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 dr iven 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.
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