6.3.2.3. Translation

A translational force generates three orthogonal translational forces about the reference marker. This force applies action forces to the action body, and the corresponding reaction forces 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 convenient to work with the three translational force components or when the direction of force is different than the direction of the straight line between the attachment point on the action body and the attachment point on the base body.

6.3.2.3.1. 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 translational force.

    • Body: Selects an action body of translational 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.

6.3.2.3.2. Properties

../_images/image386.png

Figure 6.256 Translational property page

The magnitude of the translational force is calculated according to the following equations:

\(\begin{aligned} & {{F}_{a}}={{F}_{x}}\cdot {{x}_{rm}}+{{F}_{y}}\cdot {{y}_{rm}}+{{F}_{z}}\cdot {{z}_{rm}} \\ & {{F}_{b}}=-F{}_{a} \\ \end{aligned}\)

Where, the inputs into the equation are defined in the following table:

X Axis Specified Force

\({{F}_{x}}\)

Enter the specified force to the x-axis with respect to the reference marker.

Y Axis Specified Force

\({{F}_{y}}\)

Enter the specified force to the y-axis with respect to the reference marker.

Z Axis Specified Force

\({{F}_{z}}\)

Enter the specified force 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: Select a type of expression as Standard Translational Force or User Subroutine Translational Force.

    • Standard Translational Force: Defines by using the function expression.

    • User Subroutine Translational Force: Defines by using the user subroutine. For more information, click Translational Force USUB.

  • Expression: Creating 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.