Dixit M.S.,Marathwada Institute of Technology
International Journal of Civil Engineering and Technology | Year: 2017
Soil being the cheapest and readily available construction material has been popular, even though it suffers from being poor in mechanical properties. It has been the constant endeavor of research workers to put forth innovative ideas to improve its mechanical properties to suit the requirements of engineering structures, Vidal in 1968 postulated the new oriented concept of reinforced earth technique. Reinforced earth is a construction material composed of soil fill, strengthened by inclusion of rods, bars, fibers or nets that interact with the soil by means of frictional resistance and act as a coherent mass. It is used in a variety of applications such as retaining structures, embankment, stabilization of subgrade and improvement of soil beneath pavements and footings. Fiber reinforcement technique permits use of natural as well as synthetic fibers for soil reinforcement. In Maharashtra black cotton soil is found in abundance which is highly expansive soil. In present study an attempt has been made to investigate the use of polypropylene fibers for improving properties of locally available soil. The comparison of properties of soil with addition of varying percentages of fibers by dry weight of soil and having different aspect ratios is also carried out. The addition of polypropylene fibers resulted in increase in optimum moisture content and decrease in maximum dry density. Direct shear tests conducted on soil shows increase in value of cohesion and decrease in value of angle of internal friction. With the inclusion of the fibers increase in C. B. R. value and unconfined compressive strength is observed. © IAEME Publication.
Saljoshi P.S.,Marathwada Institute of Technology |
Autee A.T.,Marathwada Institute of Technology
Heat and Mass Transfer/Waerme- und Stoffuebertragung | Year: 2017
Two-phase flow is the simplest case of multiphase flow in which two phases are present for a pure component. The mini channel is considered as diameter below 3.0–0.2 mm and conventional channel is considered diameter above 3.0 mm. An experiment was conducted to study the adiabatic two-phase flow patterns in the circular test section with inner diameter of 1.1, 1.63, 2.0, 2.43 and 3.0 mm for horizontal orientation using air and water as a fluid. Different types of flow patterns found in the experiment. The parameters that affect most of these patterns and their transitions are channel size, phase superficial velocities (air and liquid) and surface tension. The superficial velocity of liquid and gas ranges from 0.01 to 66.70 and 0.01 to 3 m/s respectively. Two-phase flow pattern photos were recorded using a high speed CMOS camera. In this experiment different flow patterns were identified for different tube diameters that confirm the diameter effect on flow patterns in two-phase flows. Stratified flow was not observed for tube diameters less than 3.0 mm. Similarly, wavy-annular flow pattern was not observed in 1.6 and 1.0 mm diameter tubes due to the surface-tension effect and decrease in tube diameter. Buoyancy effects were clearly visible in 2.43 and 3.0 mm diameter tubes flow pattern. It has also observed that as the test-section diameter decreases the transition lines shift towards the higher gas and liquid velocity. However, the result of flow pattern lines in the present study has good agreement with the some of the existing flow patterns maps. © 2017 Springer-Verlag Berlin Heidelberg
Panchal B.M.,Dr. Babasaheb Ambedkar Marathwada University |
Dhoot S.B.,Nurture Earth Research and Development Pvt. Ltd. |
Deshmukh S.A.,Nurture Earth Research and Development Pvt. Ltd. |
Sharma M.R.,Marathwada Institute of Technology |
Kachole M.S.,Dr. Babasaheb Ambedkar Marathwada University
Fuel | Year: 2013
The transesterification of Pongamia pinnata seed oil with dimethyl carbonate (DMC) for preparing DMC-BioD has been studied at the catalysis of potassium hydroxide (KOH). The effects of reaction conditions (ratio of P. pinnata seed oil and DMC, catalyst amount and reaction time, reaction temperature and agitation speed) on DMC-BioD yield were investigated. The highest DMC-BioD yield could reach 96% at refluxing temperat ure for 6 h with ratio of P. pinnata oil to DMC 1:3 w/w and 4% KOH (based on oil weight). Percentage of conversion has been analyzed by Gas Chromatography. P. pinnata seed oil DMC-BioD produced is characterized for the properties such as the kinematic viscosity at 40°C, density at 25°C, flash point (FP), pour point (PP), cloud point (CP), acid value and copper strip corrosion. P. pinnata seed oil DMC-BioD produced met with the quality standards defined under ASTM D675-02. © 2013 Elsevier Ltd. All rights reserved.
