Studying the PTERO-G0 unmanned flying vehicles acoustic characteristics in AK-2 unechoic chamber

Aeronautical and Space-Rocket Engineering

Thermal engines, electric propulsion and power plants for flying vehicles


Аuthors

Belyaev I. V.1*, Valiev A. V.2**, Moshkov P. A.3***, Ostrikov N. N.1*

1. Central Aerohydrodynamic Institute named after N.E. Zhukovsky (TsAGI), 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia
2. АФМ-Servers, 20, Zorge str., Moscow, 125252, Russia
3. Yakovlev Corporation Regional Aircraft Branch, 26, Leninskaya Sloboda str., Moscow, 115280, Russia

*e-mail: aeroacoustics@mktsagi.ru
**e-mail: uav@ptero.ru
***e-mail: moshkov89@bk.ru, p_moshkov@ssj.irkut.com

Abstract

Recently, more and more attention is paid to the problem of ensuring unmanned flying vehicles (UAV's) invisibility in various frequency ranges due to the wide application of the systems with small sized UAVs for solving special assignment tasks. To ensure the UAV's invisibility in the audible frequency range at the specified distance from the observer in conditions of known terrain of application, the qualitative data on the UAV acoustic characteristics is required.

The experimental study of the small sized UAV's “Ptero-G0” acoustic characteristics was performed within the framework of the presented work. The UAV's power plant consisted of a single-cylinder gasoline internal combustion engine (ICE) and a small sized two-blade propeller with the fixed pitch. The acoustic tests were performed in TsAGI unechoic chamber AK-2.

The following main results were obtained as a result of experimental researches.

  1. Energy, spectral and spatial characteristics of acoustic fields of a small sized propeller and single-cylinder four-cycle gasoline engine were obtained.

  2. The small sized propellers diameter effect on UAV's noise and signature characteristics was studied. Recommendations on acoustic signature reduction of the UAV “Ptero-G0” were elaborated. These recommendations were implemented and accounted for by the “AFM-Servers” company while developing new flying vehicles.

  3. It was demonstrated that a cowl mounting on the engine without both vibration and acoustic insulation could lead to significant noise increase of the power plant.

  4. The possibility of employing the empirical model while solving the problem of a single-cylinder four-stroke gasoline engine's noise evaluation was demonstrated.

Within the framework of the subject's of UAV acoustics development, the authors are planning to proceed this work in the following main trends.

  1. Studying the effect of the power plant's noise shielding by the airframe elements on UAVs noise and signature characteristics.

  2. Studying the noise caused by the UAV airframe flow-around.

  3. Development of semi-empirical model of the small-sized propeller's noise.

  4. Implementation of the existing computation methods for audibility and signature boundaries into practice of noise indices evaluation of various UAV's types.

  5. Software development for UAV flight trajectories' plotting under known weather and landscape conditions without the ability to detect it both by ear and with acoustic location finder.

Keywords:

unmanned aerial vehicle, drone, propeller-engine power plant, a propeller, aircraft piston engine, drone noise, power plant noise, acoustic tests

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