Wind Turbine Gearbox Transmission Chain Forced Vibration Analysis Exerted by Random Actuator

The reason for the gearbox high failure rate is mainly its poor working environment, especially the vibration due to random actuator. Consequently, its necessary to study the gearbox vibration characteristics under random actuators to prevent from serious damage caused by a resonance. In order to follow the actual working condition, random input speed and random torque actuators are inputted with power spectrum density method (PSD). 64 orders of natural frequencies, displacement frequency response and modal participation factor are obtained after computation and simulation. The analysis results indicate transmission system resonance occurs likely. In addition, displacement vibration responses of planet gears and high speed shaft are the largest, which are the easiest to cause vibration fatigue damage. Keywords: wind turbine gearbox, transmission chain, vibration analysis, random actuator