Structural Design and Analysis of Megawatt Wind Power Gear Boxes

摘要

In this study, for the problems of detection difficulty and high mechanical performance requirement of megawatt wind power gear boxes, the gear box structure is designed and the finite element models of the box body and the gear box are established. First, force calculation and static analysis were performed when the box body undertaked 1.4 times of the rated load. The box body structure was improved under the condition of meeting rigidity and strength requirements: the materials of the upper and lower box bodies which bear less force were composed of QT350 instead of QT400, so as to save costs. Furthermore, the gearbox was supported by elasticity rather than fixation. Modal analyses were, respectively performed and the comparison showed that supported by elasticity could reduce vibration more effectively. Finally, the system?s frequency catching was analyzed on this basis. The results show that the system has no frequency catching, thus it cannot produce resonance and the structure is safe. The research has been applied to relevant equipments and is shown to run well, thereby providing a reference for actual manufacture.