Tests on Elastic Wheels for a Small Lunar Rover

All robotic rovers for planetary exploration and the vehicles used to carry astronauts on the surface of the Moon used wheels as running gear. The same applies to the majority of projects for future exploration missions, both for the unmanned and manned rovers. Dynamic modeling of wheeled vehicles is a common practice in automotive technology, and commercial codes are usually employed. Such dynamic modeling however requires the knowledge of the wheel-terrain interaction that is usually beyond that available for the specific type of wheels designed for planetary rovers, in particular when they operate on regolith like in the actual working conditions. Test campaigns aimed at characterizing the behavior of the specific non pneumatic, elastic but sometimes rigid, wheels designed for planetary rovers operating on specific soils simulating the terrain (the so-called planetary simulant) which can be found in the actual applications are required. A test rig that can be used to characterize the wheel-ground interaction under different operating conditions was presented at the 64th IAC. The research continued in the last year, and after the test rig was shown to work as expected, a first test campaign is now underway on the elastic wheels designed for a small lunar rover