Topic
Bimorph
About: Bimorph is a research topic. Over the lifetime, 3339 publications have been published within this topic receiving 51880 citations.
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TL;DR: In this article, a piezoresistive cantilever is used for atomic force microscopy (AFM) detection, which improves surface topography resolution by an order of magnitude to 0.1nm.
31 citations
TL;DR: In this paper, the effects of ambient temperature on the level of harvesting energy from galloping oscillations of a bluff body are investigated and a nonlinear-distributed-parameter model is developed to determine variations in the onset speed of galloping and the harvested power when the ambient temperature is varied.
Abstract: The effects of ambient temperature on the level of harvesting energy from galloping oscillations of a bluff body are investigated. A nonlinear-distributed-parameter model is developed to determine variations in the onset speed of galloping and the level of the harvested power when the ambient temperature is varied. The considered harvester consists of a bimorph piezoelectric cantilever beam with a prismatic-structure tip mass. A modal analysis is performed to derive the exact mode shapes and natural frequencies of the beam‐structure system and their dependence on temperature variations. The quasi-steady representation is used to model the aerodynamic loads. The linear analysis shows that the temperature and the electrical load resistance affect the onset speed of galloping significantly. The nonlinear analysis shows that temperature variation affects the level of the harvested power. (Some figures may appear in colour only in the online journal)
31 citations
TL;DR: It is shown that the time constant of the probe can be reduced by reducing its quality factor and/or increasing its resonance frequency to reduce the scan error in tapping mode AFM.
Abstract: We adjust the transient dynamics of a piezoactuated bimorph atomic force microscopy (AFM) probe using a state feedback controller. This approach enables us to adjust the quality factor and the resonance frequency of the probe simultaneously. First, we first investigate the effect of feedback gains on dynamic response of the probe and then show that the time constant of the probe can be reduced by reducing its quality factor and/or increasing its resonance frequency to reduce the scan error in tapping mode AFM.
31 citations
TL;DR: In this article, the performance of a parametrically excited bimorph piezoelectric energy harvester is investigated for the first time, where the performance is significantly enhanced via use of stoppers and an added tip mass in conjunction with parametric excitation.
31 citations
TL;DR: Based on the Bernoulli?Euler plate model including the dynamics of piezoelectric, electrode and substrate layers, this paper obtained the natural frequencies, maximum displacement and resultant force of a symmetric cantilevered multimorph.
Abstract: This paper deals with the static and dynamic electromechanical responses of piezoelectric layered structures (multimorphs). Based on the Bernoulli?Euler plate model including the dynamics of piezoelectric, electrode and substrate layers, we obtain the natural frequencies, maximum displacement and resultant force of a symmetric cantilevered multimorph. The proposed theoretical model is verified by experiments using a 20-layered PZT (plumbum?zirconate?titanate) multimorph, and it is compared to the conventional bimorph model. Experimental results agree with the analytical predictions on the natural frequencies and vertical displacement. With the analytical solution for multimorph, we investigate the effects of the layer number and the layer thickness on natural frequency, maximum deflection and output force. It is found that there exists an optimum number of piezoelectric layers to maximize the transverse deflection. There also exists a specific value of the thickness ratio between piezoelectric and structure layers to maximize both the tip deflection and force.
31 citations