PS Add
R2026bAdd two physical signal inputs
PS Add 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 /
Physical Signals /
Functions
Description
The PS Add block outputs the sum of two input physical signals:
where
| I1 | Physical signal at the first input port |
| I2 | Physical signal at the second input port |
| O | Physical signal at the output port |
Physical signals at the two input ports must have commensurate units. The unit at the output port is determined by unit propagation rules. For more information, see Physical Signal Unit Propagation.
Examples
Nonlinear Inductor
An implementation of a nonlinear inductor where inductance depends on current. A tanh function defines the nonlinear flux-current relationship. The flux saturates for large currents, which can occur, for example, in iron core inductors.
Two-Phase Fluid Refrigeration
Models a vapor-compression refrigeration cycle using two-phase fluid components. The compressor drives the R-134a refrigerant through a condenser, an expansion valve, and an evaporator. The hot gas leaving the compressor condenses in the condenser via heat transfer to the environment. The pressure drops as the refrigerant passes through the expansion valve. The drop in pressure lowers the saturation temperature of the refrigerant. This enables it to boil in the evaporator as it absorbs heat from the refrigerator compartment. The refrigerant then returns to the compressor to repeat the cycle. The controller turns the compressor on and off to maintain the refrigerator compartment temperature within a band around the desired temperature.
Ports
Input
Output
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/Physical Signals/Functions/PS Add"
Example: add_block("fl_lib/Physical Signals/Functions/PS Add","myModel/myBlock",MakeNameUnique="on")
For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.
