Fault Tolerant Margins for Unmanned Aerial Vehicle Flight Safety

Ashokkumar, Chimpalthradi R.; York, George; Gruber, Scott

doi:10.1007/s10846-017-0487-8

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…In addition, as a result of China’s lack of training for operators to correctly avoid accidents and respond to emergencies, UAV operators lack the ability to respond to emergencies, which increases the probability of flight accidents. Also, the inherent flaws in the UAV operating system itself further increase the flight risks of UAVs ( 37 ).…”

Section: Theoretical Analysis Of Unsafe Behaviors’ Relationshipsmentioning

confidence: 99%

Factors Affecting Unmanned Aerial Vehicles’ Unsafe Behaviors and Influence Mechanism Based on Social Network Theory

Wang

Guo

Liu

et al. 2022

Transportation Research Record: Journal of the Transportation R

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With the widespread application of unmanned aerial vehicles (UAVs), flight safety issues have gradually become prominent. To improve the safety level of UAV flight, a conceptual model was constructed through groups of unsafe behaviors of UAV flight based on the Swiss cheese model (reason model). The relationship network model of unsafe behaviors of UAV flight was built after using the two-mode and one-mode social network analysis, and the unsafe behaviors of UAV flight influence mechanism were studied by basic characteristics of network analysis, centrality analysis, core-periphery structure analysis, in/out-degree analysis, and structural hole analysis. The results showed that the two-mode network is closely related: unreasonable safety management structure of the organization and weak supervision of UAV flight operation were those unsafe behaviors of UAV supervision that had great influence. The unsafe behaviors of UAV supervision, such as the organization’s illegal deployment of unqualified personnel for tasks and lack of ground commander for the mission plan, were in the core position of the network. The proposed model can effectively reduce the unsafe behaviors of UAV operations by eliminating critical unsafe behaviors of UAV supervision in the network and reducing UAV flight accidents.

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Section: Theoretical Analysis Of Unsafe Behaviors’ Relationshipsmentioning

confidence: 99%

Factors Affecting Unmanned Aerial Vehicles’ Unsafe Behaviors and Influence Mechanism Based on Social Network Theory

Wang

Guo

Liu

et al. 2022

Transportation Research Record: Journal of the Transportation R

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“…The above equations are guaranteed to give a unique solution, becausexðtÞ is employed at both left and right sides of equation (15a). In general, for the problem considered presently, the null space technique solves all the cases u ¼ À"Gxð ptÞ; e0 ¼ Gxð ptÞ; e1 ¼ 1 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0 ½ Gxð ptÞ; e2 ¼ 0 0 0 0 0; 0 1 0 0 0; 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0 ½ Gxð ptÞ; e3 ¼ 0 0 0 0; 0 0 0 0 0; 0 0 1 0 0; 0 0 0 0 0; 0 0 0 0 0 ½ Gxð ptÞ; e4 ¼ 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0; 0 0 0 01 0; 0 0 0 0 0 ½ Gxð ptÞ; e5 ¼ 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 0; 0 0 0 0 1 ½ Gxð ptÞ; N1 ¼ null e1 e2 e3 e4 e5 À ðe0 uÞ ½ ð Þ ½ which can be recognized by using the solution it offers (see literature 1,19,20 for details). The technique is particularly attractive to determine sensor fault size.…”

Section: Fault Detection and Quantificationmentioning

confidence: 99%

“…Majority of these developments in the past can be applied in the present context with the FTMs, and for each fault type within the range of FTM, the positive definite and semi definite symmetric matrices will suggest the tolerable noise level for which the controller and observer would remain stable. That is, the FTMs of these controllers 19,20 and observers 24 would not vary; however, their tolerance to noise levels is explicitly known. Figure 1 depicts the usefulness of the FTMs as a threshold in the context of fault tolerant control and diagnosis and prognosis algorithms.…”

Section: Noisementioning

confidence: 99%

“…The above equations are guaranteed to give a unique solution, because x^(t) is employed at both left and right sides of equation (15a). In general, for the problem considered presently, the null space technique solves all the cases which can be recognized by using the solution it offers (see literature 1,19,20 for details). The technique is particularly attractive to determine sensor fault size.…”

Section: Fault Detection and Quantificationmentioning

confidence: 99%

See 1 more Smart Citation

Adaptive fault tolerant control for reconfigurable systems

Ashokkumar

York

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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Reconfigurable systems are the safe dynamical systems wherein the health of the control input and/or sensor output variables are continuously monitored and then they are reconfigured, if necessary, in an event of an unexpected fault detected online. This idea is applied, in particular, at the reconfigurable system where the number of control variables is more than the state variables considered to define its motion. In this paper, an adaptive pole placing controller is developed for use in such reconfigurable systems. Adaptive pole placing controller, in theory, is adaptive to take a fault size and retain the closed loop poles it assigns at fixed locations in the open left half plane of the complex plane. As a result, when the controller is not adaptive, it means that the pole perturbations could lead to catastrophes. However, to design adaptive pole placing controller for a reconfigurable system, fault size is required. Hence, the primary objective of the paper is to present a simple procedure that determines the fault size for tuning in the adaptive pole placing controller. Both direct and full-order Luenberger observer based state feedback adaptive pole placing controllers are presented. In situations where the adaptive pole placing controller is not possible, the fault size for which the reconfigurable system with a non-adaptive pole placing controller would transit from a stable to unstable system (referred as fault tolerant margin with respect to the non-adaptive pole placing controller) is also presented. Some of these features of this paper are illustrated by using the reconfigurable aircraft model available in the literature.

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