ABSTRACT Epicyclic gear trains are widely used in various industrial sectors due to their advantages over fixed-axis gears, such as high torque capability, compact size, differential and planetary designs, ease of adjusting gear ratios and even directions of rotation. This research focuses on planetary gearbox whose degree of freedom is one. The geometry and dynamics of the planetary gear train...

In this study, the elastohydrodynamic lubrication (EHL) behaviour of high-speed spur gear contacts is investigated under dynamic conditions. A non-linear time-varying vibratory model of spur gear pairs is introduced to predict the instantaneous tooth forces under dynamic conditions within both the linear and non-linear operating regimes. In this model, the periodically time-varying gear mesh st...

Research on damage of gears and gear pairs using vibration signals remains very attractive, because vibration signals from a gear pair are complex in nature and not easy to interpret. Predicting gear pair defects by analyzing changes in vibration signal of gears pairs in operation is a very reliable method. Therefore, a suitable vibration signal processing technique is necessary to extract defe...

This paper presents design and torque analysis in various types of magnetic gear with different magnetic materials and air gap. This type of gear offer both high speed and high torque required for drive applications. In the proposed gear analysis the low speed side is connected to prime mover and high speed side is connected to load, suitable for wind power, automobile applications and group dr...

A dynamic analysis method is firstly presented to make up the present methods for calculating the strength of the cylindrical gear pair. The transient stress distribution and variation in the process of gear meshing can be obtained by dynamic simulation, the maximum bending stress, the maximum tooth contact stress and the corresponding worst meshing locations of the gear pair can be also accura...

Results are presented from a new algorithm developed for separating the vibration signals from a planetary gear system into separate signals attributable to each planet gear. From the separate signals, time synchronous average signals are produced for each planet gear and for the sun gear meshing with each planet gear. Assessments of the individual planet and sun gears can be made from these ne...

The design of drives for high accelerating loads becomes very simple and clear with the fact that the torque– acceleration product is transmitted unchanged by an ideal gear, just like in the case of the torque–speed product (i.e., mechanical power). With this knowledge, it is easy to determine the required rated power and power rate a motor must possess for driving a given load with the specifi...

Gear contact surface wear is one of the important failure modes in gear systems. The procedure implemented in this work includes finite element multi pair contact modeling to predict the load sharing between the simultaneously contacting pairs and mathematical programming method to estimate the gear surface wear in high contact ratio gear drives for particular number of cycles. A method to find...

Damage progression tests were performed in the NASA Glenn Spiral Bevel Gear Fatigue Rig. Six gear sets with varying levels of tooth damage were tested, and vibration-based gear condition indicators, amount of debris generated, and oil temperatures were measured. The damage state was documented with photographs taken at inspection intervals throughout the test and was quantified with a numerical...