Towards Run-time Assurance of Advanced Propulsion Algorithms

Wong, Edmond; Schierman, John D.; Schlapkohl, Thomas; Chicatelli, Amy

doi:10.2514/6.2014-3636

Cited by 14 publications

(5 citation statements)

References 19 publications

(18 reference statements)

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“…For example, RTA can be applied to a sensor fusion algorithm, a neural network flight controller or an actuation system without significant changes to the generic architecture presented in the next section. While the top-level system for which assurance is argued may be the aircraft [10], it may also simply be the propulsion system [11]. RTA may be used at the individual LRU or function or system level without necessarily affecting the trajectory of the aircraft [10].…”

Section: A Safety Of the Larger Systemmentioning

confidence: 99%

ASTM F3269 - An Industry Standard on Run Time Assurance for Aircraft Systems

Nagarajan

Kannan

Torens

et al. 2021

AIAA Scitech 2021 Forum

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This paper discusses the philosophy and editorial considerations behind the ongoing second revision of the ASTM F38 Committee standard on run time assurance for aircraft systems -ASTM F3269, titled "Standard Practice for Methods to Safely Bound Flight Behavior of Unmanned Aircraft Systems Containing Complex Functions". It describes the key aspects of the Run Time Assurance (RTA) architecture as depicted in the current revision of the standard and provides some insights on the design best practices suggested in the standard. RTA is a certification strategy for unmanned aircraft systems that contain complex functions, which may not be certifiable using traditional design assurance practices. This challenge may arise in part due to the inherent algorithmic complexity of these functions. It may also be due to the inability to produce design assurance artifacts according to industry standards such as RTCA DO-178C (software) or DO-254 (hardware) for commercial off-the-shelf components used on-board the aircraft. RTA adds value not only to unmanned applications, but also to manned aviationparticularly in General Aviation (GA) and Advanced Air Mobility (AAM). It has the potential to enable technologies for autonomous aircraft systems and simplified vehicle operations. The strategy will also play a role in the design assurance and certification of adaptive controllers and functions using artificial intelligence and machine learning algorithms.

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Section: A Safety Of the Larger Systemmentioning

confidence: 99%

ASTM F3269 - An Industry Standard on Run Time Assurance for Aircraft Systems

Nagarajan

Kannan

Torens

et al. 2021

AIAA Scitech 2021 Forum

View full text Add to dashboard Cite

show abstract

“…Then, it is extended to auto-landing flight control system that comprises adaptive and other advanced controllers [114]. National Aeronautics and Space Administration (NASA) shows great interest in RTA for the dependability and reliability of advanced propulsion control system using on-board models [112,115]. However, only very simple switch logic between the advanced controller and backup controller was designed.…”

Section: Runtime Assurance For On-board Model Dependability and Relia...mentioning

confidence: 99%

Gas turbine aero-engines real time on-board modelling: A review, research challenges, and exploring the future

Wei

Zhang

Jafari

et al. 2020

Progress in Aerospace Sciences

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“…2) Run Time Assurance for Complex Autonomy: Since there exists a growing realization that no single V&V approach will be sufficient to address all of the challenges associated with providing safety guarantees for these advanced or complex systems, it is speculated among the community that run-time monitoring or run-time verification methods can play a complementary and enabling role [42]. The basic premise makes use of "monitors" to observe the execution of an uncertified algorithm in question to insure that resulting system behavior remains constrained within acceptable bounds of stability.…”

Section: Software Reliability and Validationmentioning

confidence: 99%

Towards a New Paradigm of UAV Safety

Afman,

Ciarletta,

Feron

et al. 2018

Preprint

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With the rising popularity of UAVs in the civilian world, we are currently witnessing and paradim shift in terms of operational safety of flying vehicles. Safe and ubiquitous human-system interaction shall remain the core requirement but those prescribed in general aviation are not adapted for UAVs. Yet we believe it is possible to leverage the specific aspects of unmanned aviation to meet acceptable safety requirements. We start this paper with by discussing the new operational context of civilian UAVs. We investigate the meaning of safety in light of this new context, keeping in mind the operational and economical constraints. Next, we explore the different approaches to ensuring system safety from an avionics point of view. It mostly consists in lowering failure occurrences and managing/leveraging them. Formal verification, redundancy and fault tolerant control are discussed and weighted against the high cost of current methods used in commercial aviation. Subsets of operational requirements such as geofencing or mechanical systems for termination or impact limitation can easily be implemented. These are presented with the goal of limiting the collateral damages of a system failure. We then present some experimental results regarding two of the major problems with UAVs. With actual impacts, we demonstrate how dangerous uncontrolled crashes can be. Furthermore, with the large number of runaway drone experiences during civilian operations, the risk is even higher as they can travel a long way before crashing. We provide data on such a case where the software controller is working, keeping the UAV in the air, but the operator is unable to actually control the system. It should be terminated! Finally, after having analyzed the context and some actual solutions, based on a minimal set of requirement and our own experience, we are proposing a simple mechanical based safety system. It unequivocally terminates the flight in the most efficient way. Our Active Cutting System instantly removes parts of the propellers leaving a minimal lifting surface. It takes advantage of what controllability may remain but with a deterministic ending: a definite landing.

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Towards Run-time Assurance of Advanced Propulsion Algorithms

Cited by 14 publications

References 19 publications

ASTM F3269 - An Industry Standard on Run Time Assurance for Aircraft Systems

ASTM F3269 - An Industry Standard on Run Time Assurance for Aircraft Systems

Gas turbine aero-engines real time on-board modelling: A review, research challenges, and exploring the future

Towards a New Paradigm of UAV Safety

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