GrabCAD 模型信息
RASSOR drum challenge · 模型 267765
The design I’ve submitted for the RASSOR challenge is intended to be constructed from 3D printed titanium for the drum body and flat carbon fiber for the end plates for ease of construction. Due to the low gravity environment found on the Moon, I provided a full 180° rotation before the scoop flutes end, as well as a small angled lip intended to prevent previously gathered regolith from spilling out as the scoops begin to engage on the next rotation. A 270° or even 360° rotation for each flute was considered, but it was decided that this likely wouldn’t increase capacity enough to justify the increase in weight. Instead, I believe that continuing to rotate the drum until the rover reached the dump site would help contain the excavated regolith without adding weight. With no provisions for a drive system, this provides an interior volume of approximately 43 liters and a weight of 4.1 kg at the design limits of 450 mm diameter and 360 mm in length. When running a stress simulation of the assembly, it was assumed that a full load of regolith would be present in the drum and the full weight of that load would be exerted on the carbon fiber end plate at the end of the drum (this simulation was run without gravitation forces accounted for due to the inability to alter the gravitation constant for the simulation). With a density of about 1.5 g per cm3 for lunar regolith and a 360 mm lever arm, this works out to a force of about 23.2 kgf or 228 N. By using fixed constraints on the face of one of the end plates, the simulation calculated a minimum safety factor of 15, indicating the possibility of reducing mass without affecting performance if needed or to simply reduce launch and landing costs. A proof of concept model has also been made, in this case 3D printed out of PLA with a 100 mm outside diameter, an overall length of 99 mm and an internal volume of about A little over 430 cc. When testing the original design, which had a scoop throat height of about 6 mm, it was found that the diatomaceous earth used as an easily available lunar regolith substitute clogged without being properly funneled into the interior volume. To try to fix this, a second proof of concept was made with the same outside dimensions and an increased scoop throat height of about 11 mm and a reduced interior volume of around 320 cc, which resulted in about 340 grams being transferred during a second test using playground sand as a better lunar regolith simulant. At a density of 1.6 gram...
- 格式
- Other、STEP / IGES、Rendering
- 分类
- Aerospace
- 标签
- 未标注
- 数据更新
- 2026-11-04T05:18:46Z