Ahmad W. Yacout

Alexandria University | AU · Department of Mechanical Engineering

Because of their self-alignment property and design simplicity, the spherical hydrostatic bearings have the advantage over the other bearing configurations. Their static and dynamic performances have been intensively studied. Focusing on the bearing dynamic performance, it could be realized that the researchers used to mechanically excite the beari...

The Kugel fountain, where a sphere sits in a fitted socket fed by a thin film of pressurized water flowing between the sphere and the socket, was treated as a bearing without referring to any mathematical or practical evidence that can support this idea. Hence, in this study the hydrodynamics of this sculpture will be handled to support the idea of...

Analytical solutions are not available for the partial hemispherical hydrosphere which called as the Kugel ball fountain or the Kugel ball. However, this study offers a comprehensive idea about this phenomenon presenting a design map that gives a panoramic sight enabling the designers to easily choose whatever specifications needed for their founta...

Analytical solutions are not available for the partial hemispherical hydrosphere which called as the Kugel ball fountain or the Kugel ball. However, this study offers a comprehensive idea about this phenomenon presenting a design map that gives a panoramic sight enabling the designers to easily choose whatever specifications needed for their founta...

In a previous study handling this subject, a series of six papers has been published covering the fitted type (equal radii of this sort of bearings) with its configurations in details. The present study handles the same subject investigating the clearance type of this sort of bearings starting with the un-recessed one. The clearance type of bearing...

In a previous study handling this subject, a series of six papers has been published covering the fitted type (equal radii of this sort of bearings) with its configurations in details. The present study handles the same subject investigating the clearance type of this sort of bearings starting with the un-recessed one. The clearance type of bearing...

This is the last part of the series studying the fitted hydrostatic thrust spherical bearing. It handles an unconventional design of this type of bearings. The conception of this design is to break the rules controlling the bearing restrictions, where it is believed that without restrictors no hydrostatic bearing could be got (axiom). The paper foc...

The hydrostatic bearings are broadly observed in industrial applications owing to their potential characteristics of low running friction, high load-carrying capacity, high stiffness and small viscous dissipation. Spherical bearings have advantages over other configurations of bearings because of their self-aligning property and also their capacity...

The study deals with the fluid viscosity variation, the centripetal inertia and the bearing surface roughness affecting the externally pressurized thrust spherical bearing performance where the partial differential equation of the temperature gradient previously derived from the fluid governing equations, is integrated and applied to this type of b...

Abstract: The study deals with the fluid viscosity variation, the centripetal inertia and the bearing surface roughness affecting the externally pressurized thrust spherical bearing performance where the partial differential equation of the temperature gradient previously derived from the fluid governing equations, is integrated and applied to th...

In this part of the research, the recessed fitted type of bearings has been studied deriving mathematical expressions that could cover the fitted type of this bearing with its different configurations; showing also the recess effect on the bearing performance. This studied part showed the effect of the viscosity variation on the pressure, the load,...

In response to the importance of the industry great need to the hydrostatic thrust spherical bearing, this study is performed. The stochastic modified Reynolds equation (developed by the author in his previous papers) applied to this type of bearings has become more developed to deal with the bearing static performance under the effect of the fluid...

The study deals with the surface roughness and the predominant centripetal inertia terms due to the shaft rotation of the externally pressurized thrust spherical bearings. The solutions are presented for the recessed clearance type of bearings, hemispherical and partial hemispherical seats, with capillary tube and orifice restrictors. Expressions f...

This paper deals with the surface roughness and the predominant centripetal inertia terms due to the shaft rotation of the externally pressurized thrust spherical bearings. The solutions are presented for the fitted type of bearings, un-recessed and recessed hemispherical and partial hemispherical seats, with capillary tube and orifice restrictors....

The study deals with the surface roughness and the predominant centripetal inertia terms due to the shaft rotation of the externally pressurized thrust spherical bearings. The solutions are presented for the recessed clearance type of bearings, hemispherical and partial hemispherical seats, with capillary tube and orifice restrictors. Expressions f...

This study has theoretically analyzed the surface roughness, centripetal inertia and recess volume fluid compressibility effects on the dynamic behavior of a restrictor compensated hydrostatic thrust spherical clearance type of bearing. The stochastic Reynolds equation, with centripetal inertia effect, and the recess flow continuity equation with r...

Analytical solutions are not available for spherical bearing problems except for very specialized cases. However, this study offers a theoretical analysis, using the first order perturbations, to evaluate the frequency dependent stiffness and damping characteristics of compensated hydrostatic thrust spherical bearing including the surface roughness...

The clearance type of bearings, where the sphere radius is smaller than that of the seat, provides a great divergence in results compared with the fitted type. The study deals with the surface roughness and the predominant centripetal inertia terms due to the shaft rotation. The solutions are presented for the un-recessed clearance type of bearings...

This paper deals with the aspects of rough surfaces of the externally pressurized thrust spherical bearing, including the predominant centripetal inertia terms due to the shaft rotation. The solutions are presented for the fitted type bearing of un-recessed and recessed hemi and partial hemispherical seats with capillary tube and orifice restrictor...

This paper deals with the aspects of rough surfaces of the externally pressurized thrust spherical bearing, including the predominant centripetal inertia terms due to the shaft rotation. The solutions are presented for the fitted type bearing of un-recessed and recessed hemi and partial hemispherical seats with capillary tube and orifice restrictor...