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Velocity
2D/3D

Velocity[point] returns the global velocity vector, {dX, dY} (2D) or {dX, dY, dZ} (3D) of the specified point.
Velocity[bnum, lpnt] is interpreted as Velocity[Point[bnum, lpnt]].
Velocity[bnum] returns the velocity and angular velocity coordinates of body bnum in a flat list.
• The bnum argument can take any of the forms accepted by
Loads to obtain the velocity coordinates of multiple bodies.
Velocity is also a setting for the Solution option for several Mech functions.
Solution->Velocity causes such functions to seek a solution for the location and velocity of the current model.

Velocity[All] returns the entire vector of velocity coordinates.
• The behavior of Velocity[bnum] varies depending on whether the current solution method is Angular or Euler.
• To use Velocity[bnum], bnum must be the number of a body in the current model.
• In Modeler2D with the Euler solution method, Velocity[2] returns {X2d, Y2d, Ei2d, Ej2d}, but with the Angular solution method, Velocity[2] returns {X2d, Y2d, CapitalTheta2d}.
• In Modeler3D with the Euler solution method, Velocity[2] returns {X2d, Y2d, Z2d, Eo2d, Ei2d, Ej2d, Ek2d}, but with the Angular solution method, Velocity[2] returns {X2d, Y2d, Z2d, CapitalOmegax2, CapitalOmegay2, CapitalOmegaz2}.
Velocity[sym] or Velocity[{sym, ... }] returns the velocity coordinates associated with the specified location coordinates sym.
• The alternatives to the Velocity setting for the Solution option are
Location, Acceleration, Static, Kinematic, and Dynamic.
• See also: BodyEnergy, Omega, RelativeVelocity, SolveMech.

Further Examples

Load the Modeler2D package and define a simple model.

Here is an expression representing the velocity vector of a point at {0, 5} on the crank.

Here are the variables used to represent the linear and angular velocity of the link body.

Here is a solution to the current model with velocity terms included.

Here is the numerical value of the velocity of a point at {3, 0} on the crank.

See HelpModel2D.


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