Abstract

Mathematics serves as a tool in technical understanding every branch of Engineering Education. The interest in learning engineering mathematics is slowly deteriorating in engineering colleges all over. By identifying the areas of difficulty in learning and motivating the students in creating interest in learning the subject and improving the quality of teaching materials will optimize the performance of the students in engineering mathematics, which is affected by various factors. E- learning can be used as a tool in minimizing these multi-various obstacles and to build up better learning of Mathematics skills in engineering education.

Abstract

Developed as a simple and cost-effective wireless technology for reliable and portable services, IEEE802.11 has gained popularity at an unprecedented rate. However, due to lack of built in quality service support IEEE802.11experiences serious challenges in meeting multimedia and other services and applications. This paper discusses the IEEE802.11 quality of services with enhanced MAC layer. The IEEE802.11 for the WLAN standard focuses on the MAC and Physical layers for AP based networks and ad-hoc networks. The original standard supported three PHY standards: IR, FHSS and DSSS. Here the medium, access scheme which is called EDCF, and is adopted in an upcoming standard IEEE802.11e to allow medium access for applications with Qos requirements and is analyzed, described & discussed and its performance is also calculated with the help of OPNET simulator.

Abstract

Presently, Engineering institutions are operating in a global marketplace, wherein; the corporate work culture and human resource requirement are frequently changing. Engineering education drives innovations & technological progress, which contributes to economic development of the nation. Therefore, the quality of engineering education is becoming more important, where the output of the system have direct impact on the quality of their employer organizations. High quality education system can produce high quality human capital. Most of the educational institutions specifically in USA & UK are using TQM philosophy for quality assurance and thereby ensuring satisfaction of stakeholders. However, a globally acceptable standard model of TQM is not seen. Therefore, an attempt has been made in this paper to analyze Indian engineering education system by using system approach through identification of its stakeholders, input, output, processes, resources and management. As system approach is primarily based on principle of wholeness, the model developed herewith will have great significance in Indian engineering education system.

Abstract

The ability of a program or an operating system process to manage its use by multiple users and to even manage multiple requests by the same user without having to have multiple copies of the programming running in the computer. Intel's recently introduced Hyper-Threading Technology promises to increase application- and system-level performance through increased utilization of processor resources. It achieves this goal by allowing the processor to simultaneously maintain the context of multiple instruction streams and execute multiple instruction streams or threads. These multiple streams afford the processor added flexibility in internal scheduling, lowering the impact of external data latency, raising utilization of internal resources, and increasing overall performance. In this paper an application program is written with and without threads and checked in different operating sytems like LINUX, Windows. Finally, the CPU time is compared between the single processor and hyperthreaded processor, and also when a number of processor is increased, the performance of the processor is also increased which is shown.

Abstract

We propose a new algorithm to solve the minimum span frequency assignment problem in cellular networks. The algorithm is based on the ant colony optimization approach in which several ants generate complete solutions simultaneously. In this algorithm, a complete tour is constructed by ants by visiting each cell in the system exactly once.

Abstract

In this paper the lateral stability of a rail vehicle is analysed using multibody dynamics. The linear mathematical modeling of railway vehicle was developed with 17 Degrees-Of-Freedom (DOF) system which considers lateral displacement, vertical displacement, roll angle and yaw angle etc. The second order differential equations of motions are derived for a car body with conventional wheel set. Then the second order differential equations of motions are transformed in to a standard Eigen values problem using state space approach. By solving the equation, the Eigen values and Eigen vectors are obtained. From the Eigen values the stability of the vehicle has been analysed. The influences of certain physical parameters like Wheel radius, Rail gauge, Axie load, suspension stiffness with conicity angle on the critical hunting speed was analysed. Over all, rail vehicle stability analysis carried out in this work has been found to be quite satisfactory and comparable with the standard available results.

Abstract

The fundamental goal of any suspension system is the isolation of a structure from external excitation. In the case of a vehicle, a classical car suspension aims to achieve isolation from the road by means of a spring type element and a viscous damper. The characteristics of the elements of the suspension are chosen according to comfort, road holding and handling specifications. A suspension unit should be able to reduce chassis acceleration as well as dynamic tyre force within the constraints of a set working space and with minimal energy consumption.

The design of an automotive suspension has been a compromise between the three conflicting parameters of road handling, load carrying and passenger comfort. The passenger comfort is given more importance in suspension design. For the past three decades, the introduction of increasingly sophisticated electronically controlled components into automotive suspension, give better comfort.
In this paper, an experimental setup of quarter car model to study the performance improvement of active suspension system has been explained. The road disturbance was created by a cam. The electronic control unit receives the information from the displacement sensor mounted on the sprung mass. Based on the input data, the control law was applied to counteract the road disturbance. The sprung mass displacement is controlled by a hydraulic actuator which is controlled by the spool movement of proportional control valve based on the control law.

