Dynamic performance improvement of PMSM drive using fuzzy‑based adaptive control strategy for EV applications

S. Suganthi,R. Karpagam 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3

The permanent magnet synchronous motor (PMSM) is the heart of the electric drive system in electric vehicle technology. The effects of load variation and motor parameter changes are the important key challenges, which deteriorate the dynamicperformances of interior PMSM (IPMSM) drives. To overcome these issues, this study suggests the development of anefficient new control drive system by integrating the Model Reference Adaptive Control (MRAC) with a fuzzy logic controller (FLC) using a finite-element model optimized motor model. The proposed cascaded system comprises two loops: a main outer loop that runs MRAC to mitigate the effects of load variation, and a secondary inner loop with FLC for resilient performance against parametric fluctuations of the IPMSM drive system. The proposed controller uses the hybrid space vector pulse width modulation technique to regulate the switching components of the inverter. It also reduces total harmonic distortion (THD) and torque ripple during the startup of the motor. The overall examination of the PMSM drive system is accomplished by co-simulation using MATLAB and Simcenter MAGNET software. The simulated results demonstrate the superiority of the proposed fuzzy adaptive controller in terms of higher maximum torque and improved speed tracking accuracy. A prototype of the proposed PMSM is developed and validated by experiment, which shows the robustness of the proposed methodology against load and speed fluctuations by reducing THD and torque ripples.

An Advanced Efficient Secured Blind Authentication and Verification Crypto Protocol

S. Princy Suganthi Bai,S. Selvakani Kandeeban 보안공학연구지원센터 2011 International Journal of Future Generation Communi Vol.4 No.3

Stackelberg Game between Multi-Leader and Multi-Follower for Detecting Black Hole and Warm Hole Attacks In WSN

S.Suganthi,D.Usha International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.8

Objective: • To detect black hole and warm hole attacks in wireless sensor networks. • To give a solution for energy depletion and security breach in wireless sensor networks. • To address the security problem using strategic decision support system. Methods: The proposed stackelberg game is used to make the spirited relations between multi leaders and multi followers. In this game, all cluster heads are acts as leaders, whereas agent nodes are acts as followers. The game is initially modeled as Quadratic Programming and also use backtracking search optimization algorithm for getting threshold value to determine the optimal strategies of both defender and attacker. Findings: To find optimal payoffs of multi leaders and multi followers are based on their utility functions. The attacks are easily detected based on some defined rules and optimum results of the game. Finally, the simulations are executed in matlab and the impacts of detection of black hole and warm hole attacks are also presented in this paper. Novelty: The novelty of this study is to considering the stackelberg game with backtracking search optimization algorithm (BSOA). BSOA is based on iterative process which tries to minimize the objective function. Thus we obtain the better optimization results than the earlier approaches.

Graphene quantum dots synthesis and energy application: a review

S. Akash Prabhu,V. Kavithayeni,R. Suganthy,K. Geetha 한국탄소학회 2021 Carbon Letters Vol.31 No.1

Graphene Quantum Dots (GQDs), zero-dimensional nanoparticles which are derived from carbon-based sources owned the new pavement for the energy storage applications. With the varying synthesis routes, the in-built properties of GQDs are enhanced in different categories like quantum efficiency, nominal size range, and irradiation wavelength which could be applied for the several of energy and optoelectronics applications. GQDs are especially applicable in the specific energy storage devices such as super capacitors, solar cells, and lithium-ion batteries which were demonstrated in this work. This paper critically reviews about the synthesis techniques used for the GQDs involving energy storage applications with increased capacitance, energy conversion, retention capability, and stability.

Fabrication of mesoporous BaTiO3/SnO2 nanorods with highly enhanced photocatalytic degradation of organic pollutants

S. Selvarajan,P. Malathy,A. Suganthi,M. Rajarajan 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-

Novel UV–vis-light-driven BaTiO3/SnO2 nanocomposites with three different molar ratios (1%, 3%, 5%) were synthesized by hydrothermal and precipitation deposition methods. The successfully characterized by UV-visible diffuse reflectance spectroscopy (DRS), FT-IR spectroscopy, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), photoluminescence spectroscopy (PL), and Brunauer–Emmett–Teller surface area analysis (BET) techniques. The lmax of the prepared nanocomposite was highly red shifted from 220 nm to 410 nm compared to the bare metal oxides. The degradation of organic pollutants such as o-Chloroaniline (o-CLA) and methylene blue (MB) were studied using the prepared nanocomposite. The nanocomposite with molar ratio of 3% BaTiO3/SnO2 photocatalyst possesses excellent photocatalytic activity than the nanocomposite with molar ratio 1% BaTiO3/SnO2, 5% BaTiO3/SnO2, and the individual components BaTiO3, SnO2. The band edges of materials have been theoretically calculated on the basis of Mullikan electronegativity of atoms. The effect of operational parameters such as; pollutant concentration, pH, catalyst loading, OH radical trapping and COD (carbon oxygen demand) have been investigated in details. The kinetics of the photodegradation reactions were correlated with the pseudofirst- order model. The stability of nanocomposite was examined by recycling experiments.

