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The pressure gain characteristics of jet pipe servovalve is required as an input to the designer for improving performance of the servovalve. An attempt has been made to design the first stage jet pipe servovalve parameters to get maximum pressure recovery. The static recovery pressure in receiving holes is a function of jet pipe nozzle displacement relative to receiver plate. The recovery pressure depends on web thickness, jet pipe nozzle diameter, receivers hole diameter, nozzle offset and nozzle stand-of distance. A detailed static recovery pressure analysis of a two stage, four-way, closed ports electrohydraulic flow control valve considering the effect of web thickness, nozzle diameter, receiver hole diameter and offset parameters are presented in the paper. Also the effect of supply pressure on recovery pressure is presented.

This paper presents the results of the simulation of a piston ring in a multibody single cylinder internal combustion engine using explicit Finite Element analysis. The Finite Element model comprises of an assembly of piston, top compression ring, liner, connecting rod and crankshaft. The ring geometry, its coating and coating methods, its mechanical and its thermal properties are factors which influence engine performance. Deformation in the ring, the stresses developed therein and ring-liner clearance have been determined. This approach to engine design reduces the conceptual design-to-development cycle time and reduces the need of extensive engine testing for evaluating ring performance. The information obtained from the analysis serves as input for ring design and for development of coating techniques.

Presently, two wheelers (scooters and motorcycles) use transmission gears produced from wrought material. The production process is expensive and involves significant wastage of material. A combination of finite element analysis and practical experiments have been carried out to produce PM gears (selective surface densification) which can be used for transmission application. Experimental details of this study will be discussed in this paper.