The Design And Finite Element Analysis Of Large Scale Wind Turbine Crane

With the growth of the domestic demand for wind power capacity, under the global environment to become commercialized crew mainstream in megawatt, the wind power industry in china is developing rapidly. The demand for maintaining to the wind turbines become increasingly strong. However, existing maintenance is only limited to the large crane lifting. Whether the environmental benefits or the economic benefits are not ideal, and long construction period, complicated construction degree, low safety level, even no guaranteed. Therefore, the development of high safety factor, convenient construction and adaptability of new maintenance equipment is necessary for the large wind turbines maintenance.With the basic arm’s height, width and wall thickness, the first arm’s wall thickness and the second arm’s wall thickness as the design variables, the arm’s stiffness and strength as the state variables, and the total volume as the optimization objectives, the author designed the arm by using the first order optimization method. Then analysis the character of the arm’s statics and buckling to verify the stiffness and strength. Verified the arm instability does not occur under the case of nominal weight. Completed the tray’s design and finite element analysis, rotary support’s selection, chassis and clamping mechanism’s design and finite element stress analysis. Completed the wind main structure of wind turbine crane’s design.Made the statics finite element analysis to the whole structure of the wind turbine crane to calculate the turbine crane’s strength and stiffness. Concluded the strength and stiffness of the turbine crane can meet the design demand by analyzing the equivalent stress contour, displacement contour and the result data. Mastered the wind turbine crane’s form of the deformation, size and the stress’s distribution law. In addition, this paper also analyzed the impact of the wind turbine crane to the wind crane tower drum. Finally, this paper proved that the wind turbine crane which was designed in this paper can be used to lift and replace the components inside the nacelle of the wind turbine.Analyzed the dynamic characteristics under the statics analysis including modal analysis Made the modal analysis by the Subspace method, extract10orders natural vibration period and inherent frequency, which are compared and analyzed with external frequency hoist gave, avoid resonance occur in the practical work.Using the ANSYS transient analysis, this paper made the transient analysis to the wind turbine crane’s arm under four conditions, and got the displacement response curve of suspension centre, the velocity response curve of suspension centre and the acceleration response curve of suspension centre. Mastered the transient motion of the arm’s suspension centre under the four conditions. This is beneficial to the operating person to control the wind turbine crane better.