Hopper-Flow of Lunar Regolith Simulants in Reduced Gravity and Vacuum

Technische Universitat Munchen, Philipp Hager, Alexander Hoehn, Institute of Astronautics.Paper 78057_0

Technology Business

7th Regional Americas Conference of the International Society for Terrain-Vehicle Systems
05 November 2013 | Tampa, Florida

Institute of Astronautics
Technische Universität München

Hopper-Flow of Lunar Regolith Simulants
in Reduced Gravity and Vacuum

Philipp Reiss, Philipp Hager, Alexander Hoehn
Institute of Astronautics
Technische Universität München
p.reiss@tum.de

05 November 2013
7th Regional Americas Conference of the ISTVS
Tampa, Florida

1

7th Regional Americas Conference of the International Society for Terrain-Vehicle Systems

Institute of Astronautics
Technische Universität München

05 November 2013 | Tampa, Florida

Flowability Parameters
Sample mass
Sample material

27 to 46 g

JSC-1A / NU-LHT-2M

Ambient pressure
0.07 to 6.10 mbar

Inclination angle of funnel
55 / 60 / 65 / 70 / 75 deg

Gravitation
1.00 / 0.38 / 0.16 g

Outlet width of funnel
8 / 13 / 18 mm

Funnel geometry
Symmetrical / asymmetrical
Pre-consolidation
Wall friction

Electrostatic charge

Vibration

Moisture

3

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Journal of Terramechanics, October 2015

Analog Field Testing Opportunities in Hawai`i Paper82613

This document summarizes analog field testing opportunities for space exploration in Hawaii. It describes Hawaii as a terrestrial analog for Mars and the moon due to its diverse geology and terrain. It provides a timeline of previous analog tests conducted by NASA, the Canadian Space Agency, and the German Aerospace Center between 2008-2012. These tests involved rovers, drills, oxygen production systems and other technologies on two analog sites on Mauna Kea to simulate lunar and Martian missions. It outlines the assets that make Hawaii a premier location for continued analog field testing.

Design of a High Traction Flexible Wheel for the Next Generation of Manned Lu...

This document summarizes the design of a flexible wheel for lunar rovers. Requirements included withstanding lunar environmental conditions while providing traction, control and comfort. A terramechanics approach was used to model wheel performance. A mass-spring-damper dynamic model was developed. Multiple concept designs were generated and converged. A prototype was built and tested, showing vertical stiffness higher than required, comparable damping to tires, and lateral stiffness needing improvement. Drawbar pull predictions matched experimental results, validating the model. Further optimization of geometric parameters will improve performance.

Comparison of DEM and Traditional Modeling Methods for Simulating Steady-Stat...

Off-Road Soft Soil Tire Model Development, Validation, and Interface to Comme...

3D Road Profiling Using Stereography Paper80963

The document presents a method for 3D road profiling using stereography. Current techniques use static sensors or dynamic vehicle-mounted sensors combined with an IMU/INS system. The presented method uses stereography to capture overlapping 3D point grids at each sample, which are pieced together using feature tracking and registration techniques. This reduces the need for a high-accuracy, expensive IMU/INS system. The method is shown to provide reasonable accuracy for road profiling using inexpensive cameras.

Development of a Laboratory Based Dynamic Friction Tester Paper83026

A Terradynamics for Legged Locomotion on Granular Media

Real-time non-linear vehicle dynamics preview model