Design of a New Compliant Mechanical Amplifier

Ouyang, P. R.; Zhang, W. J.; Gupta, Meenakshi

doi:10.1115/detc2005-84371

Cited by 24 publications

(14 citation statements)

References 19 publications

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“…In this paper, we present an analytical model for the symmetric five-bar displacement amplification compliant mechanism used in [ 14 , 15 , 27 ], shown in Figure 1 . This mechanism is composed of links, corner-filleted flexure joints, and right-circular flexure joints, and is advantaged for its ability to provide high amplification ratios.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a Symmetric Five-Bar Displacement Amplification Compliant Mechanism for Energy Harvesting

Elsisy

Arafa

Saleh

et al. 2021

Sensors

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This paper presents an analytical model to determine a closed form mathematical representation for the output displacement of a displacement amplification compliant mechanism used for energy harvesting. A symmetric five-bar compliant mechanism with right-circular and corner-filleted flexure hinges was mathematically modeled and its displacement was determined using the Castigliano energy theorem. The stresses within the flexure joints, the weakest points in the mechanism body, were calculated. The mathematical model expresses both the displacement amplification and the stresses as functions of the design parameters and the load caused by the harvester. The developed model can be used to optimize the mechanism dimensions for maximum harvested power, while minimizing its structural stresses. The mechanism was also modeled numerically using finite element methods; both the analytical and numerical models were verified experimentally. The mathematical model of the mechanism was integrated with a model representing a piezoelectric energy harvester to calculate the open-circuit voltage. As a proof of concept, experiments were performed using an unimorph piezoelectric cantilever at low-frequency (less than 1 Hz) harmonic excitation inputs. The measured open-circuit voltage was found to be in agreement with that calculated using the proposed model, when integrated with the model representing the piezoelectric beam. The power generated by the piezoelectric harvester, equipped with the proposed displacement amplification mechanism, was more than a hundred times that without amplification.

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Section: Introductionmentioning

confidence: 99%

Modeling of a Symmetric Five-Bar Displacement Amplification Compliant Mechanism for Energy Harvesting

Elsisy

Arafa

Saleh

et al. 2021

Sensors

View full text Add to dashboard Cite

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“…The first category is to use mechanical displacement amplifiers [6]- [8], in which lever displacement amplifier has been widely employed because of its simplest mechanism structure; however, the conventional lever mechanism cannot fully meet the practical requirements, which arises from the contradiction between the displacement amplification ratio and the mechanism dimension. The second category is to select large-stroke actuators.…”

Section: Introductionmentioning

confidence: 99%

“…1 PZT amplifier,2 The controller of the laser displacement sensor, 3 BNC connector, 4 Vibration isolation stage,5 The developed flexible nanomanipulator,6 Camera system, 7 Microscopy system,8 Laser displacement sensor,9 Host controlling computer, 10 Vibration isolation table.…”

mentioning

confidence: 99%

A New Flexure-Based <inline-formula><tex-math notation="LaTeX">$Y\theta$</tex-math></inline-formula> Nanomanipulator With Nanometer-Scale Resolution and Millimeter-Scale Workspace

Tang

2015

IEEE/ASME Trans. Mechatron.

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In this paper, the development of a flexure-based twodegree-of-freedom (2-DOF) nanomanipulator with modified differential lever displacement amplifier is conducted, which aims to break through the millimeter-range barrier. The kinetostatics modeling of the mechanism is established by using the pseudorigid body method, also the analytical modeling of lever is built up, as well as the dimension optimizations and the mechanism performance validations are conducted by using the Particle Swarm Optimization algorithm and the finite-element analysis method, respectively. With the consideration of hysteresis effect inherent in piezoelectric ceramics actuators, the hysteresis modeling is conducted by using the Preisach theory. To enhance the mechanism positioning performance, a novel feedforward nonlinear proportionintegration-differentiation control strategy composed by the nonlinear PID controller and the inverted Preisach hysteresis compensator is proposed in this paper. Finally, a series of closed-loop motion tracking experiments have been carried out. It indicates that the developed mechanism has achieved a millimeter workspace (3.1273 mm × 26.5 • ), nanometer scale motion resolution (40 nm), as well as a closed-loop positioning bandwidth of over 10 Hz.Index Terms-Feedforward nonlinear PID (FNPID), hysteresis compensator, lever displacement amplifier, nanomanipulator, pseudorigid body.

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“…Most of the applications utilize one piezocantilever as the displacement actuator while the second one as the force actuator in order to ensure the precise positioning by controlling the manipulation force [18], [19]. The design of piezoelectric cantilevered structures devoted to micro/nano positioning, microassembly and micromanipulation applications has been addressed in the past [20]- [23]. These works proposed methodologies to design optimized compliant mechanisms with piezoelectric actuation in order to obtain maximized displacement.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Piezoelectric Cantilevered Actuators With Guaranteed Performances by Using Interval Techniques

2014

IEEE/ASME Trans. Mechatron.

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Piezoelectric materials are well recognized for the development of systems and actuators working at the micro/nanoscale such as microsystems. This recognition is thanks to the high resolution, high bandwidth and high force density that they can offer. However, piezoelectric actuators are typified by low range of displacement relative to other actuators like magnetic or thermal actuators. To obtain sufficient range of displacement with a piezoelectric actuator, either we use high input voltages or we redesign the actuator to have larger dimensions. The former solution may lead to the destruction of the actuators and the latter is not congruent with the objectives of microsystems where the dimensions should be miniaturized. Furthermore, increasing the dimensions of the actuators reduces their rapidity and bandwidth. This paper proposes an approach based on interval analysis to design piezoelectric actuators with cantilever structures. The aim consists in reducing their dimensions while still satisfying some specified performances in term of output range and in term of resonant frequency (and thus bandwidth). The problem of the design is formulated as a set-inversion problem which can be solved using interval techniques. The obtained results, validated with prototype fabrication and experimental characterization, demonstrate the efficiency and the interests of the proposed method for designing systems and actuators working at the micro/nano-scale in general. Index Terms-Piezoelectric actuators, Design and development, Interval analysis, Bounded parameters, Set-inversion problem, Guaranteed and optimal design, micro and nano-scale. The first author was with the Automatic Control and Micro-Mechatronic Systems Department (AS2M) during this work. The second and third authors are with the Automatic Control and Micro-Mechatronic Systems Department (AS2M).

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Design of a New Compliant Mechanical Amplifier

Cited by 24 publications

References 19 publications

Modeling of a Symmetric Five-Bar Displacement Amplification Compliant Mechanism for Energy Harvesting

Modeling of a Symmetric Five-Bar Displacement Amplification Compliant Mechanism for Energy Harvesting

A New Flexure-Based <inline-formula><tex-math notation="LaTeX">$Y\theta$</tex-math></inline-formula> Nanomanipulator With Nanometer-Scale Resolution and Millimeter-Scale Workspace

Optimal Design of Piezoelectric Cantilevered Actuators With Guaranteed Performances by Using Interval Techniques

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