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A Mesh Based Approach for Unconventional Unmanned Airship Added Masses Computation
Technical Paper
2013-01-2191
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Added masses computation is a crucial aspect to be considered when the density of a body moving in a fluid is comparable to the density of the fluid displaced: added mass can be defined as the inertia added to a system because an accelerating or decelerating body displaces some volume of neighboring fluid as it moves through it. The motion of vehicles like airships and ships can be addressed only by keeping into account the effect of added masses, while in case of aircrafts and helicopters this contribution is usually neglected. Lighter Than Air flight simulation, unmanned airships flight control system, airships flight dynamics are typical applications in which added masses are fundamental to achieve an effective and realistic modeling. A panel based method using the mesh of an airship external shape is developed to account for the added massed. While the mathematical background of the methodology is described in literature, what is missing is a proper description suitable for unconventional manned/unmanned airship. Two applications of the methods have been carried out to check the precision of the methods, and results have been also compared to a case study whose added masses are described in literature. A sensitivity study on the effect on the added masses of the number of elements in which the envelope is discretized is performed. Finally, for an unconventional unmanned airship model, the computations of the terms of the added masses matrix are shown.
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Citation
Tuveri, M., Ceruti, A., Persiani, F., and Marzocca, P., "A Mesh Based Approach for Unconventional Unmanned Airship Added Masses Computation," SAE Technical Paper 2013-01-2191, 2013, https://doi.org/10.4271/2013-01-2191.Also In
References
- Lamb , H. The inertia-coefficients of an ellipsoid moving in a fluid Reports and Memoranda, No. 623 October 1918
- Hess , J. and Smith , A. Calculation of Potential Flow About Arbitrary Bodies Progress in Aeronautical Sciences 8 1967
- Birkhoff , G. Hydrodynamics Princeton Univ. Press Princeton 1960
- Lamb , G. Hydrodynamics Cambridge University Press Cambridge 1932
- Anderson , W.J. , Shah , G.N. Park Jungsun, Added mass of high-amplitude balloons J. Aircraft 32 2 285 289 1995
- Lojcjanskij , L.G. Mechanics of Fluid and Gas Nauka Moscow 1970
- Riman , I.S. , Kreps , R.L. Added masses of bodies of various shape Proceedings of Central Institute of Aero- and Hydrodynamics 635 1 46 1947
- Korotkin A. I. Added mass of ship structure Fluid mechanics and its applications 88 2009
- Brennen C. E. A review of added mass and fluid inertial forces Naval Civil Engineering Laboratory Port Hueneme, California January 1982
- Kats , J. and Plotkin , A. Low-Speed Aerodynamics Cambridge University Press 2nd 2001
- Becker , A.A. The Boundary Element Method in Engineering Mc-Graw Hill 1992
- Kochin , N.E. , Kibel , I.A. , and Rose , N.V. Theoretical Hydromechanics, Parts I and II. State Publisher of Physical and Mathematical Literature Moscow 1963