Dynamic Characteristics Analysis And Optimization Design Of Wind Turbine Transmission System

The rapid development of the wind power industry puts forward a higher demand for the stability and reliability of wind turbine transmission system.Gearbox,as one of the most significant components of the transmission system,the study on whose dynamic characteristics and optimized inner component under the complex loads can be a guidance to the design,efficiency and service life of the wind turbine.In this paper,the mainstream wind turbine transmission system with 1.5MW in the market is regarded as the study object.And the dynamic characteristics of gearbox,the optimization of the key components as well as the fatigue life of vulnerable components are been researched.The details are as follows:First of all,by comparative analysis of the transmission scheme of gearbox,this paper determined the gearbox's transmission structure.And by using the traditional design method,this paper got the the design parameters of all parts.Then,it conducted the optimized design to the design parameters by utilizing the MATLAB optimization toolbox,and it established the optimization platform of the gearbox's inner parameters.The flexible shaft of the planet carrier was designed.and three dimension model of transmission system was built by UG software.At the same time,the stress of inner structure was analyzed and the strength of every component was proofread thus to verify its load sharing.Secondly,according to the theory of multi-body dynamics,it established the dynamics model of the transmission system.And it imported the built-three-dimension model into the ADAMS software and built the virtual prototype thus to calculate and set the prototype parameters needed for the simulation.It made the key parts flexible by adopting the the data interface among Hypermesh,ANSYS,and ADAMS,thus to replace the key parts of the rigid body model and establish the rigid-flexible coupling model.The gearbox's dynamic characteristics of the rigid body model and the flexible body model under steady wind and strong wind are analyzed respectively,thus to find some maximum dangerous node that is suffered by the flexible body.By comparison with the dynamic characteristics and the error of the theoretical figures between the two models,the accuracy of the prototype was determined.Finally,this paper made a modal analysis and made a multi-objective optimization as well as a topology optimization about the planet carrier and buffer of the key component by adopting ANSYS Workbench,thus to make the component structure more reasonable and decrease the quality and maximum stress of the planet carrier and buffer.It also avoids the stress concentration and improves the use performance of the planet carrier.Fatigue analysis software was used to predict the fatigue damage and the fatigue life of the buffer under dynamic load.