Heaving motions of a ram wing translating above water

Matveev, Konstantin I.; Chaney, Christopher S.

doi:10.1016/j.jfluidstructs.2012.10.006

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…He performed a theoretical analysis to show Ekranocat beneficial aspects. 4 Matveev and colleagues [5][6][7] experimentally examined the static characteristics of a WIG craft with catamaran hull form, which equipped a power augmented ram (PAR) platform and a flap in the close proximity to the ground and water. Yinggu et al 8 presented a hydro-aerodynamic modeling of a flying boat using approximation methods and experimental data.…”

Section: And Fink Andmentioning

confidence: 99%

Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off

Dakhrabadi

Seif

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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Hydro-aerodynamic mathematical model and multi-objective optimization of a popular wing-in-ground effect craft are presented in this research using a hydro-aerodynamic practical method and the genetic algorithm. The primary components of the wing-in-ground effect craft configuration include a compound wing, catamaran hull form and a poweraugmented ram platform. The hydro-aerodynamic practical method with low computational time and high accuracy is performed by coupling hydrodynamic and aerodynamic considerations using the potential flow theory in ground effect and the semi-empirical equations proposed for high-speed marine vehicles. The trade-off between hydrodynamic and aerodynamic characteristics makes it difficult to simultaneously satisfy the design requirements of high hydroaerodynamic performance. In this article, three goals-reduced hump resistance, increased compound wing lift-to-drag ratio and reduced takeoff speed-are selected as the objective functions. The longitudinal position of center of gravity, position of outer wing with respect to main wing, power augmented ram platform angle to horizontal and flap angle are also adopted as design variables. Static height stability and the location of the center of gravity with respect to the aerodynamics centers are considered as constraints for the stable flight in ground effect. The optimal solutions of the multiobjective optimization were not unique, rather a set of non-dominated optima, called the Pareto sets, are obtained. As a result of the multi-objective optimization, 25 Pareto individuals are obtained that the naval architects can use in designing wing-in-ground crafts.

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Section: And Fink Andmentioning

confidence: 99%

Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off

Dakhrabadi

Seif

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…Grundy (1986) accounted for some hydrodynamic effects. Recently, more complete models for this problem in the infinite-span formulation were developed (Matveev 2013), and some unsteady phenomena were considered (Matveev & Chaney 2013). This article represents an extension of the previous studies aimed at accounting for finite spans of ram wings.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Finite-span Ram Wings Moving Above Water at Finite Froude Numbers

Matveev¹

2014

Journal of Ship Research

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Power-augmented ram wings can be used for very fast transportation of heavy cargo over water and relatively flat solid surfaces. This article describes a coupled aerohydrodynamic model for a ram wing in steady forward motion. Effects of a finite wingspan and finite Froude numbers are accounted for by the extreme ground effect theory for airflow and a linearized potential flow theory for water. Representative results showing the influence of several variable parameters of the vehicle geometry and operational regimes are demonstrated for a selected ram-wing configuration. The developed method can be applied for modeling of airborne lifting surfaces operating in the strong ground effect on a variety of fast marine craft.

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“…Tuck (1984), Barber (2007), and Zong et al (2012) calculated water surface deformations caused by wings steadily flying in ground effect. Matveev and Chaney (2013), and Liang et al (2014) modeled airfoils heaving above water surfaces.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Roll-Heave-Pitch Motions of a Ram Wing Translating over Non-uniform Surface

Matveev

2019

J. Marine. Sci. Appl.

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Ground-effect vehicles flying close to water or ground often employ ram wings which generate aerodynamic lift primarily on their lower surfaces. The subject of this paper is the 3-DOF modeling of roll, heave, and pitch motions of such a wing in the presence of surface waves and other ground non-uniformities. The potential-flow extreme-ground-effect theory is applied for calculating unsteady pressure distribution under the wing which defines instantaneous lift force and moments. Dynamic simulations of a selected ram wing configuration are carried out in the presence of surface waves of various headings and wavelengths, as well as for transient flights over a ground obstacle. The largest amplitudes of the vehicle motions are observed in beam waves when the periods of the encounter are long. Nonlinear effects are more pronounced for pitch angles than for roll and heave. The present method can be adapted for modeling of air-supported lifting surfaces on fast marine vehicles. Article Highlights• Ram wings flying close to water or ground surfaces can produce high aerodynamic lift.• Unsteady forces on wings moving over surface waves are modeled with a potential-flow method.• Dynamics of a ground-effect vehicle is studied at different wave headings and amplitudes.

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Heaving motions of a ram wing translating above water

Cited by 9 publications

References 12 publications

Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off

Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off

Modeling of Finite-span Ram Wings Moving Above Water at Finite Froude Numbers

Modeling of Roll-Heave-Pitch Motions of a Ram Wing Translating over Non-uniform Surface

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