Initial Relative Angle (AB)
R2026bInitial Relative Angle (AB) block
To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.
Libraries:
Simscape /
Foundation Library /
Rotational /
Elements
Description
The Initial Relative Angle (AB) block provides an initial angle between ports B and F.
B and F are angle-based rotational conserving ports. For positive relative angle, port F has a more positive angle than port B. The block does not transmit torque.
The block has no parameters. You specify relative angle as an initial variable target.
Variables
To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.
Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.
Examples
Interpreting Angle in the Angle-Based Rotational Domain
Set up and interpret angles in angle-based rotational models. It provides background information to explain the underlying concepts. The angle-based rotational domain tracks angle, θ, and rotational velocity, ω, at every node. Use angle-based rotational blocks to model rotational systems where knowing multiple component angles is important.
Interpreting Torque in the Angle-Based Rotational Domain
Describes how to interpret torques in a Simscape™ angle-based rotational network. It outlines the key concepts for understanding the signs of logged torques. It examines rotational spring systems driven by torque sources at different ends, as well as a rotational system of inertias, to illustrate the torque behavior.
Ports
Conserving
Programmatic Use: Add Block
To add the block programmatically, use the add_block function with one of these library block paths as the source.
"fl_lib/Rotational/Elements/Initial Relative Angle (AB)"
Example: add_block("fl_lib/Rotational/Elements/Initial Relative Angle (AB)","myModel/myBlock",MakeNameUnique="on")
For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.
Extended Capabilities
Version History
Introduced in R2026a
