XANSYS Message: 4151 [Go back to message list] [bookmark on del.icio.us]
No rating yet Subject: Re: PIPE16 mass properties Author: John Swanson Date: 1999-08-24 10:35:00> -----Original Message----- > From: Peter Kohnke > Sent: Tuesday, August 24, 1999 9:53 AM > To: John Swanson > Subject: RE: [xansys] PIPE16 mass properties
> John-
> You are correct, the mass matrix is fine. This user is apparently > looking at > the elmass information, which does put all mass at the center point of > the element. > Thus, for a one element problem, there would be no reported moments. > But > these are approximate. Again, the mass matrix is fine. I suggest you > have the > user do a modal analysis and/or study the reactions while under > gravity.
> Peter K. > -----Original Message----- > From: John Swanson > Sent: Tuesday, August 24, 1999 6:20 AM > To: Peter Kohnke > Subject: FW: [xansys] PIPE16 mass properties
> Do line elements (such as the pipe16) have zero rotational > inertia > about the axis? I don't think so... > John
> -----Original Message----- > From: Rolf Hildre [SMTP:Rolf.Hildre@e...] > Sent: Tuesday, August 24, 1999 5:23 AM > To: 'xansys mailing group' > Subject: [xansys] PIPE16 mass properties
> From: Rolf Hildre
> Hi all,
> Does anybody out there know how ANSYS calculates PIPE16 mass > properties? > The help system doesn't help much in this case. > A simple test with a single element seems to indicate that mass and CG > is correct, while mass moments of inertia are not. Does ANSYS assume > a > point mass (without rotational inertia) at the CG? For a single > element > all mass moments of inertia are listed as zero! Are we missing > anything? Any workarounds?