关键词: 模态, 振动, 有限元法, 运行模态分析

Abstract:

The modal analysis of a propulsion motor was presented. A numerically equivalent model was established to acquire the natural frequencies and mode shapes of the propulsion motor using finite element method(FEM). Using operational modal analysis (OMA), experiment was performed to identify natural frequencies by the spectrum properties of the response data.The FEM model and the result of modal analysis were validated. The research forms the foundation for the analysis of propulsion motor’s vibration and noise.

Key words: modal, vibration, finite element method (FEM), operational model analysis (OMA)