Effect of Food Seasoning Spices Mixture on Biomarkers of Oxidative Stress in Tissues of Fructose-Fed Insulin-Resistant Rats

C.V. Anuradha,R. Suganthi,S. Rajamani,M.K. Ravichandran 한국식품영양과학회 2007 Journal of medicinal food Vol.10 No.1

High fructose feeding in normal rats induces insulin resistance and also facilitates oxidative damage. The pre-sent study examines the effects of a spices mixture (SM) on oxidative stress markers and antioxidant potential in tissues ofhigh fructose-fed insulin-resistant rats. Male Wistar rats received a semisynthetic diet containing either 60% fructose or 60%starch. SM administration at three different doses (10, 30, and 50 mg/day per rat) was initiated orally 15 days later and con-tinued for the next 30 days. After the total experimental period of 45 days, peroxidation of lipids and antioxidant status inliver and kidney were quantified. Fructose-treated rats showed increased levels of peroxidation indices such as thiobarbituricacid-reactive substances and lipid hydroperoxides in tissues. The condition was associated with an inadequate antioxidant sys-tem. Administration of SM along with fructose diet reduced the levels of peroxidation markers in tissues and improved theantioxidant status. The positive effect of SM on the oxidantantioxidant balance could be attributed to the active constituentsof the different spices present in the mixture.

Food Seasoning Spices Mixture Improves Glucose Metabolism and Lipid Profile in Fructose-Fed Hyperinsulinemic Rats

C.V. Anuradha,S. Rajamani,R. Suganthi,M.K. Ravichandran 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.4

Fructose feeding has been shown to induce insulin resistance in rats, associated with hyperinsulinemia, hy-perglycemia, and hypertriglyceridemia. We have investigated the effect of administering food seasoning spices mixture (SM)on glucose, insulin, and lipids in circulation and carbohydrate enzymes in the erythrocytes of high fructose-fed rats. Addi-tionally, we also measured the protein glycation status by assaying the levels of glycated hemoglobin, fructosamine, and plasmaprotein glycation. Male Wistar rats received a daily diet containing either 60% fructose or 60% starch (control). The rats wereadministered SM at three different doses (10, 30, or 50 mg/day per rat) orally 15 days later. At the end of the 45-day exper-imental period, fructose-fed rats showed significantly higher levels of plasma glucose and insulin, dyslipidemia, and alter-ations in enzyme activities. Treatment with SM significantly reduced plasma glucose and insulin levels and brought about afavorable lipid profile. In these rats, the activities of enzymes of glucose metabolism were normal. These effects were ob-served at all three doses of SM. High homeostasis model assessment (HOMA) values indicated insulin resistance in fructose-fed rats, while the HOMA values in SM-treated fructose-fed rats were comparable to those of control rats. We conclude thatadministration of SM improves glucose metabolism and plasma lipid profile in fructose-fed rats, possibly through improvedinsulin-sensitizing actions of the active constituents.

Eugenol alters the integrity of cell membrane and acts against the nosocomial pathogen Proteus mirabilis

K. Pandima Devi,R. Sakthivel,S. Arif Nisha,N. Suganthy,S. Karutha Pandian 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.3

Eugenol, a member of the phenylpropanoidsclass of chemical compounds, is a clear to pale yellow oilyliquid extracted from certain essential oils especially fromclove oil, nutmeg, cinnamon, and bay leaf. The antibacterialactivity of eugenol and its mechanism of bactericidalaction against Proteus mirabilis were evaluated. Treatmentwith eugenol at their minimum inhibitory concentration[0.125 % (v/v)] and minimum bactericidal concentration[0.25 % (v/v)] reduced the viability and resulted in completeinhibition of P. mirabilis. A strong bactericidal effecton P. mirabilis was also evident, as eugenol inactivated thebacterial population within 30 min exposure. Chemoattractantproperty and the observance of highest antibacterialactivity at alkaline pH suggest that eugenol can workmore effectively when given in vivo. Eugenol inhibits thevirulence factors produced by P. mirabilis as observed byswimming motility, swarming behavior and urease activity. It interacts with cellular membrane of P. mirabilis andmakes it highly permeable, forming nonspecific pores onplasma membrane, which in turn directs the release of260 nm absorbing materials and uptake of more crystalviolet from the medium into the cells. SDS–polyacrylamidegel, scanning electron microscopy and Fourier transforminfrared analysis further proves the disruptive action ofeugenol on the plasma membrane of P. mirabilis. Thefindings reveal that eugenol shows an excellent bactericidalactivity against P. mirabilis by altering the integrity of cellmembrane.

In vitro sustained release of amoxicillin from lanthanum hydroxyapatite nano rods

M.I. Ahymah Joshy,K. Elayaraja,R.V. Suganthi,Sarath Chandra Veerla,S. Narayana Kalkura 한국물리학회 2011 Current Applied Physics Vol.11 No.4

Nano rods (∼100 nm) of pure hydroxyapatite [Ca_10(PO_4)_6(OH)_2)-HAp] and lanthanum doped HAp was synthesized by sol-gel route using calcium nitrate and diammonium hydrogen phosphate as precursors. The samples were without La_2O_3 or β-TCP phases, which were present in samples prepared by solid state and co-precipitation technique. Increase in the concentration of lanthanum lead to the enhancement of crystallinity and crystallite size. In addition, increase in specific surface area (31%) and hardness (14%)was observed in doped samples. The studies using PBS revealed a decrease in the dissolution of the samples as the dopant concentration increased. Further, the doping extended the amoxicillin release from the samples. Bactericidal effect against Gram positive and Gram negative bacteria indicated high antimicrobial resistant activity of these samples.