Welcome to the ISS Longeron Challenge! 

This project has been completed.

The project was completed using 3 challenges and included 78 registrants from 21 different countries.

The primary objective of the project involved positioning the solar collectors on the International Space Station to generate as much power as possible during the most difficult orbital positions. The solar collectors are arranged in two groups of four Solar Array Wings (SAW). Each group is rotated by a joint called a Solar Alpha Rotary Joint (SARJ). Within each group, each of the four SAWs is rotated by a joint called a Beta Gimbal Assembly (BGA). The winning solution specified the angular position and velocity of these ten joints at each minute of the 92 minute orbit.

Longerons are the four long components of the SAW’s mast. If a longeron is shadowed for a period of time it will cool and shrink. If some longerons shrink while others do not, this may stress the longerons and weaken them. This weakening would eventually lead to the failure of the mast so this must be avoided at all cost.

Members were provided with a CAD model which specifies the simplified geometrical model of the ISS which is used the scoring calculations. In addition to the CAD model, members were provided with the detailed dimensions of how the solar collectors are arranged on each SAW.