Flexible Body Danamic Simulation Research For 2MW Wind Turbine With Component Mode Synthesis Theory

In recent years, wind power thanks to the people’s awareness of the importance of environmental issues, advances in transmission technology and increase in efficiency of power generation, which has been re-enter the fast track of rapid development.Wind turbine gearbox is the most important equipment of entire wind power generator system. However, because of their year-round work in the bitter cold and scorching heat,its work environment is very harsh, its failure rate has become one of highest of whole system. Resonance is the main factors that make the system out of work, so it is necessary to make a more accurate analysis, predicting resonance point, and it should be targeted to optimize,in order to guarantee the smooth functioning of gearbox.This subject comes from the research and development projects of 2MW Wind turbine gearbox, which is responsible by the Zhuzhou High-precision Transmission Technology Co., Ltd. Transmission system parts is divided into several sub-structure, using FEM software ABAQUS to calculate modal of substructural, and during multi-body software SIMPACK for modal synthesis, which calculate natural frequencies. By the four principles to screen resonance point of the system. By staggering System natural frequency and excitation frequency to optimize it.The main contents and achievements of this thesis are as follows:(1) In the field of dynamics, the calculation of rolling bearing stiffness is accurate or not that affects the accuracy directly of dynamic response. From the strat of the rolling bearing static and kinematics, considering the different of each roller suffered load and the actual contact angle, using deformation coordination principle and Hertz contact theory, derived their 5-by-5 stiffness matrix based on time-varying load.(2) This project is designed to calculate a more realistic response of system frequency, and system dynamics model created by modal synthesis method. Combined with the use of ABAQUS and SIMPACK, calculating the dynamics response of the flexiblebody. According to principle of frequency, principle of damping, principle of energy, principle of the same speed level,which combined with the Campbell of system, calculating the resonance point of system.(3)By changing the bearing span, altering the stiffener layout of the housing, to adjust the natural frequency of the system, by changing the number of teeth to adjust the excitation frequency. In a way that makes the system natural frequency and excitation frequency staggered, it as to a method of removing an resonance point, to optimize the design of the system.(4) The industry’s authoritative international standards are reference to the vibration test of this thesis, and identified the plan of vibration test. By using testing equipment collected more complete results of text. After the predicted resonance point, using the optimization method of this thesis, optimize the system. Through vibration tests founded that the two potential points of resonance was removed.