Topology-Optimized Design and Testing of a Pressure-Driven Morphing-Aerofoil Trailing-Edge Structure

Vasista, Srinivas; Tong, Liyong

doi:10.2514/1.j052239

Cited by 33 publications

(26 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Advantages of these complex airfoil control methods include reduced RADAR signature, improved aerodynamic efficiency, and passive control. Recent relevant publications include [8][9][10]. Here we consider one control approach obtained by deflecting the aft portion of an airfoil in a parabolic manner.…”

Section: Introductionmentioning

confidence: 99%

Geometric Definition and Ideal Aerodynamic Performance of Parabolic Trailing-Edge Flaps

F¹,

T²,

J³

2019

Int J Astronaut Aeronautical Eng

View full text Add to dashboard Cite

A parabolic trailing-edge flap is defined as a parabolic deflection of the airfoil geometry aft of a hinge point. Whereas a traditional flap deflection causes a discontinuous camber-line slope at the hinge point, a parabolic deflection produces a camber line that is first-order continuous at the hinge point. The geometry manipulation of a parabolic flap is mathematically defined such that it can be applied to any airfoil with a known camber line and thickness distribution. Small-angle and small-camber approximations are used to find analytical predictions for the ideal section flap effectiveness as well as the section pitching moment in comparison to a traditional flap. Results of the parabolic flap are compared to those of a traditional flap producing equivalent lift using thin airfoil theory and the vortex-panel method. It is shown that the ideal section flap effectiveness for a parabolic flap can be 33-50% higher than that of a traditional flap, depending on the flap-chord fraction. Additionally, a parabolic flap will produce a change in pitching moment 5-50% greater than that of a traditional flap for a given change in lift. Results may be applied in the design of modern morphing wings, for which complex flap deflections can be produced.

show abstract

Section: Introductionmentioning

confidence: 99%

Geometric Definition and Ideal Aerodynamic Performance of Parabolic Trailing-Edge Flaps

F¹,

T²,

J³

2019

Int J Astronaut Aeronautical Eng

View full text Add to dashboard Cite

show abstract

“…Based on this functional principle, Barrett and Vos developed [10,12] and patented [13] the concept of a pressure adaptive honeycomb using equilateral hexagonal cells. Furthermore, Vasista et al presented the concept of a topology-optimized pressure-driven trailing edge with a focus on the potentials of topology optimization for the design of complex flexure hinges [14]. The concept of adaptive pressure-controlled cellular structures for large one-dimensional actuation strain was examined by Luo et al [15,16].…”

Section: Introductionmentioning

confidence: 99%

Development and Testing of Woven FRP Flexure Hinges for Pressure-Actuated Cellular Structures with Regard to Morphing Wing Applications

et al. 2019

View full text Add to dashboard Cite

Shape-variable structures can change their geometry in a targeted way and thus adapt their outer shape to different operating conditions. The potential applications in aviation are manifold and far-reaching. The substitution of conventional flaps in high-lift systems or even the deformation of entire wing profiles is conceivable. All morphing approaches have to deal with the same challenge: A conflict between minimizing actuating forces on the one hand, and maximizing structural deflections and resistance to external forces on the other. A promising concept of shape variability to face this challenging conflict is found in biology. Pressure-actuated cellular structures (PACS) are based on the movement of nastic plants. Firstly, a brief review of the holistic design approach of PACS is presented. The aim of the following study is to investigate manufacturing possibilities for woven flexure hinges in closed cellular structures. Weaving trials are first performed on the material level and finally on a five-cell PACS cantilever. The overall feasibility of woven fiber reinforced plastics (FRP)-PACS is proven. However, the results show that the materials selection in the weaving process substantially influences the mechanical behavior of flexure hinges. Thus, the optimization of manufacturing parameters is a key factor for the realization of woven FRP-PACS.

show abstract

“…This trailing edge flap autonomously changes its shape in different flight altitudes and takes advantage of aerostatic pressure differences (Vos R. et al, Pressure Adaptive Honeycomb: Mechanics, Modeling, and Experimental Investigation, 2010). Recently two very similar concepts followed this idea, a topology-optimized design for morphing airfoils (Vasista S. et al, 2013) and an adaptive pressure-controlled compliant structure for linear motion (Luo Q. et al, 2013). The work on pressurized cellular structures is an ongoing endeavor.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 summarizes the preceding work on shape changing structures using pressurized cellular structures. Mechanics, Modeling, and Experimental Investigation, 2010), (2) topology optimized design from Vasista (Vasista S. et al, 2013), (3) compliant structure for linear motion (Luo Q. et al, 2013) and (4) PACS (Pagitz M. et al, 2012)…”

Section: Introductionmentioning

confidence: 99%

PACS—Realization of an adaptive concept using pressure actuated cellular structures

Gramüller

Boblenz

Hühne

2014

Smart Mater. Struct.

View full text Add to dashboard Cite

A biologically inspired concept is investigated which can be utilized to develop energy efficient, lightweight and applicational flexible adaptive structures. Building a real life morphing unit is an ambitious task as the numerous works in the particular field show. Summarizing fundamental demands and barriers regarding shape changing structures, the basic challenges of designing morphing structures are listed. The concept of Pressure Actuated Cellular Structures (PACS) is arranged within the recent morphing activities and it is shown that it complies with the underlying demands. Systematically divided into energy-related and structural subcomponents the working principle is illuminated and relationships between basic design parameters are expressed. The analytical background describing the physical mechanisms of PACS is presented in concentrated manner. This work focuses on the procedure of dimensioning, realizing and experimental testing of a single cell and a single row cantilever made of PACS. The experimental outcomes as well as the results from the FEM computations are used for evaluating the analytical methods. The functionality of the basic principle is thus validated and open issues are determined pointing the way ahead.

show abstract

Topology-Optimized Design and Testing of a Pressure-Driven Morphing-Aerofoil Trailing-Edge Structure

Cited by 33 publications

References 33 publications

Geometric Definition and Ideal Aerodynamic Performance of Parabolic Trailing-Edge Flaps

Geometric Definition and Ideal Aerodynamic Performance of Parabolic Trailing-Edge Flaps

Development and Testing of Woven FRP Flexure Hinges for Pressure-Actuated Cellular Structures with Regard to Morphing Wing Applications

PACS—Realization of an adaptive concept using pressure actuated cellular structures

Contact Info

Product

Resources

About