Results 211 to 220 of about 7,594 (251)
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A transparent polymeric flexure-hinge nanopositioner, actuated by a piezoelectric stack actuator
Nanotechnology, 2011Nanopositioning using piezoelectric actuation and a flexure mechanism is one of most common methods for nanometre-scale positioning. Generally, flexure mechanism nanopositioners have been made from metal. Thus, their application to various environments needs careful consideration with regard to corrosion and circumference interference.
Ki Woon, Chae +2 more
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A Laser Scanner Using Stacked Piezoelectric Ceramic Actuator
Japanese Journal of Applied Physics, 1986A laser scanner using the displacement of two stacked piezo-electric ceramic actuators (Piezo-Stacks) has been developed. This scanner is capable of simultaneously scanning both X and Y axes up to 4.0 mrad at frequencies as high as 1.0 kHz. Possible uses include automated precise positioning of optics and lasers for LSI applications.
Makoto Okuda +4 more
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Dynamic Peculiarity of Piezoelectric-Stack Displacement-Amplifying Actuator
Applied Mechanics and Materials, 2011In order to find out the dynamic peculiarity of piezoelectric-stack displacement-amplifying actuator, three methods: harmonic response analysis, impedance test and dynamic grating projection are used to analyze it. Experimental results indicate that the displacement-amplifying mechanism can provide large output torque; its response time is less than 0 ...
Hong Jin +3 more
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Modeling of piezoelectric stack actuators considering bonding layers
Journal of Intelligent Material Systems and Structures, 2015In order to achieve large displacement output of piezoelectric actuators, piezoelectric stack actuators are realized by mechanically layering or stacking multi-chip piezoelectric wafers in series and electronically connecting electrodes in parallel.
Wei Zhu, Gangli Chen, Xiaoting Rui
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Electro-Dynamic Transduction Equations for Piezoelectric Stack Actuators
Adaptive Structures and Composite Materials: Analysis and Application, 1994Abstract In this paper the transduction equations needed to predict the electro-dynamic behavior of piezoelectric stack actuators are derived. An impedance approach is used to develop the parameters; free electrical impedance, transduction coefficient, and short circuited mechanical impedance, needed to fully characterize the ...
Eric M. Flint +2 more
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Modal Active Vibration Control of a Rotor Using Piezoelectric Stack Actuators
Journal of Vibration and Control, 2007This work deals with active vibration control of a rotating machine in both steady state and transient motion. Two stacks of piezoelectric ceramic orthogonally arranged in a plane localized at one of the bearings were used as the control actuators, using a modal control strategy.
Simoes, Ricardo +3 more
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Active control of structural vibration by piezoelectric stack actuators
Journal of Zhejiang University-SCIENCE A, 2005Summary: This paper presents a general analytical model of flexible isolation system for application to the installation of high-speed machines and lightweight structures. Piezoelectric stack actuators are employed in the model to achieve vibration control of flexible structures, and dynamic characteristics are also investigated.
Niu, Junchuan, Zhao, Guoqun, Hu, Xiaxia
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A hysteresis model for a stacked-type piezoelectric actuator
Mechanics of Advanced Materials and Structures, 2016ABSTRACTThe hysteresis nonlinearity in piezoelectric materials brings difficulties in controlling the systems. In order to mitigate the effect of hysteresis, such nonlinearity needs to be characterized and modeled under different load circumstances. For this purpose, the actuator is modeled in terms of a mass-spring-damper system utilizing the stop ...
Vahid Hassani, Tegoeh Tjahjowidodo
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Whole-spacecraft active vibration isolation using piezoelectric stack actuators
2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics, 2010The problem of active vibration isolation for a new type of whole-spacecraft vibration isolation system (WSVIS) is studied in order to improve the whole-spacecraft vibration isolation performance. Piezoelectric stack is selected as the actuator, and its dynamical equations are formulated.
Ming-ming Li +3 more
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Tracking control of a distributed-parameter piezoelectric stack actuator
2009 European Control Conference (ECC), 2009The combination of flatness-based trajectory planning and feedforward control with asymptotically stabilizing dynamic feedback control is considered for the tracking control of a distributed-parameter model of a piezoelectric stack actuator.
Thomas Meurer +2 more
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