Search found 115 matches

by Krishnakumar Sankar
Tue Oct 31, 2017 5:10 am
Forum: OpenSim
Topic: Contact forces between rigid bodies
Replies: 1
Views: 608

Contact forces between rigid bodies

Hi
1. If two rigid bodies need to come in contact,will using Hunt crossely force be a suitable method.

2.If so could you please post a sample code with values for parameters like dissipation constant,Stiffness constant and all the three frictions



Thank you
by Krishnakumar Sankar
Tue Oct 31, 2017 5:04 am
Forum: OpenSim
Topic: Elastic Foundation model
Replies: 8
Views: 1783

Elastic Foundation model

Hi I would like to know about Elastic foundation forces method to execute a grasp activity of a glass. 1.What type of mesh I should create for the object. 2.Should the mesh be created on the finger segments too ? . 3.For understanding,could you post a sample html code for elastic foundation model Th...
by Krishnakumar Sankar
Wed Oct 11, 2017 10:23 pm
Forum: OpenSim
Topic: Thumb muscles
Replies: 5
Views: 440

Re: Thumb muscles

Static optimization of a muscle before filter and after filter produces entirely different range of muscle forces.Probably after using the filter at 6 Hz,the results are sensible.What could be the possible reason.Thanks in advance
by Krishnakumar Sankar
Mon Oct 09, 2017 7:52 pm
Forum: OpenSim
Topic: Thumb muscles
Replies: 5
Views: 440

Re: Thumb muscles

tkuchida wrote:How are you generating your simulation?
Inverse dynamics simulation would solve the purpose ?
by Krishnakumar Sankar
Sun Oct 08, 2017 11:13 pm
Forum: OpenSim
Topic: Thumb muscles
Replies: 5
Views: 440

Thumb muscles

Hai I would like to see the effect of FPL by cutting off the APL muscle strength and vice versa.So if I cut off a muscle strength by zeroing the isometric force of the muscle,the particular movement (say flexion ) should not happen when i adjust the flexion coordinates or instead the joint should be...
by Krishnakumar Sankar
Fri Aug 04, 2017 5:43 pm
Forum: OpenSim
Topic: Coefficient of restitution and Dissipation Constant
Replies: 1
Views: 270

Coefficient of restitution and Dissipation Constant

Hi


Are Coefficient of restitution and Dissipation Constant same?.It sounds same because in both cases energy is dissipated to the material in a certain velocity before it actually restores its position.Could you please clarify?

Thanks
by Krishnakumar Sankar
Thu Aug 03, 2017 10:25 pm
Forum: OpenSim
Topic: Values of Dissipation Constant
Replies: 1
Views: 134

Values of Dissipation Constant

Hi Suppose if we choose 3 different objects like ball,glass and key for simulation in wrist model,the dissipation constant for rigid objects like Key and Glass should be as less as 0.2 and ball should be near to 1 like 0.8 or 0.9.Are these values correct for choosing dissipation constant values.Coul...
by Krishnakumar Sankar
Mon Jul 24, 2017 11:03 pm
Forum: OpenSim
Topic: Inverse dynamics and Static optimization
Replies: 3
Views: 184

Re: Inverse dynamics and Static optimization

Thank you sir.I will have a look.

But will the ID results be reliable at this case.Because if I correct the Constraint violations ,the ID results will remain same right ?
by Krishnakumar Sankar
Mon Jul 24, 2017 10:44 pm
Forum: OpenSim
Topic: Inverse dynamics and Static optimization
Replies: 3
Views: 184

Inverse dynamics and Static optimization

Hi
Do the results of SO and ID depend on each other.I calculated joint moments of fingers for a grasp activity.Static Optimization has some Constraint violation.No Question is can I proceed with the ID results.


Thank you
by Krishnakumar Sankar
Thu Apr 06, 2017 6:34 pm
Forum: OpenSim
Topic: Contact Spheres on bone segments or muscles segments
Replies: 3
Views: 270

Re: Contact Spheres on bone segments or muscles segments

Thank you sir.

I get joint moment and muscle moment results well but my static optimization undergoes some constraint violation.That doesnt affect joint moment and muscle moments results right ?