Performing RRA on cycling data
Posted: Wed Feb 10, 2016 5:52 pm
Dear all,
I'm currently trying to run some experimental cycling data through RRA in preparation for CMC simulations.
However, because I'm using a lower-limb model without a torso or arms, I get large residual forces in the vertical direction roughly equally the weight of the subject. These large residual forces are a result of the subject being in the seated position on the ergometer. When I perform RRA (or CMC), the algorithm tries to reduce these large residual forces by translating the model vertically. To correct for this, I was thinking I could either lock the pelvis translation in the vertical direction thereby preventing the algorithm from shifting the model vertically or apply an external force at the pelvis COM roughly equal to the weight of the subject to account for the seated position.
Has anyone else been in this situation when performing RRA? What would be the best practice?
Thanks in advance!
Adrian
I'm currently trying to run some experimental cycling data through RRA in preparation for CMC simulations.
However, because I'm using a lower-limb model without a torso or arms, I get large residual forces in the vertical direction roughly equally the weight of the subject. These large residual forces are a result of the subject being in the seated position on the ergometer. When I perform RRA (or CMC), the algorithm tries to reduce these large residual forces by translating the model vertically. To correct for this, I was thinking I could either lock the pelvis translation in the vertical direction thereby preventing the algorithm from shifting the model vertically or apply an external force at the pelvis COM roughly equal to the weight of the subject to account for the seated position.
Has anyone else been in this situation when performing RRA? What would be the best practice?
Thanks in advance!
Adrian