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Forums Anyscript.org http://forum.anyscript.org This is a discussion forum for anyscript.org community. en Mon, 21 May 2012 01:32:23 GMT vBulletin 60 http://forum.anyscript.org/images/misc/rss.jpg Forums Anyscript.org http://forum.anyscript.org Use a calibration matrix for Type4 forceplate http://forum.anyscript.org/showthread.php?t=3022&goto=newpost Tue, 15 May 2012 14:21:59 GMT Hello,

I tried to use a calibration matric that I had, and I don't unserstand the error message. I tried to specify my matrix in the EnvironmentAutoDetection folder.

Could you help me and explain how to use a calibration matrix in anybody?

I use AMS 5, and AMMRV1.4
Here attached is the model I use.

Thank you in advance,

Best regards,

Claude Pothrat

Attached Files

GaitLowerExtremity_Biometrics - Thomas - CALMATRIX.zip (7.27 MB)

]]> Debug model claude http://forum.anyscript.org/showthread.php?t=3022 a muscle recruiment problem http://forum.anyscript.org/showthread.php?t=3020&goto=newpost Mon, 14 May 2012 12:59:35 GMT Hi , I have a problem in the InverseDynamics analysis, I added a segment in the file Environment.any , and the Kinematics analysis is ok ,when i run... Hi ,
I have a problem in the InverseDynamics analysis, I added a segment in the file Environment.any , and the Kinematics analysis is ok ,when i run the InversDynamics analysis, it makes an error as below:
ERROR(OBJ.MCH.MUS4) : C:/D..s/A..r/A..a/A..y/A..x/A..0/A..n/E..s/S..n/SeatedHuman.main.any : Study.InverseDynamics : Muscle recruitment solver : solver aborted after maximum number of iterations.

Do you have any ideas to solve the problem?
The attached is the anybody files of AMMRV1.0 which i modified.
Thank you !
Best regards!
Sang

Attached Files

SeatedHuman.zip (47.2 KB)

]]> AnyBody Managed Model Repository chunleisang http://forum.anyscript.org/showthread.php?t=3020 A 6 bar constraint problem http://forum.anyscript.org/showthread.php?t=3019&goto=newpost Mon, 14 May 2012 11:56:24 GMT Hi there! I am having a hard time getting a 6 bar construct to run in AnyBody. In this model (any-file is attached) you can see 3 yellow bars,... Hi there!

I am having a hard time getting a 6 bar construct to run in AnyBody.

In this model (any-file is attached) you can see 3 yellow bars, which represent rigid segments. The three red bars are segments which will be replaced by elastic segments later. In the later application I am going to apply a load on the bottom right point and we will see how the stiffness of the red elements will influence the movement in the XY plane of the yellow elements. For now I just want to use rigid segments to demonstrate the problem.

Choosing the joint types I obtained a configuration that mathematically has as much constraints as degrees of freedom. It loads just fine, but when I execute the Kinematics or InverseDynamics analysis I am receiving an error.

Quote:

