Browsing by Author "Anchan, S.S."

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Centralized Proportional Integral Controller Design for the Activated Sludge Process
(John Wiley and Sons Inc, 2022) Anchan, S.S.; Sankar Rao, C.S.
The design of a centralized proportional integral controller for a single-tank activated sludge process is presented. The relative normalized gain array (RNGA) and dynamic relative gain array (dRGA) were adopted for enhancing the closed-loop performance of a multivariable system. The dRGA method gave superior and acceptable responses compared to the RNGA method. The designated error indices decreased significantly for the dRGA method compared with the RNGA method. The dRGA method is simple and effective, since it considers the process dynamics to provide an accurate interaction assessment. The designed centralized controller overcomes the limitations of the decoupler for stability challenges when compared with decentralized controllers. © 2022 Wiley-VCH GmbH.
Feasibility of roof top rainwater harvesting potential - A case study of South Indian University
(Elsevier Ltd, 2021) Anchan, S.S.; Prasad, H.C.
Shortage of water source has been a major problem for rapidly growing cities in country like India due to increase in consumption of water. Besides this the coastal cities like Mangaluru are currently challenged by temporary floods due to increased precipitation. Hence it demands a flawless planning for managing the water resource. Rooftop Rainwater Harvesting (RTRWH) has proven to be the most economical and environmental friendly method. The principal objective of this study is to design the RWH system for a South Indian University (SIU), to transform the present campus with green initiative by effective utilization of water resource. An integrated study on rooftop storm water runoff for quantitative and qualitative analysis was conducted. The SIU can resolve the water scarcity issue by accumulating about 1,13,678.9 m3 of stormwater from rooftop in a year, and use it during the non-monsoon season. These findings can significantly influence the similar RTRWH initiatives in various government and private establishments for sustainable water management. © 2021 The Authors
Improved PID controller design for an unstable second order plus time delay non-minimum phase systems
(Elsevier B.V., 2022) Patil, P.; Anchan, S.S.; Sankar Rao, C.S.
Principally the fundamental limitations for achieving better control performance is caused due to the existence of positive zeros. This study proposes a method to stabilize the unstable non-minimum phase Second Order Plus Time Delay (SOPTD) process. It adopts the Taylor series expansion to produce the equal order of numerator and denominator for the closed loop transfer function. The coefficient of corresponding powers of s, s2 and s3 in numerators are equated to α, β, γ times of the denominator and solved for PID controller setting using multi-objective optimization problems. The stability of the controller is then analysed by minimizing the Integral Time weighted Absolute Error (ITAE) and maximum sensitivity function using MATLAB solvers. The observations from various simulation studies clearly suggests that the proposed method provides significant superior responses when compared with the methods reported. © 2022 The Author(s)
Optimal detuning of multivariable proportional integral controller based on data-driven approach for an activated sludge process
(John Wiley and Sons Ltd, 2023) Anchan, S.S.; Kumar Tanneru, H.; Sankar Rao, C.S.
The study deals with designing a multivariable centralized proportional-integral (PI) controller for an activated sludge process (ASP) by adopting a new tuning technique. To overcome the tedious task of manual tuning by a classical method that was based on Ziegler–Nichols tuning, a novel approach is developed by formulating the optimization problem and considering it along with the theoretical results to calculate the controller parameters. The proposed method is then compared with the reported method to demonstrate the advantages of the proposed approach. A nonlinear ASP model is selected to evaluate the performance of the designed controller. The simulation carried through the proposed optimization technique exhibits a significant improvement in closed-loop performance for tuning the centralized controller. It is observed that the proposed method minimizes the effort of tuning the controller significantly. The proposed controller achieves better load disturbance response and lower overshoot than the reported method. The proposed method could improve integral absolute error (IAE) and integral time absolute error (ITAE) performance indices, ranging between 18.69% to 53.80% and 16.42% to 52.97% for a step change in (Figure presented.) and (Figure presented.), respectively, which are better compared to the reported method. The study also assesses the control system's robustness for their uncertainties with the time constant and time delay. © 2023 Curtin University and John Wiley & Sons Ltd.
Robust decentralized proportional–integral controller design for an activated sludge process
(John Wiley and Sons Ltd, 2020) Anchan, S.S.; Sankar Rao, C.S.
This paper presents the design of a decentralized proportional–integral (PI) controller for a wastewater treatment plant (WWTP). The aeration rate and the return recycle sludge rate are manipulated inputs to the WWTP process, while substrate and biomass concentration are considered as the output variables. The study is divided into two segments: A decentralized controller is designed based on the best pairing in the first segment, and in the second segment, a decoupler is developed to reduce the interactions. Decouplers are generally used to create independent loops in the multivariable control loops. Each decoupled subsystem is converted to first order plus time delay (FOPTD) model using a system identification toolbox to design independent diagonal controllers. The numerical simulations have been performed to evaluate the effectiveness of the presented methods. Furthermore, a robustness study has also been carried out by taking into account multiplicative input and output uncertainties, and it is found that the controller designed based on minimizing the integral of absolute error (IAE) criteria shows more robust. © 2020 Curtin University and John Wiley & Sons, Ltd.
Survey on solid waste generated at a South Indian University Campus
(Inderscience Publishers, 2022) Anchan, S.S.; Prasad, H.C.S.
Due to the rapid growth of population and standard of leaving the Solid waste management has become a worldwide problem. The improper management of Solid waste can cause a hazard to living being and environment. The problem of solid waste management is at the initial stage at South Indian University campus. A detailed survey was done regarding the method of practices associated with sources, quantity generated, collection, transportation, storage and treatment and disposal of solid waste in South Indian University campus. The data were obtained from field visits, interacting with people and questionnaire. The survey data reveals the existing system of solid waste management practices followed in South Indian University campus. © © 2022 Inderscience Enterprises Ltd.