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NONLINEAR ADAPTIVE SLIDING MODE CONTROL FOR VEHICLE HANDLING IMPROVEMENT VIA STEER-BY-WIRE
R. KAZEMI,A. A. JANBAKHSH 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.3
This paper proposes a nonlinear adaptive sliding mode control that aims to improve vehicle handling through a Steer-By-Wire system. The designed sliding mode control, which is insensitive to system uncertainties, offers an adaptive sliding gain to eliminate the precise determination of the bound of uncertainties. The sliding gain value is calculated using a simple adaptation algorithm that does not require extensive computational load. Achieving the improved handling characteristics requires both accurate state estimation and well-controlled steering inputs from the Steer-By-Wire system. A second order sliding mode observer provides accurate estimation of lateral and longitudinal velocities while the driver steering angle and yaw rate are available from the automotive sensors. A complete stability analysis based on Lyapunov theory has been presented to guarantee closed loop stability. The simulation results confirmed that the proposed adaptive robust controller not only improves vehicle handling performance but also reduces the chattering problem in the presence of uncertainties in tire cornering stiffness.
M. R. Aghaebrahimi,R. Kazemi Golkhandan,S. Ahmadnia 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Total transfer capability (TTC) represents the maximum power transfer between areas of a power system, while considering its constraints. In modern power systems, it is important to determine the TTC between different areas as it has become a very serious concern for grid designers. This index is used in the operation, design and electricity marketing stages of power systems. In recent years, there is much attention towards the use of renewable energy units in power systems, which increases the necessity of applying probabilistic methods. In this paper, the probabilistic calculations of power transfer capability in the presence of wind farms are performed, applying evolutionary algorithms. In addition, K-means clustering algorithm is applied in clustering the data related to the wind farms" output power. Then, the simulation results obtained from applying evolutionary algorithms are compared with each other. IEEE 30-bus system is used as the test network.
R. Soleimani,F. Mahboubi,S.Y. Arman,M. Kazemi,A. Maniee 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
In this study, the effect of surfactant, phosphorus content, and concentration of SiC nanoparticle on the microstructure and protective performance of electroless Ni–P/nano-SiC coating was studied using electrochemical impedance spectroscopy as well as surface analysis. Through taking advantage of response surface methodology, the experimental results were fed into Design Expert software which then mutual relationships between three independent variables were established. Prediction of model at the experimental range using systematic data enables us to provide a better understanding of the simultaneous effect of variables on the properties of coating. Moreover the optimum concentration of variables was predicted.
High Velocity Impact Response of Basalt Fibers/Epoxy Composites Containing Graphene Nanoplatelets
E. Kazemi-Khasragh,F. Bahari-Sambran,M. Hossein Siadati,R. Eslami-Farsani 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11
The effects of adding surface modified graphene nanoplatelets (GNPs) in various weight percentages (0, 0.1, 0.2, 0.3, 0.4, 0.5 with respect to matrix) on the high velocity impact response of basalt fibers/epoxy composites were evaluated. High speed mechanical stirrer and ultrasonic waves were used for the dispersion of GNPs in the epoxy matrix, and hand layup method was utilized for the fabrication of the composite samples. High velocity impact testing was performed using a conical projectile. The results demonstrated that the maximum improvement in the impact limit velocity and energy absorption occurred in the 0.3 wt.% GNPs nanocomposite, i.e., 11 and 23 %, respectively. Also, the electron microscopy studies revealed that the addition of GNPs contributed in improving the impact properties by influencing the matrix and thus enhancing the interfacial characteristics between the basalt fibers and the matrix.
Weakly stochastic Runge-Kutta method with order 2
Ali R. Soheili,Zahra Kazemi 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.1
Many deterministic systems are described by Ordinary differential equations and can often be improved by including stochastic effects, but numerical methods for solving stochastic differential equations(SDEs) are required, and work in this area is far less advanced than for deterministic differential equations. In this paper,first we follow [7] to describe Runge-Kutta methods with order 2 from Taylor approximations in the weak sense and present two well known Runge-Kutta methods, RK2-TO and RK2-PL. Then we obtain a new 3-stage explicit Runge-Kutta with order 2 in weak sense and compare the numerical results among these three methods.
WEAKLY STOCHASTIC RUNGE-KUTTA METHOD WITH ORDER 2
Soheili, Ali R.,Kazemi, Zahra 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.1
Many deterministic systems are described by Ordinary differential equations and can often be improved by including stochastic effects, but numerical methods for solving stochastic differential equations(SDEs) are required, and work in this area is far less advanced than for deterministic differential equations. In this paper,first we follow [7] to describe Runge-Kutta methods with order 2 from Taylor approximations in the weak sense and present two well known Runge-Kutta methods, RK2-TO and RK2-PL. Then we obtain a new 3-stage explicit Runge-Kutta with order 2 in weak sense and compare the numerical results among these three methods.
( Rokhbakhsh Zamin Farokh ),( Dhara Sachdev ),( Nadia Kazemi Pour ),( Anupama Engineer ),( Karishma R. Pardesi ),( Smita Zinjarde ),( Prashant K. Dhakephalkar ),( Balu A. Chopade ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.6
A total of 31 Acinetobacter isolates were obtained from the rhizosphere of Pennisetum glaucum and evaluated for their plant-growth-promoting traits. Two isolates, namely Acinetobacter sp. PUCM1007 and A. baumannii PUCM1029, produced indole acetic acid (10-13 μg/ml). A total of 26 and 27 isolates solubilized phosphates and zinc oxide, respectively. Among the mineral-solubilizing strains, A. calcoaceticus PUCM1006 solubilized phosphate most efficiently (84 mg/ml), whereas zinc oxide was solubilized by A. calcoaceticus PUCM1025 at the highest solubilization efficiency of 918%. All the Acinetobacter isolates, except PUCM1010, produced siderophores. The highest siderophore production (85.0 siderophore units) was exhibited by A. calcoaceticus PUCM1016. Strains PUCM1001 and PUCM1019 (both A. calcoaceticus) and PUCM1022 (Acinetobacter sp.) produced both hydroxamate- and catechol-type siderophores, whereas all the other strains only produced catechol-type siderophores. In vitro inhibition of Fusarium oxysporum under iron-limited conditions was demonstrated by the siderophore-producing Acinetobacter strains, where PUCM1018 was the most potent inhibitor of the fungal phytopathogen. Acinetobacter sp. PUCM1022 significantly enhanced the shoot height, root length, and root dry weights of pearl millet seedlings in pot experiments when compared with controls, underscoring the plant-growth-promoting potential of these isolates.