علیرضا یوسفی - دانشگاه فردوسی مشهد
ناصر قاسمیان - دانشگاه بناب

In this work, a hybrid GMDH–neural network model was developed in order to predict the moisture content of papaya slices during hot air drying in a cabinet dryer. For this purpose, parameters including drying time, slices thickness and drying temperature were considered as the inputs and the amount of moisture ratio (MR) was estimated as the output. Exactly ۵۰% of the data points were used for training and ۵۰% for testing. In addition, four different mathematical models were fitted to the experimental data and compared with the GMDH model. The determination coefficient (R۲) and root mean square error (RMSE) computed for the GMDH model were ۰.۹۹۶۰ and ۰.۰۲۲۰,and for the best mathematical model (Newton model) were ۰.۹۹۵۴ and ۰.۰۲۳۰, respectively. Thus, it was deduced that the estimation of moisture content of thin layer papaya fruit slices could be better modeled by a GMDH model than by the mathematical models.

خشک کردن, GMDH, خربزه درختی, شبکه عصبی