Abstract
To enable effective management, planning, and operations for future missions that involve a crewed space habitat, operational support must be migrated from Earth to the habitat. Intelligent System Health Management technologies (ISHM) promise to enable the future space habitats to increase the safety and mission success while minimizing operational risks. In this paper, Water Recycling System (WRS) deployed at NASA Ames Research Center's Sustainability Base is used for verification and validation of the proposed solution. Our work includes the development of the WRS simulation model based on its dynamic physical characteristics and the design of Automatic Contingency Management (ACM) framework that integrates fault diagnosis and optimization. In WRS modeling, a nominal model with fault injectors is developed. Fault detection and isolation techniques are then developed for isolating causes and identifying the severity of the faults. Dynamic Programming (DP) based fault mitigation strategies are designed to accommodate the faults in the system. A series of simulations are presented with different fault modes and the results indicate that the proposed ACM system can alleviate the fault in the WRS optimally regarding energy consumption and effects of the fault.
Highlights
Most of the planning and management of space operations are conducted locally on earth, limiting real-time input from crewmembers during space missions
An automated contingency management solution is developed and the Water Recycling System (WRS) in NASA Ames Sustainability Base is used as a testbed for verification and validation
Dynamic programming and a PID-based fault mitigation strategy are introduced in the proposed Automatic Contingency Management (ACM) system for comparison studies
Summary
Most of the planning and management of space operations are conducted locally on earth, limiting real-time input from crewmembers during space missions. Space habitat crew personnel can be given the opportunity to manage, plan and operate much of the missions themselves, by migrating operational support from Earth to the original habitat in space. This task will require significant automation and decision support software, which will benefit a small sized crew, by enabling new monitoring, tracking, and management capabilities onboard the habitat and related Extravehicular Activity platforms. Advances in intelligent health management technologies increase mission safety and success while minimizing the operational risks and costs. This innovation is essential to future habitats stationed on other planets, asteroids, or lunar surfaces. ACM (Saxena et al, 2007) strategies, which include sensing, fault detection, diagnosis, prognosis, and decision-making for fault mitigation are needed
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