Modeling of Apparent Mass Effects for the Real-Time Simulation of a Hybrid Airship

Atkinson, Christopher; Urso, Robert G.

doi:10.2514/6.2006-6619

Cited by 17 publications

(13 citation statements)

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“…5 and 7 show the same trend, and all the rotational coefficients approach zero, and could be considered negligible, even for a small number of elements. The precision of the method has been also assessed in the computation of the igure 6: AM rotational coefficients (ellipsoid) 5 show that an increasing number of elements leads to a reduction of M coefficients. Figures 4 and 6 show the same trend, and all the ero, and could be considered negligible, even for a small number of ethod has been also assessed in the computation of the λ 11 coefficient x 1m, with a thickness of 0.1 m. The value computed by the formula , as the following Figure 7 shows, together with the results found for coefficient (along the x axis) for a plate 1m x 1m, with a thickness of 0.1 m. The value computed by the formula included in Ref.…”

Section: Mesh Featuresmentioning

confidence: 99%

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Added masses computation for unconventional airships and aerostats through geometric shape evaluation and meshing

Tuveri¹,

Ceruti²,

Marzocca³

2014

International Journal of Aeronautical and Space Sciences

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The modern development in design of airships and aerostats has led to unconventional configurations quite different from the classical ellipsoidal and spherical ones. This new class of air-vehicles presents a mass-to-volume ratio that can be considered very similar to the density of the fluid displaced by the vehicle itself, and as a consequence, modeling and simulation should consider the added masses in the equations of motion. The concept of added masses deals with the inertia added to a system, since an accelerating or decelerating body moving into a fluid displaces a volume of the neighboring fluid. The aim of this paper is to provide designers with the added masses matrix for more than twenty Lighter Than Air vehicles with unconventional shapes. Starting from a CAD model of a given shape, by applying a panel-like method, its external surface is properly meshed, using triangular elements. The methodology has been validated by comparing results obtained with data available in literature for a known benchmark shape, and the inaccuracies of predictions agree with the typical precision required in conceptual design. For each configuration, a CAD model and a related added masses matrix are provided, with the purpose of assisting the practitioner in the design and flight simulation of modern airships and scientific balloons.

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Section: Mesh Featuresmentioning

confidence: 99%

“…The problem of added masses for a new configuration was introduced by Ref. [5], albeit for a specific shape of hybrid airship; while Ref. [2] : added masses coefficients …”

Section: Introductionmentioning

confidence: 99%

Added masses computation for unconventional airships and aerostats through geometric shape evaluation and meshing

Tuveri¹,

Ceruti²,

Marzocca³

2014

International Journal of Aeronautical and Space Sciences

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“…Toshitaka pointed out that stratosphere is very good for airship hovering, because stratosphere is stable [1][2][3]. So airship become more popular as a relay station communication or monitoring platform.…”

Section: Introductionmentioning

confidence: 99%

Modeling and PID Control of Height Loop of a Kind of Airship Vehicle

Wang¹,

Lei²,

Wang³

2015

Proceedings of the 3rd International Conference on Mechanical Engineering and Intelligent Systems (ICMEIS 2015)

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“…In recent years, due to its potential application value in military, the airship has attracted the attention of researchers from many countries [1][2][3][4][5] . The height control loop of the airship is based on the complete design of the inner loop , which is also called attitude angle tracking loop.…”

Section: Introductionmentioning

confidence: 99%

Integral Sliding mode Control of Height Loop of a Kind of Airship Vehicle

Jin¹,

Wu²,

Lei³

2016

Proceedings of the 2016 4th International Conference on Machinery, Materials and Computing Technology

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Abstract.A kind of integral sliding mode surface method is firstly used in the height loop of airship system based on the assumption that the pitch angle control loop is stable. The expected pitch angle signal is caused by the sliding mode surface which is produced by height error .Compared with traditional PID height loop control strategy, this integral sliding mode method has a very quick output response and simulation result shows that the proposed method is also very accurate in the task of tracking of desired height.

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Modeling of Apparent Mass Effects for the Real-Time Simulation of a Hybrid Airship

Cited by 17 publications

References 1 publication

Added masses computation for unconventional airships and aerostats through geometric shape evaluation and meshing

Added masses computation for unconventional airships and aerostats through geometric shape evaluation and meshing

Modeling and PID Control of Height Loop of a Kind of Airship Vehicle

Integral Sliding mode Control of Height Loop of a Kind of Airship Vehicle

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