A Beam-Tendon System with an Eccentrically Mounted Tendon: Parametric Studies

Ondra, Václav; Titurus, Brano; Woods, Benjamin K.S.

doi:10.2514/6.2020-0697

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…A well-defined strategy is at the basis of the Project of SABRE. The different morphing concepts involving the blade chord, chamber and twist [7]- [12] are investigated considering their impact on rotorcraft performance and layout and their feasibility and TRL [13] In line with this philosophy, surrogate predictive models were tailored on the morphing system peculiarities and progressive demonstrative events-gates were planned to assess the technology maturity of the architectures. In the schematic of Figure 1, the development path of the above mentioned SMA blade twist system is shown while the relevant phases are described in the following sections.…”

Section: Technology Development Pathmentioning

confidence: 99%

SMA blade twist system: from the requirements to the demonstration in relevant environment

Ameduri

Ciminello

Curnis

et al. 2023

Active and Passive Smart Structures and Integrated Systems XVII

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In the present work, an overview is provided on the activities performed by CIRA, DLR and Univ of Bristol to develop and test a morphing system aimed at altering the twist of a blade to enhance the performance of the main rotor. The activities were performed within the research Project of “Shape Adaptive Blades for Rotorcraft Efficiency” (SABRE, H2020, 2017-2021), a Consortium constituted by six Partners (Univ. of Bristol – leader, Univs. of Munich, Delft and Swansea and the research centers of DLR and CIRA). Moving from the original features of the blade and the requirements of the reference rotorcraft, a layout of the architecture was sketched. A refined numerical model was then implemented to accurately predict the functionality of the concept and verify its safety compliance with the test facilities it was conceived for. Laboratory tests were thus performed on a dedicated prototype. Finally, on this basis, two other demonstrators were built and finally tested in the just mentioned wind tunnel and whirl tower plants.

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Section: Technology Development Pathmentioning

confidence: 99%

SMA blade twist system: from the requirements to the demonstration in relevant environment

Ameduri

Ciminello

Curnis

et al. 2023

Active and Passive Smart Structures and Integrated Systems XVII

View full text Add to dashboard Cite

show abstract

“…Room, weight, and shape constraints are really hard to meet with traditional technology, even considering the necessity connected to the cabling, installation, maintenance, and so on. It should be noted that the literature is rich with examples that target the blade morphing through non-monolithic devices, originally conceived and deployed [11][12][13]. It is clear that devices with minimal intrusiveness, easiness of command, and with the capability of addressing load-bearing issues, maybe substituting original elements, would be very suitable for that scope.…”

Section: Introductionmentioning

confidence: 99%

Whirl Tower Demonstration of an SMA Blade Twist System

et al. 2022

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This paper focuses on the development and demonstration of a novel blade morphing system within a whirl tower facility. The scope is to investigate the behavior of the proposed architecture under representative loads, demonstrating its capability to alter the blade original shape in operation under centrifugal, aerodynamic, and internal forces. The morphing concept was developed inside the European project “Shape Adaptive Blades for Rotorcraft Efficiency”, SABRE, and consists of a shape memory alloy system able to change the original twist law and, in this way, enhance rotor performance at certain specific regimes, such as hover and vertical flight. These phases, indeed, are generally penalized with respect to other more extended flight regimes (cruise). The work starts with an overview of the research in the field of morphing, with specific reference to the researches envisaging rotary wing demonstrations. Then, an overview of the morphing twist concept is provided, with particular attention paid to those features particularly suited for the whirl tower representative test environment. The laboratory characterization and commissioning operations are illustrated. Then, the task of the installation of the prototype on the whirl tower facility is described together with the testing modality adopted. Finally, the results of the test campaign are illustrated and critically discussed, providing the reader with insights and possible future steps to be taken in further research. The impact on the morphing capability of the following different parameters was investigated: the number of the prototype segments switched on, the speed and thus the centrifugal actions, and the angles of attack. The stiffening effect due to centrifugal actions was quantified through the measurement of the actual twist and the internal deformation. The link between speed, angle of attack at root, and twist and flap angles was also tracked, building a database useful for the comprehension of the phenomenon, and for the assessment of numerical predictive models. The achieved results highlighted the capability of the system to produce a twist angle matching the target of 8° per blade radius; this figure is related to a potential power saving of 10% in hover and vertical flight and an improvement of about 1% on the over-all efficiency of the rotorcraft.

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A Beam-Tendon System with an Eccentrically Mounted Tendon: Parametric Studies

Cited by 2 publications

References 9 publications

SMA blade twist system: from the requirements to the demonstration in relevant environment

SMA blade twist system: from the requirements to the demonstration in relevant environment

Whirl Tower Demonstration of an SMA Blade Twist System

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