Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty

Gianluca Filippi, Daniel Krpelik, Peter Zeno Korondi, Massimiliano Vasile, Mariapia Marchi, Carlo Poloni

Research output: Contribution to conferencePaper

Abstract

The paper introduces the concept of design for resilience in the context of space systems engineering and proposes a method to account for imprecision and epistemic uncertainty. Resilience can be seen as the ability of a system to adjust its functioning prior to, during, or following changes and disturbances, so that it can sustain required operations under both expected and unexpected conditions. Mathematically speaking this translates into the attribute of a dynamical system (or time dependent system) to be simultaneously robust and reliable. However, the quantification of robustness and reliability in the early stage of the design of a space systems is generally affected by uncertainty that is epistemic in nature. As the design evolves from Phase A down to phase E, the level of epistemic uncertainty is expected to decrease but still a level of variability can exist in the expected operational conditions and system requirements. The paper proposes a representation of a complex space system using the so called Evidence Network Models (ENM): a non-directed (unlike Bayesian network models) network of interconnected nodes where each node represents a subsystem with associated epistemic uncertainty on system performance and failure probability. Once the reliability and uncertainty on the performance of the spacecraft are quantified, a design optimisation process is applied to improve resilience and performance. The method is finally applied to an example of preliminary design of a small satellite in Low Earth Orbit (LEO). The spacecraft is divided in 5 subsystems, AOCS, TTC, OBDH, Power and Payload. The payload is a simple camera acquiring images at scheduled times. The assumption is that each component has multiple functionalities and both the performance of the component and the reliability associated to each functionality are affected by a level of imprecision. The overall performance indicator is the sum of the performance indicators of all the components.
LanguageEnglish
Pages1-13
Number of pages1
Publication statusPublished - 5 Oct 2018
Event69th International Astronautical Congress - Bremen, Germany
Duration: 1 Oct 20185 Oct 2018
Conference number: 69th

Conference

Conference69th International Astronautical Congress
Abbreviated titleIAC 2018
CountryGermany
CityBremen
Period1/10/185/10/18

Fingerprint

Aerospace engineering
Systems engineering
Spacecraft
Bayesian networks
Dynamical systems
Orbits
Earth (planet)
Cameras
Uncertainty
Satellites

Keywords

  • epistemic uncertainty
  • resilient satellite
  • complex systems
  • evidence theory

Cite this

Filippi, G., Krpelik, D., Korondi, P. Z., Vasile, M., Marchi, M., & Poloni, C. (2018). Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty. 1-13. Paper presented at 69th International Astronautical Congress, Bremen, Germany.
Filippi, Gianluca ; Krpelik, Daniel ; Korondi, Peter Zeno ; Vasile, Massimiliano ; Marchi, Mariapia ; Poloni, Carlo. / Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty. Paper presented at 69th International Astronautical Congress, Bremen, Germany.1 p.
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Filippi, G, Krpelik, D, Korondi, PZ, Vasile, M, Marchi, M & Poloni, C 2018, 'Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty' Paper presented at 69th International Astronautical Congress, Bremen, Germany, 1/10/18 - 5/10/18, pp. 1-13.

Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty. / Filippi, Gianluca; Krpelik, Daniel; Korondi, Peter Zeno; Vasile, Massimiliano; Marchi, Mariapia; Poloni, Carlo.

2018. 1-13 Paper presented at 69th International Astronautical Congress, Bremen, Germany.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty

AU - Filippi, Gianluca

AU - Krpelik, Daniel

AU - Korondi, Peter Zeno

AU - Vasile, Massimiliano

AU - Marchi, Mariapia

AU - Poloni, Carlo

PY - 2018/10/5

Y1 - 2018/10/5

N2 - The paper introduces the concept of design for resilience in the context of space systems engineering and proposes a method to account for imprecision and epistemic uncertainty. Resilience can be seen as the ability of a system to adjust its functioning prior to, during, or following changes and disturbances, so that it can sustain required operations under both expected and unexpected conditions. Mathematically speaking this translates into the attribute of a dynamical system (or time dependent system) to be simultaneously robust and reliable. However, the quantification of robustness and reliability in the early stage of the design of a space systems is generally affected by uncertainty that is epistemic in nature. As the design evolves from Phase A down to phase E, the level of epistemic uncertainty is expected to decrease but still a level of variability can exist in the expected operational conditions and system requirements. The paper proposes a representation of a complex space system using the so called Evidence Network Models (ENM): a non-directed (unlike Bayesian network models) network of interconnected nodes where each node represents a subsystem with associated epistemic uncertainty on system performance and failure probability. Once the reliability and uncertainty on the performance of the spacecraft are quantified, a design optimisation process is applied to improve resilience and performance. The method is finally applied to an example of preliminary design of a small satellite in Low Earth Orbit (LEO). The spacecraft is divided in 5 subsystems, AOCS, TTC, OBDH, Power and Payload. The payload is a simple camera acquiring images at scheduled times. The assumption is that each component has multiple functionalities and both the performance of the component and the reliability associated to each functionality are affected by a level of imprecision. The overall performance indicator is the sum of the performance indicators of all the components.

AB - The paper introduces the concept of design for resilience in the context of space systems engineering and proposes a method to account for imprecision and epistemic uncertainty. Resilience can be seen as the ability of a system to adjust its functioning prior to, during, or following changes and disturbances, so that it can sustain required operations under both expected and unexpected conditions. Mathematically speaking this translates into the attribute of a dynamical system (or time dependent system) to be simultaneously robust and reliable. However, the quantification of robustness and reliability in the early stage of the design of a space systems is generally affected by uncertainty that is epistemic in nature. As the design evolves from Phase A down to phase E, the level of epistemic uncertainty is expected to decrease but still a level of variability can exist in the expected operational conditions and system requirements. The paper proposes a representation of a complex space system using the so called Evidence Network Models (ENM): a non-directed (unlike Bayesian network models) network of interconnected nodes where each node represents a subsystem with associated epistemic uncertainty on system performance and failure probability. Once the reliability and uncertainty on the performance of the spacecraft are quantified, a design optimisation process is applied to improve resilience and performance. The method is finally applied to an example of preliminary design of a small satellite in Low Earth Orbit (LEO). The spacecraft is divided in 5 subsystems, AOCS, TTC, OBDH, Power and Payload. The payload is a simple camera acquiring images at scheduled times. The assumption is that each component has multiple functionalities and both the performance of the component and the reliability associated to each functionality are affected by a level of imprecision. The overall performance indicator is the sum of the performance indicators of all the components.

KW - epistemic uncertainty

KW - resilient satellite

KW - complex systems

KW - evidence theory

M3 - Paper

SP - 1

EP - 13

ER -

Filippi G, Krpelik D, Korondi PZ, Vasile M, Marchi M, Poloni C. Space systems resilience engineering and global system reliability optimisation under imprecision and epistemic uncertainty. 2018. Paper presented at 69th International Astronautical Congress, Bremen, Germany.