A Novel Solar Photovoltaic Integrated Modified SEPIC High Gain DC–DC Converter Using Evolutionary Algorithms for Electric Vehicle Battery Applications

Rajasekaran S.,Suresh S.,Ramkumar A.,Karthikeyan K. 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5

Using MPPT and the Improved Non-Dominated Sorting Genetics (NSGA-II/INSGA-II) algorithm method for constant switching with design optimization, this study prefers a solar photovoltaic incorporated dc to dc boosting converter at the front ends of the existing methodology of DC–DC converters for electric vehicles battery charging applications. According to the literature, the recognized converter architecture combined with traditional evolutionary computation like PSO and GA results in low voltage gain, circuits parasitic effects that lead to low conversion efficiency, excessive output side rippling contents, and subpar controller’s performances. By combining the reconfigured SEPIC Converter (MSEPIC) with MPPT-based NSGA-II methodologies, an exertion is designed to improve the overall performance of the system. This improves load side performance in terms of conversion accuracy and greater voltage gain attributed to the impact of a coupled inductors, and minimizes the effects of circuit parasitic. The ideal gained constants generated by the suggested optimal solution lower the outputs side dc rippling contents. To achieve effective power density, the system’s temperature layout should be finished. With basic process variables of (600–650) W is fixated with a controlling frequency of 15 kHz at the boosting phase and is designed to simulate using the MATLAB structure, the voltage stability transformation is improved from Solar photovoltaic voltage of 25 VDC to 75 VDC to start charging a battery pack of 48 V. The batteries’ impedances is configured as an RC demand with serial capacities of 12 V and 7 Ah, respectively. The system’s photovoltaic efficiency can be enhanced by the upgraded Incremental Conductance (IC) MPPT method. To show the technological importance of the recommended converter, a 100 W experimental design is created and its technical performances are contrasted and investigated.

Prediction of concrete strength using serial functional network model

S.Rajasekaran,Seung-ChangLee 국제구조공학회 2003 Structural Engineering and Mechanics, An Int'l Jou Vol.16 No.1

Free vibration of tapered arches made of axially functionally graded materials

S. Rajasekaran 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.4

The free vibration of axially functionally graded tapered arches including shear deformation and rotatory inertia are studied through solving the governing differential equation of motion. Numerical results are presented for circular, parabolic, catenary, elliptic and sinusoidal arches with hinged-hinged, hinged-clamped and clamped-clamped end restraints. In this study Differential Quadrature element of lowest order (DQEL) or Lagrangian Interpolation technique is applied to solve the problems. Three general taper types for rectangular section are considered. The lowest four natural frequencies are calculated and compared with the published results.

Implementation of an A-Source DC–DC Boost Combination Phase-Shifting Full-Bridge Converter for Electric Car Rapid Charging Applications

Rajasekaran S.,Suresh S.,Karthikeyan K.,Bhuvanesh A. 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4

In this paper, a DC–DC boost converter is favored at the front ends of the usual power electronic converters for electric car rapid charging purposes utilizing Solar Photovoltaic System, which is included by a full-bridge converter with discontinuous switching designs. The influence of circuitry parasite adds substantially towards power dissipation and lowers efficiency. An effort is made on the overall system by incorporating the A-Source Boost Converter with the Phase Shifted Full Bridge Converters that improve performance with high conversion efficiency and minimize the impacts of network parasitic. The entire structure would be electronically managed, using efficient MPPT, including boosting techniques for solar conversions and zero voltage switching on the full-bridge conversion via comprehensive protective measures. The system’s thermal design must be complete to ensure efficient power density. For optimal efficiency, the voltage stability transition is increased from Solar photovoltaic voltage of 25–75 VDC to start charging a rechargeable battery of 48 V with standard system parameters of (200–250) W is focused with an operating frequency of 15 kHz at the boosting stage but also 120 kHz at the full-bridge phase and is simulated using the MATLAB framework. The improved Incremental Conductance MPPT approach improves the system’s photovoltaic performance. The 100 W experimental design is produced its technical performance in comparison and examined to demonstrate the technical significance of the suggested converter.

Solution method for the classical beam theory using differential quadrature

S. Rajasekaran,L. Gimena,P. Gonzaga,F.N. Gimena 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.6

In this paper, a unified solution method is presented for the classical beam theory. In Strength of Materials approach, the geometry, material properties and load system are known and related with the unknowns of forces, moments, slopes and deformations by applying a classical differential analysis in addition to equilibrium, constitutive, and kinematic laws. All these relations are expressed in a unified formulation for the classical beam theory. In the special case of simple beams, a system of four linear ordinary differential equations of first order represents the general mechanical behaviour of a straight beam. These equations are solved using the numerical differential quadrature method (DQM). The application of DQM has the advantages of mathematical consistency and conceptual simplicity. The numerical procedure is simple and gives clear understanding. This systematic way of obtaining influence line, bending moment, shear force diagrams and deformed shape for the beams with geometric and load discontinuities has been discussed in this paper. Buckling loads and natural frequencies of any beam prismatic or non-prismatic with any type of support conditions can be evaluated with ease.

