Modeling and Simulation of Monocrystal Piezoelectric Generator

2013 ◽  
Vol 785-786 ◽  
pp. 1203-1207
Author(s):  
Lei Zhang ◽  
Li Qing Fang ◽  
De Qing Guo ◽  
Yong Chao Chen
Keyword(s):  
Modeling And Simulation ◽  
Numerical Method ◽  
Analytical Model ◽  
Piezoelectric Materials ◽  
Mechanical Vibration ◽  
Adhesive Layer ◽  
Operation Mechanism ◽  
Material Parameters ◽  
Voltage Stress ◽  
Piezoelectric Generator

The expressions of voltage, stress and amount of charge of monocrystal piezoelectric generator under concentrated exterior pressure was derived in order to proving the precision and validity of numerical method applied to piezoelectric materials' distribution sensing and the study of operation mechanism ignore the influence of adhesive layer. An analytical model of the monocrystal piezoelectric generator was established by using the mechanical vibration theory. And the effects of the structural and material parameters on the output energy are analyzed.

scholarly journals Cheating at Craps

2021 ◽  
Vol 48 (4) ◽  
pp. 53-61
Author(s):  
Andrea Marin ◽  
Carey Williamson
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Modeling And Simulation ◽  
Analytical Model ◽  
Quantitative Evaluation ◽  
Mathematical Analysis ◽  
Simulation Modeling ◽  
Analytical Modeling ◽  
The World ◽  
Simulation Results

Craps is a simple dice game that is popular in casinos around the world. While the rules for Craps, and its mathematical analysis, are reasonably straightforward, this paper instead focuses on the best ways to cheat at Craps, by using loaded (biased) dice. We use both analytical modeling and simulation modeling to study this intriguing dice game. Our modeling results show that biasing a die away from the value 1 or towards the value 5 lead to the best (and least detectable) cheating strategies, and that modest bias on two loaded dice can increase the winning probability above 50%. Our Monte Carlo simulation results provide validation for our analytical model, and also facilitate the quantitative evaluation of other scenarios, such as heterogeneous or correlated dice.

scholarly journals Vibration-induced nanoscale friction modulation on piezoelectric materials

Friction ◽  
2022 ◽  
Author(s):  
Jiawei Cao ◽  
Qunyang Li
Keyword(s):  
Piezoelectric Materials ◽  
Effective Means ◽  
Mechanical Vibration ◽  
Friction Model ◽  
Friction Reduction ◽  
Small Scale ◽  
Vibrational Amplitude ◽  
Vibration Source ◽  
Reduction Effect ◽  
Piezoelectric Thin Film

AbstractMechanical vibration, as an alternative of application of solid/liquid lubricants, has been an effective means to modulate friction at the macroscale. Recently, atomic force microscopy (AFM) experiments and model simulations also suggest a similar vibration-induced friction reduction effect for nanoscale contact interfaces, although an additional external vibration source is typically needed to excite the system. Here, by introducing a piezoelectric thin film along the contact interface, we demonstrate that friction measured by a conductive AFM probe can be significantly reduced (more than 70%) when an alternating current (AC) voltage is applied. Such real-time friction modulation is achieved owing to the localized nanoscale vibration originating from the intrinsic inverse piezoelectric effect, and is applicable for various material combinations. Assisted by analysis with the Prandtl—Tomlinson (P—T) friction model, our experimental results suggest that there exists an approximately linear correlation between the vibrational amplitude and the relative factor for perturbation of sliding energy corrugation. This work offers a viable strategy for realizing active friction modulation for small-scale interfaces without the need of additional vibration source or global excitation that may adversely impact device functionalities.

A study on determination of tensile properties of metals at elevated temperatures from spherical indentation tests

2019 ◽  
Vol 54 (5-6) ◽  
pp. 331-347
Author(s):  
Tairui Zhang ◽  
Shang Wang ◽  
Weiqiang Wang
Keyword(s):  
Tensile Properties ◽  
Analytical Model ◽  
Elevated Temperatures ◽  
Regression Function ◽  
Maximum Error ◽  
Analytical Models ◽  
Uniaxial Tensile ◽  
Spherical Indentation ◽  
Material Parameters ◽  
Indentation Tests

In this study, spherical indentation tests were used to determine the uniaxial tensile properties of metals at elevated temperatures (200 °C, 400 °C, and 600 °C). Taking the difference between spherical indentation tests at room and elevated temperatures into consideration, the incremental and analytical models were used to determine material parameters ( σ0, Ep, and n) and thermal softening parameters ( Eeff and m) in the Johnson–Cook constitutive equation, respectively. A discussion on the stability of the analytical model proved that despite in relative complicated forms and with three intercoupling material parameters, the analytical model is still effective for tensile property calculation. From the investigation on the relationship between pm and pi, it was found that correlating coefficient ξ is actually a function of both indentation depth and material parameters, and thus, a regression function was proposed for a more accurate description of ξ. Effectiveness of the spherical indentation tests was verified through experiments on three steels, SA508, 15CrMoR, S30408, and one titanium alloy, TC21, which proved that the spherical indentation tests can provide both proof and tensile strength calculations with a maximum error around 15% at room temperature and within 20% at elevated temperatures, and thus satisfy the demands for engineering applications.

