How to remove fluctuations caused by transfer function?

As most of the sensor have some or other kind of time delay, in my model I have used a temperature sensor the signal provided by the sensor is going through a transfer function just to replicate its true nature (i.e thermal inertia). As the sensor data is being used in a feed back loop. The senor with a transfer function is causing eratic behaviour of my whole model. Because when the setpoint is high enough the sensor reading are all over the place. What should I do?

[Image Analyst]

Is the temperature sensor a real device? Or some simulation of one? If it's a real device, I'd contact the manufacturer for their recommendations.

Answer 1

[Aishwarya]

Hi Kartik,

From what I gather, you are using the "Ideal Temperature Sensor" block and its value pases through transfer function to model it as practical sensor. As you have mentioned that transfer function is used in feedback loop, the erratic behaviour of the sensor values could be because of an unstable model.

I would suggest to perform stability analysis on the Simulink model designed. To compute the transfer function of the Simulink model (linearise the model) you can use Linear Analysis Tool in Simulink Control Design. You can refer to the following page for more information and examples: https://www.mathworks.com/discovery/linearization.html