# TRANSIENT

Command ElementSpecifies options for the transient simulation.

## Example

`TRA/MSTIFF,ERR=0.001, HINIT=1e-8, HMAX=.001`

## Format

__TRA__NSIENT/{__ABA__M, __VST__IFF,__MST__IFF}
, __ERR__OR = r
[, __HIN__IT = r ]
[, __HMA__X = r ]

## Arguments

- {
`ABAM`,`VSTIFF`,`MSTIFF`} - Dynamics problems can be classified into two categories: numerically stiff and nonstiff. Stiff problems are characterized by very large real part of the eigenvalues of the linearized equations of motion at a given configuration. The corresponding modes are generally over-damped, meaning that any transients die out very quickly.
`ERROR`- This represents the maximum error the integrator is allowed to make in
computing the displacement and velocity. MotionSolve monitors errors in both displacement and
velocity. Velocity tolerance is taken to be 1000 times the specified
tolerance value. Displacement tolerance is equal to the specified tolerance
value.Note:
`ERROR`is interpreted in terms of model units. For example, if you choose SI units, then a tolerance of 1.0e-3 implies an allowable error of 1 millimeter in displacement and 1 meter per second in velocity. `HINIT`- Initial step size to be used by the integrator.
`HMAX`- Maximum step size to be used by the integrator.