Hi all,
Sorry for the replicated post, I got problems in submitting.
I am confused about the RRA results. As I understood, I can repeat RRA procedure couples of times to reduce dmass, residual force and moment. I have tested with example gait2354, after the first RRA, I changed segments' mass as recommended in the adjusted.osim, and repeated the RRA, but got increased dmass and residual forces/moment etc.
Another question is about the sign of the dmass. For instance in the first RRA, I have negative residual FY, which seems to me that segment mass should decrease to make F=ma, but the dmass = F/g which is positive. Did I misunderstand something here?
Thank you in advance,
Ruoli
FIRST RRA
Computing average residuals between 0.75 and 1.25
Average residuals before adjusting torso COM:
FX=5.55288 FY=-4.91182 FZ=3.69025
MX=-4.17741 MY=-1.09917 MZ=6.84788
dmass = 0.500866
Computing average residuals between 0.75 and 1.25
Average residuals after adjusting torso COM:
FX=5.21906 FY=-4.3049 FZ=4.49158
MX=-7.57714 MY=-0.498669 MZ=13.2414
Average residuals:
FX=2.09105 FY=-1.53004 FZ=1.06237
MX=-8.97722 MY=0.401054 MZ=19.2688
SECOND RRA
Computing average residuals between 0.75 and 1.25
Average residuals before adjusting torso COM:
FX=5.34924 FY=-9.0623 FZ=4.81492
MX=-7.51627 MY=-0.521899 MZ=13.1854
dmass = 0.924098
Computing average residuals between 0.75 and 1.25
Average residuals after adjusting torso COM:
FX=4.74487 FY=-7.97434 FZ=6.35765
MX=-13.4851 MY=0.747777 MZ=25.4286
Average residuals:
FX=4.91914 FY=-4.22313 FZ=2.50549
MX=-18.3712 MY=2.39016 MZ=36.3895