Vertex load definition

@VERTEX_LOAD_DEFINITION {
@VERTEX_LOAD_NAME {GVtxLName} {
@VERTEX_NAME {VertexName}
@APPLIED_LOAD_LIST {ApLod1, ApLod2, ...}
@COMMENTS {CommentText}
}
}

Introduction

A vertex load is a set of known, time varying concentrated forces and moments applied at vertex VertexName. Typically, a vertex load is applied to a structural element, in which case, vertex VertexName is one of the vertices of this structural element.

Vertex VertexName could be the vertex defining the relative motion of a joint. For instance, a torque can be applied at a the vertex defining the relative rotation of a revolute joint. In this case, the applied torque is equivalent to a set of torques of equal magnitudes and opposite signs applied to the two components of the revolute joint. This would model the situation of a motor located at the revolute joint applying equal and opposite torques to the rotor and stator, i.e., to the two components of the revolute joint.

Similarly, a force can be applied at a the vertex defining the relative displacement of a prismatic joint. In this case, the applied force is equivalent to a set of forces of equal magnitudes and opposite signs applied to the two components of the prismatic joint. This would model the situation of an actuator located at the prismatic joint applying equal and opposite forces to the two components of the prismatic joint.

NOTES

  1. The applied loading used in conjuntion with this vertex load consists of a number of applied loads, ApLod1, ApLod2, etc., that must be introduced by one of the following keywords: @CONCENTRATED_FORCE_ALONG_i1, @CONCENTRATED_FORCE_ALONG_i2, @CONCENTRATED_FORCE_ALONG_i3, @CONCENTRATED_MOMENT_ABOUT_i1, @CONCENTRATED_MOMENT_ABOUT_i2, or @CONCENTRATED_MOMENT_ABOUT_i3.
  2. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.