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Dr. Meyer Nahon, Dept. of Mechanical Engineering and Center for Intelligent Machines, McGill Univ.
Modeling Arecibo's Multi-Tethered Feed Subsystem

This presentation discusses a computer and mathematical model of the dynamics of the tethered subsystem of the Arecibo Radio Telescope, including the cables, towers, and feed platform. The model formulates the dynamic equations governing the motion of each component, as well as the forces acting on them; and uses these equations to predict the motion of the feed in different wind conditions.

A set of performance metrics of the Arecibo Radio Telescope is defined and these metrics are evaluated under a variety of wind speeds, directions, and turbulent conditions. The general configurations of the Arecibo Radio Telescope, before and after its two major upgrades, are also compared.

Finally, a sensitivity analysis is carried out in order to identify which physical parameters of the system, if changed or redesigned, could improve the system's performance. The following six parameters are investigated: number of mainstay cables, tower radius (cable length), effective tower stiffness (number of backstay cables), platform mass, cable-platform attachment points, and mainstay cable properties.