Model reference adaptive controller for enhancing depth of penetration and bead width during Cold Metal Transfer joining process

Rahul, S G; Dhivyasri, G.; Kavitha, P.; Vendan, S. Arungalai; Kumar, K. Yogesh; Garg, Akhil; Gao, Liang

doi:10.1016/j.rcim.2018.03.013

Cited by 8 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When a short circuit occurred, the current voltage decreased and the arc was extinguished. During this period, the voltage was almost 0 V [23]. In a cycle, the duration of peak period for samples 1, 2, 3, and 4 was∼4 ms, 7 ms, 12 ms, and 25 ms, respectively.…”

Section: Formation Of Overlapmentioning

confidence: 89%

Macrostructure, microstructure and wear performance of Al alloy cladding fabricated by CMT technique

Tian

Shen

et al. 2020

Eng. Res. Express

View full text Add to dashboard Cite

The macrostructure, microstructure and wear performance of Al cladding fabricated by cold metal transfer (CMT) technique were investigated. The overlaps were formed on both sides of Al cladding using CMT technique with direct current mode. The weld depth and contact angle increased, and the overlap length reduced with an increase of heat input, which can be realized by increasing wire feed speed (WFS) or arc length correction (ALC). The grain size and thickness of heat affected zone increased with an increase of heat input, which resulted from increasing WFS or ALC. Due to the increase of average grain size, the hardness value of the clad Al alloy reduced with the increase of ALC. Besides, wear rate increases with an increase of ALC under the scope of load between 80 and 120 N and time between 10 and 20 min. The grooves are clearer at the wear surfaces with an increase of ALC at the wear surface.

show abstract

Section: Formation Of Overlapmentioning

confidence: 89%

Macrostructure, microstructure and wear performance of Al alloy cladding fabricated by CMT technique

Tian

Shen

et al. 2020

Eng. Res. Express

View full text Add to dashboard Cite

show abstract

“…The conventional linear control schemes such as proportional-integral-derivative (PID) controller or state space control schemes face model disturbances and uncertainties leading to instability when applied to non-linear systems. Adaptive controllers result in excellent outcomes for non-linear systems that undergo process disturbances and uncertainties (Rahul et al , 2018). The control schemes for FSW are categorized into force control, position control, or sometimes hybrid of both force and position control, torque control, temperature control at tool-work interface and weld speed control (Gibson et al , 2014).…”

Section: Control System For Friction Stir Weldingmentioning

confidence: 99%

Fundamentals and review on material science, control theory and parametric inter-dependencies during friction stir welding of aluminium metal matrix composites

Rahul

Sharmila

2019

WJE

View full text Add to dashboard Cite

Purpose The purpose of this study is to present a comprehensive review of the fundamental concepts and terminologies pertaining to different types of aluminium metal matrix composites, their joining techniques and challenges, friction stir welding (FSW) process, post-welding characterizations and basic control theory of FSW, followed by the discussions on the research reports in these areas. Design/methodology/approach Joining of aluminium metal matrix composites (Al-MMC) poses many challenges. These materials have their demanding applications in versatile domains, and hence it is essential to understand their weldability and material characteristics. FSW is a feasible choice for joining of Al-MMC over the fusion welding because of the formation of narrow heat affected zone and minimizing the formation of intermetallic compounds at weld interface. The goal in FSW is to generate enough thermal energy by friction between the workpiece and rotating tool. Heat energy is generated by mechanical interaction because of the difference in velocity between the workpiece and rotating tool. In the present work, a detailed survey is done on the above topics and an organised conceptual context is presented. A complete discussion on significance of FSW process parameters, control schemes, parameter optimization and weld quality monitoring are presented, along with the analysis on relation between the interdependent parameters. Findings Results from the study present the research gaps in the FSW studies for joining of the aluminium-based metal matrix composites, and they highlight further scope of studies pertaining to this domain. Originality/value It is observed that the survey done on FSW of Al-MMCs and their control theory give an insight into the fundamental concepts pertaining to this research area to enhance interdisciplinary technology exploration.

show abstract

“…A comparative analysis of MIT tuning rule-based control and Differential Evolution (DE) algorithm-based control was carried out for a MAGLEV system. The analysis revealed that the DE-based offline tuned PID controller performance is better than that of the MIT rule-based online tuned PID controller [11]. While in the usage of adaptive control schemes, in a standard MRAC, to rapidly reduce the tracking error, high-gain control behaviour is exhibited by using larger adaptive gain to achieve fast adaptation.…”

Section: Theoretical Introductionmentioning

confidence: 99%

Enhanced Model Reference Adaptive Control Scheme for Tracking Control of Magnetic Levitation System

et al. 2021

View full text Add to dashboard Cite

Magnetic Levitation is a process in which an object is suspended with the support of the magnetic field. Despite being an unstable system, Magnetic Levitation Systems (MAGLEV) have profound applications in various fields of engineering. MAGLEV systems are sensitive, unstable, and nonlinear and uncertainties always pose a challenge in Controller Design. As a solution, adaptive controllers came into existence with adaptation mechanisms to cover the system uncertainties. In this study, a simple, novel, and an effective approach to the Enhanced Adaptive Control scheme is proposed for the ball position control and tracking of an unstable Magnetic Levitation System. The proposed Enhanced Model Reference Adaptive Scheme (EMRAC) follows the same phenomenon of the Model Reference Adaptive Scheme (MRAC) with a slight difference in its control strategy. The proposed scheme consists of Proportional-Integral-Velocity plus Feed Forward as the control structure and a modified version of the standard tuning rule is used as the adaptation mechanism. The control scheme is applied to a standard benchmark Magnetic Levitation System and the tracking performance of the scheme is tested by applying square and multi-sine pattern trajectories to the Magnetic Levitation System. The performance of the developed Enhanced MRAC performance is compared with that of the Proportional Integral Velocity with Feedforward Control (PIV+FF) scheme and the proposed control scheme is proven to be more suitable. The performance of the proposed scheme is also analyzed with Power Spectral Density and Root Mean Square Error to evaluate the ball position tracking control. It is inferred from the experimental results that Enhanced MRAC accommodates the changes and makes the system more reliable with good tracking ability.

show abstract

Model reference adaptive controller for enhancing depth of penetration and bead width during Cold Metal Transfer joining process

Cited by 8 publications

References 23 publications

Macrostructure, microstructure and wear performance of Al alloy cladding fabricated by CMT technique

Macrostructure, microstructure and wear performance of Al alloy cladding fabricated by CMT technique

Fundamentals and review on material science, control theory and parametric inter-dependencies during friction stir welding of aluminium metal matrix composites

Enhanced Model Reference Adaptive Control Scheme for Tracking Control of Magnetic Levitation System

Contact Info

Product

Resources

About