Abstract
In this study, a gearbox and blade were modeled in the MASTA program, and the housing and carrier components were modeled using a finite element method. Using substructure synthesis, all the components were combined and used to establish a vibration model of a 2.5-MW wind turbine gearbox. In addition, the safety displacement factor was evaluated using an AGMA data sheet about bearing's outer race for the input shaft and output shaft. As a result, the bearing's outer race for the input shaft, and the radial and axial responses were satisfied by the <TEX>$1^{st}$</TEX> and <TEX>$2^{nd}$</TEX> planetary gears and the <TEX>$3^{nd}$</TEX> helical gear transmission error(TE), respectively. However, the output shaft support bearing's outer race responses were not satisfied with the radial response by the <TEX>$2^{nd}$</TEX> TE and axial response by the <TEX>$3^{rd}$</TEX> TE. To reduce the vibration, tooth modification was needed. After profile tooth modification, at the outer race of the output shaft support bearing, the radial response was reduced by approximately <TEX>$20{\mu}m$</TEX>, and the axial response was reduced by approximately <TEX>$6{\mu}m$</TEX>.
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