Gogte C.L.,Marathwada Institute of Technology |
Peshwe D.R.,Visvesvaraya National Institute of Technology |
Paretkar R.K.,Visvesvaraya National Institute of Technology
AIP Conference Proceedings | Year: 2012
The presence of cobalt in high speed steels is of great interest to researchers and the users as well. Although cobalt bearing high speed steels are used on commercial basis, the influence of cobalt in cryogenically treated high speed steels is still under scanner. Some researchers have found the effect of cobalt as negative, as it adversely affects the wear properties and fracture toughness of some high speed steels under certain conditions. This paper takes a review of influence of cobalt in tool steels with the past research and discusses the experimental results of the effect of cryogenic treatment on 10%Co bearing AISI T42 high speed steel. It has been found that this steel has an advantage due to the presence of Cobalt with respect to wear characteristics after the cryogenic treatment. It is also found that the cycle time of cryogenic processing of this super high speed steel shortens due to the presence of cobalt. © 2012 American Institute of Physics.
Patil N.G.,Marathwada Institute of Technology |
Brahmankar P.K.,Dr. Babasaheb Ambedkar Technological University
Procedia CIRP | Year: 2016
Most of efforts to model WEDM process have been made in the past. Earlier studies have been undertaken on monolithic materials such as steels. However, very few studies have been undertaken to model this process in machining of metal matrix composites. Although, significant number of publications is available on modeling of WEDM in machining of MMCs, most of the models are empirical. Moreover, earlier studies failed to incorporate the effects of constituents (ceramic particles and metal matrix) on the process behavior. In view of this, the objective of this study was to develop model for surface finish (Ra) based on machining process parameters, material properties, volume fraction and average ceramic particle size. The volume fraction and size of the particulates not only alters the thermal and physical properties of the resulting composites but also affects the process behaviour and machined surface morphology separately. Therefore it was decided to include the size of particles and the volume fraction to develop a new model for surface finish, Ra. The findings of this study lead to greater insights about material removal during machining of these difficult to machine materials using WEDM. Predictions of this model have found to be in close agreement with experimental results. The results of nonlinear estimation show that the properties such as heat of fusion, coefficient of thermal expansion, thermal diffusivity and melting temperature are most significant properties in machining of these composites. The role of ceramic particle has been highlighted with greater insight into the process and surface characteristics of these materials. © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
Patil N.G.,Marathwada Institute of Technology |
Brahmankar P.K.,Dr. Babasaheb Ambedkar Technological University |
Thakur D.G.,Indian Defence Institute of Advanced Technology
Procedia CIRP | Year: 2016
In this paper, effect of type of wire electrode material and volume fraction of reinforcement on wire electrical discharge machining performance of A359/SiCp composite has been reported. In this study, a plain brass (CuZn37) wire and a copper wire coated with CuZn50 were used as wire electrodes. The volume fraction of the SiC particulate reinforcement was varied from 10% to 30%. While volume fraction was found to be the most significant parameter affecting the cutting rate, the pulse on-time and the type of electrode material were the next in the order of significance. It is interesting to note that the interaction between on-time and volume fraction as well as the interaction between type of electrode material and pulse on-time also had significant influence on the cutting rate. Further, it was found that the cutting rate was greater in the case of coated wire as compared to the plain brass wire. The improvement in the cutting rate was found to be in greater than 58% for the coated wire. Furthermore, the kerf width was found to be smaller in the case of coated wire compared to the plain brass wire. Nevertheless, the surface roughness was found to increase significantly with the coated wire. © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
