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108
Adams/Solver
Output Arguments
Extended Definition
Note: Adams/Solver (FORTRAN) - The NFORCE function is
available only with SYSFNC from the REQSUB and SENSUB
user written subroutines is not accessible from other user written
subroutines.
Adams/Solver (C++) - does not have support for the NFORCE
measure from the SYSFNC utility subroutine. Instead, you
should use the FX, FY, and FZ, measures. These can either be
used to measure the sum of forces on a single marker, or the sum
of forces transmitted by all connectors connecting a pair of
markers.
Unfortunately, these measures can not directly compute the force
transmitted between two I markers on an NFORCE and
something similar to FX(I1,J)-FX(I2,J) may be required.
ipar An integer array containing the parameter list for fncnam. It consists of any
valid list of parameters used in the associated Adams/Solver function, just
as they would appear in a dataset FUNCTION = expression.
nsize An integer variable specifying the number of values in ipar.
errflg A logical variable that returns true if an error has occurred during your call
to SYSFNC.
state A double-precision variable returned by SYSFNC. State is zero when the
iflag argument is set to true in the user-written subroutine, or when input
errors are found.
The SYSFNC subroutine provides system-state values (such as displacement and velocity) to user
subroutines, and defines and stores the Adams/Solver state variables on which the system state is
dependent.
SYSFNC returns one system state or stores the dependency of the user value on the system state. You use
the system state values to compute the instantaneous value of a user-defined function: Adams/Solver uses
the dependency on state variables to create the matrix of partial derivatives (Jacobian) of the system state
with respect to the Adams/Solver state variables. Adams/Solver uses the Jacobian matrix in several
analysis computations.
If you need to access several system states corresponding to one modeling element, you should use
SYSARY (see SYSARY).
SYSFNC requires that you specify system-state information as requested from Adams/Solver as a series
of function call specifications. This is almost as if you were using the function expression capabilities to