同雪网 SkiChinese.com 北美滑雪论坛

标题: 刻划半径计算器 [打印本页]

作者: quoiguaski 时间: 2012-2-24 10:30
标题: 刻划半径计算器
本帖最后由 quoiguaski 于 2012-3-2 09:42 编辑

此贴说法似乎有问题，小心注意
http://www.carving-ski.de/faq/ski-radius-rechner.php

算的不错，挺准的。

作者: bullpower 时间: 2012-2-24 10:37
if 0 degree edging, how can a c@rving ski turn??
It's totally against the design and physics of c@rving skis

作者: bullpower 时间: 2012-2-24 11:27
到底怎么回事，到底需要不需要EDGING？

http://www.arinsal-andorra.com/content/view/93/93/
The principle of the carving ski is fairly simple. The ski has curved edges so that it is narrower underfoot than at the tip and tail. This means that when it is tipped onto its edge it will bend under the weight of the skier. The further it is tipped, the more it will bend. As the ski moves forward, it will tend to follow the curve of the edge meeting the snow and turn in a smooth arc. This arc is controlled by the shape of the ski, the amount it is tipped over and the amount of pressure on it.

http://www.real-world-physics-problems.com/physics-of-skiing.html

The sidecut helps skiers make purely carved turns. It affects the physics of skiing in this regard by influencing the radius of purely carved turns, as will be discussed.A purely carved turn can be done with a ski that is flat on the snow or tilted at an angle to the snow. The figure below illustrates a ski that is tilted at an angle φ to the snow. When the ski is flat on the snow φ = 0.

(Note: In reality the ski edge is pressed into the snow, for a given angle φ. This is discussed in more detail in the physics of skiing section on how to prevent ski slippage).

When the ski is flat on the snow, a purely carved turn is executed when the radius of the turn RT equals the sidecut radius RSC. This allows the ski to go around the turn without any skidding, since the ski is always pointed in the same direction as its velocity v. The figure below illustrates a purely carved turn for a ski that is flat on the snow.

作者: iSki 时间: 2012-2-24 11:45
本帖最后由 iSki 于 2012-2-24 11:46 编辑

回复 1 # quoiguaski 的帖子

"Radius difference"这个指标有啥意义？是不是标志搓雪的能力？

作者: quoiguaski 时间: 2012-2-24 11:51

作者: quoiguaski 时间: 2012-2-24 11:57
标题: just for fun
[youtube]HO0hjU5Vmuo[/youtube]

作者: quoiguaski 时间: 2012-2-24 12:02
我们等等jluo达人，他一定会给我们一个完美的解释的。

作者: bullpower 时间: 2012-2-24 12:02
quoiguaski 吃力的，吃力的，另外一边只是没有离开雪面而已发表于 45 秒前

EDGING角度为０，
两个SIDE　CUT或者都不吃力，或者吃力相等，还是不明白为什么会TURN

作者: bullpower 时间: 2012-2-24 12:10
本帖最后由 bullpower 于 2012-2-24 12:10 编辑

quoiguaski 这厮大概把雪面做为刚性表面来考虑了。发表于 2 分钟前

你以为它算半径还把雪的变形考虑进去了？？？
都是理想状态下算的，雪面就是刚性表面
CARVING　SKI能TURN，全靠SIDE　CUT受力使雪板变形，如果没有EDGING，没变形，TURN个头啊。。。。
就是冲坡

作者: jluo 时间: 2012-2-24 12:13
jluo is sick, leave him alone, you guys can fight it out.

==> hint, skis are not flat

作者: bullpower 时间: 2012-2-24 12:18

jluo 发表于 2012-2-24 12:13
jluo is sick, leave him alone, you guys can fight it out.

==> hint, skis are not flat

还是不懂，
一只SKI，去掉BINDING，绑个大铁块上去（保证在中间位置），放坡上（假定光滑不变形），
雪板往下滑，会TURN吗？

作者: freshair 时间: 2012-2-24 12:24

By geometry, this means that for no slipping, δ must be greater than or equal to 90—φ.

作者: quoiguaski 时间: 2012-2-24 12:28
受不了了，空姐也是理科生啊，我这看见希腊字母就头大

作者: lupo 时间: 2012-2-24 12:35
看看机长的帖子吧。

作者: freshair 时间: 2012-2-24 12:48

quoiguaski 发表于 2012-2-24 12:28
受不了了，空姐也是理科生啊，我这看见希腊字母就头大

啥文科理科，太抬举了，就初中生＋文抄星！
挺简单的啊，不就是加力方向和板子陷到地里那一边夹角大于等于９０度就可以了吗？做不做得到再说。。。

作者: rockbass 时间: 2012-2-24 15:46
发这贴的楼主才是理科生，文科的都不会管什么半径的事。

作者: c_sea 时间: 2012-2-24 17:36
Jluo 说了： it is just skiing.

作者: quoiguaski 时间: 2012-2-28 10:04
如果说立刃越高，弧形越小，那可怜的苍蝇就会转的很小很快。。。

欢迎光临同雪网 SkiChinese.com 北美滑雪论坛 (http://www.skichinese.com/skichinese/)