Epicyclic Load Sharing Map — Development and validation

A dynamic model to study the influence of planet position errors in planetary gears

“…Using an instrumented planetary gear with tightly controlled intentional manufacturing errors operated under realistic load and speed conditions, Ligata et al [31,32] presented a number of experimental results at low speed on the influence of carrier pinhole position errors on planet load sharing showing the prominent influence of tangential planet position errors. The experimental data compared well with the predictions of a multi-body contact analysis model [33,34] but also with the dimensionless closed form expressions obtained by Singh [35,36] valid for any error and torque as long as quasi-static conditions prevail.…”

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

“…Research by August and Kasuba [8] concludes that the nonfloating sun gear arrangement generally performs better than a floating sun gear for errorless gears. Their work and many other studies [7,10,11,51] evaluates the dynamic loads on gears without considering bearings.…”

“…The reason for this requirement is based on the fundamental geometry rule stating that one surface passes through three points, so four or more planets create a redundant system with respect to the sun's orbit. 3 Many studies on planetary gearbox dynamic analysis are devoted to developing analytical models [8][9][10][11], with a focus on gear dynamic loads, and a few experiments are reported on wind turbine applications [12][13][14]. According to Musial et al [15], most gearbox failures initiate at the bearing and do not begin through gear failures.…”

A study on load-sharing structure of multi-stage planetary transmission system

“…Then, many research studies were carried out on dynamic load-sharing behaviors. But most of the literature was mainly about load-sharing coefficient calculation [6,7], and some simple curves with variation of parameters were obtained [8][9][10] including the influences of errors, speed, and input power on load imbalance. Sensitivity of transmission system was another emphasis placed on gear transmission [11,12].…”