JMW_Paper_Tofighi

These programs are related to testing a 2.4 GHz\/10 W, custom-made and standalone, microwave heating (MWH) device built and tested by our group. A nonlinear autoregressive exogenous (NL-ARX) modelling approach is introduced to accurately predict the MWH closed-loop response. Through the first Matlab program, the NL-ARX model is fitted to open-loop measurements at five different power levels (20, 40, 60, 80, and 100% of the full power) performed on a phantom. The phantom baseline temperature is around the body temperature. Those power levels are achieved using pulse-width-modulation (PWM) of the MWH power. The input data to the program are the five temperature differences from the baseline temperature for each case versus time. They are stored in \Data.xlsx\, consisting of six columns: the first being the time and the rest being the five sets of the measured temperature data. The NL-ARX models\u2019 goodness of fit is also obtained. The model is stored in \mw_new_model.mat\ file. The obtained model is then used as part of a closed-loop simulation with proportional-integral-differential (PID) feedback control. The Matlab program to do this reads the saved model from the previous program. Controller parameters are initially specified, and a PID controller is implemented based on the selected setpoints and PID gain\u200b values. The way the program is written, it handles a set of Kp values for a fixed Ki or vice versa. After each simulation for one set of PID values is completed, the corresponding result is exported to an Excel file for further analysis.