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Moment Evaluations of Gimbal Expansion Joints for Liquid Rocket Engine Propellant Pipes  

Yoo, Jaehan (미래로켓연구팀)
Moon, Ilyoon (미래로켓연구팀)
Lee, Soo Yong (미래로켓연구팀)
Choi, Chunghyeon (과학기술연합대학원대학교 발사체시스템공학)
Publication Information
Aerospace Engineering and Technology / v.12, no.1, 2013 , pp. 105-110 More about this Journal
Abstract
The gimbal expansion joint for the pipe line of a liquid rocket engine undergoes high pressure and cyclic rotational displacement loadings. In present study, the moment analyses and tests of the internal-type gimbal expansion joint for the engine were performed. The moment components due to spring stiffness, friction and lateral force were obtained using a analytic method and their sums at low and high pressures were compared with the test results. Also, applying a $MoS_2$ dry film lubricant to the pin of a external hinge expansion joint, it is tested that the galling of the pin was removed and the friction coefficient was decreased for low pressures.
Keywords
Liquid Rocket Engine; Gimbal Expansion Joints; Moment; Analysis; Test; $MoS_2$ Coating;
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  • Reference
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