Location: Analysis page – Safety module
Use the MBS joints panel to define kinematic joints between two local coordinate systems to connect two multibody collectors. The HyperMesh entity created is an mbjoint.
Notes:
| • | The panel contains an organize systems option. When activated (default) during joint creation, two coordinate system collectors will be automatically created and the joint local coordinate systems will be placed in their respective collectors. Since joint local coordinate systems are usually coincident in global space (but not required), the "organize systems" option provides easy access to each joint system. |
| • | Care should be taken when creating joints without coincident joint coordinate because the exported model might not reflect the model in HyperMesh. |
| • | Joint types are defined by assigning a card image in the card image= field (in some user profiles, it is the type= field). If no card image is assigned, all DOFs are active. |
| • | The available joint types are dependent on the template file loaded with the user profile. |
| • | When an mbjoint entity is created, a coordinate system hierarchy is created by: 1) Referencing the child multibody collector’s coordinate system to the joint child coordinate system. 2) Referencing the joint child coordinate system to the joint parent coordinate system. 3) Referencing the joint parent coordinate system to the parent multibody collector’s coordinate system. |
| • | When an mbjoint entity is deleted in the Delete panel, the joint’s child coordinate system is referenced to the global coordinate system. |
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Subpanels and Inputs
The MBS Joints panel contains the following subpanels and command buttons:
Use the Create subpanel to create new MBS joints.
Panel Inputs
Input
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Action
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name =
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Type in a name for the new joint.
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card image = /
type =
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Click the button to display a list of card images, then select one.
| Note: | In some user profiles this button is replaced by type =. |
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parent: color
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Click this button to open a standard color palette, then pick a color for the parent entity of the joint.
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parent: syst
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Use this selector to pick the joint parent's coordinate system.
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parent: multibody / reference space
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Set this toggle to reference space if connecting the joint to the reference space, or multibody if connecting the joint to two bodies.
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mbjoint: color
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Click this button to open a standard color palette, then pick a color for the joint.
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child: color
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Click this button to open a standard color palette, then pick a color for the child entity of the joint.
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child: syst
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Use this selector to pick the joint child's coordinate system.
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child: multibody
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Use this selector to choose the multibody collector that defines the joint’s child body.
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organize systs
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When activated, the joint coordinate systems are automatically separated into new coordinate system collectors.
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Use the Update subpanel to change the characteristics of an existing MBS joint.
Panel Inputs
Input
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Action
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name =
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Click this input to select the desired MBS joint from a list of existing ones.
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card image = /
type =
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Click the button to display a list of card images, then select one.
| Note: | In some user profiles this button is replaced by type =. |
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parent: syst
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Use this selector to pick the joint parent's coordinate system.
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parent: multibody / reference space
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Set this toggle to reference space if connecting the joint to the reference space, or multibody if connecting the joint to two bodies.
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mbjoint: color
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Click this button to open a standard color palette, then pick a color for the joint.
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child: syst
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Use this selector to pick the joint child's coordinate system.
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child: multibody
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Use this selector to choose the multibody collector that defines the joint’s child body.
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Use the Card Image subpanel to change the card image (or type, in some user profiles) assigned to an existing MBS joint.
Panel Inputs
Input
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Action
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name =
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Click this input to select the desired MBS joint from a list of existing ones.
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card image = /
type =
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Click the button to display a list of card images, then select one.
| Note: | In some user profiles this button is replaced by type =. |
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The following action buttons appear throughout the subpanels:
Button
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Action
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create
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Creates the new MBS joint.
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create/edit
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Creates the new joint and opens its assigned card image in edit mode.
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update
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Changes the selected joints to use the current input settings.
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edit
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Edits the current MBS joint's card image.
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load
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Loads the selected MBS Joint's card image.
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load/edit
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Loads the selected MBS Joint's card image and displays it in edit mode.
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reject
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Undoes the most recent joint creation or update.
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reset
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Resets the joint's input settings to their original values.
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reset all
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Resets all MBS joints in the model their original values.
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return
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Exits the panel.
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See Also:
An Alphabetical List of HyperMesh Panels
