Sometimes the components described by a multibody dynamics assembly are attached a common “ground”, which is not fixed in space but has a uniform movement. Use Base Motion (
) to specify the motion (displacement, velocity, or acceleration) of the environment to which the assembly is connected. The
Base Motion node can then be referenced in the selection of source attachment for the joints and springs that connect to the base.
This section is available when Velocity or
Acceleration is selected as the
Base motion type. Then enter a value for
ub0 to prescribe a nonzero initial value for the base displacement. The values are given in the coordinate system selected in the
Coordinate system selection section.
This section is available when Acceleration is selected as the
Base motion type. Then enter a value for
vb0 to prescribe a nonzero initial value for the base velocity. The values are given in the coordinate system selected in the
Coordinate system selection section.