H. S. Manjula ¹, M. Sasikumar ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Jeppiaar Engineering College, Chennai - 600119, Tamil Nadu, IN

Abstract

We report a hysteresis current controller which is used to reduce current harmonics in the wind powered SEIG system. The proposed wind energy conversion system can be modelled and the parameters are verified under the varying wind speed ranges. The overall efficiency of the system can be affected from non-linear inputs and the selection of controllers for harmonic reductions. The controller is used to control the hysteresis band in the current ripple and produced required output voltage. Hysteresis current controller is modelled and the current harmonic interruption is reduced for the wind energy system applications. The system components like Wind Driven SEIG, Rectifier and Hysteresis Current Controller are modeled using MATLAB/Simulink and the experimental results are verified.

Keywords

Hysteresis Current Controller, Self-Excited Induction Generator, Stand Alone Wind Power, Total Harmonic Distortions

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R. Balaji ¹, M. Sasikumar ¹

Affiliations
1 School of Mechanical and Building Science (SMBS), VIT University, Chennai Campus - 600127, Tamil Nadu, IN

Abstract

Objectives: The main objective of this paper to review the various currently available Structural Health Monitoring (SHM) systems for the Polymer Composites particularly in aviation industries. Methods: This paper provides a complete overview about the various types of damage detection technique currently used for the polymer composite structure and also highlights the concept behind the each technique. A brief overview of the research work on experimental and theoretical studies on the various SHM systems is considered and several research papers on these topics are cited. This paper reviews various recent advancement made in the field of damage monitoring techniques, particularly the Piezoresistivity technique with the advent of nanomaterials. Outcomes: This paper serves as an effective source of literature for those interested in pursuing research in the Structural Health Monitoring (SHM) System for the polymer Composites. This paper also provides an effective source of information about the possible research gap in the field the SHM.

Keywords

Composite Materials, Fibre Bragg Grating, Nanomaterials, Piezoresistive Method, Structural Health Monitoring (SHM) System.

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P. A. Prasob ¹, M. Sasikumar ¹, P. Tamil Selvan ¹

Affiliations
1 School of Mechanical and Building Science (SMBS), VIT University, Chennai Campus, Tamil Nadu, IN

Abstract

Background/Objective: The objective of this review paper is to know and verify the mechanical properties especially impact behavior of PMC under subzero temperature. Methods/Statistical Analysis: The focus of this paper is on the use of liquid nitrogen as cryogenic liquid, subzero temperature conditions and the mechanical durability of PMC including tensile strength, compressive strength, shear strength, fatigue. The low velocity impact of PMC is reviewed under the Charpy impact and the Drop weight impact. Also the progressive failure and damage of PMC under impact is given due importance in this paper. Applications/Improvements: Hybridization of PMC with synthetic, natural fibers and micro fillers can enhance the mechanical properties of PMC at liquid nitrogen temperature. Findings: The tensile load response for a composite is very much dependent on the strength properties of the reinforcement fibers, since they are high compared to the resin system on its own. The compression testing of the composites is very challenging due to various reasons. The application of compressive load on the cross section is done in three ways: directly apply the compressive load on the ends of a specimen, loading the edges in shear and mixed shear and direct loading. The compression test results show that the mechanical properties at subzero temperature is comparatively better than properties of the PMC at room temperature. The impact testing of PMC in subzero temperature has better impact strength than PMC tested at room temperature. The reason being the brittleness of the matrix once exposed to liquid nitrogen the layers get contracted on cooling and load transfer does not take place as in the case of composite at room temperature resulting in failure.

Keywords

Cryogenics, Damage, Impact, Polymer Matrix Composite (PMC), Liquid Nitrogen, Subzero.

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K. Bharathi ¹, M. Sasikumar ²

Affiliations
1 Sathyabama University, Chennai – 600019, Tamil Nadu, IN
2 Department of Electrical and Electronics Engineering, Jeppiaar Engineering College, Chennai – 600019, Tamil Nadu, IN

Abstract

Conventional grids are being replaced by smart grids nowadays to improve the transmission efficiency and to incorporate the recent power electronics based compensation devices. The proposed system deals with the voltage compensation using BIST, battery and PV cell for smart grid applications, which has three stages high voltage high frequency bidirectional AC/DC rectifier, bidirectional DC/DC dual active bridge converter and bidirectional DC/AC inverter. This paper mainly focuses on the voltage balancing of DC link which lies between DC/DC converter and DC/AC inverter by connecting two DC sources viz. PV and battery across the capacitor. In order to maintain a constant voltage across the DC link, a droop control with droop curve is proposed for battery and BIST. With this power management system, typical case studies have been analyzed using MATLAB simulation and it was verified with the prototype hardware.

