Mechanical Engineering

Abstract In this work, effect of water depth on the single basin and double slope glass active solar still was studied. A solar collector is connected with solar still to convert the passive still into active. The set up was fabricated from a transparent glass .The thickness of the side glasses and bottom glasses are 8 mm and the upper slope glasses are 3.5 mm. All sides are made with same material. The bottom surface was coated with black coating. The solar still was insulated so that the heat dissipation could not take place to the surrounding. The length of the still is 1m and width is 0.5 m and depth of 10 cm was given and at this depth a slope of 150 was given. A flat plate solar collector is also added which is fabricated through Galvanised iron sheet whose thickness was 2.5 mm. It is in rectangular shape whose dimensions are (30cm x 15cm x 10cm). A copper tube is circulated with snake shape through which water is circulated. The study covers the influence of water depth of 1cm, 2cm and 3 cm with and without coal in the still productivity. The results stated that distilled water collection is highest for lower depth of 1 cm with and without coal. Even among lower depth, water with coal observed 21.9% increases in productivity in comparison with without coal.

Reliability assessment popularly known as Weibull analysis is an exercise primarily concerned with reliability estimation and prediction with which failure process of a system can better be analyzed. Many situations like modeling failure processes, decision of effective maintenance policy, estimation of maintenance float factors, downtime assessment and reduction greatly rely on the parameters of the life distributions fitted to the failure data. As the Weibull distribution involves transcendental equation, determining parameters is quite difficult task. To this effect, a Nomograph is developed and presented in this paper to closely determine the Weibull parameters. The paper articulates the development of Nomograph and procedure for its implementation. Results and discussions carried out proves statistically that the results obtained using the Nomograph are better than the commonly used its counterparts.

This is the study to evaluate the performance of new design of biogas unit and to enhance the biogas production by using different parameters. The raw material to be fed in digester will be the food waste which gets generated everyday from restaurant full of crowd in the locality. With this unit, biogas equivalent to two kg of LPG can be generated from the feeding of approximately 15 kg of food waste every day. This is the only design available which allows the user to choose how much biogas pressure he wants. Biogas thus produced can be checked for quality by different inoculums and additives. Thus the cost of disposing the food waste can be saved and the energy can also be recreated and reutilized for restaurant benefits. Hence the atmospheric contamination automatically gets prevented.

The combination of Casting and Powder Metallurgy can promote refined and more uniform microstructures which can result in improved properties and higher isotropy of material. The potential of such blending can be studied by using three important processes viz. Osprey Process, Ceracon Process and Slip Casting Process. These processes can be compared on the basis of microstructure, Austenitizing temperature, and Hardness with Scanning electron microscopy and can be related with conventional processes of manufacturing.

This study is to find out the best optimum ratio of the mixed waste materials of high-density polyethylene and wood’s flour by comparing the mechanical properties of recycled product (WPC). In this study, the fabrication process of wood plastic composite (WPC) contained of virgin material, post-consumer high-density polyethylene, and wood’s flour is through a twin-screw extruder and hot compression machine. The WPC product with four different ratio filler content based on weight percentage, i.e. 0 wt %, 20 wt %, 30 wt % and 40 wt % , were tested using universal tensile machine and impact tester according to ASTM D 3039, ASTM D 790, and ASTM D 6110 . The results of experiment showed that tensile and flexural properties of the composite increased with the adding of the wood’s flour material. The testing showed, however, totally opposite to the result of the impact test. In overall, the results of observations showed that recycled WPC have better mechanical properties compared to non-recycled WPC.

Investigation of the sandwich structures under bending has an important role to understanding the composite structures stability. Bending behavior of sandwich structures has a wide range of applications in science, engineering and technology. In this study the effects of core shape, cell wall height, wall thickness and skin thickness on critical bending load of honeycomb sandwich panels have been investigated. The other parameters of sandwich panel supposed constant during all analyses. The finite element simulation has been carried out with using of ABAQUS software and results were compared with experimental results. After that design of experiment based on Taguchi method has been carried out for understanding the effect of investigated parameters on maximizing the critical bending load. Eventually, the effect of parameters has been investigated with using of ANOVA.

