Rotational Free End
Rotational port terminator with zero torque
Simscape / Foundation Library / Mechanical / Rotational Elements
The Rotational Free End block represents a mechanical rotational port that rotates freely, without torque.
You can use this block to terminate mechanical rotational ports on other blocks that you want to leave unconnected. This is not necessary because if you leave a conserving port unconnected, the physical network sets all the Through variables at that port to 0. However, terminator blocks improve diagram readability.
You can also use this block to set the initial rotational velocity at a node.
To set the priority and initial target values for the block variables prior to simulation, use the Variables tab in the block dialog box (or the Variables section in the block Property Inspector). For more information, see Set Priority and Initial Target for Block Variables.
W — Zero torque
Mechanical rotational conserving port that rotates freely, without torque.
Capping unconnected ports is no longer required
Behavior changed in R2019b
This block is no longer required. Starting in R2019b, the restriction that disallowed unconnected conserving ports in Simscape™ models has been lifted. Now, if you leave a conserving port unconnected, the physical network sets all the Through variables at this port to 0. However, you can still use terminator blocks to improve diagram readability.
There are no plans to remove the terminator blocks. All existing models that use these blocks work the same as in previous releases.