|Table of Contents|

Simulation analysis for vibration fatigue of the screw in divert and attitude control system(PDF)

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

Issue:
2019年04期
Page:
38-44
Research Field:
研究与设计
Publishing date:

Info

Title:
Simulation analysis for vibration fatigue of the screw in divert and attitude control system
Author(s):
XUE Jie; WANG Wei; DU Dahua; SUI Lutao
(Science and Technology on Liquid Rocket Engine Laboratory,Xi’an 710100,China)
Keywords:
vibration fatigue;  full modes;  linear cumulative damage;  stress response
PACS:
V439.7
DOI:
-
Abstract:
The vibration fatigue failure of the screw in divert and attitude control system(DACS)after two consecutive tests in two directions was analyzed by simulation.First,the modal analysis was conducted and the random vibration of DACS was simulated through FEA(Finite Element Analysis),and the stress response of the first nine single modes and full modes were extracted,according to the results of frequency response analysis.Second,based on the Dirlik’s empirical formula describing the magnitude probability density function of the stress response and the linear cumulative damage rule of Palmgren-Miner,the numerical calculation of screw cumulative damage was realized through Matlab.At last,the conclusion that the stress RMS(Root Mean Square)alone is not an adequate evaluation for the structural safety and the influence of each mode on the vibration fracture of screw was obtained,and it can provide a reference for the structural improvement and the further analysis of the screw vibration fracture.

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Last Update: 2019-08-31