title: Ultrasonic rock sampling using longitudinal-torsional vibrations.
abstract: In the last years several European and US space projects have been focused on the development of surface rovers for planetary missions, such as ExoMars and Mars Exploration Rovers. The main function of these vehicles consists of moving across planet surfaces, and drilling and retrieving samples for in situ analysis. Recent research has shown that drilling of rock materials can be achieved using axially oscillating tuned devices which, compared with conventional rotary drills, operate at lower power and highly reduced preload requirements. As a result, at present, ultrasonics is considered a very promising technology for exobiological prospecting. In this work, two novel ultrasonic rock samplers, both operating in a longitudinal-torsional composite mode, are proposed along with the conceptual design of a full coring apparatus, for preload delivery and core removal. To assess the penetration capability of the excited composite vibrations, preliminary drilling trials were conducted. Since sand constitutes a significant portion of the Martian surface, sandstone was used in the trials.
authors.affiliation: Department of Mechanical Engineering, University of Glasgow, Glasgow G12 8QQ, UK. a.cardoni@mech.gla.ac.uk
authors.forename: Andrea
authors.initials: A
authors.lastname: Cardoni
authors.forename: Patrick
authors.initials: P
authors.lastname: Harkness
authors.forename: Margaret
authors.initials: M
authors.lastname: Lucas
mesh_terms: D005118:Extraterrestrial Environment; D008903:Minerals / Q000032:analysis; D008906:Mining / Q000379:methods*; D008961:Models, Structural; D014465:Ultrasonics; D014732:Vibration
chemical_list: D008903:Minerals