Study On Dynamic Response Calculation Method Of Wind Turbine Main Shaft Bearing

Wind turbine is an important part of the wind power industry, and the main shaft bearing is the key component of wind turbine, which can absorb aerodynamic loads and transmit power. The research on dynamic response of main shaft bearing is relatively few, difficult to accurately understand the dynamic performance of its internal parts. But dynamic response performance of main shaft bearing directly determines the maintenance costs of the transmission chain and wind turbine transfer efficiency. Therefore, it is necessary to study the dynamic response performance of main shaft bearing.In this paper, took a 1.5MW wind turbine main shaft bearing as the research object, study its dynamic response under different working conditions and fault conditions. The specific contents and research conclusions include:(1) Established rigid multi-body dynamic model of main shaft bearing. Based on the multi-body dynamics, the dynamic model of the main shaft bearing was established by adding the constraints, loads, drive, and so on. Setted the speed of inner ring 10r/s, compared the separator speed and roller speed between simulate in ADAMS and the theoretical value of the calculation formula of the motion parameters of the rolling bearing, which proved the rigid multi-body dynamic model of the main shaft bearing was correct.(2) Studied on dynamic response of main shaft bearing under different working conditions. Three kinds of representative working conditions in the running condition of the main shaft bearing were simulated by using STEP function. The dynamic response of the main shaft bearing were studied on starting until running steadily, sudden variation and emergency brake of wind turbine. The results showed that the maximum contact force and the average contact force between the roller and the inner and outer rings were biggest during emergency brake of wind turbine. In the emergency brake stage, the maximum contact force between the roller and the separator was biggest, and the average contact force between the roller and the separator was biggest. The main shaft bearing rotation center was at the maximum range of motion during emergency brake of wind turbine, which caused the vibration and noise.(3) Difference between the dynamic response of the normal main shaft bearing and the pitting fault and the impurity fault in the rated wind speed of the wind turbine. Through similated the pitting fault and the impurity fault on the outer ring, the pitting fault and the impurity fault dynamic models of main shaft bearings were established in ADAMS. The dynamic response of the normal main shaft bearing and the fault main shaft bearing were compared and analyzed in the rated wind speed of the wind turbine. The results showed that the pitting and impurity fault spindle bearings caused obvious acceleration increase of all the parts, and pitting fault effected the roller acceleration larger, impurity fault effected the inner ring and separator more obviously.The research has been worked in this paper provides a reference for the design and optimization of the main shaft bearings, which guid significance to engineering application.