Bat Swing Analysis in Cricket

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Bat Swing Analysis in Cricket Bat Swing Analysis in Cricket Author Sarkar, Ajay Krishno Published 2014 Thesis Type Thesis (PhD Doctorate) School Griffith School of Engineering DOI https://doi.org/10.25904/1912/476 Copyright Statement The author owns the copyright in this thesis, unless stated otherwise. Downloaded from http://hdl.handle.net/10072/367481 Griffith Research Online https://research-repository.griffith.edu.au BAT SWING ANALYSIS IN CRICKET Ajay Krishno Sarkar 2013 Bat Swing Analysis in Cricket by Ajay Krishno Sarkar M. Eng (EEE), Mie University, Japan Griffith School of Engineering Science, Environment, Engineering and Technology Griffith University Submitted in fulfilment of the requirements of the degree of Doctor of Philosophy July 2013 ABSTRACT Technology in sports has had great impact during the last two decades. A lot of time, human power and cost are involved in existing batting research methods. The reliability and usefulness of these outcomes is prone to error and dependent on the human ability. In this project, miniature, inexpensive, user and match-friendly inertial sensors were used to extract the cricket bat swing features. The data was validated through existing tools. The object of this work was to demonstrate that accelerometers offer significant advantages in cricket batting analysis. Experimental and theoretical work involved ball free and ball-hit swing profiles. Bat swing was analysed using accelerometer sensors and was validated using a rigid pendulum. Good agreement was obtained between the measured angles by inclinometer and static sensor (r=0.99), and between the swing angles estimated from equation and dynamic sensor (r=0.88). Hits on the pivot arm showed the optimum contact location to maximize the energy transfer to the ball. A non-linear pendulum equation with moving pivot was solved numerically to model for swing angles in straight drive. The derived equation showed good agreement with the acceleration data (r=0.91). The effect of initial angular velocity, the radius of rotation and phase angle of the pivot on the acceleration profile were strongly correlated with the maximum acceleration peak (r≡0.99). Repetitive bat swings in a straight drive by a novice batter showed that the bat position and orientation can be identified. The results were validated by video. Sweet-spot impacts from bat-ball contacts in defensive strokes (n=61) by five novice batters were determined by the sensor data. An approximate equation for bat angle (cosine squared function of time) during the straight drive was validated with video (r=0.99). The derived acceleration profile matched to the sensor data. Using Bland Altman covariance correlation, correlation coefficients 0.95 and 0.98 were found individually for each batter and among the batters respectively. The results from this experiment allowed the applied force to be calculated. The effect of back-lift height in defensive stroke over the control of bat alignment in bat-ball contact was investigated. Sensor recorded three amateur batters i defensive strokes (n=30) data revealed a detrimental effect of higher back-lift height in bat alignment. The sensor data and video data for a planar orthodox straight drive was analysed using rigid body dynamics using a decision matrix. The maximum bat acceleration occurs when the radius of rotation is maximized. Video and sensor data showed good matching (r=0.92) and the translational and rotational acceleration components dominate on different parts of bat swing. The relationship between bat and wrist sensors data in defensive strokes (n=5) by five batters (one sub-elite, two amateurs, two novices) was investigated to determined the coupling between the hands and the bat before and after ball-contact. Sub-elite and amateurs data showed that the top hand was more strongly coupled with the bat than the bottom hand (slope>0.64 for top and slope>0.4 for bottom hand of individual regression lines). Other novices showed poor coupling and jarring of hands. A linear relationship (r>0.7) was found between wrists and bat velocities for all batters. Integrating the sensors with wireless connectivity can provide feedback to the coach about the quality of stroke play. ii STATEMENT OF ORIGINALITY This work has not previously been submitted for a degree or diploma in any university. To the best of my knowledge and belief, the thesis contains no material previously published or written by another person except where due reference is made in the thesis itself. Ajay Sarkar 5 July 2013 iii ACKNOWLEDGEMENTS I would like to extend my heartiest thank to my principle supervisor Professor David Thiel for his time, effort and friendship. Professor David has been more than a perfect supervisor during my studies and researches in