|Table of Contents|

Finite element model updating of thrust frame combining static and dynamic test data(PDF)

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

Issue:
2021年05期
Page:
56-64
Research Field:
研究与设计
Publishing date:

Info

Title:
Finite element model updating of thrust frame combining static and dynamic test data
Author(s):
YAN Song1; LI Bin2; LI Feng1; YUAN Junshe3
(1.Science and Technology on Liquid Rocket Engine Laboratory,Xian Aerospace Propulsion Institute, Xian 710100,China 2.Academy of Aerospace Propulsion Technology,Xian 710100,China 3. Xian Aerospace Propulsion Institute, Xian 710100,China)
Keywords:
model updating liquid rocket engine static test modal test thrust frame
PACS:
V214 TB12
DOI:
-
Abstract:
In order to obtain an accurate structural dynamic model of thrust frame in liquid rocket engine,a detailed structural dynamics modeling approach was adopted to establish a detailed finite element(FE)model that can simultaneously describe the static and dynamic characteristics of the frame.The established model was further updated according to two different types of test data. The static test under the fixed support state was carried out,and the displacement response of the key measuring points on the frame was obtained. The modal test under the free state was carried out,and the natural frequency and mode shape under this state were identified. Finally,using the obtained displacement data and the natural frequencies as the objective function,the six most sensitive parameters to displacement and frequency in the elastic modulus of frame materials were updated. The results show that the updated frame model agrees well with the measured values not only within the frequency range used in the correlation,but also beyond the frequency range used in the correlation. It is feasible to combine static response data and modal test data in the model updating. The static test results can provide the information that is not available in the modal test,which is beneficial to the model updating process.

References:

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