Buckling of fully and partially embedded non-prismatic columns using differential quadrature and differential transformation methods

S. Rajasekaran 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.28 No.2

Numerical solution to buckling analysis of beams and columns are obtained by the method of differential quadrature (DQ) and harmonic differential quadrature (HDQ) for various support conditions considering the variation of flexural rigidity. The solution technique is applied to find the buckling load of fully or partially embedded columns such as piles. A simple semi- inverse method of DQ or HDQ is proposed for determining the flexural rigidities at various sections of non-prismatic column ( pile) partially and fully embedded given the buckling load , buckled shape and sub-grade reaction of the soil. The obtained results are compared with the existing solutions available from other numerical methods and analytical results. In addition, this paper also uses a recently developed technique, known as the differential transformation (DT) to determine the critical buckling load of fully or partially supported heavy prismatic piles as well as fully supported non-prismatic piles. In solving the problem, governing differential equation is converted to algebraic equations using differential transformation methods (DT) which must be solved together with applied boundary conditions. The symbolic programming package, Mathematica is ideally suitable to solve such recursive equations by considering fairly large number of terms.

Solution method for the classical beam theory using differential quadrature

Rajasekaran, S.,Gimena, L.,Gonzaga, P.,Gimena, F.N. Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.6

In this paper, a unified solution method is presented for the classical beam theory. In Strength of Materials approach, the geometry, material properties and load system are known and related with the unknowns of forces, moments, slopes and deformations by applying a classical differential analysis in addition to equilibrium, constitutive, and kinematic laws. All these relations are expressed in a unified formulation for the classical beam theory. In the special case of simple beams, a system of four linear ordinary differential equations of first order represents the general mechanical behaviour of a straight beam. These equations are solved using the numerical differential quadrature method (DQM). The application of DQM has the advantages of mathematical consistency and conceptual simplicity. The numerical procedure is simple and gives clear understanding. This systematic way of obtaining influence line, bending moment, shear force diagrams and deformed shape for the beams with geometric and load discontinuities has been discussed in this paper. Buckling loads and natural frequencies of any beam prismatic or non-prismatic with any type of support conditions can be evaluated with ease.

Buckling of fully and partially embedded non-prismatic columns using differential quadrature and differential transformation methods

Rajasekaran, S. Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.28 No.2

Numerical solution to buckling analysis of beams and columns are obtained by the method of differential quadrature (DQ) and harmonic differential quadrature (HDQ) for various support conditions considering the variation of flexural rigidity. The solution technique is applied to find the buckling load of fully or partially embedded columns such as piles. A simple semi- inverse method of DQ or HDQ is proposed for determining the flexural rigidities at various sections of non-prismatic column ( pile) partially and fully embedded given the buckling load, buckled shape and sub-grade reaction of the soil. The obtained results are compared with the existing solutions available from other numerical methods and analytical results. In addition, this paper also uses a recently developed technique, known as the differential transformation (DT) to determine the critical buckling load of fully or partially supported heavy prismatic piles as well as fully supported non-prismatic piles. In solving the problem, governing differential equation is converted to algebraic equations using differential transformation methods (DT) which must be solved together with applied boundary conditions. The symbolic programming package, Mathematica is ideally suitable to solve such recursive equations by considering fairly large number of terms.

Damage detection in beams and plates using wavelet transforms

S. Rajasekaran,S. P. Varghese 한국계산역학회 2005 Computers and Concrete, An International Journal Vol.2 No.6

A wavelet based approach is proposed for structural damage detection in beams, plate and delamination of composite plates. Wavelet theory is applied here for crack identification of a beam element with a transverse on edge non-propagating open crack. Finite difference method was used for generating a general displacement equation for the cracked beam in the first example. In the second and third example, damage is detected from the deformed shape of a loaded simply supported plate applying the wavelet theory. Delamination in composite plate is identified using wavelet theory in the fourth example. The main concept used is the breaking down of the dynamic signal of a structural response into a series of local basis function called wavelets, so as to detect the special characteristics of the structure by scaling and transformation property of wavelets. In the light of the results obtained, limitations of the proposed method as well as suggestions for future work are presented. Results show great promise of wavelet approach for damage detection and structural health monitoring.

Optimization of Shell and Tube Heat Exchangers Using modified Genetic Algorithm

S.Rajasekaran,T.Kannadasan 보안공학연구지원센터 2010 International Journal of Control and Automation Vol.3 No.4