Denavit-Hartenberg parameters
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When the coordinate frames are assigned to a manipulator, the transformation between each two consecutive frames and have to be described. Therefor the 4 Denavit-Hartenberg parameters illustrated in the figure on the right are used, which are defined as follows:
- The angle is defined as the angle about the -axis to align with the new -axis.
- is the offset or translation, respectively, along the -axis from the origin of to the intersection with the common normal (shown as a dashed red line in the figure).
- The parameter corresponds to the length of the common normal which is equivalent to the translation along it.
- If the related joint is a revolute joint, can also be regarded as the radius of the rotation about the -axis
- The angle corresponds to the angle about the common normal to align the -axis with the new -axis