Pandu Rangadu - Academia.edu (original) (raw)

Papers by Pandu Rangadu

To hold and have their share in the present unpredictable market, the companies are heading towar... more To hold and have their share in the present unpredictable market, the companies are heading toward the alternative techniques for designing and manufacturing. Web-based technologies have the capability to blend into the context of engineering design and manufacturing. This paper illustrates a preliminary approach for developing an online knowledge-based system for CAD modeling and manufacturing. The purpose of developing this system is to cut down the CAD modeling and manufacturing time and thereby reducing the production cost. The parametric modeling technique has been incorporated in the proposed system along with the macro codes for generation of the CAD model. The generated CAD model is the intermediate output of the proposed system and is the input to the CNC code generator to carry out the manufacturing processes. An inference engine and relevant Web UI were developed for assisting the design engineers.

International Letters of Chemistry, Physics and Astronomy, Aug 6, 2014

In the present research presents influence of coupling agent 1 % triethoxymethyl silane sprayed o... more In the present research presents influence of coupling agent 1 % triethoxymethyl silane sprayed on to the wollastonite particulate powder before it dispersed into the vinylester/composites. Firstly two different composites were developed in which wollastonite is filled with vinylester resin and same wollastonite was sprayed with coupling agent 1 % triethoxymethyl silane then filled with vinylester resin. The particle functionalization with a bi-functional coupling agent 1 % triethoxymethyl silane was observed to have a significant effect on the curing process and subsequent physical properties of the composites. Wollastonite functionalization favors the composite fabrication with a lower curing temperature as compared to the as-received particle filled vinyl ester resin composites. Thermogravimetric analysis showed an increased thermo-stability in the particles functionalized filled vinyl ester resin composites as compared to the unmodified particle filled counterparts. The uniform particle dispersion and the chemical bonding between filler and vinyl ester resin matrix were found to contribute to the increased thermal stability and enhanced tensile strength and modulus.

IJITR, Sep 29, 2014

The demand and price of petroleum based fuels are increasing at an alarming rate. If this situati... more The demand and price of petroleum based fuels are increasing at an alarming rate. If this situation continues there is every chance for the scarcity of petroleum products. A major solution to reduce this problem is to search for an alternative fuels. One of the best alternatives is Biodiesels obtained from different vegetable oils. The present study focuses on comparison of performance and emission characteristics of a single cylinder four stoke diesel engine with two different biodiesels namely Mahua and Cotton seed biodiesels blended with diesel separately. The performance of the engine with biodiesel blend B20 as fuel is compared with the diesel fuel on the basis of brake specific fuel consumption, brake thermal efficiency, exhaust gas temperature and emissions of hydrocarbons and oxides of nitrogen. This study reveals that the performance of the engine with these biodiesel blends differ marginally from diesel and hydrocarbon emissions are less than diesel. It is also observed that the cotton seed biodiesel blends are showing better performance and emission characteristics as compared with Mahua biodiesel blends.

Hybrid fiber are touted with the help of mercerization technique in order to promote the properti... more Hybrid fiber are touted with the help of mercerization technique in order to promote the properties of host Sansevieria cylindrica (Sc) and Sisal(Sl) hybrid fibers in the blend composites followed by synthesized and tested. The developments of high performance composite materials employed from locally available-sources. The objective of this research was to evaluate the mechanical performance (tensile, bending and impact strength) of blended Epoxy (Ey) and Polyester (Pr) in the ratio of 85/15(Wt./Wt.) filled with Sansevieria cylindrica(Sc) at different compositions (3,5,10,20 and 30wt%), using the extrusion and hot press molding technique. Results showed that Sc10: Ey/Pr (75/15) mixture was found better performance among the composites prepared. Because of the suitability of Sansevieria cylindrica (Sc) as filler in Ey/Pr blended composite as shown in our previous work, and yet Sansevieria cylindrica is subjected to hybridize with sisal (Sl) short fibre in Ey/Pr blended composite to achieve superior mechanical performance. Dielectric strength was increased gradually up to 30wt% of Sc fiber content. Thus due to good immiscibility of epoxy/polyester brought a windfall on dielectric strength, water sorption capacity, degradation behaviour such as simulating weathering and soil buried test and yet proved cost effective, co-friendly and state of art blended composites are always go hand in hand.

