TY - JOUR AU - Ziad Bin Abdul Awal, PY - 2017/12/25 Y2 - 2024/03/29 TI - UNMANNED ROTORCRAFT IN AGGRESSIVE ENVIRONMENT: AERODYNAMIC FLOW PERFORMANCE AGAINST WIND GUST JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 13 IS - 40 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/1389 SP - 173-182 AB - <p>Unmanned rotary-wing aircrafts or rotorcrafts are often prone to diverse atmospheric <br>turbulences, and undeniably, abrupt gusts are reckoned to be the most acquainted commotion of them. Time <br>and again, gust turbulence have dictated being the regulating trigger for countless mishaps concerning micro <br>aerial vehicles. Given that the core/main rotor provides principal lift along with governing directional control <br>and dynamic stability for any rotorcraft, the demeanors of thrust or induced air-flow through the gyrating blades<br>largely signify the barebones of its functionality. This paper presents an idiosyncratic approach towards<br>reviewing the impact of wind gust on rotor induced aerodynamic flow performance of an unmanned rotorcraft. <br>Artificial gusts have been generated through the inherent concept of forced pitched oscillation without the use <br>of any conventional wind tunnel. Gust air-speed and the rotor induced air-speed are gauged through the same<br>contraption to provide homogeneous quantitative valuation. Each rotor-halves have been assessed ‘root-to-tip’<br>across designated span-wise positions against selected strengths of gust. Comparative analysis with normal <br>atmospheric condition indicated gradual loss of cumulative thrust during hover (15-40%) and forward flight <br>(10-30%) within the stipulated gust range and infers the risk of declining altitude. Protuberant imbalance of <br>thrust across the rotor disk during hover indicated the likelihood of lackadaisical half-pitched rolling motion.<br>However, during forward flight, the reduced discrepancy of thrust between the rotor halves signified gradual <br>loss of cruising speed with regards to the increasing gust strength for the specific rotorcraft model.<br>Experimental findings in this study exhibited prospect of appraisal with full-scale rotorcrafts.</p> ER -