In the modern material engineering, the use of nanometer materials has entered the highly and intensively utilized stage, so new nanometer materials have been continuously found to replace the traditional ordinary mat...In the modern material engineering, the use of nanometer materials has entered the highly and intensively utilized stage, so new nanometer materials have been continuously found to replace the traditional ordinary materials. The so-called nanometer materials have the size within l - 100nm in thickness, which originates from the 1980s. At that time, nanometer materials didn＇t have a proper development due to the economic level. t towever, with the support of science and technology, this technology has undergone tremendous changes in the related fields. There have been increasing expansion in the kinds and the width in use of the nanometer materials, so have the research of nanometer materials. In this paper, we will briefly analyze the application ofnanometer materials in the sports engineering.展开更多
Shuttlecock used for badminton is light in mass so that its flight locus is strongly influenced by air. The highest launching velocity of the shuttlecock by professional badminton players exceeds speeds of over 83.3 m...Shuttlecock used for badminton is light in mass so that its flight locus is strongly influenced by air. The highest launching velocity of the shuttlecock by professional badminton players exceeds speeds of over 83.3 m/s （300 km/hr）. In this study, a new badminton server machine was developed. The badminton machine can launch the shuttlecocks at wide range of speeds up to 52.8 m/s （190 km/hr） and with many shot types such as smash, clear and so on, which are easily achieved. The finite element models of a shuttlecock with feathers and the badminton machine were made, and the launching simulations of the shuttlecock were tried. The roller with a large diameter attained a higher speed of the shuttlecock than the small rollers for all kinds of launching conditions. The taper angles of the roller edge and the insert height of the shuttlecock relative to the roller surface were optimized for attaining the maximum shuttle speed by the response surface approach. After the optimization, the performance of the badminton machine had been improved about 7% as the shuttle speeds increase and the stress causing the shuttle deterioration decreased.展开更多
文摘In the modern material engineering, the use of nanometer materials has entered the highly and intensively utilized stage, so new nanometer materials have been continuously found to replace the traditional ordinary materials. The so-called nanometer materials have the size within l - 100nm in thickness, which originates from the 1980s. At that time, nanometer materials didn＇t have a proper development due to the economic level. t towever, with the support of science and technology, this technology has undergone tremendous changes in the related fields. There have been increasing expansion in the kinds and the width in use of the nanometer materials, so have the research of nanometer materials. In this paper, we will briefly analyze the application ofnanometer materials in the sports engineering.
文摘Shuttlecock used for badminton is light in mass so that its flight locus is strongly influenced by air. The highest launching velocity of the shuttlecock by professional badminton players exceeds speeds of over 83.3 m/s （300 km/hr）. In this study, a new badminton server machine was developed. The badminton machine can launch the shuttlecocks at wide range of speeds up to 52.8 m/s （190 km/hr） and with many shot types such as smash, clear and so on, which are easily achieved. The finite element models of a shuttlecock with feathers and the badminton machine were made, and the launching simulations of the shuttlecock were tried. The roller with a large diameter attained a higher speed of the shuttlecock than the small rollers for all kinds of launching conditions. The taper angles of the roller edge and the insert height of the shuttlecock relative to the roller surface were optimized for attaining the maximum shuttle speed by the response surface approach. After the optimization, the performance of the badminton machine had been improved about 7% as the shuttle speeds increase and the stress causing the shuttle deterioration decreased.
