Fiona 1602

Thāne, India

Fiona 1602

Thāne, India

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Bera M.K.,Indian Institute of Technology Bombay | Bandyopadhyay B.,Indian Institute of Technology Bombay | Paul A.K.,Fiona 1602
International Journal of Modelling, Identification and Control | Year: 2014

This paper explores the design of a non-linear output-feedback control technique based on the higher order sliding mode approach for an uncertain manual gas metal arc welding (GMAW) system. To cope with the large uncertainties affecting the dynamics of the system and the rapid changes in contact tip to workpiece distance (CT) caused by the uneven movement of the welding gun by the operator, an output-feedback control system has been developed with an observer-controller that combines the second order sliding mode (SOSM) controllers and an SOSM differentiator. A non-linear single input single output (SISO) system model has been considered here for the design. Thus, the robust output feedback controller with observer is proposed here, which has been compared with an earlier proposed classical feedback linearisation approach. Simulation results are presented and discussed in order to establish a framework for comparison. Copyright © 2014 Inderscience Enterprises Ltd.


Paul A.K.,Fiona 1602
2010 Joint International Conference on Power Electronics, Drives and Energy Systems, PEDES 2010 and 2010 Power India | Year: 2010

Stability, performance and reliability together they define features of a product. Optimization is possible when right topology is used. Series resonant and parallel resonant topologies are traditionally being used for control of induction heating plant. It is necessary to zero down on topology for optimal performance in induction heating for wide range (power and frequency) applications. This paper discusses on basic guidelines for selection of topology that generate better confidence level suitable for a particular application boundary. © 2010 IEEE.


Paul A.K.,Fiona 1602
PEDES 2012 - IEEE International Conference on Power Electronics, Drives and Energy Systems | Year: 2012

Stability and performance with robustness features are key control pre-requisites. Rapid evolution in power electronics has made the area of power control a very dynamic subject. Evolving role of power controllers is to ensure optimum energy usage for connected loads and simultaneously taking care of a whole lot of issues such as reliability, EMI, power density, cost etc. In such trend, evolving topologies for high frequency inverters take center stage where many fast structures in the power circuit are time-integrated to incorporate soft-switching. They are not compatible to abrupt structure switching. Sliding mode control (SMC), on the other hand, generates robustness features through structure switching in a proper way. This article analyses, with practical implementations, compatibility of structure switching for SMC in modern high frequency full bridge inverters. © 2012 IEEE.


Paul A.K.,Fiona 1602
2014 IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2014 | Year: 2014

GMAW is a complete arc welding process. It is equipped to create all types of joints of desirable quality involving virtually all metals of any thickness in any position. However, in doing so there are parametric shifts in arc gap or load characteristics. Change in materials such as shielding gas, weld metal and work piece etc. influence the operating point of the process. Moreover, the controller needs to ensure smooth starting, normal operation and also its stopping where multiple dynamic activities such as melting rate, droplet transfer, re-ignition post short circuit and spatter rate are optimized. It is ideal for end users if one controller or equipment can have grip of control over activities of entire process. This article explores practicability criteria of popular PI and SMC control ideas to inclusively achieve control over complete process requirement of GMAW to cater its application prospects. © 2014 IEEE.


Paul A.K.,Fiona 1602
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2014

Welders in large numbers are engaged in manual shielded metal arc welding (SMAW) process to make mechanical joints in metals. Inputs to the process have multiple origin and specified joint characteristics are wide. Welder and controller are two active elements involved in the process. Modern welding controllers have greatly simplified the role of welders in making good quality joints. However, in that process of technological evolution, essential aspects such as health hazards and welder friendliness have not been paid due attention. Process efficiency is also poor. The present article details, with detailed practical implementations, the extended role of power electronics controller with the help of selective use of sliding mode control (SMC) ideas for achieving conflict free multi-objective optimization program of the process. Traditional structure switching has been completely avoided for implementation of SMC. © 2014 IFAC.