Lakhekar G.V.,H+ Technology |
Saundarmal V.D.,Marathwada Institute of Technology
IEEE International Conference on Fuzzy Systems | Year: 2013
This paper presents a novel approach to the design of an adaptive fuzzy sliding mode controller for depth control of an autonomous underwater vehicle (AUV). So far, AUV's dynamics are highly nonlinear and the hydrodynamic coefficients of the vehicles are difficult to estimate, because of the variations of these coefficients with different operating conditions. These kinds of difficulties cause modeling inaccuracies of AUV's dynamics. So that, an adaptive fuzzy sliding mode control with novel fuzzy adaptation technique is proposed for regulating vertical positioning in presence of parametric uncertainty and disturbances. In this approach, two fuzzy approximator are employed in such a way that slope of the linear sliding surface is updated by first fuzzy approximator, to shape tracking error dynamics in the sliding regime, while second fuzzy approximator change the supports of the output fuzzy membership function in the defuzzification inference module of fuzzy sliding mode control (FSMC) algorithm. Simulation results shows that, the reaching time and tracking error in the approaching phase can be significantly reduced with chattering problem can also be eliminated. The effectiveness of proposed control strategy and its advantages are indicated in comparison with conventional sliding mode control and FSMC technique. © 2013 IEEE.
Kate P.G.,Marathwada Institute of Technology |
Rana J.R.,Jawaharlal Nehru Technological University Anantapur
International Conference on Energy Systems and Applications, ICESA 2015 | Year: 2015
Now-A-days electricity meter reading and billing is conducted manually by door-To-door system. This system, as observed requires a large amount of man power and is also the time & energy consumption. To overcome the limitations of this traditional system, proposal of a prototype module which includes advanced wireless technology called ZIGBEE. The proposed module helps to reduce the time delay, errors and theft of electricity. The ZigBee is preferred over other wireless technologies because it works in unlicensed frequency band, it does not requires high speed data rate, also this device is low powered and low cost. The microcontroller based system continuously monitors the reading and theft detection that can be seen on the Liquid Crystal Display (LCD) display. © 2015 IEEE.
Dholi P.R.,Marathwada Institute of Technology |
Chaudhari K.P.,Marathwada Institute of Technology
Communications in Computer and Information Science | Year: 2013
Biometric authentication is individual characteristics that cannot be used by imposter to penetrate secure system. Keystroke dynamics based authentication verifies user from their typing pattern. To authenticate user based on their typing samples, it is required to find out he resemblance of a typing samples of user regardless of the text typed. Key event timing is extracted from key features Latency, Dwell time, Key interval, Up to up, Flight time and standard are measure in the form of FAR, FRR and ER. In this paper we introduces a k-nearest neighbor approach to classify users' keystroke dynamics profiles. For authentication, an input will be checked against the profiles within the cluster which has significantly reduced the verification load. © 2013 Springer-Verlag.
Patel V.V.,Marathwada Institute of Technology |
Patil R.N.,Marathwada Institute of Technology
International Conference on Communication and Signal Processing, ICCSP 2013 - Proceedings | Year: 2013
In 4G wireless communication systems, bandwidth is a precious commodity, and service providers are continuously met with the challenge of accommodating more users with in a limited allocated bandwidth. To increase data rate of wireless medium with higher performance, OFDM (orthogonal frequency division multiplexing) is used. The idea of OFDM is to split the total transmission bandwidth into a number of orthogonal subcarriers in order to transmit the symbols using these subcarriers in parallel. The main disadvantage of using OFDM system is high PAPR. Many methods had implemented for reducing PAPR. In this paper we use IDWT/DWT instead of IFFT/FFT and for more reduction we combine, Iterative clipping and filtering method with Huffman Coding that reduces PAPR about 13db. © 2013 IEEE.