Title: A numerical study on the effects of branch numbers on the vibration characteristics of the engine fuel manifold system

Authors: Yunzhe Hou; Haoyang Zhang; Guanbing Cheng; Hongbo Peng

Addresses: College of Aeronautical Engineering, Civil Aviation University of China, 300300, Tianjin, China ' College of Aeronautical Engineering, Civil Aviation University of China, 300300, Tianjin, China ' College of Aeronautical Engineering, Civil Aviation University of China, 300300, Tianjin, China ' College of Aeronautical Engineering, Civil Aviation University of China, 300300, Tianjin, China

Abstract: The modal analysis of fuel pipelines was done by experimental modal vibration measurement. The physical and calculated models of the fuel manifold with various branches were established to examine the effects of branch numbers on manifold system structural parameters. The results show that the natural frequency and frequency calculated by the finite element method are in good agreement with the experimental results. The fuel manifold systems' frequencies increase stepwise. The first third-order frequencies are highest for the fuel manifold with 12 branches, and the later fourth-order ones are highest for the 8 branches manifold system. Due to the symmetrical structure of the pipe, the fuel manifold system has repeated modes. The first and third modes are characterised as bending vibrations. The second mode is a torsional vibration. The fuel manifold resonance frequency is in the low-frequency region; the radial frequency response value is lower than the axial one.

Keywords: aero-engine; fuel manifold system; experimental modal analysis; finite element; resonance; modal analysis; harmonic response analysis.

DOI: 10.1504/IJCSM.2024.137823

International Journal of Computing Science and Mathematics, 2024 Vol.19 No.3, pp.206 - 220

Received: 25 Jun 2023
Accepted: 27 Jul 2023
Published online: 05 Apr 2024 *

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