Abstract
In this work, we thoroughly investigate the use of sliding mode control for nonlinear systems, specially its application for the control of dryer designed for drying food products. A dynamic model of the drying process has been developed, experimental measurements presented in this paper are established for different values of drying air temperature and drying air velocity. Two scenario of sliding mode control applied to the hybrid tunnel dryer has been assessed through simulations. At first, a nonlinear sliding mode control with first order sliding surface was tested. In front of the insufficient performance of this control in terms of the presence of chattering phenomenon and static error, it was decided to apply a nonlinear sliding mode control with PI sliding surface. Simulation results show that this latter control approach can obtain excellent control performance with no chattering problem, reducing of static error and a good tracking of trajectory.
Highlights
The practice of drying is one of the oldest techniques used in various fields of industry, while many studies have dealt to the exploration of different designs and types of dryers
The researchers thoroughly investigate the use of sliding mode control for nonlinear systems, especially its application for the control of dryer designed for drying food products
We study the application of the sliding mode control to the dryer; this method is designed for a class of nonlinear dynamic systems to tackle the problems with model uncertainties, parameter fluctuations and external disturbances (Jalel, Ahmed & Sundarapandian, 2018, Sana, B & Anis, 2018)
Summary
The practice of drying is one of the oldest techniques used in various fields of industry, while many studies have dealt to the exploration of different designs and types of dryers. The drying of agro-food products is done in sophisticated dryers, ensuring a rational implementation of the operation (Amer, Hossain & Gottschalk, 2010), from the most used industrial dryers are convective tunnel dryers Most of these dryers operate in forced convective mode where the main thermal energy generator can be conventional (gas or fuel burner), solar or combined. This system has been designed to dry slices of wet agricultural products placed in trays and oriented to a hot air flow. Tk is air absolute temperature (K) and aw is the water activity
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