Research
Predictive Model of Orthotropic Un-Symmetric box Cam Based on Deflection andCountered by Segments of Circular-Arc Contact Profiles
In this paper the principal objective is to find the deflection of orthotropic box cam profile countered by segments of circular-arc due to the effect of contact loading which produce the generate force that induces high contact stress on the cam-surface especially in high-speed machine. In highspeed it can be used the composite cam, since it affects the whole machine performance to improve the wear resistance. Several researchers investigated the effects of cam profile in accuracy and system flexibility on the output motion experimentally; but there is a lake in the theoretical part. The theoretical part has been done with the solution of orthotropic circular plate equation using the harmonic deflection motion of the follower. The cam used in this paper can be seen in composite shifter cam for a motorcycle transmission, composite hollow cam-shafts, the running valve lift with roller followers of a composite camshaft, and heavy duty of marine engine. The aim of the present paper is to find the maximum deflection of orthotropic box cam on the boundaries of the three circular-arc contact profiles for flanks and noses of contact follower loadings. The results were arrangement into theoretical part and finite element using software ANSYS 12.1.
A Combined Effect of Elasto-Plasto Hydrodynamic Lubrication in Cold Strip Rolling
The aim of this study is to analysis the behavior of lubricants in cold strip rolling. An elastohydrodynamic lubrication analysis which takes account of elastic deformation of the roller while the metal strip deform plastically ,so that a relation between the E.H.L and plastohydrodynamic is used to determine the lubricant film thickness which will entrained in metal rolling operation .The viscosity variation and the variation between the pressure gradient and the speed of the roller with lubricant which is Newtonian up to some critical shear stress and thereafter behaves plastically is derived.The results are compared with the experimental one ,which shows good agreement with it.
A study of the effect of surface defect caused by impact load from shock wave on wing design in transonic speeds using classical plate theory
In this research the aerodynamic load have been determined in critical transonic speeds taking into consideration the shock wave effect along X-29 aircraft wing , first by using computational fluid dynamics in fluent program, then taking these results as an applied loads in the classical plate theory (c.p.t) to estimate these stresses depending on time and speeds of impact load as a major parameter, and a numerical method using F.E.M (Ansys 10 ) for confirming the results that obtained from analytical solution. Results shows that the value of pressure coefficient along the wing using (c.p.t) is higher then the experimental one which is more save in design for transonic flow and its appeared that the position of maximum effect of shock wave on wing section depends on angle of attack , sweep angle and duration time of the shock wave load .
