Abstract：Dynamic performance of growth gearbox which is the core device of wind power generating systems has a direct effect on the whole wind power system. This article analyzes the basic structure and driving principle of a megawatt level wind turbine gearbox, gear modification volume of all levels and tests dynamic performance of gearbox before and after modification on a megawatt level gearbox rank. The study reveals that rational gear modification will improve dynamic performance of wind turbine gearbox, the main frequencies of vibration of wind turbine focus on mesh frequencies and their multiple-frequencies of output stage and middle-class transmission. After modified，vibration acceleration, the time-history shock response spectrum and the vibration intensity will drop accordingly. It provides an important basis for modification of wind turbine gear box and optimization of dynamic performance.
2013, Vol. 32 
