In the design of tribology pairs, the Rayleigh step bearing is known as a bearing with the highest load capacity amongst all other possible bearing geometries. This paper mainly discusses a new high-speed bearing with shallow and deep cavities on the inner surface of the bearing, and further the physical phenomena in laminar flow and turbulence regimes was revealed. In doing so, the pressure distribution was calculated first using the continuity equations and then performances in the whole flow domain such as pressure distribution, load-carrying capacity, friction force and friction coefficient were calculated. In addition, a set of optimum geometries are shown to provide the highest load capacity for the Rayleigh step bearing under varied Reynolds number. Finally, associated conclusions were drawn by comparison between results under the coexistence state and under the laminar state.

According to the crane dynamics theory, the dynamical model of a bridge crane's three main mechanisms is established and the dynamical load is determined under different work conditions in the paper. The three-dimensional solid model of the bridge crane is built by Pro/E, and then which is imported in ADAMS through the interface module of Mech/Pro. The virtual prototype model of the bridge crane is formed in ADAMS when relevant constraints and loads are applied. Based on the model, the bridge crane’s kinematics and dynamics performances are simulated and analyzed, and which shows that the simulation results can provide valuable guidances for design of the bridge crane.