Analysis of Thermal Deformation of a Rough Slider and Its Asperities and Its Impact on Load Generation in Parallel Sliders
Heating is inevitable in any bearing operation. This leads to not only the thinning of the lubricant but also could lead to a thermal deformation of the bearing. The present work is an attempt to analyze the influence of thermal deformation on the thermohydrodynamic lubrication of infinitely long tilted pad slider rough bearings. As a consequence of heating the slider is deformed and is assumed to take a parabolic shape. Also the asperities expand leading to smaller effective film thickness. Two different types of surface roughness are considered: longitudinal roughness and transverse roughness. Christensen’s stochastic approach is used to derive the Reynolds-type equations. Density and viscosity are considered to be temperature dependent. The modified Reynolds equation, momentum equation, continuity equation and energy equation are decoupled and solved using finite difference method to yield various bearing characteristics. From the numerical simulations it is observed that the performance of the bearing is significantly affected by the thermal distortion of the slider and asperities and even the parallel sliders seem to carry some load. Keywords—Thermal Deformation, Tilted pad slider bearing, longitudinal roughness, transverse roughness, load capacity.
Analysis of Thermal Effects in a Long Porous Rough Slider Bearing
This paper analyses the thermal and roughness effects on different characteristics of long porous slider bearings numerically. The roughness is assumed to be stochastic, Gaussian randomly distributed, and viscosity is assumed to be temperature dependent. The cases of one-dimensional longitudinal and transverse roughness are considered. The irregular domain of the fluid due to roughness is mapped to a regular domain so that the numerical method can be easily applied. It is shown that the combined effect has a significant influence on the performance of the bearing. The impact of the influence depends on the type of roughness and the permeability of the porous matrix. For transverse roughness model it is seen that the combined effect enhanced the load carrying capacity when compared to that of thermal effect on smooth surface, and the opposite is true for longitudinal roughness. However, the load capacity of the bearing is decreased due to the combined effect compared to that of roughness effect for both types of roughness models.
White-Collar Crime in Modern England: Financial Fraud and Business Morality, 1845-1929.
List of tables Acknowledgments Introduction 1. The new economy: transformation of finance and opportunities for crime 2. The railway mania 3. Banking and credit fraud 4. Stock fraud 5. Company fraud: promotion 6. Company fraud: management 7. Company law and the courts 8. Business ethics and professionalization Conclusion Notes Bibliography Index.