Prescribed Acceleration
The Prescribed Acceleration node adds a boundary or domain condition where the acceleration is prescribed in one or more directions. The prescribed acceleration condition is applicable for Time Dependent and Frequency Domain studies. With this boundary condition it is possible to prescribe a acceleration in one direction, leaving the beam free in the other directions.
The Prescribed Acceleration node is a constraint, and overrides any other constraint on the same selection.
Coordinate System Selection
Specify the coordinate system to use for specifying the prescribed translational/rotational acceleration. See the section Coordinate System Selection for Edge Load. Depending on the selected coordinate system, the acceleration components change accordingly.
Prescribed Acceleration
Select one or all of the Prescribed in x direction, Prescribed in y direction, and for 3D models, Prescribed in z direction check boxes. Then enter a value or expression for ax, ay, and for 3D models, az.
Prescribed Angular Acceleration
For 2D models, to define a prescribed angular acceleration select the Prescribed in out of plane direction check box and enter a value or expression for 2θ0z/∂t2.
For 3D models, to define a prescribed angular acceleration for each space direction (x, y, and z), select one or all of the Prescribed around x direction, Prescribed around y direction, and Prescribed around z direction check boxes and enter a value or expression for in each 2θ0x/∂t2, 2θ0y/∂t2, or 2θ0z/∂t2 field.
You can add a Harmonic Perturbation subnode for specifying a harmonic variation of the values of the prescribed acceleration in a frequency domain analysis of perturbation type.
Prescribed Velocity can not be used as a weak constraint.
Location in User Interface
Context Menus
Beam>Line Constraints>Prescribed Acceleration
Beam>More Constraints>Prescribed Acceleration (Point)
Ribbon
Physics tab with Beam selected:
Edges>Line Constraints>Prescribed Acceleration
Points>More Constraints>Prescribed Acceleration