Control of a Wing Section With Structural Nonlinearities Using Leading and Trailing Edge Control Surfaces

2002 ◽  
Author(s):  
George Platanitis ◽  
Thomas Strganac
Keyword(s):  
Trailing Edge ◽  
Wing Section ◽  
Structural Nonlinearities ◽  
Control Surfaces

scholarly journals Design And Experimental Studies Of Flexible Trailing Edge For Variable Camber Morphing Wing

2021 ◽  
Author(s):  
Ahmad T. Kalaji
Keyword(s):  
Experimental Data ◽  
Carbon Fiber ◽  
Deflection Angle ◽  
Experimental Studies ◽  
Morphing Wing ◽  
Trailing Edge ◽  
Wing Section ◽  
Rigid Constraint ◽  
The Difference

This thesis presents a flexible trailing edge mechanism capable of undergoing a change in camber for a wing section. The mechanism takes advantage of a rigid constraint between the ends of two flexible carbon fiber panels, which produces a deflection when there is a difference in length between the two panels. A prototype was designed and built and experimental data was collected for the deformation of the panels for different values of lengths and analyzed to find a function to describe the coefficients which form the polynomials describing the shape for each of the panels, based on the difference in length value. Deflection and deflection angle results were used to develop a controller which will calculate the required change in length based on a deflection or angle and a bottom panel length input.

Aeroelastic Wing with Leading- and Trailing-Edge Control Surfaces

2003 ◽  
Vol 40 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Earl H. Dowell ◽  
Donald B. Bliss ◽  
Robert L. Clark
Keyword(s):  
Trailing Edge ◽  
Control Surfaces

Nonlinear control theory for a class of structural nonlinearities in a prototypical wing section

1997 ◽  
Author(s):  
Jeonghwan Ko ◽  
Andrew Kurdila ◽  
Thomas Strganac ◽  
Jeonghwan Ko ◽  
Andrew Kurdila ◽  
...  
Keyword(s):  
Control Theory ◽  
Nonlinear Control ◽  
Wing Section ◽  
Nonlinear Control Theory ◽  
Structural Nonlinearities

Low Reynolds number aerodynamics of leading-edge and trailing-edge hinged control surfaces: Part I statics

2020 ◽  
Vol 99 ◽  
pp. 105563 ◽  
Author(s):  
Ashim Panta ◽  
Alex Fisher ◽  
Abdulghani Mohamed ◽  
Matthew Marino ◽  
Ru Xu ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Leading Edge ◽  
Trailing Edge ◽  
Low Reynolds ◽  
Control Surfaces

The aerodynamic performance of paragliders

1999 ◽  
Vol 103 (1027) ◽  
pp. 421-428 ◽  
Author(s):  
H. Babinsky
Keyword(s):  
Separation Bubble ◽  
Lift Coefficient ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Two Dimensional ◽  
Trailing Edge ◽  
Wing Section ◽  
Two Factors ◽  
Performance Deterioration ◽  
Edge Separation

Abstract An analysis of paraglider performance has revealed that wing section drag is the most significant contribution to overall drag. Wind tunnel measurements performed on two-dimensional hollow models indicate that intake drag is less significant than previously thought. An experimental investigation into the characteristics of a ‘quasi ’ -two-dimensional flexible model consisting of solid ribs covered with a fabric skin was performed at realistic Reynolds numbers. The main cause of performance deterioration was found to be a significant reduction in section lift coefficient when compared to a similar solid wing section. This is believed to be mainly due to two factors: a large trailing edge separation and the deformation of the wing between ribs. The deformation was measured and it was shown that the deformed shape is less capable of generating high lift coefficients than the design section. It is thought that the extent of the trailing edge separation is increased due to the presence of streamwise grooves caused by the shape deformation of the wing. The shape of the separated region was found to be strongly three-dimensional with the separation point being about half a chord-length further upstream along the ribs. A small separation bubble was also observed immediately behind the lip of the intake, due to the fabric ‘flaring’ open. Based on the observations presented a number of suggestions for improved wings have been made.

Evaluation of a Simplified Grid Treatment for Oscillating Trailing-Edge Control Surfaces

2007 ◽  
Vol 44 (4) ◽  
pp. 1177-1188 ◽  
Author(s):  
A. M. Rampurawala ◽  
K. J. Badcock
Keyword(s):  
Trailing Edge ◽  
Control Surfaces
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