Here is a sample deck set-up for doing a CMR of RS solution for a RecurDyn flexible body.
$
SOL 103
CEND
$
$ CASE CONTROL
$
TITLE = Solution 1
ECHO = NONE
MBDEXPORT(RECURDYNRFI,FLEXBODY=yes, FLEXONLY=no) $ Creates RFI file
RSMETH=100 $ Points to 1st modal extraction method
METHOD = 200 $ Points to 2nd modal extraction method
$
DISPLACEMENT(PLOT) = ALL
STRESS(PLOT,CORNER) = ALL
$
$ BULK DATA
$
BEGIN BULK
DTI,UNITS,1,KG,N,MM,S $ Units used in MBD solve
$
$ SOLUTION CARDS
$
EIGRL, 100, , 400.00 $ Eigenvalue extraction method for 1st modes
EIGR, 200, AHOU, , , , 150 $ Eigenvalue extraction method for 2nd modes
SPOINT,100001,thru,100101 $ SPOINTS > 1st Modes
QSET1,,100001,thru,100101 $ QSET points same as SPOINTS
PARAM AUTOSPC YES
PARAM GRDPNT 0
PARAM POST -2
$
$ Flex body connection ASET points
USET1, U6, ,123456,26
USET1, U6, ,123456,35
USET1, U6, ,123456,44
USET1, U6, ,123456,53
USET1, U6, ,123456,62
USET1, U6, ,123456,71
USET1, U6, ,123456,80
USET1, U6, ,123456,89
$
$ Rest of model …
$
•Case Control Section
•MBDEXPORT(RECURDYNRFI,FLEXBODY=yes,FLEXONLY=no)
o Used to request calculation of the flex body in RecurDyn RFI file format
•RSMETH = 100
o This card points to the EIGRL card used for the first modal solution
•METHOD = 200
o This card points to the EIGR card used for the second modal solution
•Bulk Data Section
•DTI,UNITS,1,KG,N,MM,S
o This defines the set of units used and is required by the MBD solver
•EIGRL, 100, , 400.00
o This is the extraction method for the step-1 modal solve. Recall that you want the upper frequency limit to be about twice the maximum frequency of interest in the structure
•EIGR, 200, AHOU, , , , 150
o This is the extraction method for the step-2 modes
o The Automatic Householder option is recommended since it will assure that you get all the modes of the reduced component
o ND (or 150 in this example), is the desired number of eigenvectors, this number has to be greater that the number of ASET plus the number of step-1 modes
o In this example, there are 8 ASET points, each with 6 DOF, and about 74 step-1modes, so we need 122 step-2 modes (8 x 6 + 74, it's OK to request more)
•SPOINT,100001,thru,100101
o SPOINTs than expected step-1 modes, it doesn't hurt to have too many
o The numbering range has to be outside the range of grid points
•QSET1,,100001,thru,100101
o The QSET card puts the SPOINTs in the q-set
o Use the same range as the SPOINTs
•USET1, U6, ,123456,grid number
o The ASET identifies the connection grids and the DOF at those grids. In this case all 6 DOF are used as connection DOF, which assumes that all will be connected by fixed joints in the MBD model