MATLAB: Solving differential equation in simulink

differetial equationsimulink

Hello Everyone

I am solving a differential equation (attached) of greenhouse energy balance on SIMULINK which has basically two unknowns (Tin and qg). One of them (qg) is model output and other (Tin) is also not know from any means. Now I have to calculate both of these parameters from this differential equation. The only thing that I know is the 6 factors on rightside of the equation but all of them are dependent on Tin and there is a operating set point for temperature is given as 20 for day and 16 for night for greenhouse. Can someone help me to solve this equation?

My simulink model is also attached.Plzzzz guide me

Best Answer

hello again. this should look like this:

by clicking on "Tune" an app opens and tries to first linearize the system and then choose the best coefficients.

Related Solutions

MATLAB: How to determine if the control signal I got in tuning the PI controllers for the SS model is valid

Well, I have checked your model. You defined your control signal as Joule, and it almost rises from zero to its peak value in no time. This is not realistic since you arranged your Kp coefficient higher than 700. In simulation, it may give you a fine result, but in reality, since the control signal applied on the system is mostly voltage, you can not increase your Kp coefficient this much. Therefore, to make your control process more realistic, I suggest you to either put a saturation element in front of your control signal or redesign your controller. Note that mostly the energy given to the system is generated by an electrical source, which means you have to control the voltage level coming out of your driver circuit.

MATLAB: How to set Values to Simulink Block from the Workspace

To get the list of parameters associated with 'PID Controller' block, I would use the below command :

allParams = get_param('Simulink_Model/PID Controller', 'DialogParameters');

If you are looking to find any particular parameter value, let's say the Proportional Gain :

P_Gain_Val = get_param('Simulink_Model/PID Controller', 'P');

For setting values , (P = 10, I = 2, D = 0.1)

set_param('Simulink_Model/PID Controller', 'P', '10', 'I', '2', 'D', '0.1'); % No output argument

Best Answer

Related Solutions

MATLAB: How to determine if the control signal I got in tuning the PI controllers for the SS model is valid

MATLAB: How to set Values to Simulink Block from the Workspace

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