Research on parafoil stability using a rapid estimate model

Abstract With the consideration of rotation between canopy and payload of parafoil system, a four-degree-of-freedom (4-DOF) longitudinal static model was used to solve parafoil state variables in straight steady flight. The aerodynamic solution of parafoil system was a combination of vortex lattice method (VLM) and engineering estimation method. Based on small disturbance assumption, a 6-DOF linear model that considers canopy additional mass was established with benchmark state calculated by 4-DOF static model. Modal analysis of a dynamic model was used to calculate the stability parameters. This method, which is based on a small disturbance linear model and modal analysis, is high-efficiency to the study of parafoil stability. It is well suited for rapid stability analysis in the preliminary stage of parafoil design. Using this method, this paper shows that longitudinal and lateral stability will both decrease when a steady climbing angle increases. This explains the wavy track of the parafoil observed during climbing.

[1]  Glen Brown,et al.  Apparent mass effects on parafoil dynamics , 1993 .

[2]  J Lingard.  The Aerodynamics of Gliding Parachutes , 1986 .

[3]  Mark Costello,et al.  Combined Lateral and Longitudinal Control of Parafoils Using Upper-Surface Canopy Spoilers , 2015 .

[4]  Benjamin S. Chiel,et al.  Autonomous parafoil guidance in high winds , 2015 .

[5]  Yu Gang.  Nine-degree of Freedom Modeling and Flight Dynamic Analysis of Parafoil Aerial Delivery System☆ , 2015 .

[6]  Peter Crimi,et al.  Lateral stability of gliding parachutes , 1990 .

[7]  T. Goodrick.  Theoretical study of the longitudinal stability of high-performance gliding airdrop systems , 1975 .

[8]  Jonathan P. How,et al.  Wind Uncertainty Modeling and Robust Trajectory Planning for Autonomous Parafoils , 2016 .

[9]  Gil Iosilevskii,et al.  Center of Gravity and Minimal Lift Coefficient Limits of a Gliding Parachute , 1995 .

[10]  John D. Nicolaides,et al.  Parafoil Flight Performance , 1970 .

[11]  John D. Nicolaides.  Parafoil Wind Tunnel Tests , 1971 .

[12]  Hua Yang,et al.  Dihedral influence on lateral–directional dynamic stability on large aspect ratio tailless flying wing aircraft , 2014 .

[13]  Yang Hua,et al.  Study on Powered-Parafoil Longitudinal Flight Performance with a Fast Estimation Model , 2013 .

[14]  T. Goodrick.  Simulation studies of the flight dynamics of gliding parachute systems , 1979 .

[15]  T. Goodrick.  Scale effects on performance of ram air wings , 1984 .

[16]  Christiaan Redelinghuys,et al.  A Graphic Portrayal of Parafoil Trim and Static Stability , 2007 .

[17]  Lei Song,et al.  A study of instability in a miniature flying-wing aircraft in high-speed taxi , 2015 .

[18]  Peter Johnson,et al.  Gliding parachute performance testing , 2001 .

[19]  Qinglin Sun,et al.  Modeling of powered parafoil based on Kirchhoff motion equation , 2015 .

[20]  Michael Ward,et al.  Parametric Study of Powered Parafoil Flight Dynamics , 2012 .