Structural and Systems Modelling of a Fluid-driven Morphing Winglet Trailing Edge

Vasista, Srinivas; Titze, Maik; Schäfer, Michael; Bertram, Oliver; Riemenschneider, Johannes; Monner, Hans Peter

doi:10.2514/6.2020-2010

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Although, these pressure generation methods do not meet performance requirements, such as maximum pressure and continuous flow rate, which are essential for the intended aeronautical application. Vasista et al evaluate different pneumatic and hydraulic system architectures for a fluid-driven morphing winglet trailing edge at an early conceptual stage [29]. However, none of the pressure-driven concepts has, so far, been investigated with regard to the flow inside the structure and transient dynamic behavior.…”

Section: Introductionmentioning

confidence: 99%

Transient Dynamic System Behavior of Pressure Actuated Cellular Structures in a Morphing Wing

et al. 2021

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High aspect ratio aircraft have a significantly reduced induced drag, but have only limited installation space for control surfaces near the wingtip. This paper describes a multidisciplinary design methodology for a morphing aileron that is based on pressure-actuated cellular structures (PACS). The focus of this work is on the transient dynamic system behavior of the multi-functional aileron. Decisive design aspects are the actuation speed, the resistance against external loads, and constraints preparing for a future wind tunnel test. The structural stiffness under varying aerodynamic loads is examined while using a reduced-order truss model and a high-fidelity finite element analysis. The simulations of the internal flow investigate the transient pressurization process that limits the dynamic actuator response. The authors present a reduced-order model based on the Pseudo Bond Graph methodology enabling time-efficient flow simulation and compare the results to computational fluid dynamic simulations. The findings of this work demonstrate high structural resistance against external forces and the feasibility of high actuation speeds over the entire operating envelope. Future research will incorporate the fluid–structure interaction and the assessment of load alleviation capability.

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Section: Introductionmentioning

confidence: 99%

Transient Dynamic System Behavior of Pressure Actuated Cellular Structures in a Morphing Wing

et al. 2021

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“…Shape-flexible structures and components made of fiber-reinforced composites enable mass savings but can also achieve significantly improved aerodynamic efficiency, for example, as a component of morphing wing technologies. Examples of this are the work on the ‘FlexFoil system’ (Kota et al [ 4 ]), the ‘vertebrate structure’ (Elzey et al [ 5 ]), or the ‘droop nose’ (Vasista et al [ 6 ]). However, the problem with these concepts is the system-inherent contradiction between the required compliance and the necessary structural stiffness and strength.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Composites for Integrally Woven Pressure Actuated Cellular Structures: Design Approach and Material Investigation

et al. 2021

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The use of pressure-actuated cellular structures (PACS) is an effective approach for the application of compliant mechanisms. Analogous to the model in nature, the Venus flytrap, they are made of discrete pressure-activated rows and can be deformed with high stiffness at a high deformation rate. In previous work, a new innovative approach in their integral textile-based manufacturing has been demonstrated based on the weaving technique. In this work, the theoretical and experimental work on the further development of PACS from simple single-row to double-row PACS with antagonistic deformation capability is presented. Supported by experimental investigations, the necessary adaptations in the design of the textile preform and the polymer composite design are presented and concretized. Based on the results of pre-simulations of the deformation capacity of the new PACS, their performance was evaluated, the results of which are presented.

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“…We refer to compliance selectivity as the capacity for structures to alter their stiffness as a function of time, in contrast to structures with spatially distributed reinforcements that show time-invariant, spatially varying modulus. 19 The type of selective compliance we explore in this paper can be achieved, for example, using mechanistic approaches, 20,21 by pressurized composites, 22,23 or bistable beam-like elements inside truss-like compliant systems. [24][25][26][27][28] Structures displaying such selectively compliant behavior leverage geometric effects that are independent of the constitutive material used.…”

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confidence: 99%

Passive load alleviation on wind turbine blades from aeroelastically driven selectively compliant morphing

Cavens¹,

Chopra

Arrieta

2020

Wind Energy

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Load alleviation control is highly desirable to reduce penalties associated with the added structural mass required to withstand rare load scenarios. This is particularly true for wind turbine designs incorporating long-span blades. Implementation of compliance-based morphing structures to modify the lift distribution passively has the potential to mitigate the impact of rare, but integrally threatening, loads on wind turbine blades while limiting the addition of actuation and sensing systems. We present a novel passive load alleviation concept based on a morphing flap exhibiting selective compliance from an embedded bistable element. A multifidelity, aeroelastic tool is used to study the shape adaptability of a morphing flap indicating that passive changes from high lift generation to load alleviation configurations can be achieved by exploiting the energy of the flow. This mechanism offers a method to reduce catastrophic peak loads potentially, thus offering the possibility to lower the overall structural weight of wind turbine blades.

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Structural and Systems Modelling of a Fluid-driven Morphing Winglet Trailing Edge

Cited by 6 publications

References 20 publications

Transient Dynamic System Behavior of Pressure Actuated Cellular Structures in a Morphing Wing

Transient Dynamic System Behavior of Pressure Actuated Cellular Structures in a Morphing Wing

Thermoplastic Composites for Integrally Woven Pressure Actuated Cellular Structures: Design Approach and Material Investigation

Passive load alleviation on wind turbine blades from aeroelastically driven selectively compliant morphing

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