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Represent an assembled revolute joint with one rotational degree of freedom
Library
Description
The Revolute block represents a single rotational degree of freedom (DoF) about a specified axis between two bodies. The rotational sense is defined by the right-hand rule. A revolute joint is one of SimMechanics primitive joints, along with prismatic and spherical.
The Revolute block is assembled: you must connect each side of the Joint block to a Body block at a Body coordinate system (CS) point, and the origins of these Body CSs must be spatially collocated points, to within assembly tolerances.
You can connect any Joint block to two and only two Body blocks, and Joints have a default of two Connector Ports for connecting to base and follower Bodies.
A Joint block represents only the abstract relative motion of two bodies, not the bodies themselves. You must specify a reference CS to define the direction of the joint axis.
Revolute motion of follower (blue) relative to base (red)
Dialog Box and Parameters
The dialog box has two active areas, Connection parameters and Parameters.
Connection Parameters
0
.The base (B)-follower (F) Body sequence determines the sense of positive motion. Positive rotation is the follower rotating in the right-handed sense about the rotation axis.
Revolute base and follower Body Connector Ports
Parameters
Toggle between the Axes and Advanced panels with the tabs.
The entries on the Axes pane are required. They specify the direction of the rotation axis of the DoF that the Revolute represents.
R1
.Revolute
.[0 0 1]
. The axis is a directed vector whose overall sign matters.WORLD
.The Advanced pane is optional. You use it to control the way SimMechanics interprets the topology of your schematic diagram.
See Also
Disassembled Revolute, Joint Actuator, Joint Initial Condition Actuator, Joint Sensor, Joint Stiction Actuator, Prismatic, Spherical
See Modeling Joints for more on representing DoFs with Joints.
See Checking Schematic Topology and How SimMechanics Works for more on closed loops and cutting.
![]() | Prismatic | Revolute-Revolute | ![]() |