Fixed Node
The Fixed Node () feature adds a fixed node to the system. This is the default node in the Lumped Mechanical System interface. This node is used in order to fix one or more ports of a component.
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Disable the Fixed Node if none of the nodes of the system is connected to the ground.
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It is also possible to use a single instance of this node to fix the ports of multiple components.
Name
Enter a component Name for the fixed node. The default name (for the first instance) is fix1.
Node Connections
Set the Node name for the fixed node.
Theory for Fixed Node
Location in User Interface
Context Menus
Lumped Mechanical System > Terminals > Fixed Node
Ribbon
Physics tab with  Lumped Mechanical System selected:
Global > Terminals > Fixed Node