APPARATUS AND METHOD FOR ANALYZING VIBRATION IN ROTATING STRUCTURE

PROBLEM TO BE SOLVED: To analyze a coupled vibration of an unbalanced forced vibration and a self-excitation vibration in a rotating structure. SOLUTION: A vibration analysis model 18 of the rotating structure is obtained, and created by using a finite element method. A fluid force model 20 of a slide bearing for supporting the rotating structure is obtained. A motion equation deriving section 28 derives a motion equation of the rotating structure supported by the slide bearing from the vibration analysis model 18 of the rotating structure and the fluid force model 20 of the slide bearing. A time history response calculating section 30 solves the motion equation, and calculates a time history response between the vibration in the rotating structure and a force generated from a bearing fluid. A vibration analyzing section 32 analyzes the vibration in the rotating structure by analyzing a frequency of the calculated time history response. COPYRIGHT: (C)2008,JPO&INPIT