Robust Control for Unstart Recovery in Hypersonic Vehicles

Brocanelli, Marco; Gunbatar, Yakup; Serrani, Andrea; Bolender, Michael A.

doi:10.2514/6.2012-4698

Cited by 21 publications

(4 citation statements)

References 5 publications

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“…The scramjet is used as the power system of the AHV. If the evasion maneuver occurs in the longitudinal plane, the sharp change of attitude angle and angular velocity will affect the working state of scramjet [34,35]. Lateral maneuver can be carried out at a fixed altitude and fixed speed to avoid the impact on the attitude angle and angular velocity due to changes in speed and altitude during evasion.…”

Section: Remarkmentioning

confidence: 99%

Evasion guidance for air-breathing hypersonic vehicles against unknown pursuer dynamics

Tian

Cai

2021

Neural Comput & Applic

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The rapid development of hypersonic vehicles has motivated the related research dramatically while the evasion of the hypersonic vehicles becomes one of the challenging issues. Different from the work based on the premise that the pursuers’ information is fully known, in this paper the evasion guidance for air-breathing hypersonic vehicles (AHVs) against unknown pursuer dynamics is studied. The gradient descent is employed for parameter estimation of the unknown dynamics of the pursuer. The energy-optimized evasion guidance algorithm is further developed by taking the acceleration constraint and energy optimization into consideration. Under the proposed algorithm, the system can deal with the unknown pursuer dynamics effectively and provide more practical guidance for the evasion process. The simulation results show that the proposed method can enable the AHV to achieve successful evasion.

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Section: Remarkmentioning

confidence: 99%

Evasion guidance for air-breathing hypersonic vehicles against unknown pursuer dynamics

Tian

Cai

2021

Neural Comput & Applic

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“…Remark 2: There are many practical engineering systems that can be described or transformed as the system(1), such as, the hypersonic vehicle system [10] and the ultrasonic motor system [11], and so on. Furthermore, most practical engineering systems always subject to input saturation, output/state constraints and tracking performance constraints, for example, the permissible flight envelope of hypersonic vehicles is very narrow [52], which in turn requires the flight states to be regulated within some specific ranges.…”

Section: Problem Formulation and Preliminariesmentioning

confidence: 99%

Low-Complexity Adaptive Tracking Control for Unknown Pure Feedback Nonlinear Systems With Multiple Constraints

Chen

Wang

et al. 2019

IEEE Access

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A low-complexity adaptive tracking control strategy for a class of pure feedback nonlinear systems is developed in the presence of completely unknown non-affine nonlinearities, prescribed tracking performance constraints, full states constraints, and input saturation constraint. To handle the input saturation nonlinearity and the constrained states without pre-calculating the bound of virtual controllers, a new coordinate transformation approach is presented with an arctangent function and an auxiliary first-order dynamics. Subsequently, to deal with the completely unknown non-affine nonlinearities and the problem of prescribed performance, an inverse hyperbolic tangent function and a Nussbaum function are introduced at each step of back-stepping design, which can guarantee the control errors to vary with prescribed performance functions in time and avoid the ''explosion of complexity'' issue simultaneously. Then, an adaptive controller is derived from the recursive design procedure without the use of any approximators. The semi-globally uniformly ultimate boundedness of all signals in the closed-loop system and the satisfaction of all constraints are rigorously proved through Lyapunov stability analysis. Finally, the simulation studies on a hypersonic flight vehicle system are worked out to demonstrate the effectiveness and the applicability of the investigated approach. INDEX TERMS Pure feedback nonlinear systems, low-complexity adaptive control, full state constraints, input saturation, prescribed performance.

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“…Although previous studies have not investigated flight dynamics across the ram-scram boundary, Bolender et al [1,2] investigated the flight dynamics of inlet unstart, which has many similarities. In the case of unstart, the forces on the vehicle also undergo a rapid change, and the stability properties are also affected.…”

Section: Introductionmentioning

confidence: 98%

Flight Mechanics of Ram-Scram Transition

Dalle

Driscoll

2013

AIAA Atmospheric Flight Mechanics (AFM) Conference

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Among known air-breathing propulsion systems, the system that can be operated over the widest range of flight Mach numbers is the dual-mode ramjet-scramjet. In such an engine, either subsonic combustion or supersonic combustion can occur in a shared flowpath, and the mode of operation is determined by the flight condition and control inputs. Recent research has indicated that the steadystate thrust of such an engine is discontinuous across the transition from one mode to the other. This work discusses evidence for that discontinuity and discuss conditions and strategies required to maintain control through ram-scram transition. Nomenclature a = acceleration A = duct area c p = specific heat at constant pressure C L = lift coefficient C D = drag coefficient I = impulse function K = drag polar coefficient m f = cumulative fuel consumptioṅ m = mass floẇ m f = fuel mass flow rate M = Mach number p = pressure q ∞ = freestream dynamic pressure Q f = specific fuel heat release R = normalized gas constant S = reference area t = time T = temperature u = total flow speed u = vector of control variables V = velocity of vehicle x = vector of state variables γ = ratio of specific heats, flight path angle η c = combustion efficiency ρ = density τ = temporal integration variable

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Robust Control for Unstart Recovery in Hypersonic Vehicles

Cited by 21 publications

References 5 publications

Evasion guidance for air-breathing hypersonic vehicles against unknown pursuer dynamics

Evasion guidance for air-breathing hypersonic vehicles against unknown pursuer dynamics

Low-Complexity Adaptive Tracking Control for Unknown Pure Feedback Nonlinear Systems With Multiple Constraints

Flight Mechanics of Ram-Scram Transition

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