A mathematical modeling of a typical vehicle has been developed by considering the sprung mass and unsprung mass. Second order differential equations of motion are derived for quarter car model and forced quarter car model with damping. Then the second order differential equations of motion are transformed into a standard eigen value problem. Then it is solved by using MATLAB. The dynamic study of the behavior of a quarter vehicle and the performance improvement of the proposed concept are carried out using the simulation results obtained from the mathematical modeling.

Abstract

Nowadays combined cycle (CC) power plants become a good choice to produce energy, because of their high efficiency and the use of low carbon content fuels (e.g. natural gas) that reduces the greenhouse gases production. Combined Cycle plants couple a Brayton cycle with a Rankine cycle. The equipment where the steam production takes place is named the heat recovery steam generator (HRSG). For the combined power plants, the optimization of the heat recovery steam generator (HRSG) is of particular interest in order to improve the efficiency of the heat recovery from turbine exhaust gas to maximize the power production in the steam cycle. The aim of the present paper is to out line the HRSG design and optimize the heat recovery steam generator in combined cycle power plant. In heat recovery steam generator the optimization is done on steam side i.e. optimum pressure of steam. The optimum intermediate pressure increases with maximum steam pressure. The effect of pinch point on the mass flow rate of steam is also calculated. It is found that as the low pressure pinch point increases the stack temperature also increases.

Abstract

It introduces a new nonlinear Fuzzy Filter for image processing in a mixed noise environment, where both additive Gaussian noise and non-additive impulsive noise may be present. Averaging filters can effectively remove the Gaussian noise and order statistics Filter or median Filters can effectively remove the impulsive noise. However it is difficult to combine these Filters to remove mixed noise is an image processing  environment without blurring the image details or edges. Trying to distinguish between noise and edge information in the image is an inherently ambiguous problem and naturally leads to the development of a Fuzzy Filter. The application of fuzzy techniques in image processing is promising research field. Fuzzy techniques have already been applied in several domains of image processing (like filtering, interpolation, and morphology) we compared our simulations with results obtained by filtering with a Median filter, Adaptive Nonlinear  Multivariate (ANM) Filter and Multilevel Adaptive Fuzzy filter. Our filter gave significantly better results in all cases.

Abstract

Surface roughness plays an important role in manufacturing and the product quality depends on the surface roughness. The present work focuses on developing a multiple regression model with intercepts for the prediction of surface roughness in milling. The working parameters, viz. speed, feed and depth of cut are considered in this model. The experiments were conducted based on factorial design in Design of Experiments (DOE). The values surface roughness predicted by this model are then verified with additional experiments and compared. Experimental results and statistical tests demonstrate that the model developed in this work predicts the surface roughness values with good accuracy.

Abstract

Knowledge of the flow phenomena inside the cylinder is necessary for optimum design of the intake port and the piston cavity configurations. Recent trends in direct injection diesel engines have increased the need for clear understanding of the flow field, especially the swirl characteristics. The swirl flow is an essential parameter which affect the air fuel mixing, combustion efficiency and therefore the engine performance. The purpose of this study is to investigate the combustion, emission, spray and flow field phenomena of D I diesel engine is to come up with the geometrical shape of a port and valve or valves that produce the optimum swirl ratio. The variation of steady state swirl with valve lift for the helical port of a DI diesel engine are simulated and studied using Computational Fluid Dynamics with experimental validation.

Steady flow rig experiments are most widely used to evaluate the swirl ratio of an intake port design. The three dimensional developing flow patterns may be needed throughout the compression and combustion stroke to understand the various experimental results. Flow is simulated by solving governing equations, viz., conservation of mass and momentum using the simple - algorithm. Turbulence has been modeled by standard k model with standard wall treatment. The predictive accuracy of the calculation method is compared with detailed mass flow rate and paddle rpm measurements. The results are in good agreement with experimental results and clearly predict the under predictability of the paddle swirl meter in lower lifts.

Emission standards, which demand large reduction in NO and PM emission, require a more comprehensive study of all x elements that contribute to emission formulation. The combustion chamber is subject of research and development in a effort to achieve optimized combustion system. In particular, intake port fluid dynamics contribute to the fuel air mixing which in turn is the most important parameter for the control of fuel burning rate for diesel engines. The intake port fluid dynamics also significantly affects ignition delay, the magnitude and timing of the diffusion burn, the magnitude of the premixed burn and Emission of nitrous oxide and soot. In this study, the numerical simulation of the helical intake port for two-valve DI Diesel engines is discussed with experimental validation. The improvement of the design according to the stringent emission norms and the variation of swirl generation capacity of the port are also studied.

Abstract

This paper describes about the investigation undertaken to examine the suitability of recycled concrete as a substitute for fine aggregate. Recycled concrete (artificial sand) is used for 40% of fine aggregate and natural sand is retained for the remaining part. HPC of M60 grade is attempted, with different replacement levels of cement with Fumed Silica. Maximum 28-day compressive strength of 68.26MPa with 1.0 percent replacement of Cement with Fumed Silica was observed for a water-binder ratio of 0.33. Acid resistance and Chloride impermeability increases with increase of Fumed Silica content. Tests on sorptivity, saturated water absorption, coefficient of water absorption and porosity were also conducted.