Study Of Finite Element Modeling Method Of Vibration Analysis Of Typical Stator System Structures

Vibration is a main form of aero-engine destruction, so the analysis for the dynamics ofthe aero-engine is crucial. In the structure modal analysis with finite element method, thesimplification of the model is a key step. The structure of the aero-engine stator system iscomplex, without any simplification, it is difficult to finish the calculation with computer.Casing and stator blades are major parts of aero-engine stator system. Stator blades havea variety of structural forms. Cantilever blades, blades with inner ring and Load-bearingblades are typical stator blades. This article studies the finite element modeling method forsimplification in modal analysis, it can meet the accuracy meanwhile the model scale isreduced greatly. It is the essential preparation for the calculation modal analysis of the wholeaero-engine.This article analyzes the calculation result affected by element type, element quantity,and grid quality. The vibration modes of stator system are mainly composed ofcircumferential and axial bending, blades can be simplified to rectangular section beam withsection stiffness and mass equivalent method according to elastic deformation for blades inthe vibration analysis. It reflects good result that section equivalent method is applied to thesimplification for bearing seat casing together with bearing seat and so on rotational parts.Dimension reduction is applied for the simplification of the finite element model，shellelements, beam elements, mass elements are used to build the model. Comparing with thecalculation result of three-dimensional solid element model, it gets a good agreement. Themodel scale of finite element model is reduced greatly by dimension reduction.