SOLVERS Home: Base Excitation

Description

Specifies the base excitation for the Linear Transient Dynamic and Nonlinear Transient Dynamic solvers.

Base excitation can be applied as a base acceleration, base velocity or base displacement according to a direction vector and corresponding excitation vs Time tables. The base is taken to be the restrained nodes in the model.

The calculated displacement, velocity and acceleration responses can be set to be either relative to the movement of the base or the total response (see Results Options: Displacement Tab).

Type

The type of base excitation can be selected from one of acceleration vs time, velocity vs time or displacement vs time. These all describe the instantaneous excitation at the restrained nodes.

Table Factor

Components in the global XYZ axes that define the direction and scale factor of the base excitation applied to restrained nodes.

Time Table

Acceleration, velocity or displacement vs time table that describes the excitation as a function of time. The Table Factor scales the data contained in the table.

Initial Disp / Initial Vel / Initial Acc

Initial displacements, velocities and accelerations at restrained nodes that are consistent with the initial base excitation. For example, the initial velocity value describes the state of a moving frame just prior to it being subjected to braking deceleration at the beginning of simulation.