Finite element analysis method for thermal-coupled vibration characteristics of impeller structure

Abstract

The invention provides a finite element analysis method for thermal-coupled vibration characteristics of an impeller structure. The technical scheme is that the finite element analysis method comprises the following steps: establishing a three-dimensional model of the impeller structure by utilizing a solidworks parameter modelling method; importing the three-dimensional model of the impeller structure into finite element analysis software ANSYS, setting the attributes, parameters, loads and constraints of materials according to the actual working conditions in an ANSYS software pre-processing module, and dividing finite element grids; calculating the first five orders of fixed frequencies of the impeller structure at different rotation speeds through an ANSYS software modal analysis module; calculating the first five orders of fixed frequencies of the impeller structure at different rotation speeds in high-temperature environment through considering the influences of a temperature field; comparing the fixed frequencies in above analysis to obtain the influences, caused by the temperature field, on the vibration characteristics of the impeller structure, so as to provide theoretical basis for the failure mechanism research of the impeller structure under the high-temperature environment.

Description

technical field [0001] The invention relates to a finite element analysis method of a rotating machine, in particular to a finite element analysis method of thermally coupled vibration characteristics of an impeller structure. Background technique [0002] When the rotating machinery is in operation, it is subject to the effects of pneumatic excitation, mechanical excitation, thermal flow field, etc., which can easily cause the vibration of the whole mechanical structure, and make the body, rotor system, accessory system, main bearing and other components have obvious vibration responses. At the same time, with the increase of the rotating speed of the rotating machinery, the gap between the rotating and static parts is continuously reduced, which intensifies the thermal shock effect of rubbing between the rotor and the stator and the dry friction instability of the rotor. Severe thermal effects will cause blade breakage, rotor instability and The destruction of the engine s...

AI Technical Summary

Problems solved by technology

At the same time, with the increase of the speed of the rotating machinery, the gap between the rotor and the static parts is continuously reduced, which intensifies the thermal shock effect of rubbing between the rotor and the stator and the dry friction instability of the rotor. The severe thermal effect will cause blade fracture, rotor instability and Damage to the engine structure, leading to major operating accidents

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