| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 102 === This research is divided into two parts. The first part aims to establish a finite element (FEM) model characterizing the natural frequency and mode shape as well as the compressive failure of badminton racket frame made of carbon/epoxy composites. The second part aims to investigate the dynamic racket behavior in badminton swing.
In the first part, The FEM model was generated initially based on the geometric configuration and the associated material properties of badminton racket frame. The natural frequency and model was analyzed and then the compressive failure of the frame was described using the progressive failure approach. Both simulation and experimental results were compared and discussed. The natural frequency obtained from simulation corresponded well to the experimental data, and the maximum deviation is around 9 %. In addition, the discrepancy in terms of the compressive strength of the frame structure between the model prediction and experiments is about 4.8-14.1 %, nevertheless, failure locations obtained from the model prediction and experimental observation are quite close. Based on the comparison of model analysis and experimental results, the FEM model proposed in this study is capable of characterizing the natural frequency and model shape of the badminton racket frame as well as the compressive failure behaviors with accuracy.
In the second part, motion capture and strain gauge experiments are performed to clarify the movement and strain course of the badminton swing. Also, establishing an analytical method to characterize the badminton swing behavior, which is based on experimental racket-grip trajectory be seen as boundary conditions. The results revealed that the swing trajectory existing slight differences between the analytical and experimental results. Furthermore, under discussion about the shaft strain course, the trend of analytical strain course was close to the experimental data.
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