6.3.2.6. Rotation
A rotational force generates three orthogonal torques about the reference marker. This force applies action torques to the action body, and the corresponding reaction torques are applied to the base body. The position and orientation of base marker are not used because the direction of force is defined by the reference marker. It is used when it is convenient to work with the three orthogonal torque components or when the direction of the torque is different than about a rotational axis.
6.3.2.6.1. Modeling Options
The user can create a force entity as follows.
Point, Point
Point: Selects a point on a base body. This point defines a location on which the reaction force is applied.
Point: Selects a point on an action body. This point defines a location on which the action force is applied.
Body, Body, Point, Point
Body: Selects a base body of rotational force.
Body: Selects an action body of rotational force.
Point: Selects a point on a base body. This point defines a location on which the reaction force is applied.
Point: Selects a point on an action body. This point defines a location on which the action force is applied.
6.3.2.6.2. Properties
Figure 6.261 Rotational property page
The magnitude of the rotational force is calculated according to the following equations:
\(\begin{aligned} & {{T}_{a}}={{T}_{x}}\cdot {{x}_{rm}}+{{T}_{y}}\cdot {{y}_{rm}}+{{T}_{z}}\cdot {{z}_{rm}} \\ & {{T}_{b}}=-{{T}_{a}} \\ \end{aligned}\)
Where, the inputs into the equation are defined in the following table:
X Axis Specified Force |
\({{T}_{x}}\) |
Enter the specified torque to the x-axis with respect to the reference marker. |
Y Axis Specified Force |
\({{T}_{y}}\) |
Enter the specified torque to the y-axis with respect to the reference marker. |
Z Axis Specified Force |
\({{T}_{z}}\) |
Enter the specified torque to the z-axis with respect to the reference marker. |
X Axis Reference Marker |
\({{x}_{rm}}\) |
The x-axis direction of reference marker |
Y Axis Reference Marker |
\({{y}_{rm}}\) |
The y-axis direction of reference marker |
Z Axis Reference Marker |
\({{z}_{rm}}\) |
The z-axis direction of reference marker |
Type: Choose the type of expression as Standard Rotational Force or User Subroutine Rotational Force.
Standard Rotational Force: Defines by using the function expression.
User Subroutine Rotational Force: Defines by using the user subroutine. For more information, click Rotational Force USUB.
Expression: Creates an expression of a force. If the user defines the expression, the substance of expression is shown in the text box.
Reference Marker: The force and torque are specified in the coordinate system of reference marker.
Force Display: Displays the resultant force vector graphically on Working Window.