Aerospace and Electronic Systems - May 2019 - 43
roving vehicles like SPRITE [3] and permanent base envisioned under the Constellation program [4], this paper
assumes sortie missions with a modest increase in landing
mass and surface duration compared to the Apollo missions
with the use of inflatable structures [5]. One of the assumed
capabilities of these missions is having two rovers on the
lunar surface. This will be a critical development because it
will eliminate the walk-back constraint on lunar surface
exploration, dramatically increasing the reachable exploration area. This paper details the conceptual design of a
system that can be integrated into the design of these lunar
rovers to significantly increase exploration and scientific
Figure 1.
Proposed emergency mitigation system shown on the Apollo
Lunar Roving Vehicle. The system consists of a (1) sublimator/
evaporator, (2) 2 CO2 scrubbers, (3) an O2 tank, (4) a H2 O tank,
(5) batteries, and (6) inflatable emergency shelter in its inflated
configuration.
MAY 2019
capabilities with a modest increase in system mass,
volume, and power.
TOP-LEVEL SYSTEM DESIGN OVERVIEW
The system presented herein, called the "emergency system," is aimed at mitigating mission risk and increasing
system tolerance limitations during lunar surface exploration in open, unpressurized rovers. It was developed to
mitigate risks associated with the use of space-resilient
inflatable structures as possible bases during sortie Moon
missions [6] by providing a proposed design that utilizes
the rover itself, rather than the base, as an emergency system. This section provides a brief design overview of the
emergency system, for which detailed subsystem specifications are presented in Section "EMERGENCY PASSENGER CHAIR DESIGN."
The first significant subsystem of the emergency mitigation system is an inflatable structure, shown in its
inflated, deployed configuration in Figure 1. This inflatable structure stows around the passenger seat of the rover
and can be quickly inflated to provide a safe, habitable
volume for an astronaut in the case of a suit puncture or
other loss of suit environmental control.
The second subsystem is an ECLSS on the lunar rover
that essentially replicates the functionality of the space suit
portable life support system (PLSS). The rover ECLSS contains a sublimator (or evaporator) to reject excess heat, two
CO2 scrubbing cartridges to remove carbon dioxide from the
atmosphere, a "slurper" to remove humidity from the atmosphere, an oxygen tank to supply oxygen for respiration,
IEEE A&E SYSTEMS MAGAZINE
43
Aerospace and Electronic Systems - May 2019
Table of Contents for the Digital Edition of Aerospace and Electronic Systems - May 2019
Contents
Aerospace and Electronic Systems - May 2019 - Cover1
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