Reference axis in universal and sperical joints

Archive AnyScript Yahoo archive
1

Dear Soren:

I have a simple question about the reference axis in universal or
spherical joints. For example, the joint is defined as:

AnyUniversalJoint MCP =
{ Axis1 = y;
Axis2 = z;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

AnySphericalJoint MCP =
{ Orientation.Type = RotVector;
Orientation.Axis1 = y;
Orientation.Axis2 = z;
Orientation.Axis3 = x;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

My question is about the reference frame of the Axis1,2,3; are they
defined on Body_A, Body_B, or in the global reference frame?

Regards,

John Wu

2

Dear John

These axes are defined in the first mentioned reference frame of the joint,
so in this case it will be the Body_A reference.

Best regards

Søren, AnyBody Support

From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of johnzengwu
Sent: 09 January 2009 16:19
To: anyscript@yahoogroups.com
Subject: [AnyScript] Reference axis in universal and sperical joints

Dear Soren:

I have a simple question about the reference axis in universal or
spherical joints. For example, the joint is defined as:

AnyUniversalJoint MCP =
{ Axis1 = y;
Axis2 = z;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

AnySphericalJoint MCP =
{ Orientation.Type = RotVector;
Orientation.Axis1 = y;
Orientation.Axis2 = z;
Orientation.Axis3 = x;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

My question is about the reference frame of the Axis1,2,3; are they
defined on Body_A, Body_B, or in the global reference frame?

Regards,

John Wu

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

3

Soren:

Thanks!

John

— In anyscript@yahoogroups.com, AnyScript Support
<anyscriptsup@…> wrote:
>
> Dear John
>
>
>
> These axes are defined in the first mentioned reference frame of
the joint,
> so in this case it will be the Body_A reference.
>
>
>
> Best regards
>
> Søren, AnyBody Support
>
>
>
> _____
>
> From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com]
On Behalf
> Of johnzengwu
> Sent: 09 January 2009 16:19
> To: anyscript@yahoogroups.com
> Subject: [AnyScript] Reference axis in universal and sperical joints
>
>
>
> Dear Soren:
>
> I have a simple question about the reference axis in universal or
> spherical joints. For example, the joint is defined as:
>
> AnyUniversalJoint MCP =
> { Axis1 = y;
> Axis2 = z;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> AnySphericalJoint MCP =
> { Orientation.Type = RotVector;
> Orientation.Axis1 = y;
> Orientation.Axis2 = z;
> Orientation.Axis3 = x;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> My question is about the reference frame of the Axis1,2,3; are they
> defined on Body_A, Body_B, or in the global reference frame?
>
> Regards,
>
> John Wu
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

4

Soren:

Thanks!

John

— In anyscript@yahoogroups.com, AnyScript Support
<anyscriptsup@…> wrote:
>
> Dear John
>
>
>
> These axes are defined in the first mentioned reference frame of
the joint,
> so in this case it will be the Body_A reference.
>
>
>
> Best regards
>
> Søren, AnyBody Support
>
>
>
> _____
>
> From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com]
On Behalf
> Of johnzengwu
> Sent: 09 January 2009 16:19
> To: anyscript@yahoogroups.com
> Subject: [AnyScript] Reference axis in universal and sperical joints
>
>
>
> Dear Soren:
>
> I have a simple question about the reference axis in universal or
> spherical joints. For example, the joint is defined as:
>
> AnyUniversalJoint MCP =
> { Axis1 = y;
> Axis2 = z;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> AnySphericalJoint MCP =
> { Orientation.Type = RotVector;
> Orientation.Axis1 = y;
> Orientation.Axis2 = z;
> Orientation.Axis3 = x;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> My question is about the reference frame of the Axis1,2,3; are they
> defined on Body_A, Body_B, or in the global reference frame?
>
> Regards,
>
> John Wu
>
>
>
>
>
> [Non-text portions of this message have been removed]
>