It will be better if you can provide the model, if not you can try the following steps.
Linearization can be challenging with physical signal blocks due to their inherent non-linear behaviour. Try to temporarily replace complex physical blocks with simplified versions or linear approximations. For example, use a transfer function or gain block that approximates the LED-photodiode relationship over a small range.
If you're running into errors when trying to linearize the model, then check following things:
- Make sure your simulation runs long enough for the system to reach a steady state before you attempt to linearize it.
- Verify that all your blocks are set up correctly and that there aren't any algebraic loops or solver issues causing problems.
Algebraic loops can be detected by Simulink diagnostic tools Go to Model Settings > Diagnostics > Algebraic loop and set it to "error" or "warning" to get notified during simulation. Also check your solver settings in Model Settings > Solver. Ensure that the solver type and step size are appropriate for your model. Sometimes, switching between fixed-step and variable-step solvers can help.
For more details, look into the following Linearisation Documentation:
