Analysis of Different Lubricants in Gearbox Performance using Ansys

Abstract

Abstract-In the present paper CFD based investigation has been reported in order to study about the power losses for different gear oils in operating conditions and alternative of it. It has been observed that there is significant change during working condition of gearbox. During working condition heat is generated, when two teeth meshes together. Because of heat generation inside the gearbox, the viscosity of the oil decreases and ultimately there is change in the oil properties. This change in gear oil properties(i.e decrease in gear tooth hardness, oil level and speed of gear and increase in vibration, noise, wear and power loss.) These losses are the sum of squeezing, churning and windage power losses. In order to predict the power losses in the gearbox performance the analysis is done using software ANSYS12 and a general idea about the gearbox model is created using modelling software SOLID WORKS 2012. Keywords-Gear, Gearbox, Lubricants, CFD, SOLID WORKS, Power Loss. I.INTRODUCTION Designing and choosing a gearbox for different industrial application are must to consider some performance specifications. These important specifications for gearbox designing and selection are gear ratio, torque, maximum input power, maximum input rpm, shaft alignment. The gear ratios can be defined as the relationship between the number of teeth on two different gears meshed together, the circumference of two pulleys connected with a drive belt. Torque is a rotational force. It is force multiplied by perpendicular distance. Power in mechanical systems is the combination of forces and moments. In particular, power is the product of a force on an object and the object's velocity, or the product of a torque on a shaft and shaft's angular velocity. A revolution per minute is a measure of the frequency of a rotation. It annotates the number of turns completed in one minute around a fixed axis. It is used as a measure of rotational speed of a mechanical component. The rapid advance made in computer hardware and software led to significant developments in FEA software. FE programming gas emerged as a specialized discipline which requires knowledge and experience in the diverse areas such as FE technology including foundations of machines, and numerical analysis on the one hand and the computational skills in areas of software technology including programming techniques, data structure, database management and computer graphics on the other hand.