|1 Performance evaluation of Magnetic circuit for M.R. Fluid Damper using F.E.M, Md. Sadak Ali Khan , A.Suresh, N.Seetha Ramaiah
The primary purpose of this study is to evaluate and understand the performance of the Magnetic -Rheological (MR) damper. It is known that its performance depends upon the magnetic and hydraulic circuit design. These dampers are generally used to control the vibrations in various applications. This work deals with design of an MR damper for which mathematical model is developed. A finite element model is built to analyze and investigate the performance of 2-D axi-symmetric MR damper. Various configurations of damper piston with different number of turns and pole lengths are simulated. Further, the piston ends of the selected configuration are modified and investigated. The input current to the coil and the piston velocity are varied to evaluate the resulting change in magnetic Field Intensity (H) and damping Force. The simulation results of the various configurations of damper show that the performance of filleted piston ends is superior to that of other configurations for the same magnitude of coil current and piston velocity.
|2 Bifurcation Analysis of High-Speed Railway Vehicle in a Curve, M. Ranjbar, M. R. Ghazavi
In order to prevent unpleasant incidents, preservation high-speed railway vehicle stability has vital importance. For this purpose, railway vehicle is modeled using a 38-DOF. This paper presents an investigation on limit cycle and bifurcation of high speed railway behavior. It is revealed that the critical hunting speed decreases by increasing the wheel conicity. Also the critical hunting speed and hunting frequency calculated via the linear elastic rail is higher than that derived using a nonlinear model.
|3 Performance, Combustion and Emission Evaluation of Fish and Corn Oil as substitute fuel in Direct Injection C. I. Engine, D. K. Ramesha, Prithvish M Gowda, Manjunath N, Rajiv Simhasan, Rajiv K. T
The indiscriminate usage of fossil fuels in many countries has led to an increased interest in the search for suitable alternative fuels. Methyl Esters of Vegetable oils and Animal fats are found to be good alternative, renewable and environmental friendly fuels for C.I. engines. This paper presents the results of investigation carried out in studying the properties and behavior of methyl esters of corn seed oil, fish oil and its blends with diesel fuel in a C I Engine. Engine tests have been carried out to determine the performance, emission and combustion characteristics of the above mentioned fuels. The tests have been carried out in a 4-stroke, computerized, single cylinder, constant speed, direct injection diesel engine at different loads. The loads were varied from 0% to 100% of the maximum load in steps of 25%. The Methyl Ester blends of 10%, 20% and 30% by volume with diesel were used. The engine test parameters were recorded with the help of engine analysis software and were studied with the help of graphs. The results showed that the properties of the above mentioned oils are comparable with conventional diesel. The 20% blend performed well in running a diesel engine at a constant speed of 1500 rpm. It substantially reduced the emissions with acceptable efficiency. Hence the oils can be used as suitable additives for diesel in compression ignition engine.