0) InverseDynamics (Operation: Main.MyStudy.InverseDynamics):
0.0) PreOperation (Operation: Main.MyStudy.InverseDynamics.PreOperation):
0.0.0) InitialConditions (Operation: Main.MyStudy.InitialConditions):
0.0.0) ...Design variables have been updated.
0.0.1) ...Load-time positions have been re-established.
WARNING(OBJ.MCH.KIN1) : C:/U..s/m..h/D..p/P..2/A..s/ASpringProblem6bar.any : MyStudy : Model is kinematically indeterminate : Position analysis failed : 41 independent constraints and 42 unknowns
- attemps to continue (attempt no. 1)
WARNING(OBJ.MCH.KIN1) : C:/U..s/m..h/D..p/P..2/A..s/ASpringProblem6bar.any : MyStudy : Model is kinematically indeterminate : Position analysis failed : 1 unsolvable constraint(s) found
- attempt successfull, kinematic analysis continues.
0.0.2) ...Kinematic analysis completed. The kinematic constraints have been resolved.
0.0.3) ...Initial conditions are fully updated.
0) Inverse dynamic analysis...
WARNING(OBJ.MCH.MUS1) : C:/U..s/m..h/D..p/P..2/A..s/ASpringProblem6bar.any : MyStudy : The muscles in the model are not loaded due to kinetically over-constrained mechanical system.
NOTICE(OBJ1) : C:/U..s/m..h/D..p/P..2/A..s/ASpringProblem6bar.any : MyStudy.InverseDynamics : No muscles in the model.
WARNING(OBJ.MCH.DYN2) : C:/U..s/m..h/D..p/P..2/A..s/ASpringProblem6bar.any : MyStudy : Model contains redundant constraint reactions :
List of redundant reactions:
0: Main.MyModel.Jnts.BAR1left.Constraints.Reaction[1]

ERROR(OBJ1) : C:/U..s/m..h/D..p/P..2/A..s/ASpringProblem6bar.any : MyStudy.InverseDynamics : No solution found : There are fewer unknown forces (muscles and reactions) than dynamic equations.
9) ...Inverse dynamic analysis completed
Total simulation time: 0.339

Obviously AnyBody is choking up on a redundant reaction force. I can imagine this construct to work in real life, but I do not know how to ascertain the correct joint configuration for AnyBody (after several days of contemplation I can't figure this problem out...). To see how a working model would look like, you find attached the same geometry with 5 bars, working flawlessly.

Has anyone an idea how to figure out the needed joint types?

Attached Files

	ASpringProblem6bar.any (3.8 KB)
	ASpringProblem5bar.any (3.2 KB)

]]> Debug model martink http://forum.anyscript.org/showthread.php?t=3019 Use c3d data http://forum.anyscript.org/showthread.php?t=3018&goto=newpost Fri, 11 May 2012 07:04:00 GMT Hello, I`m Shingo.I belong Japanese college　and new anybody user.
I　post for first time.
Actually, I think when I use "c3d file",make animation.
But, when run kinematics,there are many times error messages.
I confuse.Help me!!!!
I attach data ,now.Please, check this data.
This data is that I think move one point.So,I use one segment and function.

Attached Files

Shingo.zip (1,002.3 KB)

]]> AnyBody Modeling System Shingo http://forum.anyscript.org/showthread.php?t=3018 <![CDATA[Ground's reaction]]> http://forum.anyscript.org/showthread.php?t=3017&goto=newpost Mon, 07 May 2012 12:42:07 GMT Hello,

My question is about the ground's reaction. I would like to know if, in a classical gait analysis, with one platform, muscle force, joint reaction forces ect.. were computed only when the foot hit the plateform or also on others steps, where there is no plateforme?

More largely, is it possible to make an entire gait analysis without forceplate, but with a modelised ground?

In fact, I'm using a gait model, with a unique forceplate, and, looking at muscle forces for example, I sometimes see a high peak at the time the foot hit the plateform, and smaller peaks for the rest of the gait analysis each time the foot hit the ground. So I wonder if it was estimations from anybody?

Why aren't theses forces equal to those mesured on the forceplate?

I'm using AMMRV1.4

Thank you a lot for your help,

Best regards,

Claude Pothrat

Attached Files

GaitLowerExtremity_Biometrics.zip (4.40 MB)

]]> Debug model claude http://forum.anyscript.org/showthread.php?t=3017 AnyBody right protected content http://forum.anyscript.org/showthread.php?t=3016&goto=newpost Fri, 04 May 2012 19:55:43 GMT Hi guys,

I'm trying to understand what differentiates the AnyBody shoulder model from other shoulder models such as Delft Shoulder and Elbow model or NewCastle model.

From what I know, your recruitment algorithm (quadratic, min/max) are well known and defined in the literature. you did not created them, right ?

