Searched for: subject:"actuator"
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document
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
document
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
document
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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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
document
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
document
Lu, P. (author)
doctoral thesis 2016
document
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
document
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
document
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
document
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
document
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
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Wu, K. (author), Peters, T.J. (author), Tichem, M. (author), Postma, Ferry (author), Prak, Albert (author), Wörhoff, Kerstin (author), Leinse, Arne (author)

This paper proposes and tests a design of electro-thermal bimorph actuators for alignment of flexible photonic waveguides fabricated in 16 μm thick SiO2. The actuators are for use in a novel alignment concept for multi-port photonic integrated circuits (PICs), in which the fine alignment is taken care of by positioning of suspended...

conference paper 2016
document
Correale, G. (author), Avallone, F. (author), Yu Starikovskiy, A. (author)
A method to quantify the efficiency of the first two operational stages of a nanosecond dielectric barrier discharge (ns-DBD) plasma actuator is proposed. The method is based on the independent measurements of the energy of electrical pulses and the useful part of the energy which heats up the gas in the discharge region. Energy input is...
journal article 2016
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Zong, H. (author), Kotsonis, M. (author)
An experimental characterisation study of a large-volume three-electrode plasma synthetic jet actuator (PSJA) is presented. A sequential discharge power supply system is used to activate the PSJA. Phase-locked planar particle image velocimetry (PIV) and time-resolved Schlieren imaging are used to characterise the evolution of the induced flow...
journal article 2016
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Zong, H. (author), Kotsonis, M. (author)
A simplified model is established to estimate the jet exit density variation of a plasma synthetic jet actuator (PSJA) driven by a capacitive arc discharge. This model, in conjunction with phase-locked planar particle imaging velocimetry (PIV) measurements, enables the calculation of jet mechanical energy for different operating conditions....
journal article 2016
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Yu, W. (author), Simao Ferreira, C. (author), van Kuik, G.A.M. (author), Baldacchino, D. (author)
Although the Blade Element Momentum method has been derived for the steady conditions, it is used for unsteady conditions by using corrections of engineering dynamic inflow models. Its applicability in these cases is not yet fully verified. In this paper, the validity of the assumptions of quasi-steady state and annuli independence of the blade...
journal article 2016
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Plooij, M.C. (author), Wisse, M. (author), Vallery, H. (author)

Parallel elastic actuators (PEAs) have shown the ability to reduce the energy consumption of robots. However, regular PEAs do not allow us to freely choose at which instant or configuration to store or release energy. This paper introduces the concept and design of the bidirectional clutched parallel elastic actuator (BIC-PEA), which reduces...

journal article 2016
document
Wiwattananon, P. (author), Bergsma, O.K. (author), Bersee, H.E.N. (author)
Piezoelectric materials possess nonlinear behavior when actuated in a large electric field and show a large deflection when embedded inside a composite laminate such as a LIghtweight Piezoelectric Composite Actuator. Linear and nonlinear COMSOL multi-physics finite element models were developed and validated using the actuation response of three...
journal article 2016
Searched for: subject:"actuator"
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