[robocup-humanoid] Seven "Size 1" Soccer Balls
赵明国
mgzhao at mail.tsinghua.edu.cn
Mon Jun 8 05:10:28 EDT 2015
Hi all,
I have asked the site-team to buy size 1 and size 5 balls under my suggestion two weeks ago. Maybe I could get some sample or picture and data of the balls within a few days. Pls wait for some time.
Best,
Mingguo
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赵明国 博士
北京清华大学自动化系
控制理论与技术研究所 100084
邮件: mgzhao at mail.tsinghua.edu.cn
电话: 010 627 94322
传真: 010 627 86911
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Dr. Mingguo Zhao
Dept. of Automation, Tsinghua University
Beijing, China, 100084
Mail: mgzhao at mail.tsinghua.edu.cn
Tel: (86) 10 627 94322
Fax: (86) 10 627 86911
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> 在 2015年6月8日,下午1:59,Jacky Baltes <jacky at cs.umanitoba.ca> 写道:
>
> Hi,
>
> Since this translates to a difference in diameter from 10 to 15 cm, I think
> that matches the definition of approx 13cm. So I do not see an urgent need
> to change the rules.
>
> Teams need to be prepared to play with different types of balls.
>
> It would be best if the LOC would send some pictures of the balls that they
> decided upon, so that we can post them to the mailing list.
>
>
>
> On Fri, Jun 5, 2015 at 1:15 PM Sean Luke <sean at cs.gmu.edu> wrote:
>
>> On Jun 2, 2015, at 4:38 PM, Luis F Lupián <lupianl at ieee.org> wrote:
>>
>>> The second and fourth balls from the left seem to be size 0 rather than
>> size 1. When I was shopping around for size 1 balls I realized that some
>> vendors incorrectly offer size 0 balls as if they were size 1.
>>
>> Hmmm, one of those "size 0" balls is not a fly-by-night ball: it is a
>> Wilson. I don't think they'd label it size 1 incorrectly. My googling
>> also doesn't reveal a size 0 :-(.
>>
>> I have measured the balls in question. The smallest balls (what you
>> thought might be "size 0") have a circumference3 of 41.5cm. The medium
>> balls are around 46cm. The largest ball is 48.5cm.
>>
>> Given all this, I suspect that in fact there is no FIFA definition of a
>> "size 1" at all, only a large, vague size range for promotional gifts. The
>> majority of my size-1 balls hover around 46-48. This jibes with online
>> range suggestions I've seen: but not with the humanoid league specs.
>>
>> So I think that the specs are probably wrong. What I want to know is,
>> which of these two parts of the humanoid league spec take precedence at the
>> competition when it comes to disputing the ball sizes used?
>>
>> - "Size 1" -- meaning we could well see at least a 46cm ball
>> - "about 13cm in diameter" -- 40.84cm
>>
>> To help the small size robots, it'd be helpful to know what size ball we
>> should actually be using and what sizes are definitely wrong.
>>
>> Sean
>>
>>
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>>
>>
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