Welcome to Adams/Solver Subroutines - Kxcad.net

Welcome to Adams/Solver Subroutines
xmatrx A double-precision thirty-by-thirty array that returns to Adams/Solver the
second derivatives of the constraint expression with respect to the
principal axes variables. The second derivatives UCOSUB returns the
value of idrsel(3):
Extended Definition
If idresel (3) is:
xmatrx is:
0
No evaluation
1
xmatrx(m,n) =
The letter q represents the variables, t stands for time, and F refers to the
constraint equation. If any of the elements of xmatrx are symbolically
zero, they need not be defined.
The standard constraint statements are usually adequate for defining commonly occurring displacement
constraints between marker pairs. For displacement constraint combinations not available through these
statements or for constraints involving velocity variables, you should use the FUNCTION=USER()
argument in the UCON statement, and write a UCOSUB to define the constraint. The constraints defined
in the subroutine can incorporate velocity variables. You can select as many as thirty displacements
and/or velocities of part principal axes to be the variables in the constraint relationship for a UCON
statement. Each UCON statement removes one degree of freedom from the system.
At every evaluation step, Adams/Solver evaluates UCOSUB to determine the value of the constraints.
During the initialization of UCOSUB, the utility subroutine UCOVAR should be called to declare the
variables used in the relationship. PART statement identifiers and type codes identify the variables. To
preserve the generality of UCOSUB, the identifiers and the type codes can be passed through the
parameter list of the UCON statement.
For the formulation of constraints, you cannot access information with SYSARY or SYSFNC. You can,
however, access information with AKISPL or CUBSPL (see AKISPL, CUBSPL, and UCOVAR). You
must set up UCOSUB system dependencies using UCOVAR, and use system information from the q
parameter only.
For each system constraint, Adams/Solver formulates a governing constraint equation. For standard
Adams/Solver constraint statements, symbolic partial derivatives of the constraint equation with respect
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