|Table of Contents|

A global vibration evaluation method based on information of limited measuring points for a complex pipeline(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2022年02期
Page:
45-55
Research Field:
目次
Publishing date:

Info

Title:
A global vibration evaluation method based on information of limited measuring points for a complex pipeline
Author(s):
GAO Xuan1; CHEN Hongen1; WANG Meng2; LI Shuyun1; YANG Sa2; LI Yong1; CHEN Hui2; CHEN Zhenmao1
(1.School of Aerospace Engineering, Xian Jiaotong University, Xian 710049, China 2.Xian Aerospace Propulsion Institute, Xian 710100, China)
Keywords:
global evaluation pipeline vibration limited measuring points fine finite element modeling inverse analysis
PACS:
V434
DOI:
-
Abstract:
In this paper, a method was proposed and validated through numerical analysis and experiments to evaluate the global vibration state of a pipeline by establishing fine finite element model of the pipeline structure with practical excitation loads and constraint conditions. The major contents of this paper include three parts.Firstly, a finite element model for efficient forward analysis of the random vibration of typical engine pipeline system was developed, and a rule to select the number and the position of the vibration measuring points was proposed. Secondly, a multistep strategy was proposed to reconstruct the load and constraint parameters, respectively. And an inversion scheme and corresponding numerical code were developed based on the conjugate gradient optimization method. Furthermore, a reliable finite element model was established based on the designed geometry of the pipeline and the reconstructed load and constraint parameters to give proper prediction of vibration at any point of the pipeline. Thirdly, an experimental system was established with a cantilever straight pipe and a typical pipe structure of a real engine, to measure the vibration and dynamic strain signals under excitation of sinusoidal and random load. Based on the measured information, the load and constraint conditions were reconstructed and the fine finite element model using reconstructed information was established, which was proved capable to evaluate the global vibration state of the whole pipe structure. As conclusion, the method of this paper can give good prediction of the vibration state at any position of pipeline from both the simulated and measured vibration signals at limited measuring points, and predict the location and value of the maximum stress point for the structural integrity evaluation of the pipeline from the heavy rocket engines.

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