|Table of Contents|

Effect of bolt pre-tightening force on dynamic characteristics of vibration test fixture(PDF)

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

Issue:
2020年06期
Page:
69-75
Research Field:
研究与设计
Publishing date:

Info

Title:
Effect of bolt pre-tightening force on dynamic characteristics of vibration test fixture
Author(s):
WANG Xuyang; ZHANG Lei; XU Hongwei; SONG Shaowei; ZHANG Yuntao
(Science and Technology on Liquid Rocket Engine Laboratory, Xi'an Aeropace Propulsion Institute, Xi'an 710100,China)
Keywords:
stiffness of bolted joint interface;  bolt pre-tightening force;  natural frequency;  saturated pre-tightening force
PACS:
V430
DOI:
-
Abstract:
The stiffness of bolted joint interface is closely related to the bolt pre-tightening force, which affects the dynamic characteristics of fixture and the quality of vibration test.Based on the modal test data, four finite element models of different bolt connection modes were established, and a reasonable simplified method of bolt dynamics was determined.On the basis of this, the influence rule of bolt pre-tightening force on fixture mode was investigated by combining numerical calculation, experimental verification and theoretical analysis.It was shown that the results of numerical calculation were in good agreement with the experimental results.Additionally, the change trend of the first-order overall frequency with bolt pre-tightening force in the simplified vibration test system was consistent with the numerical calculation results.The numerical results indicate that when the pre-tightening force increases from 10 kN to 45 kN, the modal shape of each stage of fixture does not change and the value of natural frequency increases logarithmically.Meanwhile, the phenomenon of saturated pre-tightening force exists under this circumstance.

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