Paul A.K.,Fiona 1602
International Journal of Power Electronics | Year: 2013

Sliding mode control (SMC) idea has steadily remained a busy research area for more than half a century. Its market penetration in industrial products is, however, below expected line. A control idea, for its mass market penetration needs to meet, apart from control objective, multi-objective criteria ranging from its simple implementation procedure, meeting energy efficiency, cost, weight, etc. Control is inherently required in power electronics domain for control and actuation purposes to translate a particular control idea to achieve desired goal effectively. To achieve such goal, evolution in SMC has remained mostly one-dimensional - to eliminate chattering. In that process it increasingly generates complex control algorithm for power electronics to handle; whereas evolution in power electronics is searching for overall product optimisation. This article practically analyses the maturity model of SMC for its acceptability in power electronics domain. © 2013 Inderscience Enterprises Ltd.


Paul A.K.,Fiona 1602
International Journal of Power Electronics | Year: 2012

Unlike most control systems, a single arc welding controller performs different welding functions using dynamics of different arc characteristics meeting complex output characteristics - that includes apart from joint characteristics are arc light intensity, fumes and particulate matters, etc. Moreover, unavailability of feedback in major loop for control of heat input to joint divides the parameters of the complete process into external and intrinsic ones. Intrinsic parameters define arc characteristics. Dynamic non-linear intrinsic parameters cannot be made insensitive even through sliding mode control. Representative dynamical systems for starting, stopping and normal welding are also different. This article explores the scope of practical implementation of SMC to complete range of arc welding process. In constant current (CC) manual arc welding process, arc is extinguished by increasing the arc length much beyond the controller can sustain. In that process, it produces large unusable heat causing discomfort to the welder and co-workers. The present article, as well, discusses implementation mechanism of SMC to optimise arc light intensity and reduce heat generation in arc column in order to convert mechanism of manual arc extinction of SMAW welder friendly. Chattering issue is not important. Copyright © 2012 Inderscience Enterprises Ltd.


Logistics, welder's comfort, productivity and quality need of weld joint and jobs in hand at site etc., together decide the required arc (constant current (CC) or constant voltage (CV) or their combination) characteristics. Multi-functional arc welding equipment meets such needs. High across the load efficiency, fast settling time of output variables and light and compactness are major pre-requisites of arc welding equipment. Some of them are achieved if switching frequency of inverter is kept high. Constraint of efficiency at high switching frequency is, generally, overcome by adopting proper soft switching topology. This paper suggests that better design is possible for narrow power range arc welding equipment (3-20 kW) using traditional hard-switched inverter with just optimisation in input materials. Reduced component count and reduced interconnections between sub-assemblies in hard-switched full-bridge inverter generate superior design for manufacturability issues. Copyright © 2012 Inderscience Enterprises Ltd.


Paul A.K.,Fiona 1602
International Journal of Power Electronics | Year: 2014

Power electronics equipment is deployed for control of power flow in electrical domain. Steady and fast growth in controller, active and passive power and control components, power control topologies etc. and the impact on overall gains it makes to society have led the evolution process of power electronics field to mature fast. Apparently, contemporary SMC concepts with their simple implementation procedures using structure switching mechanism along with their ability to reject disturbances and also generate parametric insensitivity remain very attractive research area for several decades. However, compared to PI control, their market penetration in power electronics domain is below expected line. Inertia to market penetration of SMC idea is large. For practical implementation, PI control remains as industry standard. This paper, using experimental design approach, tries to figure out basic differences between PI control and SMC concepts in shaping up a completely engineered product in power electronics domain. Copyright © 2014 Inderscience Enterprises Ltd.


Bera M.K.,Indian Institute of Technology Bombay | Bandyopadhyay B.,Indian Institute of Technology Bombay | Paul A.K.,Fiona 1602
Proceedings of the IEEE International Conference on Industrial Technology | Year: 2013

This paper presents the control of a gas metal arc welding (GMAW) system using one of the higher order sliding mode control algorithms, the super twisting controller, which is a continuous control and a superior control with its extreme robustness property. A nonlinear multi input multi output (MIMO) system model has been considered here for the design of the super-twisting controllers. The control inputs chosen are, the open circuit voltage and the wire feed speed which are used to control the current and arc length of the system. The performance analysis of the controllers are studied in the presence of wide variations of model parameter uncertainties. The simulation results are presented to illustrate the efficiency of the controller used. © 2013 IEEE.

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