I want to know if anything in AnyBody is right protected (e.g. specific mathematical method or algorithm created by you), in such a way that other models would not be able to use it ?

Thank you.

Pierre ]]> AnyBody Managed Model Repository pothekid http://forum.anyscript.org/showthread.php?t=3016 Activity of a muscle with multiple fibres http://forum.anyscript.org/showthread.php?t=3015&goto=newpost Fri, 04 May 2012 19:12:30 GMT Hi,

I'm seeking for a way to estimate the activity of a muscle that has multiple fibres. Do I have to make an average of the activity in each fibre, or I must use a ratio of the distinct sums of muscles forces on muscle strength (e.g. sum(F1, F2, F3) / sum(Strength1, Strength2, Strength3)) ?

Thank you.

Pierre ]]> AnyBody Managed Model Repository pothekid http://forum.anyscript.org/showthread.php?t=3015 AnyBody is semi-static or dynamic analysis ? http://forum.anyscript.org/showthread.php?t=3014&goto=newpost Fri, 04 May 2012 14:33:31 GMT Hi guys, Some scientists think that AnyBody does semi-static analysis, because the equilibrium equations are computed at each time step. However,... Hi guys,

Some scientists think that AnyBody does semi-static analysis, because the equilibrium equations are computed at each time step. However, I think that it is dynamic analysis because the system computes velocity and acceleration from joint position.

Who is right ?

Thank you.

Pierre ]]> AnyBody Managed Model Repository pothekid http://forum.anyscript.org/showthread.php?t=3014 Optimization Method http://forum.anyscript.org/showthread.php?t=3013&goto=newpost Fri, 04 May 2012 03:39:27 GMT Hi everyone;
I created a musculoskeletal model containing over 190 muscles in Matlab. To verify the method, I'm going to build the same model in AMS and compare muscle activity. At the first step, I developed a smaller model containing 12 muscles in Matlab and AMS to test this approach. I used 'quadprog' function to solve redundancy in Matlab model and set muscle recruitment criteria to Polynomial with Power =2 in AMS. So both models should lead to the same result. But they don't.
Results of Matlab Model (Muscle Activity):
0.241951
0.172493
0.400292
-0.000000
-0.000000
0.215915
0.241951
0.172493
0.400292
0.000000
-0.000000
0.215915

Results of AMS (Muscle Activity):
0.0872
0
0.588
0
0
0.178
0.0872
0
0.588
0
0
0.178

Interestingly, I found that both results are correct and can satisfy equilibrium constraints. But cost function of Matlab results is 0.5903 and cost function of AMS results is 0.7701!
It seems the differences come from optimization algorithms. Is there a way to make muscle activities closer? What method AMS does use to solve optimization method?

Regards;
Thanks. ]]> AnyBody Modeling System majid_anyscript http://forum.anyscript.org/showthread.php?t=3013 Simulating co-contraction by extending the recruitment criteria http://forum.anyscript.org/showthread.php?t=3012&goto=newpost Thu, 03 May 2012 20:31:27 GMT Hi guys, More and more researchers think that antagonist co-contraction must be accounted for in musculoskeletal models in order for these models... Hi guys,

More and more researchers think that antagonist co-contraction must be accounted for in musculoskeletal models in order for these models to be closer to reality. I recently found an interesting paper that you might know:

Forster et al. (2004) Extension of a state-of-the-art optimization criterion to predict co-contraction, J. Biomech 37, 577-581

They use a shift parameter "xs" in the optimization function to create some co-contraction.

Do you think that this would improve the concordance between AnyBody forces estimations and experimental data ?

I think that adding this parameter in AnyBody would be easy and fast, but I'm not sure that I can do it easily.

Thank you.

