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<title>AAS 98-105</title><body BGCOLOR="ffffff"> <h2>AAS 98-105</h2> <h2>ON THE DEPLOYMENT OF AN ELECTRODYNAMIC TETHER FROM AN ELLIPTICAL ORBIT</h2> <h4>M. Ruiz, J. Pelaez - Universidad Politecnica de Madrid, Spain</h4> <h2> Abstract </h2> A two-phase deployment scheme allows a long tether to be deployed from a circular LEO in less than one period. Through a perturbation method, PDE's become ODE's allowing phase-plane study to achieve a local vertical final figure. With two or even one term, the method is nearly as accurate as finite differences or lumped-mass methods, and much faster. In an elliptical orbit, the method allows a wide exploration of parameters: eccentricity, initial anomaly, ejection angle and exponential speed ratio. Ranges are identified to obtain the straight vertical figure, avoid slackness, rotation, resonances, and high sensitivity to initial conditions. <P><A HREF="http://www.space-flight.org/AAS_meetings/1998_winter/sessions.html">Back</A>