WOLFRAM SYSTEMMODELER

LineForceWithMass

General line force component with an optional point mass on the connection line

Wolfram Language

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Click for copyable input
SystemModel["Modelica.Mechanics.MultiBody.Forces.LineForceWithMass"]
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Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This component is used to exert a line force between the origin of frame_a and the origin of frame_b by attaching components of the 1-dimensional translational mechanical library of Modelica (Modelica.Mechanics.Translational) between the two flange connectors flange_a and flange_b. Optionally, there is a point mass on the line connecting the origin of frame_a and the origin of frame_b. This point mass approximates the mass of the force element. The distance of the point mass from frame_a as a fraction of the distance between frame_a and frame_b is defined via parameter lengthFraction (default is 0.5, i.e., the point mass is in the middle of the line).

In the translational library there is the implicit assumption that forces of components that have only one flange connector act with opposite sign on the bearings of the component. This assumption is also used in the LineForceWithMass component: If a connection is present to only one of the flange connectors, then the force in this flange connector acts implicitly with opposite sign also in the other flange connector.

Connectors (4)

frame_a

Type: Frame_a

Description: Coordinate system fixed to the component with one cut-force and cut-torque

frame_b

Type: Frame_b

Description: Coordinate system fixed to the component with one cut-force and cut-torque

flange_b

Type: Flange_a

Description: 1-dim. translational flange (connect force of Translational library between flange_a and flange_b)

flange_a

Type: Flange_b

Description: 1-dim. translational flange (connect force of Translational library between flange_a and flange_b)

Parameters (9)

animateLine

Value: true

Type: Boolean

Description: = true, if a line shape between frame_a and frame_b shall be visualized

animateMass

Value: true

Type: Boolean

Description: = true, if point mass shall be visualized as sphere provided m > 0

m

Value: 0

Type: Mass (kg)

Description: Mass of point mass on the connection line between the origin of frame_a and the origin of frame_b

lengthFraction

Value: 0.5

Type: Real ()

Description: Location of point mass with respect to frame_a as a fraction of the distance from frame_a to frame_b

lineShapeType

Value: "cylinder"

Type: ShapeType

Description: Type of shape visualizing the line from frame_a to frame_b

lineShapeExtra

Value: 0.0

Type: ShapeExtra

Description: Extra parameter for shape

s_small

Value: 1.E-10

Type: Position (m)

Description: Prevent zero-division if distance between frame_a and frame_b is zero

fixedRotationAtFrame_a

Value: false

Type: Boolean

Description: =true, if rotation frame_a.R is fixed (to directly connect line forces)

fixedRotationAtFrame_b

Value: false

Type: Boolean

Description: =true, if rotation frame_b.R is fixed (to directly connect line forces)

Components (3)

world

Type: World

Description:

lineShape

Type: Shape

Description:

massShape

Type: Shape

Description:

Used in Components (1)

Spring

Linear translational spring with optional mass