How to resolve this statistically inderminate problem

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1

Hi Sylvian,
I am Shreeganesh Sudhindra .I am currently working on the arm curl model. It is
my aim to improvise on the existing model and come up with an exo skelton for
the same. My issue is that while the model loads it says "Â Model Warning: Study
‘Main.ArmStudy’ contains more reaction forces than rigid-body degrees of freedom
of the segments. The model may be statically indeterminate. There are 25
reactions and only 24 rigid body degrees of freedom. " .I have tried reducing
the constraints one by one and I am still unable to figure out where I am going
wrong .I have attached my anyscript with this post.I would appreciate it if you
could throw some light onto this issue.Thank you.
Sincerely ,
Shreeganesh.S

[Non-text portions of this message have been removed]

2

Hi Shreeganesh,

The forum web site does not allow attaching directly a file to the posting.
There is a file section on the group where you can upload files. Please
upload you model there so we can look at it.

Best regards,

Sylvain, AnyBody Support

From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of shree ganesh
Sent: 27. februar 2009 09:09
To: anyscript@yahoogroups.com
Subject: [AnyScript] How to resolve this statistically inderminate problem

Hi Sylvian,
I am Shreeganesh Sudhindra .I am currently working on the arm curl model. It
is my aim to improvise on the existing model and come up with an exo skelton
for the same. My issue is that while the model loads it says " Model
Warning: Study ‘Main.ArmStudy’ contains more reaction forces than rigid-body
degrees of freedom of the segments. The model may be statically
indeterminate. There are 25 reactions and only 24 rigid body degrees of
freedom. " .I have tried reducing the constraints one by one and I am still
unable to figure out where I am going wrong .I have attached my anyscript
with this post.I would appreciate it if you could throw some light onto this
issue.Thank you.
Sincerely ,
Shreeganesh.S

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

3

Hi Sylvian,

I have uploaded the file as suggested.I would request you to have a

look at it and help me resolve the issue.Thank you.

Sincerely,

Shreeganesh . S

Earlier Message :

I am Shreeganesh Sudhindra .I am currently working on the arm curl

model. It is my aim to improvise on the existing model and come up

with an exo skeleton for the same. My issue is that while the model

loads it says " Model Warning: Study ‘Main.ArmStudy’ contains more

reaction forces than rigid-body degrees of freedom of the segments.

The model may be statically indeterminate. There are 25 reactions and

only 24 rigid body degrees of freedom. " .I have tried reducing the

constraints one by one and I am still unable to figure out where I am

going wrong .I have attached my anyscript with this post.I would

appreciate it if you could throw some light onto this issue.Thank you.

Sincerely ,

Shreeganesh. S

4

The name of the file is testfiledumb.any .

— On Sat, 2/28/09, shreeganesh_sastra <shreeganesh_sastra@yahoo.com> wrote:

From: shreeganesh_sastra <shreeganesh_sastra@yahoo.com>
Subject: [AnyScript] How to resolve this statistically inderminate problem
To: anyscript@yahoogroups.com
Date: Saturday, February 28, 2009, 12:03 AM

         Hi Sylvian,

I have uploaded the file as suggested.I would request you to have a

look at it and help me resolve the issue.Thank you.

Sincerely,

Shreeganesh . S

Earlier Message :

I am Shreeganesh Sudhindra .I am currently working on the arm curl

model. It is my aim to improvise on the existing model and come up

with an exo skeleton for the same. My issue is that while the model

loads it says " Model Warning: Study ‘Main.ArmStudy’ contains more

reaction forces than rigid-body degrees of freedom of the segments.

The model may be statically indeterminate. There are 25 reactions and

only 24 rigid body degrees of freedom. " .I have tried reducing the

constraints one by one and I am still unable to figure out where I am

going wrong .I have attached my anyscript with this post.I would

appreciate it if you could throw some light onto this issue.Thank you.

