Orientation of Part (MOSES)

Hi,

I would like to ask regarding how the orientation in MOSES works, and what is the difference between using the following

Method 1:

"in dat file"


$ ---------- INSERT BARGE DATA ------------
&DESCRIBE BODY %VNAME
&INSERT barge.dat

$ ---------- INSERT CARGO DATA ------------
&DESCRIBE part %CARGO% -move 82.79 0 %vdepth%+3.295 0 0 90
&INSERT CPP_JKT.DAT

and

Method 2:

"in "CPP_JKT.dat" converted jacket data

&describe body jacket cpp_jkt -move 82.79 0 %vdepth%+3.295 0 0 90

and 

Method 3:

"in ".cif " file

INMODEL

MEDIT

$
&DESCRIBE body cpp_jkt
&INSTATE -MOVE cpp_jkt -move 82.79 0 %vdepth%+3.295 0 0 90

END_MEDIT

My question is which of this method is correct for reorientation of cargo on top barge deck. I found that the part did not move using method 3 and 2. Appreciate for some clarification on how MOSES reposition "part" or "body"

  • I suspect this is a transportation analysis. In such analyses everything belongs to one body, i.e. the barge, while the jacket is a part.

    The &DESCRIBE PART can be issued either before you read the jacket model with &INSERT, or from within the .dat file that contains the jacket description as done in Method 1.

    The jacket will not move in Method 2 because the jacket will always be a part in the analysis and not a body. I see you are using &DESCRIBE BODY jacket -move in Method 2; this is wrong. I always use &DESCRIBE PART %cargo% -move to position the cargo onboard as you are doing in Method 1.

    Finally, in Method 3 you are issuing &DESCRIBE BODY for the jacket again; not good. &INSTATE is not be used for positioning cargo, but bodies in the analysis; i.e. the barge. This is mentioned in the Reference Manual, page 134. You need to read the manual first.

    Answer Verified By: Naim Hassan 

  • Dear Spiro, Thankyou for the clarification.

    A followup question is regarding orientation of origin. As we all know, for example a jacket model is model as per its body origin (0,0,0) or elevation, but after inserting the jacket data in MOSES, can i reorient/reselect the reference node (node of which MOSES refer to when repositioning) so that the origin is at the bottom (mudmat center point origin) for example? is it possible to do so in MOSES or do i have to edit the datagen file directly from SACS precede? Thanks

  • I would suggest repositiong the jacket in datagen prior to exporting. This way, once in MOSES you would not need any additional commands. To answer your question, you cannot redefine the reference node.

    Answer Verified By: Naim Hassan