International Journal of Innovative Research in Science, Engineering and Technology, Oct 15, 2014

The gradual depletion of petroleum based fuels and the impact of environmental pollution led the ... more The gradual depletion of petroleum based fuels and the impact of environmental pollution led the researchers to search for an alternative fuels. One of the best alternatives is Biodiesels obtained from different vegetable oils. The present study focuses on comparison of performance and emission characteristics of a single cylinder four stoke diesel engine with two different biodiesels namely Karanja and Cotton seed biodiesels blended with diesel separately. The performance of the engine with biodiesel blend B20 as fuel is compared with the diesel fuel on the basis of brake specific fuel consumption, brake thermal efficiency, exhaust gas temperature and emissions of hydrocarbons and oxides of nitrogen. This study reveals that the performance of the engine with these biodiesel blends differ marginally from diesel and hydrocarbon emissions are less than diesel. It is also observed that the cotton seed biodiesel blends are showing better performance and emission characteristics as compared with Karanja biodiesel blends.

In recent years the research for alternative fuels has become inevitable due to fast depletion of... more In recent years the research for alternative fuels has become inevitable due to fast depletion of fuels and huge demand for diesel in transport, power and agricultural sectors. One of the best alternatives is Bio Diesels obtained from different bio diesel. The present study focuses on comparison of performance and emission characteristics of a single cylinder four stoke diesel engine with two different biodiesels namely Jatropha oil and Cotton seed oil separately. The performance is compared on the basis of brake specific fuel consumption, brake thermal efficiency, exhaust gas temperature and emissions of hydrocarbons and oxides of nitrogen. This study reveals that the performance of the engine with these biodiesels differ marginally from diesel and hydrocarbon emissions are less than diesel. It is also observed that the cotton seed oil showing better performance and emission characteristics as compared with Jatropha oil.

— Over the last two decades there has been a tremendous increase in the number of automobiles thr... more — Over the last two decades there has been a tremendous increase in the number of automobiles throughout the world. Due to this the price of fuel was going up day by day and there will be no more conventional fuels in future. This is also causing an increasing the environmental pollution by the usage of crude oils. A better solution to reduce this problem is to search for an alternative fuels. One of the best alternatives is Biodiesels obtained from different vegetable oils. The present study focuses on comparison of performance and emission characteristics of a single cylinder four stoke diesel engine with two different biodiesels namely Mahua and Jatropha biodiesels blended with diesel separately. The performance of the engine with biodiesel blend B20 as fuel is compared with the diesel fuel on the basis of brake specific fuel consumption, brake thermal efficiency, exhaust gas temperature and emissions of hydrocarbons and oxides of nitrogen. This study reveals that the performance...

In recent years the search for alternative fuels has become inevitable due to fast depletion of f... more In recent years the search for alternative fuels has become inevitable due to fast depletion of fuels and huge demand for diesel in transport, power and agricultural sectors. One of the best alternatives is Biodiesels obtained from Vegetable oils. Due to the lower temperatures and pressures in the normal diesel engines, the burning of the vegetable oils is not complete, the low heating value and high viscosity of Biodiesels causes to reduce efficiency of the engine. The low heat rejection (LHR) diesel engine is only solution to overcome these problems. In the present work Investigations are carried out to evaluate the performance and emissions characteristics of a low heat rejection (LHR) diesel engine consisting of an air gap insulated piston with Cotton seed biodiesel. The air gap between the piston crown and piston skirt is varied from 1mm to 2.5mm to find best one at which the performance and emission characteristics are good. An increase in engine power, decrease in specific fu...

Import dependence for oil in India which is about 70 per cent is likely to increase further. The ... more Import dependence for oil in India which is about 70 per cent is likely to increase further. The study is initiated to investigate the potential of Karanja oil as a source of biodiesel. Biodiesel is an alternative fuel made from renewable biological resources such as vegetable oil and animal fat. It is completely biodegradable and non-toxic. Main objectives of the study are feasibility of Karanja oil for the production of biodiesel optimization of different parameters for high yield /conversion of Karanja oil to biodiesel. This survey presents the suitability of Pongamia Pinnata (karanja) as a source of renewable fuel substituting petrodiesel in CI engine. The fuel properties of esterified karanja oil and its blend with diesel fuel at different proportions are studied including engine tests. The straight karanja oil blend upto 25% with the petrodiesel meets the standard specification. However blending of this oil with petrodiesel upto 20% (by volume) can be used safely in a conventi...

