In this paper, firstly, based on the fractal theory, Hertz contact theory and fractal network, the prediction model of the ECR for rough interface is established in consideration of the modified hypothesis, 3-D interface topography and elastic-plastic deformation. Secondly, using the engineering data of material, the influences of fractal dimension D, fractal roughness G , dimensionless loading force F* and friction coefficient μ on the ECR are analyzed by numerical simulation. Finally, compared with the classical models, the tendency of established model is same as that of other models. During the design stage of electrical equipment, the present model of the ECR can provide a theoretical reference for the accurate ECR prediction of rough interface.
With the rapid development of international education, international schools have become an important part of global education because of their superior education levels, and branding has become the core competitive marker of international schools. Therefore, from the viewpoint of customer perception, this study measured the brand equity of international schools in order to explore the impact of brand equity on customers' willingness to pay premiums for international schools and to provide feasible solutions for international schools regarding brand management and relationship marketing strategy formulation. The results showed that brand trust and brand communication can effectively promote customers' willingness to pay premiums, and customer perception plays an intermediary role.
With the development of spacecraft, the requirement for high-power, long-life and high-reliability electrical transmission technology of the rolling ring is increasingly urgent. Aiming at the friction pair’s structure of the rolling ring, relevant theoretical and experimental research was carried out. The kinematic model is established to determine the friction pair’s structure of the rolling ring, and the zero sliding of friction pair is verified by ADAMS simulation. The electrical contact resistance and fatigue life of the friction pair are theoretically analyzed, and the cycling life of the flexure was analyzed. The stress distribution of flexure during rolling was simulated by FEM. The lifetime experiment of 1.5 × 105 r that the prototype transmitted the 6.6 kW of single loop was verified. The experimental result shows that the electrical contact resistance and the fluctuation value of the single loop are less than 1m Ω during the rolling, although the transmission power increased to 10 times as compared with the traditional slip ring. The kinematic model can provide a certain theoretical reference for design of the space high-power and long-life rolling ring.
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