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Loads
2D/3D

Loads[bnum] returns the total external load applied to body bnum.
Loads[{bnum1, bnum2, ... }] returns the subset of the applied load vector associated with the bnumi.
Loads[All] returns the entire applied load vector.
Loads[Rest] returns the subset of the applied load vector that is associated with derivatives of generalized coordinates, such as the extra variables introduced by cam constraints.
Loads[sym] returns the element of the load vector associated with coordinate sym.
Loads[{sym1, ... , symn}] returns the subset of the applied load vector associated with several coordinate symbols.

• The symi must be location coordinates as returned by Location[bnum] or, if the current Modeler3D solution method is Angular, angular velocity coordinates as returned by Omega[bnum].
• The following options can be givens:

• The default setting Coordinates->Automatic returns the loads in the current default coordinate system.
• If Coordinates->Automatic is given and the current coordinate system is Euler, a list of seven loads is returned in Euler coordinates.
• If either the Global or Local setting is given for Coordinates, the argument must be a single body number bnum. In this case Loads returns a two-element list of the form {force, moment}.
Type->Reaction may be given to return the total reaction force applied by all constraints to the body.
Type->Dynamic may be given to return the total inertial load on the body.
• For example: Loads[n, Type->Applied] + Loads[n, Type->Dynamic] + Loads[n, Type->Reaction] /. SolveMech[ ... , Solution->Dynamic] should always return a zero vector.
• See also:
Constraints.

Further Examples

Load the Modeler2D package and define a simple model.

Here are the loads applied to the x, y, and Theta coordinates of the link body.

Here is the reaction force applied by the constraints to the X3 coordinate (which is the x coordinate of the link body).

Here are the dynamic force and moment acting on the link body, with the force given in the local coordinate system of the link body.

See HelpModel2D.


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