The two attachments belonging to a joint can be Attachment features, Rigid Material features, or a combination of the two. The source attachment can also be set to be either fixed or to have a given Base motion. In the case of a fixed attachment, it cannot translate or rotate. This avoids the modeling of extra fixed rigid domains when a structure is “grounded”. The base motion is a generalization of the fixed attachment, where the environment to which it is attached can have a prescribed displacement, velocity, or acceleration.
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In the Ball Joint and Slot Joint, the inclination angle is the angle between the reference axis and the destination axis. The axial rotation occurs about the destination axis. This reference axis is defined on the source attachment.
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In the Planar Joint, all axes in its subnodes follow the source attachment.
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Method 1: Give the components explicitly in a selected coordinate system.
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Method 2: Select one of the axes of a selected coordinate system.
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Method 3: Select an edge that is parallel to the joint axis.
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Evaluating reaction force for the prescribed motion by selecting Evaluate reaction forces in the Reaction force settings section of the settings for Prescribed Motion has several benefits over evaluating it using joint forces and moments computed using weak constraints:
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To automatically create Identity Boundary Pair nodes between geometrically disconnected objects, set the geometry sequence finalization step to Form Assembly from the default Form Union. If you want to automatically generate a joint node between any boundaries which are not part of the existing identity boundary pairs, create a new Identity Boundary Pair node with desired boundaries selected.
If the selection of Source Boundaries and Destination Boundaries contain mixed shape boundaries, it is not possible to automatically create any types of joints between them.
The Create Joints functionality only works for models with a geometry sequence. For models containing only a mesh, this functionality does not automatically create joints.
If you do not want to create joints between boundaries of a few specified Identity Boundary Pair nodes, temporarily disable them before clicking the Create Joints button. This will omit these boundaries from automatic joint creation.
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The selection of the two Attachment nodes is same as the selection of the Source Boundaries and Destination Boundaries respectively.
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If there is an existing Attachment node on any of these boundaries, no new Attachment node is created. Instead, the selection of the existing Attachment is modified to include the selection of the Source Boundaries or Destination Boundaries.
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If the selection of Source Boundaries or Destination Boundaries is part of any Rigid Material node selection, then no new Attachment node is created on these boundaries. Instead, the corresponding Rigid Material is set as the Source or Destination of the Joint node.
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