Static optimization

[rajat das]

Hi,

1. I am attaching "StaticOptimization_force.xls" file. I have deleted few columns because of size. Kindly look into the FX,FY,FZ, MX,MY,MZ and see that it is in acceptable range or not. Otherwise what I should do ?

2. From these "StaticOptimization_force.xls" after the muscle column file we get similar columns which generates from Inverse Kinematics also (hip_flexion_r, hip_adduction_r, hip_rotation_r). What is the difference between these two values ?

[Dimitar Stanev]

1) Fy is very high, indicating that you are not accounting for ground reaction forces. I imagine this is a gait.

2) These columns correspond to the moments for these joints. It is a force analysis so the data is either a force or a moment.

[rajat das]

These columns correspond to the moments for these joints. It is a force analysis so the data is either a force or a moment.

Can we expect that Inverse Kinematics results and these moments/force values generated from Static Optimization is comparable or same ?

[rajat das]

I imagine this is a gait.

This is a Single Limb standing (SLS) exercise, where the participants first stand on double leg and then after some time doing (SLS) and again then double limb stand.

[Dimitar Stanev]

Can we expect that Inverse Kinematics results and these moments/force values generated from Static Optimization is comparable or same ?

No they are different.

Kinematics gives you the values of the coordinates (e.g. joint angles) that define the pose of the model.
Force gives you the torques or forces (generalized forces) that are required to achieve this particular movement.

[rajat das]

Thank u. But I actually I mean to say that Inverse Dynamic result and static optimization force values are same?