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Lee, M. (author), Renshof, Johannes R. (author), van Zeggeren, K.J. (author), Houmes, M.J.A. (author), Lesne, E.L. (author), Siskins, M. (author), van Thiel, T.C. (author), Guis, R.H. (author), van Blankenstein, M.R. (author), Verbiest, G.J. (author), Caviglia, A. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author)Suspended piezoelectric thin films are key elements enabling high-frequency filtering in telecommunication devices. To meet the requirements of next-generation electronics, it is essential to reduce device thickness for reaching higher resonance frequencies. Here, the high-quality mechanical and electrical properties of graphene electrodes...journal article 2022
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Pilz da Cunha, Marina (author), Foelen, Yari (author), Engels, Tom A.P. (author), Papamichou, K. (author), Hagenbeek, M. (author), Debije, Michael G. (author), Schenning, Albert P.H.J. (author)The integration of untethered, multi-stimuli responsive actuation into soft microrobotic devices is a goal in the development of “smart” materials. This manuscript reports on a dual-stimuli responsive bilayer actuator consisting of a light responsive liquid crystal network (LCN) and a magnetic responsive polydimethylsiloxane (PDMS) composite....journal article 2019
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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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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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Thomas, S. (author), Jovic, A. (author), Morana, B. (author), Buja, F. (author), Gkouzou, A. (author), Pandraud, G. (author), Sarro, Pasqualina M (author)In this paper we present the characterization of the coefficient of thermal expansion (CTE) of in-situ doped polycrystalline SiC thin films, obtained by low pressure chemical vapor deposition (LPCVD). The material is characterized using V-beam actuators on which the temperature coefficient of resistance (TCR) and the in-plane displacement...journal article 2016
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Ren, Y. (author), Hayton, D.J. (author), Hovenier, J.N. (author), Cui, M. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)We demonstrate an experimental scheme to simultaneously stabilize the frequency and amplitude of a 3.5 THz third-order distributed feedback quantum cascade laser as a local oscillator. The frequency stabilization has been realized using a methanol absorption line, a power detector, and a proportional-integral-derivative (PID) loop. The amplitude...journal article 2012
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Kotsonis, M. (author), Ghaemi, S. (author)The forcing behavior of a dielectric barrier discharge (DBD) actuator is investigated experimentally using a time-resolved particle image velocimetry (PIV) system in conjunction with a phase shifting technique. The spatio-temporal evolution of the induced flowfield is accurately captured within one high voltage (HV) cycle allowing the...journal article 2011
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Leirens, S. (author), Zamora, C. (author), Negenborn, R.R. (author), De Schutter, B. (author)Urban water supply networks are large-scale systems that transport potable water over vast geographical areas to millions of consumers. A safe and efficient operation of these networks is crucial, as without it living in today’s cities would be impossible. To achieve an adequate operation, these networks are equipped with actuators like pumps...conference paper 2010
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Schiele, A. (author)This thesis is the first to provide the fundamentals of ergonomic exoskeleton design. The fundamental theory as well as technology necessary to analyze and develop ergonomic wearable robots interacting with humans is established and validated by experiments and prototypes. The fundamentals are (1) a new theoretical framework for analyzing...doctoral thesis 2008
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- Wolffenbuttel, R.F. (author) book 1996
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van Woerkom, P.T.L.M. (author)Software design for digital computer simulation of the dynamics of flexible spacecraft equipped with actuators and sensors, should take into account two properties of the overall system: (i) s.ampled-data control of the spacecraft leads to discontinuous inputs (forcing functions) in the differential equations of motion, thereby requiring...report 1983
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Bosgra, J.A. (author), Prins, J.J.M. (author)The first part of the paper presents the results of measurements on torque and force irregularities of running reaction wheels. Six different, current technology European wheels, both with ball- and magnet bearings, and with d.c. and a.c. drive motors are examined. Time-domain behaviour around zero wheel speed as well as noise at certain...report 1982
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Erkelens, L.J.J. (author), Schuring, J. (author)For the low wing-loading aircraft, considered in this investigation, vertical acceleration appeared to be an important factor concerning passenger comfort. To reduce vertical motions, a ride-comfort improvement system was introduced. Determination of parameters of the system, like gains and allowable performance limitations, required analog...report 1975