Thermal soaring flight of birds and unmanned aerial vehicles

Thermal soaring saves much energy, but flying large distances in this form represents a great challenge for birds, people and unmanned aerial vehicles (UAVs). The solution is to make use of the so-called thermals, which are localized, warmer regions in the atmosphere moving upward with a speed exceeding the descent rate of birds and planes. Saving energy by exploiting the environment more efficiently is an important possibility for autonomous UAVs as well. Successful control strategies have been developed recently for UAVs in simulations and in real applications. This paper first presents an overview of our knowledge of the soaring flight and strategy of birds, followed by a discussion of control strategies that have been developed for soaring UAVs both in simulations and applications on real platforms. To improve the accuracy of the simulation of thermal exploitation strategies we propose a method to take into account the effect of turbulence. Finally, we propose a new GPS-independent control strategy for exploiting thermal updrafts.

[1]  Otto Lilienthal.  Der Vogelflug als Grundlage der Fliegekunst , 1943 .

[2]  David Lentink,et al.  How swifts control their glide performance with morphing wings , 2007 .

[3]  John H. Cochrane,et al.  MacCREADY THEORY WITH UNCERTAIN LIFT AND LIMITED ALTITUDE , 1999 .

[4]  Dario Floreano,et al.  Evolved swarming without positioning information: an application in aerial communication relay , 2009, Auton. Robots.

[5]  Thomas Alerstam,et al.  Flight Speeds among Bird Species: Allometric and Phylogenetic Effects , 2007, PLoS biology.

[6]  Willem Bouten,et al.  Flight altitudes of birds , 2005 .

[7]  Michael J. Allen,et al.  Autonomous Soaring for Improved Endurance of a Small Uninhabited Air Vehicle , 2005 .

[8]  J. Shamoun‐Baranes,et al.  DIFFERENTIAL USE OF THERMAL CONVECTION BY SOARING BIRDS OVER CENTRAL ISRAEL , 2003 .

[9]  Michael J. Allen.  Updraft Model for Development of Autonomous Soaring Uninhabited Air Vehicles , 2006 .

[10]  Roland Siegwart,et al.  Flying Solo and Solar to Mars Global Design of a Solar Autonomous Airplane for Sustainable Flight , 2006 .

[11]  H. Weimerskirch,et al.  Flight performance: Frigatebirds ride high on thermals , 2003, Nature.

[12]  Jean-Arcady Meyer,et al.  Soaring behaviors in UAVs : 'animat' design methodology and current results , 2007 .

[13]  C. Pennycuick.  Thermal Soaring Compared in Three Dissimilar Tropical Bird Species, Fregata Magnificens, Pelecanus Occidentals and Coragyps Atratus , 1983 .

[14]  V. Tucker,et al.  Gliding Birds: The Effect of Variable Wing Span , 1987 .

[15]  William S. Seegar,et al.  Autumn migration and wintering areas of Peregrine Falcons Falco peregrinus nesting on the Kola Peninsula, northern Russia , 2004 .

[16]  Scott A. Shaffer,et al.  Wind, Waves, and Wing Loading: Morphological Specialization May Limit Range Expansion of Endangered Albatrosses , 2008, PloS one.

[17]  George S. Young,et al.  AMERICAN WHITE PELICAN SOARING FLIGHT TIMES AND ALTITUDES RELATIVE TO CHANGES IN THERMAL DEPTH AND INTENSITY , 2002 .

[18]  Adrian L. R. Thomas.  The Flight of Birds that have Wings and a Tail: Variable Geometry Expands the Envelope of Flight Performance , 1996 .

[19]  Daniel J. Edwards,et al.  Autonomous Soaring: The Montague Cross-Country Challenge , 2010 .

[20]  André Noth,et al.  Design of Solar Powered Airplanes for Continuous Flight , 2008 .

[21]  Sankar Chatterjee,et al.  The aerodynamics of Argentavis, the world's largest flying bird from the Miocene of Argentina , 2007, Proceedings of the National Academy of Sciences.

[22]  Daniel J. Edwards.  Implementation Details and Flight Test Results of an Autonomous Soaring Controller , 2008 .

[23]  Tamás Vicsek,et al.  Comparing bird and human soaring strategies , 2008, Proceedings of the National Academy of Sciences.

[24]  V. Tucker,et al.  Aerodynamics of Gliding Flight in a Falcon and Other Birds , 1970 .

[25]  Jean-Arcady Meyer,et al.  Design of a bio-inspired controller for dynamic soaring in a simulated unmanned aerial vehicle. , 2006, Bioinspiration & biomimetics.

[26]  Grady J. Koch.  Using a Doppler light detection and ranging (lidar) system to characterize an atmospheric thermal providing lift for soaring raptors , 2006 .

[27]  Colin J Pennycuick,et al.  Gliding Flight of the White-Backed Vulture Gyps Africanus , 1971 .

[28]  V. Tucker,et al.  GLIDING BIRDS: REDUCTION OF INDUCED DRAG BY WING TIP SLOTS BETWEEN THE PRIMARY FEATHERS , 1993 .

[29]  Reto Spaar,et al.  Migration by Flapping or Soaring: Flight Strategies of Marsh, Montagu's and Pallid Harriers in Southern Israel , 1997 .