Finite Element Analysis And Structure Optimum Design Research For Diaphragm Of Diaphragm Coupler

Wind energy is an endless and clean reproducible energy, in-depth research of wind turbine technology has very important meaning for persistent wind turbine development and home production.Diaphragm coupler is the connection between wind turbine speed increasing gear box and generator rotor shaft, it is one of the important components of wind turbine drive train. With high power transmit ability, long life, simple structure, no need of lubrication, and compensation of axial, radial, angular displacement, the diaphragm coupler is suitable on high speed and high power machine. It need enough strength and rigidity to promise the normal run of wind turbine under every load case. This research based on material mechanics, elasticity mechanics, fracture mechanics theory, using FEM, according to Germanischer Lloyd (GL) wind turbine certificate guideline, was to do the design and calculation of big scale wind turbine diaphragm coupler for a company and to fill the vacancy of the country.The main researches of the paper had listed as follow:Chapter 1 used the application status and development tendency of wind turbine technology world wide as a background, introduced the research and application circumstance of the diaphragm coupler in and out of the country, and expressed the meaning and main contents of the paper.Chapter 2 explained the structure and characteristic of diaphragm coupler, and according to the request of material selection of diaphragm and type selection of diaphragm coupler and the loads withstood by the diaphragm coupler, its design and calculation were done, and wind turbine diaphragm coupler solid geometrical model was built.Chapter 3 based on elasticity mechanics and FEM modeling theory to t\do the strength FEA for diaphragm as one of the key component of diaphragm coupler. With a comprehensive consideration of the torque, centrifugal force, axial displacement, radial displacement and angular displacement, the finite element model of diaphragm was built, extreme strength verification, buckling calculation and results analysis were realized to satisfy the coupler axial, radial, angular displacement, strength and buckling design request.Chapter 4 according to fracture mechanics and fatigue cumulation damage theory, considering the effect for fatigue life caused by mean stress, the fatigue life computation was completed to ensure the normal run and life. Load spectrums were made according to actual loads of diaphragm,Chapter 5 based on various structure optimization method, according to the structure of diaphragm, density method was used for its topology optimization. Finite element model was built for diaphragm topology optimization, and static strength analysis was done, topology optimization was continued, and the static strength, buckling, mode, and fatigue verification were done for diaphragm, and gained the optimized diaphragm structure.Chapter 6 made the conclusions and prospects.