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排球
相关语句
  volleyball
    The Separation Characteristics of the Flow Past a Volleyball at Critical Reynolds Number
    临界Re数排球绕流分离的特性
短句来源
    Identification Modeling for Random Aerodynamic Forces on Volleyball with Various Types of Seams
    排球球缝随机气动力辨识建模
短句来源
  volleyball
    The Separation Characteristics of the Flow Past a Volleyball at Critical Reynolds Number
    临界Re数排球绕流分离的特性
短句来源
    Identification Modeling for Random Aerodynamic Forces on Volleyball with Various Types of Seams
    排球球缝随机气动力辨识建模
短句来源
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  volleyball
The aim of this study was to determine the effect of both acute exercise and maintained training during a period of competition (3 mo, at the start of the season) on iron metabolism in sportsmen on a professional volleyball team.
      
This particular disease is often found in athletes engaged in overhead motion in abduction/external rotation of the arm, such as in ball sports like volleyball or European handball, racket sports like tennis or badminton, or swimming.
      
Shoulder problems are common in overhead sports like baseball, basketball and volleyball.
      
Three of the patients were females (endurance runner, high jumper, and orienteerer) and two males (volleyball and soccer player).
      
Strategies to serve or receive the service in volleyball
      
更多          
  volleyball
The aim of this study was to determine the effect of both acute exercise and maintained training during a period of competition (3 mo, at the start of the season) on iron metabolism in sportsmen on a professional volleyball team.
      
This particular disease is often found in athletes engaged in overhead motion in abduction/external rotation of the arm, such as in ball sports like volleyball or European handball, racket sports like tennis or badminton, or swimming.
      
Shoulder problems are common in overhead sports like baseball, basketball and volleyball.
      
Three of the patients were females (endurance runner, high jumper, and orienteerer) and two males (volleyball and soccer player).
      
Strategies to serve or receive the service in volleyball
      
更多          


This report attempts to answer the question that why a flying volleyball may swing, serve or curve. It has been pointed by many researchers that the swing, swere and curve motion of a sports ball is predicated by a Magnus Effect or that it has been attributed to asymmetric boundary layer separation caused by a spinning ball or by a ball seam which is placed asymmetrically about the velocity direction of the ball. The problem is whether, if the ball were not spinning and the ball seam were symmetric about the...

This report attempts to answer the question that why a flying volleyball may swing, serve or curve. It has been pointed by many researchers that the swing, swere and curve motion of a sports ball is predicated by a Magnus Effect or that it has been attributed to asymmetric boundary layer separation caused by a spinning ball or by a ball seam which is placed asymmetrically about the velocity direction of the ball. The problem is whether, if the ball were not spinning and the ball seam were symmetric about the velocity direction of the ball, there would be some aerodynamic loads under which the ball may swing, swerve or curve. In this experiment a non-spinning volleyball whose seam was placed symmetrically about the wind direction was tested in a wind tunnel. The aerodynamic loads were measured by use of a strain gauge balance. The separation on the volleyball was measured with hot-film. The experimental results suggest that at the region of critical Reynolds number the separation on a nonspinning volleyball is unstable. There is not only alternation between laminar and turbulent separation but also change of the turbulent separation region on the surface of the volleyball. It causes the fluctuations of drag and lateral force, which is the same order of magnitude as the mean drag, and is essential reason causing swing, swerve or curve motion of a volleyball.

在风洞中对真实排球进行了临界Re数分离特性的实验,应用热膜技术测定了排球表面平均剪切应力(?)_w和平均分离位置,应用天平测量了排球上的空气动力。结果表明,在临界Re数范围,无旋转飞行的排球上的分离是不稳定的,从而可以产生与平均阻力同量阶的阻力变动与法向力变动,这是不旋转排球在临界Re数范围可以发生飘球现象的根本原因。

 
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