Experimental and Model-based Analysis of the Force Transmission in a Rotor Bearing Support System

Abstract

Due to complex interactions, the mechanical components of a rotor bearing support system cannot be designed and evaluated independently. Only the combination of all elastic components determines how external loads are transmitted into the tower. Simulation models attempting to answer this question only become reliable by using validated modelling techniques. The parallel investigation of a rotor bearing support system on a system test bench and in a simulation model enables a detailed analysis of the mechanical interactions between the main bearing, the gearbox and the structural components. Significant nonlinear effects, that can be observed on the test bench and should therefore be considered in the model, are the clearance and stiffness-characteristics of the main bearing, the planet carrier bearings and the clamping bushings in the torque arms. The assembly process of the drivetrain and gravity loads also have an influence on component movement and force transmission under external loads. The analysis of the mechanical phenomena with the help of simulation promotes system understanding and thus the possibility of further development and improvement.