F0 and max stress and pcsa of muscle

Main Forum
1

Hi every body.
i want to find some data like F0 and max stress and pcsa of muscle of leg muscle.
Many thanks

2

Hi Aneoo,

Please have a look in the file.

Body\AAUHuman\LegTLEM\TLEM2.1\ModelMuscleParameters.any

Please also try to load the model and look at the data in the MuscleStrengthModel, it will have F0. In the TLEM data for the leg, the muscle volume can be found instead of PCSA.

Best regards
Søren

3

Hi toerholm,
I want to identify the cop point(r) and the reaction force from Ground .
can you help me.

4

Hi @aneoo

It depends a little on what model you have - does it include forceplates or are you using the GRF prediction tool?

If you have a model based on the Plug-in-gait_Simple with GRF prediction it is located:
Main.Studies.InverseDynamicStudy.Output.EnvironmentModel.ForcePlates.GRF_Prediction_Right.ForceMomentMeasure_Auto and likewise for the left foot.

For the same model with measured force plates it is:
Main.Studies.InverseDynamicStudy.Output.EnvironmentModel.ForcePlates.Plate2.ForcePlate.ForcePlateSeg.PlateSurface.COP_ball.Position - for each plate.

The reaction forces can be found in the same locations.

Best regards,
Bjørn
AnyBody Technology

5

Hi BJorn
Thank you for your explanation.
I am using 5td version and standing model(basic model).
I don't know How to extract that data.i have used this code

AnyOutputFile OutFile1={
FileName="Ankle Pos.txt";
Search={"Main.Studies.InverseDynamicStudy.Output.EnvironmentModel.ForcePlates.Plate2.ForcePlate.ForcePlateSeg.PlateSurface.COP_ball.Position"};
SepSign=";";
};
but it did not work.
Thank you

6

Hi @aneoo

What do you mean when you say the 5th version? is it AnyBody Modeling System version 5 or?
The Human Standing model template utilizes the GRF prediction, so you need to use the other example i gave you.

  • right COP: Main.Study.Output.Model.ModelEnvironmentConnection.GRF_Prediction_Right.GRF_point.Position
  • left COP: Main.Study.Output.Model.ModelEnvironmentConnection.GRF_Prediction_Left.GRF_point.Position

Best regards,
Bjørn
AnyBody Technology

7

Hi BJorn
Thank you
yes i mean AnyBody Modeling System version 5.
i cant find that Path .
in my version there is:
Main.Study.Output.Model.ModelEnvironmentConnection.Drivers.LeftFootReaction.LeftFootLinMeasure.Pos

and this one:

Main.Study.Output.Model.HumanModel.Left.Leg.Seg.Foot.GroundJoint.r
can i use this for Left ?

8

Hi @aneoo

Ah, that makes more sense. The tool I am referring to is not available in your version.
You need to make the ground reaction force prediction yourself since the current repository is not supported in AMS v.5.

I would advice you to consider upgrading to our newest version.
Not only will you get tools like the Ground Reaction Force prediction, but you will also get a more detailed human model and advanced features like force-dependent kinematics.

If you are interested in a short demo session please don't hesitate to send me a direct message.

Best regards,
Bjørn
AnyBody Technology

9

Hi everybody
I am using 5td version of anybody can I create Force plate in standing model.I don't have Force plate in my model.

10

Hi @aneoo

I think you best chance is to download the newest version of the ammr here and find the GRF prediction under tools.
I do not think you will get much relevant help for a 10 year old version here on the forum.

You must expect to make changes for the code to work in your model since the repository have undergone significant changes throughout the years, but hopefully you can make it work.

Best of luck
Bjørn
AnyBody Technology

11

Hi Bjorm
thank u
ok. i think your suggestion is so good.but it is too expensive to buy for me.
thank u.

12

Hi Bjorm
I have some problem about joint reaction .
I know that we can find reaction force in Fout for example in Hip joint there is Fout=[ a b c] which indicate that [a b c]=[ fx fy fz] and F is in distal segment Local coordinates .so if i have a static model by uper segment (trunk and hip) which direction F should be.equle or inverse compare to Fout.

13

Hi toerholm
I have some problem about joint reaction .
I know that we can find reaction force in Fout for example in Hip joint there is Fout=[ a b c] which indicate that [a b c]=[ fx fy fz] and F is in distal segment Local coordinates .so if i have a static model by uper segment (trunk and hip) which direction F should be.equle or inverse compare to Fout.

14

Hi @aneoo

Sorry for the late reply.

I am not quite sure I understand what you are trying to do.
Could you describe what you are trying to accomplish?
What force F are you referring to?

Best regards,
Bjørn
AnyBody Technology

15

Hi Bjorn
Thanks for your attention.
I want to simulate the reaction force in joint.and i want to find muscle force and joint reaction but because of redundancy i have to determine the right direction of joint reaction [fx fy fz] in global Coordination. i know that for example, in Hip joint Fout=[ a b c] which indicate that [a b c]=[ fx fy fz] and F is in distal segment Local coordinates.so if i have the model with upper segment in Hip joint(trunk and one link model )in which direction(in global ccordination) i can use Fout?

16

Hi @aneoo

You can find the directions of each joint reaction force under the selected output in the bodymodel.
Main.HumanModel.BodyModel.SelectedOutput.Right.Leg.JointReactionForce contains all reaction forces for the leg. similar folder exist for the trunk and arms. Here the JRF is mapped to the Proximal/Distal, Anterior/Posterior and Medio/lateral directions.

Best regards,
Bjørn

17

Hi Bjorn
Thank you for your answer.
yes we can find that but by which direction it load at the hip joint to trunk(in line with that or Opposite to that direction) and along which direction it load at the Hip Joint to the Leg .

18

Okay, I think I know what you want now.

We have a class where you can measure the forces and moments of a specific reference frame and measure it in either local or global coordinates.
Try and find the AnyForceMomentMeasure and AnyForceMomentMeasure2 classes in your AnyBody Reference Manual. There you will also find a demo model showing how they work.

Best regards,
Bjørn

19

Hi Bjorn
i used this cod to find reaction force in Thigh result from Knee reaction
AnyForceMomentMeasure BaseJoint= {
AnyRefFrame &Point = Main.HumanModel.BodyModel.Right.Leg.Seg.Thigh.KneeJoint.RotNode;
AnyReacForce &JointForces = Main.Model.HumanModel.Right.Leg.Jnt.Knee.Constraints.Reaction;
AnyReacForce &Driver =
Main.Model.ModelEnvironmentConnection.Drivers.KneeDriverRight.Reaction;
};
But F=[0 0 0];
tanks

20

Hi @aneoo

As mentioned in the description of the AnyForceMomentMeasure class. "Only forces that are applied directly to this reference frame will be included." so I think you have a mis-match in the ref point and reaction forces you have included.

I think the AnyMomentMeasure2 might be more suited for you. Try and read their descriptions in the reference manual and see.

Best regards,
Bjørn