The optimization of computer numerical control(CNC) boring operation parameters for aluminum alloy 6063 T6 using Taguchi and Grey Relational Analysis(GRA) optimization technique. Machining industry is playing a crucial role in the present manufacturing scenario and boring is an operation which is quite highly used nowadays to enlarge and achieve greater accuracy of the internal holes. In the present work an attempt is made to select the combination of optimum cutting parameters which results in better surface finish (minimum surface roughness i.e. Ra and Rq) and Circularity (Cr). Machining with optimum cutting parameters will result in minimum machining time and enhance the productivity. Three parameters viz. cutting speed, feed and depth of cut of boring bar has been taken as control factors. The cutting trials are performed as per Taguchi L27(3^3) orthogonal method to deal with the response from multi-variables. Taguchi orthogonal array is designed with three levels of boring parameters with the help of software Minitab 16. Grey Relational Analysis is performed for finding out the optimal parameter setting for the Al alloy 6063 T6 material. Additionally, for analyzing the data, the analysis of variance (ANOVA) technique is used to find the significant factors and their individual contribution in the response function i.e. surface roughness and Circularity.

Energy represent requirement of human being base, what increasing in line with its life storey;level. Oil fuel / fossil energy represent one of the source energy having the character of do not newly ( non sources energy renewable) which during the time representing pledge to fulfill requirement of energy in all activity sector. Properties of resource of energy in Indonesia, that is Hydropower, hot earth, earth gas, coal, peat, biomassa, biogas, wind, sea energy, sun and other can be exploited as alternative energy, replacing depended to oil fuel, what limited progressively goodness sum up and its reserve. Oil fuel hold very dominant position in accomplishment requirement of energy in country. Have to realize in this time Indonesia have imported crude oil and also oil fuel to ful fill requirement. crisis of Energy which knock over world affect, world crude oil price height, having an effect on direct to activity of economics. Properties of resource energy, specially the source of new and new energy which we have, require to difikirkan to be exploited as alternative energy, replacing and lessening role of oil fuel in consumption of energi in Indonesia. On that pattern, Body Research and Development of University of wijaya Putra doing research with activity of Analysis Exploiting Of Resource of Energy Alternative Is Ready of Energy Society in Indonesia, upon which policy of management of exploiting of resource of energy existing. Renewable energy To support BBM subtitute.

The present investigation deals with the static analysis of adhesively bonded triple stepped lap joint in laminated FRP composites using three-dimensional theory of elasticity based finite element method. The finite element model is validated with the available results in the literature for the longitudinal loading of a triple stepped lap joint made of isotropic materials and is extended for the analysis of a triple stepped lap joint made of generally orthotropic laminates subjected to longitudinal loads. Maximum stresses in FRP adherends and Adhesive are computed and the effect of fiber angle on these stresses is studied. The results of the present analysis reveals that the three-dimensional stress analysis is required for the analysis of triple stepped lap joint in laminated FRP composites.

The aim of this paper is to design and analyse a biconvex aerofoil with slightly curved leading edge and estimating the coefficient of pressure (CP), coefficient of lift (CL) and coefficient of drag (CD) at supersonic and hypersonic speeds. The aerofoil is symmetric and has a thickness of 6%. Gambit and Ansys Fluent are two best CFD software used for the analysis. The aerofoil was designed and meshed using Gambit software. Good quality boundary layer mesh can be easily generated using Gambit. The mesh generated was analyzed using Ansys Fluent software. About 1000 iterations were used for the simulation purpose. The pressure coefficient, lift coefficient and drag coefficient for the designed aerofoil were obtained. It was proven that the biconvex aerofoil can also be used for hypersonic speeds.