Technical Brief

Variable Gain Super-Twisting Control of GMAW Process for Pipeline Welding

[+] Author and Article Information
Manas Kr. Bera

Systems and Control Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, India
e-mail: manas.bera@sc.iitb.ac.in

Bijnan Bandyopadhyay

Systems and Control Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, India
e-mail: bijnan@ee.iitb.ac.in

A. K. Paul

Fiona 1602, Hiranandani Estate,
Thane 400607, India
e-mail: arunp_26@vsnl.net

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received March 27, 2014; final manuscript received December 15, 2014; published online February 9, 2015. Assoc. Editor: Yongchun Fang.

J. Dyn. Sys., Meas., Control 137(7), 074501 (Jul 01, 2015) (7 pages) Paper No: DS-14-1141; doi: 10.1115/1.4029408 History: Received March 27, 2014; Revised December 15, 2014; Online February 09, 2015

Quality control is the key issue that needs to be addressed in any gas metal arc welding (GMAW) system, especially in robotic pipeline welding system. This paper explores a second-order sliding mode control (SMC) strategy—a variable gain super-twisting control, to maximize the productivity, consistency in welding quality. This is achieved by the robust finite time output tracking of GMAW system. A nonlinear multi-input multi-output (MIMO) model of GMAW system has been considered here for the design of variable gain super-twisting (VGST) controller by which complete rejection of the bounded uncertainties/disturbances is possible and the adaptive characteristic of its gains help to use the control effort effectively. The stability of internal dynamics of the system is studied to establish the feasibility of solving the robust finite time output tracking problem. The stability of the overall system has been analyzed using Lyapunov stability criterion. The performance of the controller is demonstrated using the model of the system emulating the realistic conditions of operation. The simulation results are presented to illustrate the efficacy of the controller.

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