Design and Demonstration of Emergency Control Modes for Enhanced Engine Performance

Liu, Yuan; Litt, Jonathan S.; Guo, Ten-Huei

doi:10.2514/6.2013-3625

Cited by 7 publications

(15 citation statements)

References 2 publications

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“…The interested reader is referred to the dedicated publication for a more complete treatment. 13 Exceeding the maximum design performance limits naturally increases the likelihood of mishap within the engine. Therefore, a basic premise for the control modes that were developed is that their design should be based on models of component failure probability.…”

Section: Control Modesmentioning

confidence: 99%

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Application and Evaluation of Control Modes for Risk-Based Engine Performance Enhancements

Liu

Litt

Sowers³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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The engine control system for civil transport aircraft imposes operational limits on the propulsion system to ensure compliance with safety standards. However, during certain emergency situations, aircraft survivability may benefit from engine performance beyond its normal limits despite the increased risk of failure. Accordingly, control modes were developed to improve the maximum thrust output and responsiveness of a generic high-bypass turbofan engine. The algorithms were designed such that the enhanced performance would always constitute an elevation in failure risk to a consistent predefined likelihood. This paper presents an application of these risk-based control modes to a combined engine/aircraft model. Through computer and piloted simulation tests, the aim is to present a notional implementation of these modes, evaluate their effects on a generic airframe, and demonstrate their usefulness during emergency flight situations. Results show that minimal control effort is required to compensate for the changes in flight dynamics due to control mode activation. The benefits gained from enhanced engine performance for various runway incursion scenarios are investigated. Finally, the control modes are shown to protect against potential instabilities during propulsion-only flight where all aircraft control surfaces are inoperable. NomenclatureAlt = altitude C-MAPSS40k = Commercial Modular Aero-Propulsion System Simulation 40k EOL = end-of-life EPR = engine pressure ratio FAA = Federal Aviation Administration FADEC = full authority digital engine control FPA = flight path angle FR = faster response Hdg = heading 2 HPC = high-pressure compressor HPT = high-pressure turbine NASA = National Aeronautics and Space Administration OT = overthrust PCA = propulsion controlled aircraft PIO = pilot-induced oscillation PLA = power lever angle Ps30 = combustor static pressure T48 = high-pressure turbine exit total temperature TO = takeoff TCM = Transport Class Model VBV = variable bleed valve VSV = variable stator vane γ = flight path angle φ = roll angle

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Section: Control Modesmentioning

confidence: 99%

“…11,12 A recent study utilized these statistical models to redesign the NASA-developed overthrust and faster response control modes such that the enhanced performance delivered is based on the elevation of failure risk to a consistent predefined level. 13 This paper documents the continuation and application of that effort.…”

Section: Introductionmentioning

confidence: 98%

Application and Evaluation of Control Modes for Risk-Based Engine Performance Enhancements

Liu

Litt

Sowers³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

Self Cite

View full text Add to dashboard Cite

show abstract

“…9,10 May et al 11 developed high-speed idle control mode which improves the transient performance by allowing the engine to operate at higher spool speed at idle state. Chin et al 5 and Liu et al 12 studied the enhanced propulsion system design in the aircraft emergency incident, and the research results show that although the enhanced propulsion control system might decrease the engine safety, it significantly improves the engine thrust and response ability that ensure safe airplane landing in emergency incidents. The above works promoted some achievements in evaluating the effect of broadening operating limits.…”

Section: Introductionmentioning

confidence: 99%

On-board real-time optimization control for turbofan engine thrust under flight emergency condition

Zheng

Miao

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part I:

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A real-time optimization control method is proposed to enhance engine thrust response and enlarge its maximum thrust during emergent flight. This real-time optimization control is model based, and the on-board engine predictive model is devised by a multi-input multi-output recursive reduced least squares support vector regression method. Two emergency engine control modes during engine emergent acceleration process, the overthrust mode and the faster response mode, are redesigned by specifying relative objective function with engine operation constraints. Namely, the overthrust mode is for getting much bigger maximum thrust, and the faster response mode is for obtaining faster engine response. In the initial engine acceleration stage, the two modes have the same objective function for fastest thrust response within necessary operation constraints. After that, the objective function varies to maximum thrust in the overthrust mode, whereas the faster response mode keeps the objective for fastest response unchanged. For solving the online optimization problem, a feasible sequential quadratic programming algorithm is utilized here. The simulation results demonstrate that, first, engine response ability can be improved in faster response mode. Second, not only more thrust was provided over the maximum value but also fast response ability was achieved in the overthrust mode. Moreover, compared to conventional operation nowadays, argumentation of compressor guided vane angle control and broadening operation restrictions were deeply studied and verified in the new schemes.

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“…1 In emergency flight, such as emergency climb, aircraft overshoot, chasing, or getting rid of enemy planes, the performance of engine acceleration is no doubt a most important index. [2][3][4][5] Moreover, it is the foundation for the research of the other transient state controls, such as deceleration process and starting process.…”

Section: Introductionmentioning

confidence: 99%

A global optimization control for turbo-fan engine acceleration schedule design

Zheng

Zhang

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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A new optimization control method, which is based on the optimization employing Bezier curves of control variables, is proposed to improve engine thrust response performance. The minimum of the time consumption for control variables changing from start to end point is selected as objective function. Unlike conventional methods, the optimization variables are altered to the Bezier curves of the control variables in this scheme. This new acceleration optimization control only establishes one optimization problem for the overall acceleration process instead of establishing a series of sub optimization problems, which is usually adopted by conventional optimization controls. Hence, the proposed method is easier to overcome the disadvantage of the conventional ones, which just search for the optimal engine performance in local time period. Finally, for comparisons, the simulations for the proposed method and the conventional one have been both conducted. The simulations demonstrate that, although the conventional optimization control shows better performance in initial half part of acceleration process, however, the overall acceleration performance turns to be worse whereas for the new one, the acceleration time from idle to 95% of the maximum power is surprising decreased by 1.4 s compared to the conventional optimization control.

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Design and Demonstration of Emergency Control Modes for Enhanced Engine Performance

Cited by 7 publications

References 2 publications

Application and Evaluation of Control Modes for Risk-Based Engine Performance Enhancements

Application and Evaluation of Control Modes for Risk-Based Engine Performance Enhancements

On-board real-time optimization control for turbofan engine thrust under flight emergency condition

A global optimization control for turbo-fan engine acceleration schedule design

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