Affiliations: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang-city, Gyeonggi-do, Korea
Correspondence:
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Corresponding author: Jae-Sung Bae, School of Aerospace and Mechanical Engineering, Korea Aerospace University, 200-1 Hwajeon-dong, Deogyang-gu, Goyang-city, Gyeonggi-do, 412-791 Korea. E-mail:jsbae@kau.ac.kr
Abstract: In the present study, an electromagnetic shock-absorber (EMSA) is proposed
for a landing structure of a spaceship. The proposed EMSA consists of a
copper and steel combined tube, a piston, permanent magnets, and a steel
ring. A magnet fixed on the piston is designed to move through the tube when
driven by an external shock. Shock energy is partially dissipated by an eddy
current damping force and a friction force generated from the relative
motion of the tube and the magnet. Some of the energy is stored in a
magnetic spring consisting of two magnets in which their poles act against
each other. To investigate and predict the performance of the proposed EMSA
these damping and magnetic forces are simulated and approximated by using an
electromagnetic finite element program. Their approximations are verified by
experimental results and the numerical model of the proposed EMSA is
consequently developed. The proposed EMSA is fabricated and its performance
is predicted and verified by the drop test.
Keywords: Electromagnetic shock absorber (EMSA), eddy current damping (ECD), friction, attractive and propulsive magnetic force
