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An analysis of phugoid oscillations of unmanned flying wing

Mioduska P.

Journal of KONES

2016

Vol. 23, No. 2

247--254

The flying wing configuration has been considered by airplane designers for more than one hundred years. Tailless aircraft have been inspired by nature and its solutions. In present times, this configuration is used to design Unmanned Aerial Vehicle (UAV). This type of plane could serve personal, military and research purposes. The flying wing is characterized by large amount of payload space, smaller wetted area than conventional airplane and stealth capability. This makes, that it is widely applicable in rescue operations, geodetic and cartographic research, monitoring of natural resources, taking pictures or videos. Despite all the merits of tailless plane, it also has its downsides. The main problem of this type of aircraft is longitudinal stability. A conventional airplane can compensate the pitch moment of the wing with its horizontal tail but a flying wing is tailless. A slow decay of oscillations amplitude is the problem, which can be solved by active control or proper aerodynamic design. A combination of geometric characteristic such as sweep, taper, twist and location of vertical stabilizers along span, can lead to stable flying wing. In this article, the results of phugoid oscillations analysis of unmanned flying wing are presented. Research platform was X8-2, popular flying wing UAV, designed for First Person View (FPV) method to control the vehicle. The calculations were performed using 3D panel method. On the basis of calculations for three versions of the model aircraft, the dynamic characteristics were created. The analysis of longitudinal stability undertaken here has indicated propriety of applied changes in geometry.

Badanie stateczności mostów nożycowych

Kamyk Z., Malej W., Śliwiński C., Duszak M., Śliwiński J.

Szybkobieżne Pojazdy Gąsienicowe

2015

nr 1 (36)

129--136; 137--144

W artykule przedstawiono podział funkcjonalny mostów wojskowych ze względu na ich wykorzystanie w różnych fazach działań bojowych. Przeanalizowano fazy procesu ustawiania przęsła na przeszkodzie pod kątem zachowania stateczności wzdłużnej i poprzecznej. Opisano sposób wyznaczenia zapasu stateczności wzdłużnej oraz wartości dodatkowego momentu wywracającego przęsła mostu MG-20 wynikającego z bezwładności układów podczas awaryjnego zatrzymania przęsła w trakcie jego rozkładania. Opisano również sposób sprawdzenia stateczności poprzecznej i wzdłużnej mostu MS-20 przy oddziaływaniu wiatru na przęsło w położeniu pionowym. Analizy wykazały właściwą stateczność przęseł MS-20 i MG-20.

In the paper authors presented functional structures of military bridges with respect to different phases of military actions. Individual phases of emplacing the bridge span over a gap/obstacle have been described, with particular attention being paid to ensuring the longitudinal and transverse stability. The method of calculating the longitudinal stability reserve and the additional overturning moment for MG-20 bridge span required has been described. This moment results from the system’s inertia during the bridge span emergency stop which occurs while launching. Furthermore, the method of verifying the longitudinal and transverse stability of the MS-20 bridge span in windy conditions, when it is positioned vertically, has been given. The analyses have demonstrated proper stability of both the MS-20 and MG-20 bridge spans.