AUTHORS: Mustafa Saad, Almukhtar Ramadhan

Download as PDF

ABSTRACT: Sliding mode control is a powerful approach for controlling nonlinear and uncertain systems. This paper presents the liquid level control of the nonlinear-coupled tank system using sliding mode control technique. At first, a static sliding mode control technique is proposed to control level height of the second tank. According to the chattering problem that happened with static sliding mode control, integral sliding mode controller is suggested to reduce the chattering problem, as well as guarantee the asymptotic stability of the feedback system. The closed loop system is simulated using MATLAB Simulink to demonstrate the characteristic performance of the developed control approaches. Therefore, the simulation results indicate that the proposed control schemes work very well. While, the integral sliding mode control has a better performance for the rejection of disturbance, as well as the system’s parameters variation.

KEYWORDS: Static sliding mode control, Integral sliding mode control, Coupled tank system, Level control, Nonlinear system, Modeling

REFERENCES:

[1] Soumya Ranjan Mahapatro, Control Algorithms for a Two Tank Liquid Level System: An Experimental Study, M. Sc. Thesis, National Institute of Technology, Rourkela, India 2012.

[2] Application Examples of KRi Coupled-Tank Control Apparatus PP-100. Application Note: CT-101, Kent Ridge Instruments Pte Ltd, November 1, 1995.

[3] N. B. Almutairi, and M. Zribi, Sliding mode control of coupled tanks, Elsiver, Vol. 16, Issue 7, September 2006, pp. 427-441.

[4] Mustafa Saad, Performance analysis of a nonlinear coupled-tank system using PI controller, UJCA, Vol. 5, No. 4, Decmber 2017, pp. 55-62.

[5] Mohd Tabrej Alam, Piyush Charan, Qamar Alam, Shubhi Purwar, Sliding Mode Control of Coupled Tanks System: Theory and an Application, IJETAE, Vol. 3, No. 8, August 2013, pp.650-656.