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03-19-2016 08:41 AM

Hello together,

does anybody know how I can define a new coordinate system of my main axes to moment of inertia (black coordinate system in the picture).

I would like to have that 1 ,2 ,3 is parallel to my standard coordinate system x, y ,z.

I need to have the parallel system due to steiner sentence in order to charge the momen of interia parallel to a main turning axle.

Thank you for your response.

Regards

Marcello

6 REPLIES

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03-21-2016 03:46 AM

Hi,

You have to show center of mass and you can connect a coordinate system to it.

Here is a video:

BR,

Imics

http://solidedgest.wordpress.com/

http://solidedgest.wordpress.com/

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03-21-2016 02:03 PM

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03-21-2016 02:28 PM - edited 03-21-2016 02:30 PM

I'm pretty sure Imics did it in ordered. Don't you know what hagyomanyos means!?

Edit: Yeah, the commands are clearly ordered.

Bruce Shand

ST9 MP8 - Insight - Win10 - K4200

ST9 MP8 - Insight - Win10 - K4200

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03-22-2016 02:57 AM

Hello,

Thank you a lot for this video.

But my question is, I would like to have axle z and axle 1 (moment of interia) parallel.

Why does Solid Edge turn the coordinate system (1,2,3) just because the part has a bevel geometrie?

Because in the assembly the z axle is parallel to my main turning axle. That means, that axle 1 also have to be parallel that i can use steiner´s law to calculate the main moment of interia.

Thanks

Regards

Marcello

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03-22-2016 08:04 AM

On the physical properties dialog box there is a drop-down where you can select a different co-ordinate system for properties to be calculated.

If you change this to the new one created according to the (excellent) video does it give the results required ?

HP Z420 16GB RAM

Quadro K4000

ST7 MP10 on Windows 7 Pro 64.

Quadro K4000

ST7 MP10 on Windows 7 Pro 64.

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03-22-2016 04:23 PM

Hello Marcello,

The black axes in your picture are simply the three principal axes of inertia. These are also listed in the Physical Properties dialog box under the Principal tab. Along with that are the three principal moments of inertia about those three principal axes. You cannot rotate those black axes - they are what they are as a consequence of the geometry.

You are interested in the mass moment of inertia about the axis of rotation. So simply define a coordinate system at that axis and then re-run the Physical Properties command. In the dialog box that pops up, just select the coordinate system you defined at the axis of rotation from the drop down list under Coordinate system: near the top-left of the dialog box. You can then read the mass moments of inertia off as appropriate. They will be about the three axes defined by that coordinate system. No need for the parallel axis theorem (Steiner's law) as that is already taken care of by Solid Edge.

Cheers,

Chris

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