Blade system's vibration behavior analyzing method for rotor of engine of airplane, involves calculating change of force acting on part of geometrical model, and determining resonance of part of model based on force change

摘要

The method involves providing a geometrical model e.g. three dimensional finite element model, of a blade. Kinematic boundary conditions are determined at an initial point of a part of the model based on vibration form to be analyzed by considering a concrete exciter arrangement. Change of force acting on the part of the model is calculated from the initial point over time away from a basic principle of the model and the kinematic boundary conditions. A resonance of the part of the model is determined based on the force change. Independent claims are also included for the following: (1) an arithmetic unit for analyzing vibration behavior of a blade system with blades of a rotor (2) a computer program product comprising instructions for performing a method for analyzing vibration behavior of a blade system with blades of a rotor.