African Journal of Biotechnology, 2007

Fermentation process for the production of itaconic acid was carried out using jatropha seed cake... more Fermentation process for the production of itaconic acid was carried out using jatropha seed cake. Itaconic acid is commercially produced by the cultivation of Aspergillus terreus with molasses. Jatropha seed cake is one of the best carbon sources among various carbohydrates, because it is pure, inexpensive and available in a mass supply. The reaction was carried out at various temperatures, agitations and pH. The samples were collected at 24 h time intervals. Itaconic acid concentration was measured by the rapid spectroscopic method. Jatropha seed cake shows maximum yield of 24.45g/l after 120 h.

Glass Fiber Reinforced Polymer (GFRP) composite materials are replacing traditional engineering m... more Glass Fiber Reinforced Polymer (GFRP) composite materials are replacing traditional engineering materials owing to their properties. In the present work, the mechanical constants Ex, Ey, vxy and Gxy of continuous fiber GFRP angle-ply lamina (specially orthotropic lamina) were determined for three different fiber volume fractions using finite element method. A finite element model incorporating the necessary boundary conditions was developed and is solved using the commercially available FEA (ANSYS 11.0) package. The response surface models for longitudinal Young’s modulus (Ex), transverse modulus (Ey), major Poisson’s ratio (xy), and in-plane shear modulus (Gxy) have been developed using the data obtained from ANSYS results. The adequacy of the developed model is verified by using coefficient of determination and Analysis of Variance (ANOVA) methods. The research showed acceptable prediction results for the response surface models. The results showed an average accuracy of 0.997 fo...

Glass fiber reinforced plastics are finding its increased applications in various engineering fie... more Glass fiber reinforced plastics are finding its increased applications in various engineering fields such as aerospace, automobile, electronics and other industries. This paper discusses the use of fuzzy logic for modeling turning parameters in turning of glass fiber reinforced plastics by carbide tool (K-20). Experiments were conducted based on the established Taguchi"s Design of Experiments (DOE) L25 orthogonal array on an all geared lathe. The cutting parameters considered were cutting speed, feed, depth of cut, and work piece (fiber orientation). Fuzzy based model is developed for correlating the cutting parameters with surface roughness (Ra). The results indicated that the model can be effectively used for predicting the surface roughness (Ra) in turning of GFRP composites.

SAE Technical Paper Series, 2013

... 29, pp. 119-129, 2004 Recep Altin, Selim Cetinkaya, and Huseyin Serdar Yucesu, The potentia... more ... 29, pp. 119-129, 2004 Recep Altin, Selim Cetinkaya, and Huseyin Serdar Yucesu, The potential of using vegetable oil fuels as fuel for diesel engines, International Journal of Energy Conversion and Management, 2000-42, 529-538. ...

International Journal of Engineering, Science and Technology, 2012

Glass fiber reinforced plastic (GFRP) composite materials are replacing traditional engineering m... more Glass fiber reinforced plastic (GFRP) composite materials are replacing traditional engineering materials owing to their superior properties. Accordingly, the need for accurate machining of composites has increased enormously. This paper deals with the study of power consumption in machining of GFRP composite tubes of different fiber orientation angle vary from 300 to 900. Machining studies were carried out on an all geared lathe using three different cutting tools: namely Carbide (K-20), Cubic Boron Nitride (CBN) and Poly-Crystalline Diamond (PCD). Experiments were conducted based on the established Taguchi’s Design of Experiments (DOE) L25 orthogonal array on an all geared lathe. The cutting parameters considered were cutting speed, feed, depth of cut, and work piece (fiber orientation). The data collected was statistically analyzed using Analysis of variance (ANOVA) technique, and a second order mathematical model in terms of cutting parameters was developed using Response surfac...

