A Stability Analysis for Tethered Aerodynamically Shaped Balloons

DeLaurier, James

doi:10.2514/3.59054

Cited by 45 publications

(17 citation statements)

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“…In the simulation model, the width is D=0. 5 [m], the height H=0. 9 [m], the thickness t=5.0 [mm] and the mass m=140 [g].…”

Section: Test Modelsmentioning

confidence: 99%

“…In fact, the aerodynamics of kites are not simple and in some aspects more complex than those of aircraft. This is because kite aerodynamics involve several factors, which are difficult to treat, such as restrictions due to strings, 5) a flexible surface and unsteady flow field. So far, the analysis on kite flight characteristics has placed an emphasis on behaviors in a longitudinal, symmetrical plane, where the kite strings are also considered.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Based on CFD for Aerodynamic Characteristics of Kite in Flight

Mano

Kitamura

Doi

et al. 2014

AEROSPACE TECHNOLOGY JAPAN

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The motion of a kite is simulated using an in-house numerical simulation code, where aerodynamics are coupled with flight dynamics. In the present study aerodynamic forces, attitude and stability are examined for a kite with camber and string lines. The results reveal that the kite shows stable flight; specifically, it keeps a constant altitude, moving from side to side periodically. The reason for this is the restoring forces produced by strings on the kite, which generate simple harmonic motion of the kite. The motion obtained by the present method shows good agreement with experimental results. Thus, the numerical method used here is found to be effective in the simulation of a kite. Furthermore, based on the data obtained from the present numerical simulation, a model is proposed to analyze the characteristic motion in the flight of a kite using its aerodynamic properties, and the period of the kite's periodical motion in the lateral direction is explained.

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“…In the simulation model, the width is D=0. 5 [m], the height H=0. 9 [m], the thickness t=5.0 [mm] and the mass m=140 [g].…”

Section: Test Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Based on CFD for Aerodynamic Characteristics of Kite in Flight

Mano

Kitamura

Doi

et al. 2014

AEROSPACE TECHNOLOGY JAPAN

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show abstract

“…Therefore, the material chosen for the part of the cable that has to withstand the loads applied is Kevlar, which provides high strength characteristics (E 83; 000 MPa and U 3620 MPa) as well as low density (1450 kg=m 3 ). On the other hand, the material chosen for the electrical part of the cable is aluminum, which provides a resistivity of 1:82e-8 m and a density of 2700 kg=m 3 . Moreover, the weight of the conductor part of the tether can also be reduced by setting the transmission voltage to high values.…”

Section: A Aerostat For Electrical Power Generationmentioning

confidence: 99%

“…Several studies have been conducted in the past, most of which deal with the development of mathematical models to define the dynamic behavior of tethered streamlined aerostats when subjected to operational atmospheric conditions [3,4]. More recent publications [5,6] present different dynamic simulations performed to assess the feasibility of very high altitude tethered balloon systems.…”

mentioning

confidence: 99%

Dynamic Response to Turbulence of Tethered Lighter-Than-Air Platforms

Redi

Aglietti

Tatnall

et al. 2011

Journal of Aircraft

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The study presented in this paper concerns the development of an algorithm, based on finite element analysis, for the dynamic simulation of a tethered lighter-than-air balloon when subjected to operational conditions. The main features of the algorithm are described, highlighting the advantages of this approach when performing dynamic analysis. The input parameters considered in the method are derived from experimental and simulated data, which are elaborated to obtain the static and dynamic atmospheric properties in terms of mean windspeed profile, discrete gusts, and continuous turbulence. In particular, the algorithm is employed to perform a thorough analysis of a specific high-altitude tethered platform operating in a realistic design scenario. The dynamic behavior of the system is evaluated in terms of displacements and tether forces. The results, even though they are obtained for a specific example application, demonstrate the general viability of the algorithm proposed for the evaluation of the dynamic response of high-altitude tethered platforms and for the preliminary assessment of the technical feasibility of these systems.

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“…Lately, DeLaurier [6,7] included these forces in the analysis of the entire system and presented the correct interpretation of a towed flying object as a differential problem concerning the dynamics of an unextensible cable, one of the boundary conditions of which is represented by the equations of motion of the towed body. In this last case, when the possible approximations in dealing with the exact approach of the study are relaxed, namely small curvature and tension changes along the tracts by which the cable is discretized, the resulting solution procedure involves rather cumbersome calculations.…”

mentioning

confidence: 99%

Dynamics of a towed sailplane

Guido¹

1991

18th Atmospheric Flight Mechanics Conference

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Greek symbols • Research Assistant, Department of Mechanics and Aeronautics, Member AlAA The longitudinal stability of the system represented by towing airplane, cable and sailplane is investigated. The differential problem concerning the cable dynamics, the boundary conditions of which are the equations of motion of the two planes, is formulated. The resulting set of equations is linearized and the stability analysis is carried out. Strong interactions are shown to take place between cable, tow-plane and sailplane motions, leading to unstable situations in the considered range of practical flight conditions. € a f3 "1 S D.z w (j A tow-plane a attachment point B sailplane e equilibrium G center of mass r relative 0 unstretched angle of attack flight path angle rope mass per unit length elevator angle vertical distance of the planes stretching pitch angle eigenvalue mass density = 2m/pSc coordinates in body axes density real part of the eigenvalue coefficient of the imaginary part of the eigenvalue Superscripts

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A Stability Analysis for Tethered Aerodynamically Shaped Balloons

Cited by 45 publications

References 1 publication

Numerical Simulation Based on CFD for Aerodynamic Characteristics of Kite in Flight

Numerical Simulation Based on CFD for Aerodynamic Characteristics of Kite in Flight

Dynamic Response to Turbulence of Tethered Lighter-Than-Air Platforms

Dynamics of a towed sailplane

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