the objective of this research is geometrical optimization of half toroidal continuously variable transmission (cvt) in order to achieve high power transmission efficiency and low weight. after dynamic analysis of the system, the contact between the disk and the roller is modeled according to elasto-hydrodynamic lubrication principles. accordingly, a computer model is created with geometric, th...

Artificial total hip arthroplasty (THA) is one of the most effective orthopaedic surgeries that has been used for decades. However, wear of the articulating surfaces is one of the key failure causes limiting the lifetime of total hip implant. In this paper, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were employed to e...

Abstract This work proposes a novel model and numerical formulation for lubricated contact problems describing the mutual interaction between two deformable 3D solid bodies an interposed fluid film. The are consistently described based on nonlinear continuum mechanics allowing finite deformations arbitrary constitutive laws. film is modelled as quasi-2D flow problem governed by (thickness-)aver...

Sliding bearings are the main kinematic pair of a Stirling engine, and one sources friction power loss excitation force. There is coupling effect between lubrication state In this paper, dynamic model Sapphire bearing fatigue test bed, which includes thermo-elasto-hydrodynamic (EHD) property, established accuracy verified by experimental data. Based on model, effects load, oil supply temperatur...

The increasingly high demands for compact design require journal bearings to work under severe operating conditions. A steadystate mixed-TEHD (thermo-elasto-hydrodynamic) model for journal bearings has been developed. The model considers the fluid flow in the gap formed by rough surfaces, asperity contact, surface thermoelastic deformations, and a temperature–pressure–viscosity relationship for...

In the Structural Dynamics and Acoustics group at the University of Twente, we aim to develop a quantitative tyre/road noise model. An essential part of this model is an accurate contact algorithm which is fast enough to simulate tyre vibrations up to the acoustic frequencies. In this paper we present a contact algorithm, describing the contact between a tyre and a road surface, which has the p...