16 papers · ranked by Valyu relevance
Robert A. Van Gorder
We describe how to control the motion – both speed and propagation direction – of a nonlinear traveling wave in real time via soliton management with time-varying dispersion/diffusion and loss/gain terms. When carried out subject to certain parameter constraints we derive, the approach allows for real-time manipulation…
Sebastiano Cominelli, Carlo Sinigaglia, Davide Enrico Quadrelli, Francesco Braghin
'Francesco Braghin'] In this paper, we propose a novel approach for controlling surface water waves and their interaction with floating bodies. We consider a floating target rigid body surrounded by a control region where we design three control strategies of increasing complexity: an active strategy based on…
Enrique Zuazua
We discuss the sidewise control properties of 1-d waves. In analogy with classical control and inverse problems for wave propagation, the problem consists on controlling the behaviour of waves on part of the boundary of the domain where they propagate, by means of control actions localised on a different subset of the…
Pedro Fornaro, Jacopo Ramello, Facundo Daniel Mosquera, Giuseppe Giorgi + 1 more
This article presents a detailed description, and step-by-step process, required to build a small-scale wave energy tank demonstrator (Tiny-T). The system consists of an operative wave energy converter (WEC) with active control, representing the first demonstration of electronic WEC control at 1/100 scale. A key…
Yunzhong Wang, Damian Tohl, Anh Tran Tam Pham, Youhong Tang + 2 more
'Qiongfeng Shi' 'Najib Kacem'] The development of low-frequency and low-amplitude wave energy harvesters has been limited by the lack of an affordable scientific evaluation platform, due to the high cost and land requirements of ground-based water channels. A 3D-printed modular wave generator, combined with the…
Diego B. S. Audiffred, André V. G. Cavalieri, Pedro P. C. Brito, Eduardo Martini
'Eduardo Martini'] Reactive flow control has been shown as a promising tool to improve, among other aspects, the aerodynamic characteristics of an aircraft. This paper focuses on the use of reactive flow control to attenuate Tollmien-Schlichting (TS) waves over a wing profile. TS waves are an instability mechanism that…
Sakura Takada, Natsuhiko Yoshinaga, Nobuhide Doi, Kei Fujiwara
Reaction-diffusion coupling (RDc) generates spatiotemporal patterns, including two dynamic wave modes: traveling and standing waves. Although mode selection plays a significant role in the spatiotemporal organization of living cell molecules, the mechanism for selecting each wave mode remains elusive. Here, we…
Daniel Cebrián-Lacasa, Marcin Leda, Andrew B. Goryachev, Lendert Gelens
Cell division in large embryos is coordinated by spatial waves of Cyclin B–Cdk1 activity that spread through the cytoplasm and affect cortical contractility. However, it is still unclear how cell size and localized activation near the nucleus shape these waves, and how the cytoplasmic signal is transmitted to the…
Diego B. S. Audiffred, André V. G. Cavalieri, Igor A. Maia, Eduardo Martini + 1 more
'Eduardo Martini' 'Peter Jordan'] We present an experimental study of reactive control of turbulent jets. We target axisymmetric disturbances associated with coherent structures, which are known to underpin the peak sound radiation of turbulent jets. We first consider a forced jet flow case, such that the coherent…
Meurig T. Gallagher, Jackson C. Kirkman-Brown, David J. Smith
Flagellar motility is critical to natural and many forms of assisted reproduction. The rhythmic beating and wave propagation by the flagellum propels sperm through fluid and enables modulation between penetrative progressive motion, activated side-to-side yaw and hyperactivated movement associated with detachment from…
Uchytil, Adam, Korda, Milan + 2 more
We demonstrate the feedback control of a weakly conducting magnetohydrodynamic (MHD) flow via Lorentz forces generated by externally applied electric and magnetic fields. Specifically, we steer the flow of an electrolyte toward prescribed velocity or vorticity patterns using arrays of electrodes and electromagnets…
Eldad Afik, Toni J.B. Liu, Elliot M. Meyerowitz
Living systems often appear to act upon potential outcomes, exhibiting anticipatory behavior. Here we study Caulerpa brachypus, a marine green alga consisting of differentiated organs resembling leaves, stems and roots. While an individual can exceed a meter in size, it is a single multinucleated giant cell. Our…
Bin Dong, Shivam Mahapatra, Matthew G. Clark, Mark Carlsen + 5 more
Controlling chemical processes in live cells is a challenging task. The spatial heterogeneity of biochemical reactions in cells is often overlooked by conventional means of incubating cells with desired chemicals. A comprehensive understanding of spatially diverse biochemical processes requires precise control over…
Chong Li, Liang Shen, Jiang Shao, Jiwen Fang + 2 more
'Roman A. Surmenev'] In order to improve the vibration suppression effect of the flexible beam system, active control based on soft piezoelectric macro-fiber composites (MFCs) consisting of polyimide (PI) sheet and lead zirconate titanate (PZT) is used to reduce the vibration. The vibration control system is composed…
Lin Sun, Xu Dong Li, Xiaopei Liu
For the first time, a control strategy based on Fuzzy Sliding Mode Control is implemented in the control of a large amplitude limit cycle of a composite cantilever beam in a multi-dimensional nonlinear form. In the dynamic model establishment of the investigated structure, the higher-order shearing effect is applied…
Authors not listed
The present study investigates the transient 3D numerical prediction of the significance of passive control techniques, using triangular and rectangular span-wise pimples, placed at cambered section at the location 32% chord length from of the nose of the hydrofoil, and combined with a modified finite trailing edge…