Numerical simulation of the unmanned aerial vehicle capture dynamics by elastic arrestor gear device

Aeronautical and Space-Rocket Engineering


Аuthors

Vasilev F. A.1*, Podkolzin V. G.2**, Shcheglov G. A.1***

1. Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia
2. Scientific and Methodological Center “Norm”, 24, Petrovka str., build. 1, Moscow, 127051, Rossia

*e-mail: vasilevfa@list.ru
**e-mail: nmcnorma@inbox.ru
***e-mail: shcheglov_ga@bmstu.ru

Abstract

The article regards the problem of an airplane-type unmanned aerial vehicle (UAV) short landing ensuring by the horizontal elastic rope-type recovery system, and presents substantiation of the of the studied subject relevance and examples of the existing landing devices. The purpose of this article consists in estimating dynamics of the landing device functioning. The authors suggest employing a new approach to the dynamic loads reduction, consisting in airflow directing toward the UAV being captured. The article considers a four-bar landing mechanism consisting of a horizontal boom, a vertical mast, a lever and an elastic rope located parallel to the boom.

The UAV is equipped with a beam with a hook, by which it catches onto the rope. Numerical simulation results of the landing system functioning dynamics are presented. Parameters of the transition mode occurring while the UAVs capturing were determined with the MSC ADAMS software package. Computing of the internal stresses in this elastic element was performed to estimate the threshold, at which the rupture in the elastic element was possible. The joints reaction forces in the mechanism are determined. The authors found the range of the rope stiffness and the beam length, for which no dangerous overturn of the UAV in the vertical plane occurs after the capture. Analysis of the system dynamics in the case of the beam fixing by the elastic cylindrical hinge was performed. The inference was made on the expediency of the hook rigid attachment to the UAV. Numerical modeling revealed the fact that the presence of the oncoming flow may significantly, more that thrice, reduce the peak loads in the system elements, occurring while the UAV capturing. The UAV flow-around by the oncoming flow, directed at the angle of attack, contributes to the loads reduction during capturing by 3–20% depending on the oncoming flow speed. The effect from the oncoming flow creating device application consists in the fact that due to the significant reduction of loads in the system, a possibility for either landing device lightening or performing the heavier UAV landing arises.

Keywords:

unmanned aerial vehicle, landing device, numerical simulation, rope-type recovery device, MSC ADAMS

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