AERROR=r | Respecifies the maximum acceleration error Adams Solver (FORTRAN) is to allow for each time step. Range: AERROR > 0 |
ALIMIT=r | Respecifies the maximum angular increment Adams Solver (FORTRAN) is to allow per iteration. The default units for ALIMIT are radians. To specify ALIMIT in degrees, add a D after the value. Range: ALIMIT > 0 |
AMAXIT=i | Respecifies the maximum number of iterations Adams Solver (FORTRAN) is to allow for finding accelerations at a point in time. Range: AMAXIT > 0 |
APATTERN=c1[:...:c10] | Respecifies as many as ten character strings that together establish the pattern for evaluating the Jacobian matrix during the modified Newton-Raphson solution for the accelerations. For each iteration, T or TRUE indicates that Adams Solver (FORTRAN) is to evaluate the Jacobian, and F or FALSE indicates that Adams Solver (FORTRAN) is not to evaluate the Jacobian. Thus, cj determines whether or not Adams Solver (FORTRAN) is to evaluate the Jacobian at the jth iteration. If necessary, Adams Solver (FORTRAN) repeats the pattern of evaluations until it reaches the maximum number of iterations (AMAXIT). The number of T’s or TRUE’s and F’s or FALSE’s together must be at least one and no more than 10. |
DEFAULT | Resets the kinematic analysis simulation parameters to their default settings, namely: AERROR=1.0E-4 ALIMIT=30D AMAXIT=25 APATTERN=T:T:T:T:T:T:T:T:T:T, (evaluate the acceleration Jacobian at every iteration) ERROR=1.0E-4 MAXIT=25 PATTERN=T:T:T:T:T:T:T:T:T:T, (evaluate the position Jacobian at every iteration) TLIMIT=1.0E10 (no limit) |
ERROR=r | Respecifies the maximum displacement error Adams Solver (FORTRAN) is to allow for each time step. Range: ERROR > 0 |
HMAX=r | Defines the maximum time step that the KINEMATICS solution is allowed to take. When performing kinematic simulations on systems with parts that are rotating at very high speeds (at or more than one revolution per time step), it is possible for the kinematic to fail or provide inaccurate results because of lack of information on the system between output step solutions. The HMAX value can be used to limit the time between solution steps without having to specify a large number of output steps. |
LIST | Lists the current values of the data in the KINEMATICS statement. |
MAXIT=i | Respecifies the maximum number of iterations Adams Solver (FORTRAN) is to allow for finding the displacements at a point in time. Range: MAXIT > 0 |
PATTERN=c1[:...:c10] | Respecifies as many as ten character strings that together establish the pattern for evaluating the Jacobian matrix during the modified Newton-Raphson solution for the displacements. For each iteration, T or TRUE indicates that Adams Solver (FORTRAN) is to evaluate the Jacobian and F or FALSE indicates that Adams Solver (FORTRAN) is not to evaluate the Jacobian. Thus cj determines whether or not Adams Solver (FORTRAN) is to evaluate the Jacobian at the jth iteration. If necessary, Adams Solver (FORTRAN) repeats the pattern of evaluations until it reaches the maximum number of iterations (MAXIT). The number of T’s or TRUE’s and F’s or FALSE’s together must be at least one and no more than ten. |
TLIMIT=r | Respecifies the maximum translational increment Adams Solver (FORTRAN) is to allow per iteration. Range: TLIMIT > 0 |
Tip: | ■Using the PATTERN argument to request less frequent evaluations of the Jacobian matrix may decrease the computation time, thereby decreasing the cost and improving the response time. However, it could also have the opposite effect since more iterations may be required to reach the solution with a stale Jacobian matrix. ■Use the ALIMIT and TLIMIT arguments to limit the increments of the displacement variables if Adams Solver (FORTRAN) fails to converge to a solution or converges to an undesirable configuration. This lessens the position change on successive iterations, and tends to keep the solution closer to the previous configuration. |