Small lunar lander/hopper performance analysis

Akil J. Middleton, S. Paschall, B. Cohanim
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引用次数: 8

Abstract

The goal of this paper is to describe a first-order performance analysis of a lunar hopper 1,2. A hopper is a vehicle that has both landing and surface mobility capabilities on a single platform. Unlike rovers, which traverse the lunar surface while in contact with the ground, hopping reuses the landing propulsion system to lift back off again and “hop” over the lunar terrain. Hopping, as a form of surface mobility, is a novel concept. As such, analysis must be performed to assess how it would fit with an overall lunar landing system architecture. Two trajectory categories are investigated to perform this assessment: the ballistic hop, where the vehicle launches itself into a ballistic trajectory toward the destination, and the hover hop, in which the vehicle ascends and maintains a constant altitude as it travels toward its desired location. Initially, parametric studies of the ballistic and hover hop are carried out in order to make observations about the performance of each hop. Using this data, it is possible to investigate the fuel-optimal hop trajectory. The delta-V costs for the ballistic and hover hops are compared for hop distances between 500 meters and 5000 meters, and in this range it is found that the ballistic hop and hover traverse have comparable delta-V costs. For the entire hop maneuver, however, the hover hop will always be the more delta-V expensive option due to the ascent and descent phases. Nevertheless, this does not rule out the hover hop as a feasible option due to its operational advantages over the ballistic hop.
小型月球着陆器/料斗性能分析
本文的目的是描述月球料斗1,2的一阶性能分析。料斗是一种在单一平台上同时具备着陆和地面机动能力的车辆。与探测车在与地面接触的情况下穿越月球表面不同,“跳跃”重复使用着陆推进系统,再次将其抬起,并在月球地形上“跳跃”。跳跃作为地面移动的一种形式,是一个新颖的概念。因此,必须进行分析,以评估它如何与整个登月系统架构相适应。为了进行评估,研究了两种轨迹类别:弹道跳跃,飞行器将自己发射到弹道轨道上,朝向目的地,以及悬停跳跃,飞行器上升并保持恒定的高度,当它向目标位置移动。首先,进行了弹道跳跃和悬停跳跃的参数研究,以观察每一次跳跃的性能。利用这些数据,可以研究燃料最优跳跃轨迹。在500米和5000米的跳跃距离范围内,比较了弹道跳跃和悬停跳跃的δ v成本,发现在这个范围内,弹道跳跃和悬停飞行具有相当的δ v成本。然而,对于整个跳跃操作来说,由于上升和下降阶段的原因,悬停跳跃总是δ - v更昂贵的选择。然而,这并不排除悬停跳跃作为一种可行的选择,因为它的操作优势比弹道跳跃。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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