On-Demand Aerodynamics in Integrally Actuated Membranes with Feedback Control

Buoso, Stefano; Palacios, Rafael

doi:10.2514/1.j054888

Cited by 9 publications

(9 citation statements)

References 37 publications

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“…As expected, large values of K i lead to a fast response, but can also determine undesirable oscillations around the tracked value. Additionally, as demonstrated in our previous work, the increase in K i reduces the effectiveness of the controller in the rejection of gusts (Buoso and Palacios 2017). The compromise between these two aspects led to the selection of a value of…”

Section: Controller Designmentioning

confidence: 84%

“…For details on spatial and temporal discretisations, numerical schemes and convergence criteria, the reader is referred to references (Buoso and Palacios 2015, Buoso and Palacios 2017, wherein the implementation of the proposed high-fidelity numerical model has also been verified against relevant data available in the literature. By 'highfidelity' we denote the solution of the system dynamics by standard methods, e.g.…”

Section: Methodsmentioning

confidence: 99%

“…On the numerical side, Hays et al (2013) used a numerical model for the membrane structure to postprocess the experimental results and estimate membrane stresses and thickness but, to date, only Buoso and Palacios (2015) and Buoso and Palacios (2016) have developed an electro-aeromechanical model coupling high-fidelity descriptions of both fluid and structural domains. The predictive capabilities of these models allow the investigation of strategies for realtime control of the aeroelastic response of DE membrane wings using the measured instantaneous lift coefficient, as demonstrated in a previous work from the authors for a two-dimensional case (Buoso and Palacios 2017). However, some results have also shown that the upper frequency limit of the disturbances that can be efficiently compensated with a feedback-only approach is not high enough for outdoor conditions.…”

Section: S Buoso Et Almentioning

confidence: 99%

“…Therefore, we have also developed a methodology for the reduced-order description of the coupled electro-aeromechanical system (Buoso and Palacios 2017). The system reduction is achieved by projecting the full description onto a basis formed by structural eigenmodes and fluid proper orthogonal decomposition modes obtained for a pre-selected training signal.…”

Section: Model Reductionmentioning

confidence: 99%

“…This allows the use of a single sensor for both feedback and feedforward contributions. A more detailed description of the full control architecture can be found in the appendix, and a detailed analysis on the design approach in Buoso and Palacios (2017). As a note, throughout the manuscript we often use the term performance or root mean square (RMS) to refer to the RMS values of the difference between the instantaneous lift coefficient and the reference one.…”

Section: Control System Designmentioning

confidence: 99%

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Bat-inspired integrally actuated membrane wings with leading-edge sensing

2017

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This paper presents a numerical investigation on the closed-loop performance of a two-dimensional actuated membrane wing with fixed supports. The proposed concept mimics aerodynamic sensing and actuation mechanisms found in bat wings to achieve robust outdoor flight: firstly, variable membrane tension, which is obtained in bats through skeleton articulation, is introduced through a dielectric-elastomer construction; secondly, leading-edge airflow sensing is achieved with bioinspired hair-like sensors. Numerical results from a coupled aero-electromechanical model show that this configuration can allow for the tracking of prescribed lift coefficient signals in the presence of disturbances from atmospheric gusts. In particular, disturbance measurements through the hair sensor (a feedforward control strategy) are seen to provide substantial advantage with respect to a reactive (feedback) control strategy determining a reduction of the oscillations of the lift coefficient.

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Section: Controller Designmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: S Buoso Et Almentioning

confidence: 99%

Section: Model Reductionmentioning

confidence: 99%

Section: Control System Designmentioning

confidence: 99%

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Bat-inspired integrally actuated membrane wings with leading-edge sensing

2017

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Reduced-order modeling of blood flow for noninvasive functional evaluation of coronary artery disease

Buoso

Manzoni

Alkadhi

et al. 2019

Biomech Model Mechanobiol

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We present a novel computational approach, based on a parametrized reduced-order model, for accelerating the calculation of pressure drop along blood vessels. Vessel lumina are defined by a geometric parametrization using the discrete empirical interpolation method on control points located on the surface of the vessel. Hemodynamics are then computed using a reduced-order representation of the parametrized three-dimensional unsteady Navier-Stokes and continuity equations. The reduced-order model is based on an offline-online splitting of the solution process, and on the projection of a finite volume full-order model on a low-dimensionality subspace generated by proper orthogonal decomposition of pressure and velocity fields. The algebraic operators of the hemodynamic equations are assembled efficiently during the online phase using the discrete empirical interpolation method. Our results show that with this approach calculations can be sped up by a factor of about 25 compared to the conventional full-order model, while maintaining prediction errors within the uncertainty limits of invasive clinical measurement of pressure drop. This is of importance for a clinically viable implementation of noninvasive, medical imaging-based computation of fractional flow reserve.

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