
Charnwood Dynamics Motion Analysis
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PART III - ADVANCED TOPICS
1. Using Virtual Markers
Introduction
Definition
Assigning weights by model design (first category)
Centres of mass
Solving the localization of a known point into a rigid marker triad (second
category)
Validity
Having successfully defined some Virtual Markers…
2. Using Vector Angles
Defining two vectors
Vectors on Stick Figures
3D Vector Angles
2D Vector Angles
3D angle on a stick figure view
3. Segment Rotations - The Mathematics of Euler Angles
Background
Eulerian System
Choosing the Axis Sequence
Yaw, Pitch and Roll
Mathematical decomposition
Neutral alignments
Coda implementation
Notes and References
4. Segmental Analysis - Inverse Dynamics
Ankle Moments
Knee and Hip Moments
5. Enhancing Segment Representation
Single marker representation
Two-marker representation
Three-marker (triad) representation
Over-determination of segments using 4 or more markers
The case for pre-dynamic, or ‘static’ acquisition
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