Annamalai UniversityTamilnadu

Annāmalainagar, India

Annamalai UniversityTamilnadu

Annāmalainagar, India
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Gowthaman S.,Annamalai UniversityTamilnadu | Sathiyagnanam A.P.,Annamalai UniversityTamilnadu
International Journal of Applied Engineering Research | Year: 2015

The Performance and emission characteristics of biodiesel fuelled Homogeneous charge compression ignition engine are experimentally investigated. Mango seed methyl ester was used as a fuel in HCCI mode engine, produced by transesterification process from the raw mango seed oil. The experimental investigation is conducted in single cylinder, four stroke, water cooled kirloskar SV1 diesel engine. For this research purpose, the base DI diesel engine has been modified as HCCI mode engine by replace the in cylinder fuel injector from cylinder head into intake manifold of the engine. The port injection system is used to prepare the homogeneous mixture before start of combustion process. In this study, the experimental investigation was conducted in HCCI mode engine using neat diesel, neat biodiesel and diesel – biodiesel as B25, B50 and B75 with different brake power on the engine and constant speed conditions. From the result it was observed that, the specific fuel consumption of B50 blend has lower value than other blends and neat diesel and biodiesel. Brake thermal efficiency of the engine is depends on energy content of the fuel and combustion efficiency. In this experimental work, it was found that the blend of B50 has maximum brake thermal efficiency compared with other blends. The exhaust harmful emission of oxides of nitrogen (NOx) and particulate matter (PM) have reduced for all the blends than the conventional diesel engine. However other emissions of CO and HC are slightly increased for all the blend of Diesel-Biodiesel. © Research India Publications.


Venkatasubramanian D.,Annamalai UniversityTamilnadu | Natarajan S.P.,Annamalai UniversityTamilnadu
International Journal of Power Electronics and Drive Systems | Year: 2016

Controlled rectifiers are considered as the most important hardware part in the field of HVDC systems in transmission lines and can be used for a number of power electronics based system operation, control and utility applications. In this paper, a brief design of a 12-pulse, 24-pulse, 36-pulse and a 48-pulse converter connected to the grid is presented along with the harmonic and ripple current analysis with its comparison statistics and thus providing a justification for the suitable ones. The performance of the 12, 24, 36 and 48-pulse converters are compared for their effectiveness in both quantitatively as well as qualitatively. Further, comparison of the 48-pulse converter on its THD and current ripple which is connected towards the grid with simple pulse width modulation technique is also proposed. It combines all features of the low switching concepts and DC current reinjection techniques. Some basic topological explanation of the controlled rectifiers and simulation results using MATLAB are also presented in this paper in order to justify the harmonic analysis. The simulation results along with the quantitative results shows the effectiveness of the proposed scheme for the cancelation or the elimination of the harmonics result in maximum harmonic mitigation, for high power utility applications, the 48-pulse converter is most fitting to improve the conversion efficiency, low di/dt and dv/dt and active and reactive power controllability. © 2016 Institute of Advanced Engineering and Science. All rights reserved.


SIVAKUMAR G.,Annamalai UniversityTamilnadu | ANANTHI V.,Annamalai UniversityTamilnadu | RAMANATHAN S.,Annamalai UniversityTamilnadu
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2017

Different mass fractions (0, 5%, 10%, and 15%) of the synthesized nano SiC particles reinforced Ti–6Al–4V (Ti64) alloy metal matrix composites (MMCs) were successfully fabricated by the powder metallurgy method. The effects of addition of SiC particle on the mechanical properties of the composites such as hardness and compressive strength were investigated. The optimum density (93.33%) was obtained at the compaction pressure of 6.035 MPa. Scanning electron microscopic (SEM) observations of the microstructures revealed that the wettability and the bonding force were improved in Ti64 alloy/5% nano SiCp composites. The effect of nano SiCp content in Ti64 alloy/SiCp matrix composite on phase formation was investigated by X-ray diffraction. The correlation between mechanical parameter and phase formation was analyzed. The new phase of brittle interfaced reaction formed in the 10% and 15% SiCp composite specimens and resulted in no beneficial effect on the strength and hardness. The compressive strength and hardness of Ti64 alloy/5% nano SiCp MMCs showed higher values. Hence, 5% SiCp can be considered to be the optimal replacement content for the composite. © 2017 The Nonferrous Metals Society of China


