基于Working Model 2D运动仿真的机构设计     

顾艳红  蔡晓君  徐林林  窦艳涛 《实验技术与管理》2008,25(2):82-87

介绍了基于Working Model 2D运动仿真的机构设计.该文利用该软件对四杆机构进行运动仿真和运动分析,结合Excel实现凸轮机构的凸轮轮廓线的设计并作运动仿真.此软件简单易学,仿真过程形象直观,为机构设计提供了一个极好的工具.  相似文献   

自动多刀多功能划线机刀架运动系统结构设计     

王春暖 《包头职业技术学院学报》2014,(4):30-32

介绍了自动多刀多功能划线机刀架运动系统的设计原理。  相似文献   

Strategies for defending a dribbler: categorisation of three defensive patterns in 1-on-1 basketball     

Keisuke Fujii  Daichi Yamashita  Shinsuke Yoshioka  Tadao Isaka  Motoki Kouzaki 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):204-214

To clarify the defending-dribbler mechanism, the interaction between the dribbler and defender should be investigated. The purposes of this study were to identify variables that explain the outcome (i.e. ‘penetrating’ and ‘guarding’) and to understand how defenders stop dribblers by categorising defensive patterns. Ten basketball players participated as 24 dribbler–defender pairs, who played a real-time, 1-on-1 sub-phase of the basketball. The trials were categorised into penetrating trials, where a dribbler invaded the defended area behind the defender, and guarding trials, where the defender stopped the dribbler's advance. Our results demonstrated that defenders in guarding trials initiated their movements earlier and moved quicker than the defenders in penetrating trials. Moreover, linear discriminant analysis revealed that the differences in initiation time and medio-lateral peak velocity between the defenders and dribblers were critical parameters for explaining the difference between penetrating and guarding trials. Lastly, guarding trials were further categorised into three process patterns during 1-on-1 basketball (i.e. ‘early initiation’ trials, ‘quick movement’ trials, and ‘dribbler's stop’ trials). The results suggest that there are three defending strategies and that one strategy would be insufficient to explain the defending-dribbler mechanism, because both players' anticipation and reactive movement must be considered.  相似文献   

舞蹈镜头语言的组接运动研究     

孟梦 《洛阳师范学院学报》2012,31(10):120-124

舞蹈与镜头语言的结合创造了多维度的视觉审美,而当镜头组接技术运用于舞蹈影像创作中后,舞蹈本体的时空性再次被重新解构,镜头画面组接的方式在舞蹈视觉传达过程中起到至关重要的作用。因此,镜头组接中的切、叠化、淡出淡入、划变或任何其他由镜头到镜头的转换策略都将成为舞蹈传播的载体,并逐渐形成符合舞蹈特性的运动规律。文章将论题锁定在舞蹈镜头语言的组接运动上,重点结合多种形式的舞蹈影像个案逐步深入分析舞蹈与镜头组接运动之间复杂、多变的关系,并在微观分析基础上,探讨了舞蹈镜头语言运用的学术含义与认识价值。  相似文献   

基于随机微分方程的易逝性高科技产品更新时机研究     

鲁芳  王芹  张蓓 《科技管理研究》2023,(1):86-91

基于易逝性高科技产品的价值易逝性与高新技术特性，构建基于随机微分方程的易逝性高科技产品更新时机模型以解决易逝性高科技产品更新时机不确定性问题。首先，利用威布尔分布和多项式逼近函数构造无技术进步与价值易逝等外部因素干扰的易逝性高科技产品使用寿命模型；其次，采用布朗运动来模拟外部因素对易逝性高科技产品更新时机的影响情况，进而建立技术进步和价值易逝影响下易逝性高科技产品更新时机波动率模型；最后，选取i Pad作为易逝性高科技产品案例验证所构建的易逝性高科技产品更新时机模型，研究结果表明该模型具有较强的稳健性，可为高新技术生产企业在产品更新换代时提供一定的参考。  相似文献   

三维红外运动捕捉系统在田径技术诊断中的应用——以女子100m栏运动员王丽为例          下载免费PDF全文

何俊良  许以诚  李广凯 《体育科研》2016,(1):70-73

利用三维红外运动捕捉系统对运动员王丽的跨栏动作进行影像捕捉、分析,揭示其现有技术动作的特点。研究发现王丽跨栏技术的特点：（1）跨栏步幅大,主要体现在起跨步步幅大,这可能对其腾空时间有影响;着地距离较短,比较合理。（2）起跨腿支撑时间和摆动腿支撑时间较短,说明其下肢肌肉较为有力,能够快速支撑其身体质量。（3）腾空时间较长。  相似文献