Australia-he has been an advisor, mentor, and a good friend. His energy and enthusiasm still continue to amaze me. During the countless discussions I had with him, I always felt that I was his only student, although he had many Ph. D. students. His contribution has greatly enhanced this work in everything and he have taught me a greatly deal I will take with me to all my future endeavors. Thank you sir for being so generous with your time despite supervising many students, projects, teaching, duties as the Chair of the IEEE Wave Propagation Standards Committee and serving on the IEEE Antenna Standards Committee. I would also like extend my sincerest thanks to my associate supervisors Dr. Daniel James and Dr. Andrew Busch for their time, guidance and advice. Dr. Dan helped in some important issues that I should acknowledge separately. For instance, he made me aware about the wrong format in the manuscript I was submitting after preliminary acceptance of the paper, thank you Dan. Dr. Busch suggested I use EndNote program to prepare the references lists at the beginning of my journey for the Ph. D. research, thank you Andrew. There are several people I need to acknowledge for the help they provided for being the subjects of my research. Specially, all of my research mates in CWMA, Griffith University, and this thesis would not have been possible without their help. I would like to express my heartfelt thank to Griffith University to provide me the scholarship support (GUPRS, GUIPRS) which made the journey smooth during my research and studies. I would like to extend my thanks to the staff of Griffith School of Engineering, Griffith University for their very friendly cooperation in everything. iv Finally, of course I thank my family, particularly my wife Suvvra, whose contributions in many ways make me to come up to this stage at this time. Specially, some of her dedication for me I should acknowledge right now through this thesis to rest of my life. She took care of my little kids sometimes all the hours in a day while I even spent 9:00 am to 10:30 pm in university for research and studies. Just after returning home from UNI I used to go to sleep but could not help in any sort of family work. But always I used to find my food, daily necessities, things needed at my university are ready. She always tried to turn my gloomy moment into cheerful event by praying to God and inspiring me. I am thankful to God to bestow me such little kids of great patience. They never complained or press me to take them to hang around some where nice places (like parks, museum, rail-halls, zoo, hills etc.) even in the week end. They used to know from their mum that their Dad is very busy with research and studies. I am also grateful to my family members (my mum, uncle, brothers, sisters) back to my country for always inspiring me to work hard, keep patience, and resolve problems depending on God. v TABLE OF CONTENTS ABSTRACT………………………………………………………………………….I STATEMENT OF ORIGINALITY………………………………………………VI ACKNOWLEDGEMENTS………………………………………………………VII 1 INTRODUCTION 1 1.1 Cricket research 1 1.1.1 Cricket research endeavours 3 1.1.2 Cricket research directions 5 1.1.3 Research methods 6 1.2 Bat swing 133 1.2.1 Different phases of bat swing 15 1.2.2 Bat swing research 18 1.3 Thesis motivation and outline 22 1.3.1 The research gaps 22 1.3.2 Aims 23 1.3.3 Objectives 24 1.3.4 Contributions 25 1.3.5 Chapters 28 2 LITERATURE REVIEW 32 vi 2.1 Biomechanics and motor controls 32 2.2 Ecology & Assessment 55 2.3 Psychology 71 2.4 Morphology & physiology 76 2.5 Injuries and implements of batting 78 2.6 Literature using sensors methodology for other sports 81 2.7 An overview of the literature reporting sensors signal analysis 101 2.8 An overview of the literature reporting swing modelling and ball contact location in the bat in other sports 102 2.9 An overview of the literature reporting the cricket batting stroke that is known as the basis of all strokes 104 2.10 Literature Review Summary 105 3 CRICKET BATTING STROKES: PARAMETERS, ISSUES FOR BAT SWING RESEARCH 107 3.1 Batting strokes 107 3.1.1 The basic strokes and coaching points 109 3.2 Key parameters in the basic strokes 112 3.3 Existing data collection methods in cricket batting research 114 3.3.1 Data collection methods in cricket batting research 114 3.3.2 Overcoming the limitations in existing data collection methods 115 4 METHODOLOGY AND ANALYSIS 1188 vii 4.1 Research methodology 1188 4.1.1 Architecture of the inertial sensor platform 118 4.1.2 Signal processing of accelerometer data 140 4.1.3 Validation processes 155 4.2 Analysis method 161 5 RESULTS AND DISCUSSIONS 163 5.1 Pendulum swing results and insights for bat swing parameterizations 165 5.1.1 Background 165 5.1.2 Experimental Procedure 166 5.1.3 Results and discussion 167 5.1.4
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