Dynamic Transition to Fallback Operation of Material Circulation Control in Advanced Life Support System using Hierarchical Autonomous Control Method

摘要

Advanced life support systems (ALSs) are designed to recycle and circulates materialswithin a living environment, and are expected to eventually make it possible to sustain life inouter space. This study addresses a subsystem that recycles the elements of carbon,hydrogen, and oxygen, with planned functions that include waste recycling and foodproduction. We have previously proposed a procedure for such a system that combinesautomatic scheduling generation and multi-agent learning control and is based on ahierarchical control method. In this study, this procedure is used to simulate materialcirculation subsequent to the malfunction of a processor in the ALS that renders theprocessor inoperable. Specifically, a six-day simulation was carried out during which a wasteprocessor stopped operating during the fourth day and remained inoperative. The resultsindicated that while the upper control layer did not have to carry out rescheduling, therewas a time lag on the lower control layer. However, the lower control layer responded to thenew environment in time to restore proper control.