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- Path: sparky!uunet!olivea!decwrl!concert!samba!usenet
- From: Herman.Woltring@bbs.oit.unc.edu (Herman Woltring)
- Newsgroups: comp.robotics
- Subject: Re: Denavit-Hartenberg question
- Summary: Attitude matrices and Euler/Cardan angles
- Keywords: Joints, angles
- Message-ID: <1992Sep2.182215.21272@samba.oit.unc.edu>
- Date: 2 Sep 92 18:22:15 GMT
- References: <chrisp.715431369@narbelek>
- Sender: usenet@samba.oit.unc.edu
- Organization: Extended Bulletin Board Service
- Lines: 29
- Nntp-Posting-Host: lambada.oit.unc.edu
-
- In article <chrisp.715431369@narbelek> chrisp@cs.uwa.oz.au (chris pudney)
- writes:
- >
- >G'day,
- >
- >Consider a mechanism with three orthogonal joint axes coincident at a single
- >point, that is, a spherical wrist with roll, pitch and yaw motion axes. How
- >can this mechanism be represented using D-H parameters. I can't come up
- >with a solution. Can you? If so would you please let me know it?
- >
- >Chris.
-
- In section 3.11 of Suh & Radcliffe, Kinematics and Mechanisms Design, Wiley
- 1978, the Hartenberg-Denavit notation is simply a 4*4 attitude/position
- transformation in homogeneous coordinates. In the upper-left 3*3 submatrix,
- a straightforward orthonormal attitude matrix is provided. In earlier sec-
- tions of this chapter, the standard Cardanic angles are related to this
- attitude matrix. Alternatively, one can use the `vector components' of an
- attitude vector which are truely orthogonal w.r.t. each other, but not
- generally physically realisable. See a manuscript in LaTeX retrievable via
- anonymous ftp as attjob.tex in subdirectory /pub/biomch-l at ftp.nici.kun.nl.
-
- Herman J. Woltring, Eindhoven/NL
- woltring@nici.kun.nl (do not send private notes to the BBS address)
- --
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