Modal analysis of typical bending pipe of aero-engine

Abstract

Abstract: In order to tackle the abnormal operation problems caused by the vibration of the bending pipes of aero-engine system with different structural characteristics, the paper constructs the performance analysis models of the bending pipe with the different bending angles and the different pipe head lengths as the parameters. Then numerical simulation calculation is done to get the bending pipe vibration characteristics of the different bending angles and the pipe head lengths with the vibration modal analysis method. The results are analyzed and compared with the ones obtained by the vibration modal test of the bending pipes with different angles. The results show that the natural frequency of the same order of the models (1-4) mainly display the decreasing trend with small discrepancy along with the increase of bending angles, and the main deformation of the structure with bending superimpose torsion constantly and the amplitude of deformation increases gradually. Then the natural frequency of the same order of the models(5-9) display complex change with the increase of the length of the pipe head, and the main deformation of the structure isthe same asthe models(1-4) basically, except that the bending pipe with curved section located at the middle of the pipe is more affected. It is concluded that the vibration characteristics of bending pipe are complex with respect to the straight pipe. And it is necessary to analyze comprehensively the bending pipe vibration from multiple angles to keep away the vibration range generated by the coupling with the aero -engine vibration and thus improving the reliability of the design and use of the bending pipe in the aero-engine system.

Key words: aero-engine, bending pipe, bending angle, pipe head length, vibration characteristics

CLC Number:

V233

WANG Zhiguo. Modal analysis of typical bending pipe of aero-engine[J]. Journal of Civil Aviation University of China, 2022, 40(6): 24-31.

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