Research On Key Technologies Of Testing Machine Of Wind Turbine Bearings

With the conflict between the recent energy shortages and the economic development was highlighted, as the representative of new energy industry, wind power industry has entered the fast track of development. The last five years in China, wind turbine capacity has increased from 750KW to 1.5MW or 3MW, and a few companies have developed 6MW wind turbines. Wind turbine always run in complex environment, as key components, it is essential to test wind turbine bearings properties, so we need develop a testing machine to test their properties. To meet the test requirements of wind turbine bearings, the task of the subject is to do load analysis and finite element analysis to the key components of testing machine of 3MW wind turbine bearings.At first, in this thesis, after collected a large number of information about the similar devices, ultimately, we determined the overall design of the testing machine and with the help of PRO/E, the three-dimensional model of this machine was established. The structure is horizontal type with double axes, this structure is not only can load on both ends, reducing the overall size of machine, but also more convenient when install the test bearings. Secondly, based on momentum theory, blade element theory, momentum-blade element theory, axial force, radial force and overturning moment of spindle bearings, pitch bearings and yaw bearings were calculated. At last, the static strength and dynamic properties of testing machine key components of 3MW wind turbine bearing were analyzed to obtain the strength and stiffness check as well as the optimizing design of key components of bearing testing machine. The program of increase in wall thickness and add the trapezoidal ribs were compared, through contrast the advantages and disadvantages of two programs, and the strength was checked and satisfied with the demand of material strength. The former five orders natural frequencies and corresponding modes were obtained, which provides scientific basis for future design. At last, the structure of frame which meets the static analysis and modal analysis requirements were supplied.