Reference (rotational)#

Reference (rotational) block models a rigid connection to a fixed zero reference node that enforces zero angular velocity of any connected rotational components.

The angular velocity at the reference point is always zero (1) :

(1)#\[\omega (t)=0\]

where \(\omega (t)\) – is angular velocity in [rad/s].

All rotational ports rigidly tied to the reference frame should be connected to this block.

Important

Do not additionally connect Rotary moment of inertia and Rotary moment of inertia with friction (or any other element already rigidly referenced to the frame) to zero reference — otherwise its angular velocity will be forced to zero.

1. Properties#

Property	Default Value	Description	Units of measurement
Number of input ports	1	Sets the number of input ports for a block.	-
Number of output ports	1	Sets the number of output ports for a block.	-

2. Inputs and outputs#

Parameters	Input/Output	Description	Units of measurement	Port type
Input	Input	The number of input ports is specified in the `Number of input ports` property	-	Rotational motion
Output	Output	The number of output ports is specified in the `Number of output ports` property	-	Rotational motion

In order to see the connection capabilities of the block, you need to go to page Description of block ports