The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
John E Sader - One of the best experts on this subject based on the ideXlab platform.
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frequency response of Cantilever Beams immersed in viscous fluids near a solid surface with applications to the atomic force microscope
Journal of Applied Physics, 2005Co-Authors: Christopher P Green, John E SaderAbstract:Theoretical models for the frequency response of a Cantilever beam immersed in a viscous fluid commonly assume that the fluid is unbounded. Experimental measurements show, however, that proximity to a surface can significantly affect the frequency response of a Cantilever beam. In this article, we rigorously calculate the effect of a nearby surface on the frequency response of a Cantilever beam immersed in a viscous fluid, and present a general theoretical model. Due to its practical relevance to applications of the atomic force microscope and microelectromechanical systems, detailed results are presented for Cantilever Beams with rectangular geometries executing flexural and torsional oscillations. It is found that dissipative loading in the fluid is primarily responsible for the observed variation in the frequency response, whereas inertial loading exerts a relatively weak influence.
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experimental validation of theoretical models for the frequency response of atomic force microscope Cantilever Beams immersed in fluids
Journal of Applied Physics, 2000Co-Authors: James W M Chon, Paul Mulvaney, John E SaderAbstract:Detailed measurements of the frequency responses of a series of rectangular atomic force microscope (AFM) Cantilever Beams, immersed in a range of fluids, have been performed to test the validity and accuracy of the recent theoretical model of Sader [J. Appl. Phys. 84, 64 (1998)]. This theoretical model gives the frequency response of a Cantilever beam, that is immersed in a viscous fluid and excited by an arbitrary driving force. Very good agreement between experimental measurements and theoretical calculations is found for all fluids considered. Furthermore, a critical assessment of the well-known inviscid model is presented, which demonstrates that this model is not applicable to AFM Cantilever Beams in general.
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frequency response of Cantilever Beams immersed in viscous fluids with applications to the atomic force microscope
Journal of Applied Physics, 1998Co-Authors: John E SaderAbstract:The vibrational characteristics of a Cantilever beam are well known to strongly depend on the fluid in which the beam is immersed. In this paper, we present a detailed theoretical analysis of the frequency response of a Cantilever beam, that is immersed in a viscous fluid and excited by an arbitrary driving force. Due to its practical importance in application to the atomic force microscope (AFM), we consider in detail the special case of a Cantilever beam that is excited by a thermal driving force. This will incorporate the presentation of explicit analytical formulae and numerical results, which will be of value to the users and designers of AFM Cantilever Beams.
Sondipon Adhikari - One of the best experts on this subject based on the ideXlab platform.
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Sensor shape design for piezoelectric Cantilever Beams to harvest vibration energy
Journal of Applied Physics, 2010Co-Authors: Michael I. Friswell, Sondipon AdhikariAbstract:Energy harvesting for the purpose of powering low power electronic sensor systems has received explosive attention in the last few years. A common device uses the piezoelectric effect for a Cantilever Beams at resonance to harvest ambient vibration energy. However most of these devices have a rectangular piezoelectric patch covering all or part of the beam. This paper considers the optimum design of such a device, and in particular investigates the effect that the size and shape of piezoelectric sensor has on the harvested energy. It is shown that significant increases in harvested energy may be obtained by optimising the sensor design.
Guang Meng - One of the best experts on this subject based on the ideXlab platform.
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design and experimental investigation of a magnetically coupled vibration energy harvester using two inverted piezoelectric Cantilever Beams for rotational motion
Energy Conversion and Management, 2017Co-Authors: Hongxiang Zou, Wenming Zhang, Kexiang Wei, Qiuhua Gao, Zhike Peng, Guang MengAbstract:Abstract Energy can be harvested from rotational motion for powering wireless autonomous electronic devices. The paper presents a magnetically coupled two-degree-of-freedom vibration energy harvester for rotary motion applications. The design consists of two inverted piezoelectric Cantilever Beams whose free ends point to the rotating shaft. The centrifugal force of the inverted Cantilever beam is beneficial to producing large amplitude in a low speed range. The electromechanical coupling dynamical model is developed by the energy method from Hamilton’s principle and validated experimentally. The experimental results indicate that the presented harvester is suitable for low speed rotation and can harvest vibration energy in multiple frequency bands. The first and second resonant behaviors of voltage can be obtained at 420 r/min and 550 r/min, and the average output powers are 564 μW and 535.3 μW, respectively.
Angus J Wilkinson - One of the best experts on this subject based on the ideXlab platform.
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anisotropy in the plastic flow properties of single crystal α titanium determined from micro Cantilever Beams
Acta Materialia, 2009Co-Authors: Jicheng Gong, Angus J WilkinsonAbstract:Abstract Single-crystal micro-Cantilever Beams were manufactured from a polycrystalline commercially pure Ti sample using a focused ion beam. The Cantilevers were approximately 5 μm wide and 30 μm long. A nano-indenter was then used to conduct micro-bending tests. Slip systems are selectively activated in these α-Ti Beams by varying the crystal orientation along the beam. Increasing end deflections, from 1 to 8 μm, were applied to a series of similarly oriented Cantilevers to show the progressive development of deformation. Load drops associated with strain bursts were seen in the mechanical response of some of the plastically deforming Cantilevers. These appear to correlate with the formation of intense slip bands in the Cantilevers. A crystal plasticity-based finite element model was applied to simulate the bending behaviour of single-crystal Beams in the tested crystal orientations. Critical resolved shear stresses of 181 MPa for 〈 a 〉 on the prismatic, 474 MPa for 〈 c + a 〉 on the pyramidal and 209 MPa for 〈 a 〉 on the basal planes were determined via the reverse process of fitting the model load–displacement curves to experimental ones.
Michael I. Friswell - One of the best experts on this subject based on the ideXlab platform.
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Sensor shape design for piezoelectric Cantilever Beams to harvest vibration energy
Journal of Applied Physics, 2010Co-Authors: Michael I. Friswell, Sondipon AdhikariAbstract:Energy harvesting for the purpose of powering low power electronic sensor systems has received explosive attention in the last few years. A common device uses the piezoelectric effect for a Cantilever Beams at resonance to harvest ambient vibration energy. However most of these devices have a rectangular piezoelectric patch covering all or part of the beam. This paper considers the optimum design of such a device, and in particular investigates the effect that the size and shape of piezoelectric sensor has on the harvested energy. It is shown that significant increases in harvested energy may be obtained by optimising the sensor design.