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This paper establishes mathematical model of radial lip seals and flow factors method are used to show the influence of aging in oil and wear on such features as pumping rate, friction torque. The root mean square (RMS) roughness is a vital parameter to predict the sealing performance in the model of lip seals. And the RMS of the elastomeric material is intensely influenced by the time of aging in...
The aim of this paper is to investigate propagating and scattering characteristics of guided wave in the layered plate with defects and to determine whether it is possible to detect, locate and classify the defects by monitoring the echo signals. First, it is considered a two-layered plate consist of steel and aluminum. The guided wave is calculated and analyzed by the transfer matrix and Finite Element...
In this paper, it is based on the theory of aerodynamics and one 1∶1 heavy-duty commercial vehicle geometry was built. The numerical simulation of the vehicle was completed by modifying the geometric model, simplifying the mesh and solving the control equations, Using computational fluid dynamics(CFD) commercial software—Ansys Fluent to complete the simulation. The theory of aerodynamic drag was obtained...
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