![]() ![]() The high-speed shaft (HSS) at the exit of the gearbox is connected with the brake by a revolute joint and a torsional spring in order to describe the shaft torsional stiffness. ![]() Accordingly a viscoelastic 6 DOF joint is provided between gearbox housing and nacelle. The gearbox housing is mounted on the nacelle by 40 bushing elements allowing a spatial relative motion. Accordingly a 6 DOF joint with spatial stiffness between main shaft and gear ring is provided in the model. The main shaft is elastically coupled with the gear ring at the input of the main gearbox by means of 21 bushing elements in order to reduce loads on the low-speed input shaft (LSS) of the gearbox due to shaft misalignments caused by elastic deformations. Aerodynamic loads on the blades are generated by the program AeroDyn and applied on the multibody system as applied forces. The three rotor blades are connected to the hub by revolute joints for pitch control. A revolute joint with a torsional spring between rotor hub and main shaft describes the torsional stiffness of the rotor shaft. The main shaft supporting the rotor is mounted on the nacelle in the rotor bearing that is modelled as a revolute joint. The nacelle is mounted on the tower by a rheonomically driven revolute joint for azimuth control. The tower assembly consists of a ground body with three rheonomically prescribed translational motions to simulate optional earthquake excitations, the basement connected with a three-dimensional bushing to the ground in order to simulate a viscoelastic ground, and the elastic tower body. Therefore these main components are defined as substructures within the multibody models. As a wind turbine of a certain type can typically be provided with different nacelles, blades, tower, or drivetrains in order to meet specific requirements of the installation location dynamic simulations are to be performed for different configurations. The main mechanical components are defined as rigid or flexible bodies that are connected by joints with different degrees of freedom and force elements. MSC.Adams and SIMPACK multibody models of the wind turbine are tree-structured according to Figure 4. ![]()
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