【摘要】 针对网球训练项目中的技术要求和存在的问题,提出了设计网球自动发射器的想法;介绍了网球自动发射器的基本结构;阐述了网球自动发射器实现发球频率、力量、角度的调整以及实现球的旋转等工作原理;并对该科研产品的性能特点进行了合理的分析。更多还原

【Abstract】 This article indicated an idea that design automatic emitter of tennis,to require of technique in tennis drilling and having problem;It introduced basal structure of automatic emitter of tennis;It expatiated principle that this machine achieves regulating frequency of serving and power and angle,and achieves revolving of tennis;Moreover,it logically analysed performance feature of the scientific research produce.更多还原