Database Building and Interpolation for an Online Safe Flight Envelope Prediction System

Zhang, Y.; Visser, Coen C. de; Chu, Qi

doi:10.2514/1.g003834

Cited by 22 publications

(17 citation statements)

References 18 publications

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“…The simulation environment is called "DASMAT", which is the abbreviation of "Delft University Aircraft Simulation Model and Analysis Tool". The Cessna Citation aircraft model and DASMAT have been used in our previous papers on flight envelope calculation, damage modeling and classification [10,11]. In this paper, databases of flight envelopes [11] are built in the form of look-up tables and incorporated in the DASMAT.…”

Section: Case Study and Simulation Resultsmentioning

confidence: 99%

“…The implementation of a flight envelope prediction system, which includes system identification, fault/damage diagnosis and database building has been thoroughly discussed in [10,11]. However, none of these have practical meaning if they are not connected and running in-the-loop with an FTC.…”

Section: Online Implementationmentioning

confidence: 99%

“…Additionally, reports on past flight accidents reveal that rudder and vertical tail damage is often accompanied, or induced by sudden external disturbances and turbulence, when the rudder deflects to re-trim the aircraft. For the online identification process, the recursive least squares (RLS) method has been implemented [11,18]. At each time instant, the covariance matrix gives some information of the reliability of the re-identified model parameters, which is closely related to the sufficiency of each state input.…”

Section: A Rudder Damagementioning

confidence: 99%

“…An online flight envelope prediction system developed in our previous research [10,11] addressed this problem by building a database of various key abnormal cases with their associated changed flight envelopes. The proposed system considerably reduces the computational burden and circumvents many complications related to online flight envelope prediction.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike open-loop configurations discussed in previous papers, the proposed envelope protection system functions in closedloop, combining system identification, learning-based diagnosis, database-driven envelope prediction and fault tolerant control. The advantage of this modular design is that only envelopes that are explicitly referred to by the system need to be retrieved from the database, and the re-design of the overall protection and control system is not necessarily needed [11]. Being connected to a scalable database, resiliency can be achieved in various abnormal situations that can be modeled a priori.…”

Section: Introductionmentioning

confidence: 99%

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Database-driven Safe Flight Envelope Protection for Impaired Aircraft

Zhang

Huang

Chu

et al. 2020

AIAA Scitech 2020 Forum

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In this paper, an online flight envelope protection system is developed and implemented on impaired aircraft with structural damage. The whole protection system is designed to be a closed-loop of several subsystems , including system identification, damage classification, flight-envelope prediction and fault-tolerant control. Based on the information given by damage classification, the flight envelopes are explicitly retrieved and processed online from the database and fed into the fault-tolerant controller, which makes the protection system adaptive to a wide range of abnormal conditions. Simulation results show that with envelope protection, loss-ofcontrol accidents are more likely to be prevented, since both the controller and pilots are aware of the shrunken flight envelopes after damage and excessive commands are restricted. In this way, the fault-tolerance of the impaired aircraft can be effectively enhanced.

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Section: Case Study and Simulation Resultsmentioning

confidence: 99%

Section: Online Implementationmentioning

confidence: 99%

Section: A Rudder Damagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Database-driven Safe Flight Envelope Protection for Impaired Aircraft

Zhang

Huang

Chu

et al. 2020

AIAA Scitech 2020 Forum

View full text Add to dashboard Cite

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Reachability problem considering running cost

Liao

Wei

Lai

2021

Asian Journal of Control

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In this paper, we generalize the definition of reachable set. The classic definition of reachable set is a set of system states that can be driven into the target set within a given time horizon. Sometimes, the concern of researchers is not the time consumption but some other form of cost of driving the system state toward the target set. Under this background, the definition of cost‐limited reachable set is put forward in this paper. In this definition, the cost is the time integral of some form of running cost, and the running cost can be a function of system state and control input. By introducing a value function, a method to compute the cost‐limited reachable sets is proposed. In this method, the value function is approximated using recursion and interpolation. Then the cost‐limited reachable sets can be characterized by a family of level sets of the value function. At the end of this paper, some examples are taken to illustrate the validity and accuracy of the proposed method.

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