Journal ArticleDOI
A Benchmark Control Problem for Supercavitating Vehicles and an Initial Investigation of Solutions
John Dzielski,Andrew J. Kurdila +1 more
TLDR
In this article, the authors present a derivation of a benchmark problem for control of high-speed supercavitating vehicles (HSSVs) which focuses exclusively on the pitch-plane dynamics of the body.Abstract:
At very high speeds, underwater bodies develop cavitation bubbles at the trailing edges of sharp corners or from contours where adverse pressure gradients are sufficient to induce flow separation. Coupled with a properly designed cavitator at the nose of a vehicle, this natural cavitation can be augmented with gas to induce a cavity to cover nearly the entire body of the vehicle. The formation of the cavity results in a significant reduction in drag on the vehicle and these so-called high-speed supercavitating vehicles (HSSVs) naturally operate at speeds in excess of 75 m s-1. The first part of this paper presents a derivation of a benchmark problem for control of HSSVs. The benchmark problem focuses exclusively on the pitch-plane dynamics of the body which currently appear to present the most severe challenges. A vehicle model is parametrized in terms of generic parameters of body radius, body length, and body density relative to the surrounding fluid. The forebody shape is assumed to be a right cylindri...read more
Citations
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Journal ArticleDOI
Friction Drag Reduction of External Flows with Bubble and Gas Injection
TL;DR: In this article, the use of partial and supercavities for drag reduction of axisymmetric objects moving within a liquid is reviewed, and the current applications of these techniques to underwater vehicles and surface ships are discussed.
Journal ArticleDOI
Longitudinal Motion Control of a High-Speed Supercavitation Vehicle
TL;DR: In this paper, a simplified model of longitudinal dynamics is developed for control, and a dynamic inversion based inner-loop con- trol technique is proposed to handle the switched, time-delay dependent behavior of the vehicle.
Journal ArticleDOI
Dynamics and Control of Supercavitating Vehicles
TL;DR: In this article, two controllers are proposed to realize stable inner-loop dynamics, a linear state feedback control scheme and a switching control scheme, which can stabilize a supercavitating vehicle with a large region of attraction around the trim condition instead of just stabilization around the limit cycle motion.
Journal ArticleDOI
Nonlinear Control Design for a Supercavitating Vehicle
Xiaofeng Mao,Qian Wang +1 more
TL;DR: Several nonlinear control design approaches such as sliding-mode control and quasi linear-parameter-varying control for the dive-plane dynamics of a supercavitating vehicle model are investigated.
Journal ArticleDOI
Nonlinear Dynamics and Bifurcations of a Supercavitating Vehicle
TL;DR: In this article, a numerical study of the bifurcation behavior of a supercavitating vehicle is conducted, where the vehicle model is nonsmooth; this is a result of the planing force acting on the vehicle.
References
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Journal ArticleDOI
Flight control design using non-linear inverse dynamics
S. H. Lane,Robert F. Stengel +1 more
TL;DR: Inverse dynamics are generated for specific command variable sets of a 12-state nonlinear aircraft model to develop a control system that provides satisfactory response over the entire flight envelope.
Journal ArticleDOI
Exact nonlinear control of large angle rotational maneuvers
TL;DR: In this article, the rigid body attitude control problem with external torques is transformed into an equivalent linear form implementable by three double integrators, and the linearizing transformations themselves are formulated in vector algebra, requiring no integrators for implementation.
Journal ArticleDOI
Aircraft automatic flight control system with model inversion
G. Allan Smith,George Meyer +1 more
TL;DR: In this article, a simulation study was conducted to verify the advantages of a Newton-Raphson model-inversion technique as a design basis for an automatic trajectory control system in an aircraft with highly nonlinear characteristics.