Fuel Processing Technology, 2010

ABSTRACT An experimental study of the performances and emissions of a diesel engine is carried ou... more ABSTRACT An experimental study of the performances and emissions of a diesel engine is carried out using two different biodiesels derived from Chinese pistache oil and jatropha oil compared with pure diesel. The results show that the diesel engine works well and the power outputs are stable running with the two selected biodiesels at different loads and speeds. The brake thermal efficiencies of the engine run by the biodiesels are comparable to that run by pure diesel, with some increases of fuel consumptions. It is found that the emissions are reduced to some extent when using the biodiesels. Carbon monoxide (CO) emissions are reduced when the engine run at engine high loads, so are the hydrocarbon (HC) emissions. Nitrogen oxides (NOx) emissions are also reduced at different engine loads. Smoke emissions from the engine fuelled by the biodiesels are lowered significantly than that fuelled by diesel. It is also found that the engine performance and emissions run by Chinese pistache are very similar to that run by jatropha biodiesel.

International Journal of …, 2011

During the last few years, natural fibers have received much more attention than ever before from... more During the last few years, natural fibers have received much more attention than ever before from the research community all over the world. These natural fibers offer a number of advantages over traditional synthetic fibers. The present study aims to determine the mechanical properties namely, Tensile strength (TS), Flexural strength (FS), and Impact strength (IS) of green coconut fiber reinforced HDPE polymer composite material. Experiments are planned to produce the test specimens according Taguchi's L 9 orthogonal arry concept. The control parameters considered were fiber volume fraction (V f) and fiber length (f l). An attempt has been made to model the mechanical properties through response surface methodology (RSM). Analysis of variance (ANOVA) is used to check the validity of the model. The results indicated that the developed models are suitable for prediction of mechanical properties of green coconut fiber reinforced HDPE composite.

CIRP Annals, 1988

This paper deals with the study of machinability of GFRP composite tubes of different fiber orien... more This paper deals with the study of machinability of GFRP composite tubes of different fiber orientation angle vary from 30 0 to 90 0. Machining studies were carried out on an all geared lathe using three different cutting tools: namely Carbide (K-20), Cubic Boron Nitride (CBN) and Poly-Crystalline Diamond (PCD). Experiments were conducted based on the established Taguchi's Design of Experiments (DOE) L 25 orthogonal array on an all geared lathe. The cutting parameters considered were cutting speed, feed, depth of cut, and work piece (fiber orientation). The performances of the cutting tools were evaluated by measuring surface roughness (Ra) and Cutting force (Fz). A second order mathematical model in terms of cutting parameters was developed using RSM. The results indicate that the developed model is suitable for prediction of surface roughness and Cutting force in machining of GFRP composites.

Applied Mechanics and Materials, 2013

Bio fuels based on vegetable oils offer the advantage being a sustainable, annually renewable sou... more Bio fuels based on vegetable oils offer the advantage being a sustainable, annually renewable source of automobile fuel. Despite years of improvement attempts, the key issue in using vegetable oil-based fuels is oxidation stability, stoichiometric point, bio-fuel composition, antioxidants on the degradation and much oxygen with comparing to diesel gas oil. Thus, the improvement of emissions exhausted from diesel engines fueled by biodiesel derived from palm oil is urgently required to meet the future stringent emission regulations. Purpose of this study is to explore how significant the effects of palm oil blending ratio on combustion process that strongly affects the vehicles performance and exhaust emissions. The engine speed was varied from 15003000 rpm, load test condition varied by Dynapack chassis dynamometer from 050% and palm oil blending ratio from 515vol% (B5B15). Increased blends of biodiesel ratio is found to enhance the combustion process, resulting in decreased the HC ...

International Journal of Engineering, Science and Technology, 2014

Glass fiber reinforced polymer composites are finding its increased applications in variety of en... more Glass fiber reinforced polymer composites are finding its increased applications in variety of engineering applications such as aerospace, automobile, electronics and other industries. However, the users of FRP are facing difficulties to machine it, because of fiber delamination, fiber pull out, short tool life, matrix debonding and formation of powder like chips. The present investigation focuses on the optimization of process parameters for surface roughness of glass fiber reinforced polymer (GFRP) composites using Genetic Algorithm (GA). Experiments are conducted based on the established Taguchi’s L25 orthogonal array in Design of Experiments (DOE) on an all-geared lathe using poly-crystalline diamond (PCD) tool. The process parameters considered were cutting speed, feed, depth of cut, and work piece (fiber orientation angle). A second order mathematical model was developed for surface roughness prediction using Response Surface Methodology (RSM). An attempt has also been made to...