Vaishnavi D.,Annamalai UniversityTamilnadu | Subashini T.S.,Annamalai UniversityTamilnadu
Journal of Electrical Engineering and Technology | Year: 2015

This paper proposes a novel watermarking method to discover the tampers and localize it in digital image. The image which is to be used to generate a watermark is first wavelet decomposed and the edge feature from the sub bands of high frequency coefficients are retrieved to generate a watermark (Edge Feature Image) and which is to be embed on the cover image. Before embedding the watermark, the pixels of cover image are disordered through the Arnold Transform and this helps to upgrade the security of the watermark. The embedding of generated edge feature image is done only on the Least Significant Bit (LSB) of the cover image. The invisibleness and robustness of the proposed method is computed using Peak-Signal to Noise Ratio (PSNR) and Normalized Correlation (NC) and it proves that the proposed method delivers good results and the proposed method also detects and localizes the tampers efficiently. The invisibleness of proposed method is compared with the existing method and it proves that the proposed method is better. © The Korean Institute of Electrical Engineers.


Gowthaman S.,Annamalai UniversityTamilnadu | Sathiyagnanam A.P.,Annamalai UniversityTamilnadu
International Journal of Applied Engineering Research | Year: 2015

Biodiesel has suitable alternative fuel for diesel engine with high thermal efficiency and lower exhaust emissions of CO and HC. But biodiesel fuelled engine has higher level of smoke and oxides of nitrogen emissions in the exhaust due to higher viscosity and more oxygen molecules in the biodiesel compared to reference diesel. In order to overcome these limitations and further reduce the emission in biodiesel fuelled engine, a homogeneous charge compression ignition engine is suitable replacement for conventional DI diesel engine. The homogeneous charge compression ignition engines are capable of providing more power output especially at high load and reducing exhaust emissions of oxides of nitrogen (NOx) and soot than conventional diesel engine. This study, investigate the combustion, performance and emission characteristics of HCCI engine using cotton seed biodiesel as a primary fuel. And also analyse the effect of charge temperature on HCCI combustion parameters such as start of combustion (SOC) and combustion duration and analyse the changes in HCCI engine performance and emission parameters. The experimental investigations have been conducted with different inlet charge temperatures of 90°C, 100°C, 110°C, 120°C, 130°C, 140°C and limited the charge temperature for poor output and higher level of emissions of HCCI engine. This paper described the result of ultra low NOx and soot emissions in biodiesel fuelled HCCI engine compared to diesel engine. The NOx and soot emissions are reduced about 40% and 28% respectively than convention diesel engine. The result of this study indicated that the HCCI engine has consumed less amount of fuel and produced higher power output at high load operation. And the result shows, the brake thermal efficiency (BTE) has been increased with increasing the charge temperature. Because of the higher inlet air temperature could reduced the ignition delay and combustion duration of the charge. The inlet charge temperature could reflect on HC and CO emissions and result showed that, there is slight reduction in HC and CO emissions in biodiesel fuelled engine. © Research India Publications.


Punitha A.,Annamalai UniversityTamilnadu | Geetha M.K.,Annamalai UniversityTamilnadu
International Journal of Imaging and Robotics | Year: 2016

The most important factor that degrades the performance of a facial expression recognition system is the presence of face occlusions due to scarves, hat, sunglasses, mask etc., Occlusion results in loss of discriminative information, particularly with the case of lower face occlusion, the mouth region where most of the emotions are expressed. Hence a novel block based approach to deal with expression recognition in the presence of partial occlusion has been examined to confirm the portion of the face that holds the foremost discriminative part for emotion classification. Four different types of occlusions namely- eye/upper, mouth/lower, right and left face occlusions are handled in this paper and bayesian network (BN) and support vector machine (SVM) are exploited in emotion recognition from the occluded facial expressions. Experiments are conducted with images of varying block sizes. © 2016 [International Journal of Imaging and Robotics].


