Searched for: subject:"actuator"
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Tijmons, S. (author)
Many types of drones have emerged over the last decade and new applications in various sectors are announced almost on a daily basis. In scientific literature, small drones are called Micro Air Vehicles (MAVs). Especially very small MAVs will play a significant role in indoor applications, since their small size allows them to navigate in narrow...
doctoral thesis 2017
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Zong, H. (author), Kotsonis, M. (author)

The performance of a two–electrode plasma synthetic jet actuator (PSJA) is investigated for a wide range of dimensionless actuation frequencies (f*) using high-speed phase-locked Particle Imaging Velocimetry (PIV) measurements. The jet-induced velocity fields in the axisymmetric plane are measured during both...

journal article 2017
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Michelis, T. (author)
The research presented in this thesis focuses on boundary layer separation and, more specifically, on the related physical mechanisms, such as laminar to turbulent transition, with a vision towards effective separation control. The work is divided in three parts, each corresponding to a different separation scenario. The supporting data is...
doctoral thesis 2017
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Yang, Y. (author), Veldhuis, L.L.M. (author), Eitelberg, G. (author)

Abstract: During the ground operation of aircraft, the interaction between the propulsor-induced flow field and the ground may lead to the generation of ground vortices. Utilizing numerical approaches, the source of vorticity entering ground vortices is investigated. The results show that the production of wall-parallel components of...

journal article 2017
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Herdeiro Teixeira, A.M. (author), Araujo, Jose (author), Sandberg, Henrik (author), Johansson, Karl H. (author)

In this paper, we address the problem of distributed reconfiguration of networked control systems upon the removal of misbehaving sensors and actuators. In particular, we consider systems with redundant sensors and actuators cooperating to recover from faults. Reconfiguration is performed while minimizing a steady-state estimation error...

journal article 2017
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Jang, S.H. (author), Na, Seon Hong (author), Park, Yong Lae (author)

This article presents a soft pneumatic bending actuator using a magnetically assisted bilayer composite composed of silicone polymer and ferromagnetic particles. Bilayer composites were fabricated by mixing ferromagnetic particles to a prepolymer state of silicone in a mold and asymmetrically distributed them by applying a strong non-uniform...

journal article 2017
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Yarusevych, S. (author), Kotsonis, M. (author)

This work examines the effect of local active flow control on stability and transition in a laminar separation bubble. Experiments are performed in a wind tunnel facility on a NACA 0012 airfoil at a chord Reynolds number of 130 000 and an angle of attack of 2 degrees. Controlled disturbances are introduced upstream of a laminar separation...

journal article 2017
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Plooij, M.C. (author), Wolfslag, W.J. (author), Wisse, M. (author)
This paper identifies the class of actuators called clutched elastic actuators (CEAs). CEAs use clutches to control the energy flow into springs. CEAs in exoskeletons, prostheses, legged robots, and robotic arms have shown the ability to reduce the energy consumption and motor requirements, such as peak torque and peak power. Because of those...
journal article 2017
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van der Weijde, J.O. (author), Smit, B. (author), Fritschi, M. (author), van de Kamp, C. (author), Vallery, H. (author)

The recently introduced twisted and coiled polymer muscle is an inexpensive and lightweight compliant actuator. Incorporation of themuscle in applications that rely on feedback creates the need for deflection and force sensing. In this paper, we explore a sensing principle that does not require any bulky or expensive additional hardware: Self...

journal article 2017
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Krijnen, M.E. (author), van Ostayen, R.A.J. (author), Hossein Nia Kani, S.H. (author)
Industry pushes towards ever faster and more accurate production of thin substrates. Contactless positioning offers advantages, especially in terms of risk of breakage and contamination. A system is considered designed for contactless positioning by floating a silicon wafer on a thin film of air. This paper focuses on the design of a control...
journal article 2017
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Aiple, M. (author), Schiele, A. (author)
Variable stiffness actuators undergo lower peak force in contacts compared to their rigid counterparts, and are thus safer for human-robot interaction. Furthermore, they can store energy in their elastic element and can release it later to achieve human-like dynamic movements. However, it is not clear how to integrate them in teleoperator...
conference paper 2017
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van de Ven, Oscar (author), Vogel, J.G. (author), Xia, Sha (author), Spronck, J.W. (author), Nihtianov, S. (author)
High-precision positioning often requires high speed and high resolution displacement measurements in order to compensate for the small vibrations of critical components. The displacement sensor must be precise and stable over a long period of time to avoid expensive recalibration. This requires tight mounting tolerances, which are especially...
journal article 2017
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van de Ven, O.S. (author)
Sensor positioning is critical for achieving a measurement accuracy in the picometre range with capacitive displacement sensors. This thesis discusses the contradictory requirements that the sensor alignment application imposes: motion capability combined with extreme displacement stability. In addition, it explores three micrometre scale...
doctoral thesis 2016
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Balbino Dos Santos Pereira, R. (author)
The contribution of sustainable Wind Energy (WE) to the global energy scenario has been
steadily increasing over the past decades. In the process, Horizontal Axis Wind Turbines
(HAWT) became the most widespread and largest WE harvesting machines. Nevertheless,
significant challenges still lie ahead of further expansion of HAWT,...
doctoral thesis 2016
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Lu, P. (author)
doctoral thesis 2016
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Lara-Quintanilla, A. (author)
The design of aerodynamic airfoils are optimized for certain conditions. For instance, the shape of the wings of fixed-wing aircrafts are designed and optimized for a certain flight condition (in terms of altitude, speed, aircraft weight, etc.). However, these flight conditions vary significantly during the flight. Currently, aircraft are...
doctoral thesis 2016
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Peters, H.J. (author)
This thesis studies a controllability approach for general resonant compliant systems. These systems exploit resonance to obtain a specific dynamic response at relatively low actuation power. This type of systems is often lightweight, is scalable and minimizes frictional losses through the use of compliant hinges. Some insect-inspired Flapping...
doctoral thesis 2016
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Popov, I. (author)
Nanosecond dielectric barrier discharge (NS-DBD) plasma actuators is relatively
new means of flow control. It has several advantages compared to more conventional
means of flow control, such as small size, low weight, fast response time
and controllability. It has been demonstrated to be able to promote transition of
boundary...
doctoral thesis 2016
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Correale, G. (author)
An experimental investigation about nanosecond Dielectric Barrier Discharge (ns-DBD) plasma actuator is presented in this thesis. This work aimed to answer fundamental questions on the actuation mechanism of this device. In order to do so, parametric studies in a quiescent air as well as laminar bounded of free shear layers were performed....
doctoral thesis 2016
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Peters, T.J. (author), Tichem, M. (author)

This paper reports on the progress related to a multichannel photonic alignment concept, aiming for sub-micrometer precision in the alignment of the waveguides of two photonic integrated circuits (PICs). The concept consists of two steps: chip-to-chip positioning and chip bonding provide a coarse alignment after which waveguide-to-waveguide...

conference paper 2016
Searched for: subject:"actuator"
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