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Non conventional power devices viz. Photo voltaic cells are not seeing much of light due to a practical draw back that sun should be normal to the plane of the device all the times. But presently non conventional power devices are being installed in a fixed position and in a day, position of sun keeps changes from morning till evening with relative to the non conventional power device. Because of this practical difficulty most of the time very minimal power that emits from the sun will be utilized for generating electricity. To overcome this limitation a trailer system is needed which enables the non conventional power device to change its orientation (Rotates) continuously such that it always remains normal to the sun with which effectiveness of the non conventional power devices can be increased tremendously. Existing systems are having electronic controllers which are complex to handle and also costlier. Moreover they demand more power for their own controller and also their maintenance is tedious. Hence a trailer system which dispenses utility of so called complex electronic controller through the aid of mechanical elements is evolved for non conventional power applications. To start with all the subsystems of the proposed configuration are identified and sizing is evolved through design calculations. Further design adequacy has been assessed through Finite Element Analysis.

This paper highlights a surface modification technique to evaluate the mechanical properties like hardness and sliding wear resistance of cast Iron surface used in engineering. Basic sand casting mold was used and a portion of it was designed to accommodate the external mild steel chill (MSC). Chill accelerates the cooling rate of molten metal which leads to directional solidification. Cooling rate is directly proportional to formation of carbides in the form of iron carbide (Fe 3 C) near the chill end By controlling the flow of liquid nitrogen, the temperature of chills was reduced (upto -100 °C). Effect of using chills on mechanical properties like hardness and sliding wear resistance was evaluated and analyzed. The present work provides the effective chilling thickness, which gives higher hardness near the chilled surface and a fairly appreciable hardness conducive for a specific wear functional requirement. The mechanical properties of chilled cast iron (CCI) is compared with sub zero chilled cast iron (SZCCI) and normal cast iron without using chill. The present results clearly demonstrates that chilled cast iron has superior sliding wear resistance at the chilled surface, good machinibility away from the chilled end.

Comfort travel is order of the day for any automotives in spite of the road conditions. Suspension system holds whole and sole responsibility of providing comfort to the occupants. Intensity of the disturbance originated from road varies with its condition ranging from minimum in case of normal road (Moderately rough) to maximum in case of pot hole or speed breaker. Accordingly stiffness of the suspension system needs to vary which is not so with today's configuration. To provide solution to this problem a hybrid design has been evolved which will have provision for change over option between two springs with different stiffness values. To start with all the subsystems of the proposed design are identified and sizing of each is evolved through design. Further design adequacy has been assessed through Finite Element Analysis. Keywords: Suspension system, Hybrid system, Stiffness, Cyclic motion, Automobile, Shock loads.