Keywords

Bidirectional Semiconductor Transformer, DAB Converter, Droop Control Technique

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R. Praveen kumar ¹, M. Sasikumar ¹, S. Dinesh Kumar ²

Affiliations
1 School of Mechanical and Building Sciences (SMBS), VIT University, Chennai Campus, Chennai – 600127, Tamil Nadu, IN
2 Department of Automobile Engineering, Karpaga Vinayaga College of Engineering and Technology, Chennai - 600024, Tamil Nadu, IN

Abstract

Objective: The main aim of this paper is redesigning Muffler internal layout to improve the attenuation based on the critical parameters. Analyzing the baseline muffler design, the area of improvement is identified as frequency range of 250Hz–800Hz. Methods: By keeping t h e volume of muffler constant and varying the critical parameters such as perforation size, length of perforations on the pipe, length of intermediate pipes and the position of baffles thirty iterations were performed. Finding: The exhaust gas flow path was modified in the new concept for better attenuation. Second and fourth chambers were made as expansion chambers. First and third chambers were made as Helmholtz chambers. With this basic flow path, further fine tuning was done by varying the critical parameters. Applications: With this current design and optimistic characteristic, the candidate’s muffler design can be used as noise reduction muffler in automobile industries.

Keywords

Acoustics, Muffler, Sensitivity Analysis, Transmission Loss.

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P. A. Prasob ¹, M. Sasikumar ¹, Navneet Bardiya ¹, P. Vasundhra ²

Affiliations
1 School of Mechanical and Building Sciences (SMBS), VIT University, Chennai Campus, Chennai - 600127, Tamil Nadu, IN
2 CVRDE, Defense Research and Development Organization, Avadi, Chennai - 600 054, Tamil Nadu, IN

Abstract

Objectives: The objective of this paper is to study the influence of interface between multi layered composite structures in penetration problems, using finite element solver RADIOSS. Methods/Statistical Analysis: Finite element modeling of the penetrating projectile, multilayer composite and analysis using RADIOSS is done. The analysis is confined to Johnson Cook material model for plasticity and failure. One of the important aspects of material model is the representation of the plasticity and failure region. The modified interface creates a realistic environment with combination of TYPE 2 and TYPE 7 influences multiple hit of projectiles and does not influence the depth of penetration when compared to the TYPE 7 interface. Findings: Hyper Works software tool is used to simulate the projectile penetrating armor plate and Hyper Mesh used for preprocessing and RADIOSS as a solver. The depth of penetration is not significantly affected due to the TYPE 2 interface. However, the delamination behavior of the layers is captured in the TYPE 2 interface when compared to TYPE7. The modified interface with combination of TYPE 2 and TYPE 7 does not influence the depth of penetration when compared to the TYPE 7 interface. TYPE 7 formulations gives considerably acceptable results for capturing the depth of penetration in case of multilayer composite structures. TYPE 2 interfaces has to be studied in cases where delamination has influence, for example in multiple hits of projectiles etc. Application/Improvements: Development of alternative material or sandwich structure is required for the future war scenario to prevent the main threats for Armored Fighting Vehicles (AFVs), shock and penetration as future war scenario insists on light tanks that can withstand penetration with higher order of destruction.

Keywords

Armoured Fighting Vehicle (AFV), Finite Element Modeling, 7.62 mm Projectile, Multi Material.

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R. Balaji ¹, M. Sasikumar ¹, S. Jeyanthi ¹

Affiliations
1 School of Mechanical and building Science (SMBS), VIT University, Chennai Campus, Chennai – 600127,Tamil Nadu, IN

Abstract

Objectives: The core objective of this characterization study is to clarify the effect of reniforement and the geometry of the reinforcement on the mechanical behavior of the vinyl-ester polymer composites. Methods: In this study, Polymer Matrix Composites (PMC) reinforced with both solid glass fiber (E glass) and hollow glass fiber (H glass) is prepared using traditional hand layup technique. Mechanical characterizations are carried out to find the effect of reinforcement on the tensile, compressive, flexural strength and impact resistance of the composites using Universal Testing Machine (UTM) and Charpy Impact. Findings: The characterization study on the mechanical behavior revealed that the hollowness of the fibre reinforcement significantly increased the strength and impact energy absorption capacity of the Hollow glass (H glass) fiber reinforced vinyl ester composites when compared to solid glass (E glass) fiber reinforced vinylester composites. Applications: Be a light weight and high strength materials, Hollow glass reinforced vinyl ester polymer composite can be used in various engineering applications particularly aircraft industry.

Keywords

Composites, Hollow Glass Fiber, Mechanical Characterization, Solid Glass Fiber, Vinylester.

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