Pierre ]]> AnyBody Managed Model Repository pothekid http://forum.anyscript.org/showthread.php?t=3012 Lower limb model scaling http://forum.anyscript.org/showthread.php?t=3011&goto=newpost Thu, 03 May 2012 12:06:22 GMT Hello, I made the lower limb gait model with Leg3D and sequence for optimizing bone geometry and marker place through iterative macro. I use... Hello,
I made the lower limb gait model with Leg3D and sequence
for optimizing bone geometry and marker place through iterative macro.
I use CreatMarkerClass.any and OptimizeAnthropometricsOnOff.any in Mocap
of ToolBox, and Run the 'RunMotionAndParameterOptimizationSequence'
Operation was completed, but the result is so curious.
Pelvis length is very long and femur is so short.
I want to resolve this problem in my model
This net address is lower limb model in my cloud stroage
https://files.ucloud.com/pf/D497082_6830739_19559
Please debug my model and give me a advice, thank you ]]> Debug model metaclavis http://forum.anyscript.org/showthread.php?t=3011 Ground recation and muscle force computing http://forum.anyscript.org/showthread.php?t=3010&goto=newpost Wed, 02 May 2012 08:10:11 GMT Hello, In a gait analysis, when I look at the output datas like Fm, I see that sometimes force is computed only when the foot is on the force... Hello,

In a gait analysis, when I look at the output datas like Fm, I see that sometimes force is computed only when the foot is on the force plate, and sometimes we can see activation all along the gait, but with an bigger amplitude at the time the foot is on the fore plate.
I was wondering in inverse dynamic gait analysis if muscle force was computed only when the foot is on the force plate or all along the walk :is there a ground reaction by default or do I have to make a model of it? ]]> AnyBody Managed Model Repository claude http://forum.anyscript.org/showthread.php?t=3010 Direct dynamic analysis http://forum.anyscript.org/showthread.php?t=3009&goto=newpost Wed, 02 May 2012 07:34:43 GMT Hello, I would like to know if it was possible to make direct dynamic analysis with anybody? Thank you, Best regards, Claude Pothrat Hello,

I would like to know if it was possible to make direct dynamic analysis with anybody?

Thank you,

Best regards,

Claude Pothrat ]]> AnyBody Managed Model Repository claude http://forum.anyscript.org/showthread.php?t=3009 human nervous system http://forum.anyscript.org/showthread.php?t=3008&goto=newpost Sun, 29 Apr 2012 14:30:10 GMT Hi,

I have basic question about model repository. Is this possible to show and use in modeling process the "representation" of human nervous system? Currently I'm working at some martial arts publication, and I would like to use the Anybody Modeling System to visualise the effects of various martial arts techniques on human body. In order to achieve this I need to include a model of the nervous system, for example to show the positions of vital points.

I would be very grateful for any suggestions.

Best regards, ]]> AnyBody Modeling System shinobi2501 http://forum.anyscript.org/showthread.php?t=3008 FDK - Different results: same model, different computers http://forum.anyscript.org/showthread.php?t=3007&goto=newpost Fri, 27 Apr 2012 14:53:21 GMT Hi, Michael Skipper Andersen has been so kind and shared his extensive FDK knee model with us in December. We ran it on 5 different computers and... Hi,

Michael Skipper Andersen has been so kind and shared his extensive FDK knee model with us in December. We ran it on 5 different computers and had to change the Kinematics.KinematicTol to 1e-5 in order for the model to run at all. The problem is that we are getting different results from different computers (except for 2, which seem to produce the same results) and one computer often aborts the calculations at different steps. We can't figure out why and Michael suggested to post that question in the forum...The model can be downloaded there: https://gigamove.rz.rwth-aachen.de/d...SYgexDcDpwT6Ei
The password is XXXXXXXXX

Also I was wondering, how you came up with the AgeFactor (0,9999999) and StrengthIndexLeg (1,53) for the Scaling of the muscles???

Thanks!
Katharina ]]> Debug model kaethen http://forum.anyscript.org/showthread.php?t=3007