The two attachments belonging to a joint can be Attachment features, Rigid Domain 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 subfeatures 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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