Development of a Quasi-Static Span-Extending Blade Tip for a Morphing Helicopter Rotor

Vocke, Robert D.; Kothera, Curt S.; Wereley, Norman M.

doi:10.2514/1.c032729

Cited by 4 publications

(4 citation statements)

References 34 publications

(39 reference statements)

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“…al. [25], have performed a study that presents the design and validation results for a quasi-static morphing helicopter rotor blade with an adaptive tip. The adaptive tip had the ability to increase its local span by 100% with the constant chord.…”

Section: Fig 15 Technical Drawings Of the Wingspan Changeable Wing mentioning

confidence: 99%

A Review on Applications and Effects of Morphing Wing Technology on UAVs

Özel

Ozbek

Ekici

2020

IJAST

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Unmanned aerial vehicles (UAVs) have excelled with their ability to perform the intended task on or without personnel. In recent years, UAVs have been designed for civilian purposes as well as military applications. Morphing wings are changeable wing applications developed as a result of the need for a different lift and drag forces in various phases of the flight of aircraft. It is an application that enables altering the wing aspect ratio, wing airfoil, wing airfoil camber ratio, wing reference area and even different angles of attack are obtained in different parts of the wing. Although morphing wing application has just begun on today’s UAVs, modern airliners already have morphing wingtip devices such as Boeing 777-X’s. The benefits of the use of morphing wings for UAVs make this technology important. UAVs with morphing wing technology; may increase its payload ratio, may achieve a shorter take-off distance, may land and stop in shorter distance, may take-off where runway clearance is limited, has more efficient altitude change at lower engine RPMs, can obtain higher cruise speeds, may decrease its stall speed, may lower its drag if necessary, thus; saving energy and time. This study concludes a review of literature over morphing wing technology.

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Section: Fig 15 Technical Drawings Of the Wingspan Changeable Wing mentioning

confidence: 99%

A Review on Applications and Effects of Morphing Wing Technology on UAVs

Özel

Ozbek

Ekici

2020

IJAST

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“…The structural solution adapted to achieve the variable span capability consists of a hollow outer wing, which supports loadings by having leading and trailing-edge composite carbon fibre reinforcement, as well as composite carbon fibre reinforcements, evenly spaced along the span to substitute conventional ribs. References [43] and [44] described the implementation of a continuous span morphing wing with two primary 17% in endurance. In [46], the compliant spar concept was developed and modelled to allow the wingspan to be varied, providing roll control and enhancing the operational performance for a medium altitude long endurance unmanned aerial vehicle (UAV).…”

Section: Morphing Trailing-edgementioning

confidence: 99%

A review of modelling and analysis of morphing wings

Zhao

Ronch

et al. 2018

Progress in Aerospace Sciences

245

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Morphing wings have a large potential to improve the overall aircraft performances, in a way like natural flyers do. By adapting or optimising dynamically the shape to various flight conditions, there are yet many unexplored opportunities beyond current proof-of-concept demonstrations. This review discusses the most prominent examples of morphing concepts with applications to two and threedimensional wing models. Methods and tools commonly deployed for the design and analysis of these concepts are discussed, ranging from structural to aerodynamic analyses, and from control to optimisation aspects. Throughout the review process, it became apparent that the adoption of morphing concepts for routine use on aerial vehicles is still scarce, and some reasons holding back their integration for industrial use are given. Finally, promising concepts for future use are identified.

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“…Variable-camber wings have been designed using several types of auxetic structures, including reentrant hexagonal honeycombs (Dong and Sun, 2011; Heo et al, 2013; Vigliotti and Pasini, 2015), chiral honeycombs (Airoldi et al, 2012; Bornengo et al, 2005; Martin et al, 2008; Spadoni and Ruzzene, 2007), and cross-shaped honeycombs (Zhang et al, 2012, 2014). Zero-Poisson’s-ratio honeycombs have been used in variable-span morphing wings (Ajaj et al, 2012; Bubert et al, 2010; Chen et al, 2015; Gong et al, 2015; Liu et al, 2013; Olympio and Gandhi, 2010; Vocke et al, 2012, 2015). Figure 12 shows a variable-span morphing wing with a 100% extension (Vocke et al, 2011).…”

Section: Structuresmentioning

confidence: 99%

Morphing aircraft based on smart materials and structures: A state-of-the-art review

Sun

Guan

Liu

et al. 2016

Journal of Intelligent Material Systems and Structures

267

137

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A traditional aircraft is optimized for only one or two flight conditions, not for the entire flight envelope. In contrast, the wings of a bird can be reshaped to provide optimal performance at all flight conditions. Any change in an aircraft’s configuration, in particular the wings, affects the aerodynamic performance, and optimal configurations can be obtained for each flight condition. Morphing technologies offer aerodynamic benefits for an aircraft over a wide range of flight conditions. The advantages of a morphing aircraft are based on an assumption that the additional weight of the morphing components is acceptable. Traditional mechanical and hydraulic systems are not considered good choices for morphing aircraft. “Smart” materials and structures have the advantages of high energy density, ease of control, variable stiffness, and the ability to tolerate large amounts of strain. These characteristics offer researchers and designers new possibilities for designing morphing aircraft. In this article, recent developments in the application of smart materials and structures to morphing aircraft are reviewed. Specifically, four categories of applications are discussed: actuators, sensors, controllers, and structures.

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Development of a Quasi-Static Span-Extending Blade Tip for a Morphing Helicopter Rotor

Cited by 4 publications

References 34 publications

A Review on Applications and Effects of Morphing Wing Technology on UAVs

A Review on Applications and Effects of Morphing Wing Technology on UAVs

A review of modelling and analysis of morphing wings

Morphing aircraft based on smart materials and structures: A state-of-the-art review

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