Kuda Kick in Sepak Takraw Service. In Proceedings of the 3rd International Colloquium on Sports Science, Exercise, Engineering and Technology: ICoSSEET 2016, 20-22 November 2016, Kota Kinabalu, Malaysia 3 (pp. 69-73). Springer Singapore.
Ponnusamy Barath, Wong Fei Yong And Zulkifli Ahmad. (2015). A Low Cost Automated Table Tennis Launcher. Arpn Journal Of Engineering And Applied Sciences, Vol. 10, No. 1.
Syafiq Mohamad. (2008). Development And Prototyping Of A Takraw Ball Feeder For Accuracy Training Based System. Thesis Faculty Of Mechanical Engineering, Univeristi Malaysia Pahang.
Tanakorn Tony Ontan. (2008). Automated Sepaktakraw Ball Throwing Mechanism for Training: Tesis, California State University h.21
Wójcicki, K., Puciłowski, K., & Kulesza, Z. S. (2011). Mathematical analysis for a new tennis ball launcher. Acta Mechanica et Automatica, 5(4), 110-119.