Vaishnavi D.,Annamalai UniversityTamilnadu | Subashini T.S.,Annamalai UniversityTamilnadu
International Journal of Applied Engineering Research | Year: 2014

In this paper, a robust image watermarking method is proposed to alleviate the geometric distortion problems. In this method, a logo is chosen as watermark and is embedded in the DC coefficients of normalized host image. Normalized image is acquired by transforming the image to its original co-ordinate position using the affine parameters. These parameters are estimated by the geometric moments of an image. The security of the proposed method is increased by employing the Arnold scrambling on the logo watermark before embedding on it. The performance of the proposed method is quantified using the Peak-Signal-to-Noise Ratio (PSNR) and Normalized Correlation (NC) metrics. The robustness of the proposed method is compared with the existing method and it proves that the proposed method is highly resilient to geometric distortions. © Research India Publications.


Biju E.R.,Annamalai UniversityTamilnadu | Anitha M.,Annamalai UniversityTamilnadu
International Journal of Applied Engineering Research | Year: 2015

The aim of expansion planning of distribution system is to determine the capacity, reinforcement of distribution substation unit and addition or upgradation of distribution feeders to meet the growing load demand in future. This paper addresses the multistage radial distribution system (RDS) expansion planning problem in the presence of distributed generator (DG) in a multiobjective optimization framework. In addition, the reliability of the RDS has been enhanced by employing reconfiguration of RDS as a failure rate reduction strategy. Expected interruption cost (ECOST) corresponding to interruption duration time is calculated using a composite customer damage function (CCDF). The complex multiobjective optimization problem has been solved using bacterial foraging algorithm (BFA). In order to evaluate the proposed algorithm, standard IEEE 33 bus is used as a test system. Different case studies were carried out on the test system and in all the case studies, customer and energy based reliability indices, i.e. SAIFI, SAIDI, CAIDI, AENS and ASAI have been determined. © Research India Publications.


Thiyagarajan V.S.,Annamalai UniversityTamilNadu | Venkatachalapathy K.,Annamalai UniversityTamilNadu
International Journal of Applied Engineering Research | Year: 2015

Clustering plays a major role in handling large data sets to do their relevant process in various domains. The main issue is the identification of clusters in multi-dimensional data sets. It also has the open problem of privacy and security issues. To overcome these challenges, we propose the clustering algorithm of Apriori enhancement algorithm for directly mines frequent closed itemsets. Multi dimensional data sets produce the best quality of clustering for the user needs because the datasets are gathering from various domains. The slicing can be used to handle the high dimensional data in the difficult situation. Slicing can support both the horizontal and vertical processes of the large data set; for that we will use both of the process. Initially the input data are divided into subsets; then the data are given as the inputs for another process. For that the horizontal process is used to reduce the time complexity and cost of the overall process. Vertical grouping of attributes is used to help the privacy preservation. Finally divided subsets are combined with the help of group heads. © Research India Publications.


Syed Aalam C.,Annamalai UniversityTamilnadu | Saravanan C.G.,Annamalai UniversityTamilnadu
International Journal of ChemTech Research | Year: 2015

Biodiesel, which is derived from vegetable oil (triglycerides) by transesterification with ethanol, has the significant notice during the past decade as a nontoxic, biodegradable, and renewable fuel. Several processes for biodiesel fuel production have been developed, amongst which transesterification by alkali catalysis gives high levels of conversion of triglycerides to their corresponding ethyl esters. In this paper, biodiesel produced from Mahua vegetable oil through catalytic transesterification using ethanol and potassium hydroxide as catalyst. The properties of biodiesel were analyzed using ASTM standard methods. From the tests it is clear that the, properties of Mahua biodiesel are similar to diesel fuel. © 2015, Sphinx Knowledge House. All rights reserved.

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