薄摩擦发球的一些观点

sinian1969 · 2013-3-1 08:39:00

<span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; ">以前看了很多文章都说薄摩擦发球转，且越薄越转。我通过长期实践得出的结论是，薄摩擦发球摩擦太薄反而不转。网上很多网友对薄摩擦发球旋转强的观点是：摩擦越薄，力臂越长(接近半径)，则力矩越大，球旋转越强。</span><span style="color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "></span><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">先说说我是怎样练薄摩擦的，我练薄摩擦一段时间后采用了光板练习，即正常方式将球抛起，在下落过程中用光板迅速摩擦，经过一段时间的练习，在光板摩擦球时几乎对球的下落过程没有影响，此时摩擦已经非常薄，甚至接近于切线。但我如法炮制将薄摩擦运用于正常球拍时，发现这种超薄的摩擦根本不能将球发转，唯一的一点就是球短。</span></div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">由此，我开始寻找原因。我一开始的想法是：我的发力不够，挥拍速度不够快。但我把摩擦加厚以后发现球可以发得很转。后来在看到民间发球高手的视频中刘继强正胶发球62转后，我终于肯定了我的想法：摩擦过薄发球不转。</span></div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; "></span></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">正胶和反胶胶面摩擦系数不一样，所以正胶发球的摩擦要比反胶厚，但我认为无论什么胶皮，摩擦过薄发球不转。</span></div>

sinian1969 · 2013-3-1 08:39:00

<div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">先说说一般发球不转的普遍原因。即不会摩擦，力透过球心，或者摩擦太厚(有触球瞬间的力分解可得，撞击力偏大，力臂短力矩小)，这样肯定发不转。</span></div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; "></span></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">那么，为何摩擦过薄发球不转呢？先引申一下物理知识：物体之间产生摩擦力必须要具备以下三个条件：第一：物体间相互接触、挤压，发生形变，有弹力；　第二：物体接触面粗糙；第三：物体间有相对运动趋势或相对运动。</span></div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; "></span></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">第二点和第三点不用说，肯定都具备了。我们就从第一点入手。相互接触、挤压、发生形变。其中相互接触可排除。剩下的就是挤压和形变。</span></div>

sinian1969 · 2013-3-1 08:39:00

<div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">为何正胶和涩套发球是摩擦都要比粘套厚才能发转，关键就在于挤压和形变。同种材质下，挤压大时无疑摩擦力增强，而形变的作用就是增大接触面积，即通常所说的涩套发球要把球裹住。</span></div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; "></span></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">所以，过薄的摩擦虽然增大了力矩，但同样使挤压和形变过小，难以使球加转。大家可以仔细观察一下，你拉出的那个旋转最强的加转弧圈球，能明显感觉到吃球，而且拉完后观察球拍可发现拍面上摩擦的接触面积是比一般摩擦要大的。</span></div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; "></span></span> </div><div style="word-wrap: break-word; word-break: break-all; color: rgb(68, 68, 68); font-family: Verdana, 'Lucida Grande', Arial, Helvetica, sans-serif; font-size: 14px; line-height: 25px; "><span style="word-wrap: break-word; word-break: break-all; font-size: 14px; line-height: 24px; font-family: 宋体; color: rgb(0, 0, 0); ">综上所述，发球要掌握好摩擦的薄厚程度的同时也要保证力矩最大化。不同的胶皮，发球所掌握的摩擦薄厚程度是不一样的，即摩擦厚度，正胶大于涩性反胶，涩性反胶大于粘性反胶(涩套表面摩擦系数小于粘贴，发球是依靠挤压和形变增大摩擦)。</span></div>

sinian1969 · 2013-3-4 08:29:00

貌似说的有些道理

高龄新手 · 2013-3-7 20:44:00

学习了。。。。。。

爱乒乓爱 · 2013-3-9 21:03:00