Difference between revisions of "Rigid Body Motion"

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==Summary==
 
==Summary==
  
The following are the key concepts covered in this chapter:
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<amsmath>x \in {\mathbb R}</amsmath>
 
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# Rotational motion of a rigid body is represented by an element of the special orthogonal group
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:<math> SO(3) = \{ R \in {\mathbb R}^{3 \times 3} \mid R^T R = I, \det R = 1 \} </math>
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which is often parameterized  by the exponential map
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:<amsmath> \exp: so(3) \longrightarrow SO(3): \skew{\omega}\theta \mapsto e^{\skew{\omega} \theta}. </amsmath>
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Other parameterizations of SO(3) include fixed and Euler angle sets, and unit quaternions.
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# The ''configuration'' of a rigid body is represented as an element <amsmath>\textstyle g \in \SE(3)</amsmath>.  An element <amsmath>\textstyle g \in \SE(3)</amsmath> may also be viewed as a mapping <amsmath>\textstyle g:{\mathbb R}^3 \to {\mathbb R}^3</amsmath> which preserves distances and angles between points.  In homogeneous coordinates, we write \begin{displaymath} g = \bmatrix R & p \ 0 & 1 \endbmatrix \qquad \aligned R &\in SO(3) \ p &\in {\mathbb R}^3. \endaligned \end{displaymath} The same representation can also be used for a rigid body transformation between two coordinate frames.
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Revision as of 16:34, 2 July 2009

Summary

<amsmath>x \in {\mathbb R}</amsmath>