Sincerely ,

Shreeganesh. S

[Non-text portions of this message have been removed]

5

Hi Shreeganesh

I have made some changes in the model and uploaded it again using the name
“testfiledumbV2”

The problem was the following:

You have added 2 new segments, this adds 12 rigid body dof to the system

You then added three revolutejoints and a driver of one of them this is 16
kinematic constraints.

I have changed the should exo joint to be a spherical, the elbow to a
revolute and the palm to a cylindrical this gives in total 3+5+4=12
constraints which was needed… the driver I have removed.

When doing this kind of model it is always important to keep an eye on the
dof balance, we often recommend doing a small stick figure sketch of the
model showing the joint types etc…

Best regards

Søren, AnyBody Support

From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of shreeganesh_sastra
Sent: 27 February 2009 19:34
To: anyscript@yahoogroups.com
Subject: [AnyScript] How to resolve this statistically inderminate problem

Hi Sylvian,

I have uploaded the file as suggested.I would request you to have a

look at it and help me resolve the issue.Thank you.

Sincerely,

Shreeganesh . S

Earlier Message :

I am Shreeganesh Sudhindra .I am currently working on the arm curl

model. It is my aim to improvise on the existing model and come up

with an exo skeleton for the same. My issue is that while the model

loads it says " Model Warning: Study ‘Main.ArmStudy’ contains more

reaction forces than rigid-body degrees of freedom of the segments.

The model may be statically indeterminate. There are 25 reactions and

only 24 rigid body degrees of freedom. " .I have tried reducing the

constraints one by one and I am still unable to figure out where I am

going wrong .I have attached my anyscript with this post.I would

appreciate it if you could throw some light onto this issue.Thank you.

Sincerely ,

Shreeganesh. S

[Non-text portions of this message have been removed]

6

Hi Soren,
Thank a lot . I am running tests on the model .I will get back to you for more
queries.Thank you again .
Sincerely,
Shreeganesh Sudhindra

— On Mon, 3/2/09, AnyScript Support <anyscriptsup@anybodytech.com> wrote:

From: AnyScript Support <anyscriptsup@anybodytech.com>
Subject: RE: [AnyScript] How to resolve this statistically inderminate problem
To: anyscript@yahoogroups.com
Date: Monday, March 2, 2009, 4:03 PM

         Hi Shreeganesh

I have made some changes in the model and uploaded it again using the name

“testfiledumbV2�

The problem was the following:

You have added 2 new segments, this adds 12 rigid body dof to the system

You then added three revolutejoints and a driver of one of them this is 16

kinematic constraints.

I have changed the should exo joint to be a spherical, the elbow to a

revolute and the palm to a cylindrical this gives in total 3+5+4=12

constraints which was needed… the driver I have removed.

When doing this kind of model it is always important to keep an eye on the

dof balance, we often recommend doing a small stick figure sketch of the

model showing the joint types etc…

Best regards

Søren, AnyBody Support

From: anyscript@yahoogrou ps.com [mailto:anyscript@yahoogrou ps.com] On Behalf

Of shreeganesh_ sastra

Sent: 27 February 2009 19:34

To: anyscript@yahoogrou ps.com

Subject: [AnyScript] How to resolve this statistically inderminate problem

Hi Sylvian,

I have uploaded the file as suggested.I would request you to have a

look at it and help me resolve the issue.Thank you.

Sincerely,

Shreeganesh . S

Earlier Message :

I am Shreeganesh Sudhindra .I am currently working on the arm curl

model. It is my aim to improvise on the existing model and come up

with an exo skeleton for the same. My issue is that while the model

loads it says " Model Warning: Study ‘Main.ArmStudy’ contains more

reaction forces than rigid-body degrees of freedom of the segments.

The model may be statically indeterminate. There are 25 reactions and

only 24 rigid body degrees of freedom. " .I have tried reducing the

constraints one by one and I am still unable to figure out where I am

going wrong .I have attached my anyscript with this post.I would

appreciate it if you could throw some light onto this issue.Thank you.

Sincerely ,

Shreeganesh. S

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]