2024年9月26日 · We’re digital humanities people who incorporate physical making/art into our work (or do it as a hobby and share it online somewhere)! Who is this for? #DHmakes is loosely folks in digital humanities/libraries/academia/learning-work who craft/make (including as non-job hobby), open to anyone interested. What kinds of things get posted?

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2023年6月1日 · 当用 DH 方法建立起各杆件坐标系后, 系 i− 1 和系 i 间的相对位置和指向可用以下4 个参数表示: (1) 杆件长度 ai , 定义为从 Z i−1 轴到 Z i 轴的距离, 沿 X i 轴的指向为正. (2) 杆件扭角 αi, 定义为从 Z i−1 轴到 Z i 轴的转角, 绕 X i 轴正向转动为正, 且规定 αi ∈ (−π,π] . (3) 关节距离 di , 定义为从 X i−1 轴到 X i 轴的距离, 沿 Z i−1 轴的指向为正。 (4) 关节转角 θi，定义为从 X i−1 轴到 X i 轴的转角, 沿 Z i−1 轴的指向为正，且规定 θi ∈ (−π,π] .

1、描述两个坐标系的变换关系需要6个参数 (3个表示位置变换，3个表示姿态变换),为什么DH参数只需4个？ 2、利用DH参数建模时，各个连杆坐标系的建立是唯一的吗？ 3、DH参数表是唯一的吗？ 4、标准DH参数与修正DH参数有何异同？ 1、描述两个坐标系的变换关系需要6个参数 (3个表示位置变换，3个表示姿态变换),为什么DH参数只需4个？ 空间任意两个坐标系的变换关系确实需要6个参数来表示，然而，在建立各个连杆的坐标系时，我们可以拟定一些规则，使得坐标系满 …

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2017年7月20日 · Hank : dh vs non dh, should lacrosse take over soccer as the fourth sport?, (hank then claims in 30 years lacrosse will surpass baseball), what are the negative effects of athletes using social media?, are concussions real? Danny woodhead is presented with the grittiest performance of the year.

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