visual3d:documentation:modeling:segments:transforming_segment_moment_of_inertia
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visual3d:documentation:modeling:segments:transforming_segment_moment_of_inertia [2024/06/19 13:58] – created sgranger | visual3d:documentation:modeling:segments:transforming_segment_moment_of_inertia [2024/07/17 15:45] (current) – created sgranger | ||
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+ | ====== Transforming Segment Moment of Inertia ====== | ||
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Let the Inertia Tensor of Segment (foot or shank) in it’s own local coordinate system (f) be given: | Let the Inertia Tensor of Segment (foot or shank) in it’s own local coordinate system (f) be given: | ||
- | {{SegmentInertia_1.gif}}\\ | + | {{:SegmentInertia_1.gif}}\\ |
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Find the value of this inertia tensor in any other reference frame (for example, ground) using the following equation: | Find the value of this inertia tensor in any other reference frame (for example, ground) using the following equation: | ||
- | {{SegmentInertia_2.gif}}\\ | + | {{:SegmentInertia_2.gif}}\\ |
- | Where {{SegmentInertia_3.gif}} is the rotation matrix that transforms a vector from it's own coordinate system (lcs) to the ground coordinate system | + | Where {{:SegmentInertia_3.gif}} is the rotation matrix that transforms a vector from it's own coordinate system (lcs) to the ground coordinate system |
- | and {{SegmentInertia_4.gif}} is its transpose. | + | and {{:SegmentInertia_4.gif}} is its transpose. |
- | The above expression does not include the terms due to the parallel axis theorem ({{SegmentInertia_5.gif}}) which are: | + | The above expression does not include the terms due to the parallel axis theorem ({{:SegmentInertia_5.gif}}) which are: |
- | {{SegmentInertia_6.gif}}\\ | + | {{:SegmentInertia_6.gif}}\\ |
where the vector s defines the location of hte segment' | where the vector s defines the location of hte segment' | ||
- | The total Inerties {{SegmentInertia_7.gif}} for the segment is: | + | The total Inerties {{:SegmentInertia_7.gif}} for the segment is: |
- | {{SegmentInertia_8.gif}}\\ | + | {{:SegmentInertia_8.gif}}\\ |
To find the total moment of inertia of all segments relative to ground you add the individual segment inertias: | To find the total moment of inertia of all segments relative to ground you add the individual segment inertias: | ||
- | {{SegmentInertia_9.gif}}\\ | + | {{:SegmentInertia_9.gif}}\\ |
visual3d/documentation/modeling/segments/transforming_segment_moment_of_inertia.1718805508.txt.gz · Last modified: 2024/06/19 13:58 by sgranger