scholarly journals Micro Electromagnetic Actuator - Static Behavior

2018 ◽  
Vol 220 ◽  
pp. 05003 ◽  
Author(s):  
Constantin Daniel Comeaga ◽  
Dragos Ovezea ◽  
Cristinel Ilie
Keyword(s):  
Comparative Study ◽  
Modeling And Simulation ◽  
Optimum Design ◽  
Experimental Results ◽  
Classical Type ◽  
Electromagnetic Actuator ◽  
Static Behavior ◽  
Material Parameters ◽  
Good Linearity ◽  
Different Types

The article presents a comparative study regarding the design and experimental results for a miniature electromagnetic actuator with a modified design comparing with the classical type, including a mobile array of micro-magnets and a fixed coil in two configurations (planar spiral multi-layered and cylindrical). Previous work on design, modeling and simulation of this type of actuator indicated the optimum design and conducted to dimensions and material parameters. Different types of actuators were produced and experimentally tested, showing good results but also some drawbacks. Three of these design solutions are presented together with the static voltage-deflection and electrical impedances curves, experimentally derived. The results confirmed the feasibility of two actuating solution, showing good linearity and possibility to control the position at h accuracy and indicated improving directions.

Effect of temperature rise on characteristics of a standing wave ultrasonic motor

2019 ◽  
Vol 30 (6) ◽  
pp. 855-868 ◽  
Author(s):  
Qibao Lv ◽  
Zhiyuan Yao ◽  
Lifeng Zhou ◽  
Lingyong Pan
Keyword(s):  
Standing Wave ◽  
Temperature Rise ◽  
Piezoelectric Materials ◽  
Ultrasonic Motor ◽  
Effect Of Temperature ◽  
Material Parameters ◽  
Proposed Model ◽  
And Performance ◽  
Output Characteristics ◽  
Frequency Temperature

Heat loss occurs in the process of energy conversion, which causes the temperature rise and performance degradation of ultrasonic motor. In this article, a novel theoretical model is developed to investigate the temperature field and output characteristics of a standing wave ultrasonic motor. The roughness of contact surface and the interaction between temperature rise and material parameters of stator are taken into account in the proposed model. The frequency–temperature characteristics of stator are studied, and the changes in the dielectric coefficients of piezoelectric materials with respect to the temperature are determined by experimental data. The accuracy and effectiveness of the developed model are validated by correlative experiment. The results show that the developed model can not only predict the temperature variation of motor in continuous operation but also evaluate the influence of surface roughness and various input parameters on output characteristics of motor. These researches will give useful guidelines for optimizing heat source and enhancing reliability of motor.

Characterization of the passive and active material parameters of the pubovisceralis muscle using an inverse numerical method

2018 ◽  
Vol 71 ◽  
pp. 100-110 ◽  
Author(s):  
M.E.T. Silva ◽  
M.P.L. Parente ◽  
S. Brandão ◽  
T. Mascarenhas ◽  
R.M. Natal Jorge
Keyword(s):  
Numerical Method ◽  
Active Material ◽  
Material Parameters

Structural Design and Testing of a Butterfly Piezoelectric Generator with Multilayer Cantilever Beams

2013 ◽  
Vol 655-657 ◽  
pp. 823-829 ◽  
Author(s):  
Zhi Lin Ruan ◽  
Jun Jie Gong ◽  
Meng Chang Cai ◽  
Bing Huang
Keyword(s):  
Resonant Frequency ◽  
Cantilever Beam ◽  
Structural Design ◽  
Output Voltage ◽  
Experimental Setup ◽  
Cantilever Beams ◽  
Material Parameters ◽  
Piezoelectric Cantilever ◽  
Piezoelectric Generator ◽  
Design And Testing

In order to solve the inconsistent problem of multi-layer connection and vibration in each layer, a butterfly piezoelectric generator with multilayer cantilever beams is designed. The generator is mainly constituted by butterfly multilayer cantilever beams and mass subassembly two parts. Physical devices of butterfly generator and typical piezoelectric cantilever are fabricated respectively. The experimental setup is also put up for the testing of resonant frequency and output voltage. It can be found that each layer of multilayer generator has a similar output voltage and resonant frequency to the typical one with same geometric and material parameters. So each layer in butterfly piezoelectric generator can be simplified as a typical cantilever beam for researching and analyzing.

Analytical Model to Determine the Strength of Form-Fit Connection Joined by Die-Less Hydroforming

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Christian Weddeling ◽  
Soeren Gies ◽  
Nooman Ben Khalifa ◽  
A. Erman Tekkaya
Keyword(s):  
Analytical Model ◽  
Load Transfer ◽  
Dissimilar Materials ◽  
Experimental Investigations ◽  
Mean Deviation ◽  
Material Parameters ◽  
Load Transfer Mechanism ◽  
Fundamental Understanding ◽  
Increasing Demand ◽  
Tube Geometry

Modern lightweight concept structures are increasingly composed of several dissimilar materials. Due to the different material properties of the joining partners, conventional and widely used joining techniques often reach their technological limits when applied in the manufacturing of such multimaterial structures. This leads to an increasing demand for appropriate joining technologies, like joining by die-less hydroforming (DHF) for connecting tubular workpieces. The present work introduces an analytical model to determine the achievable strength of form-fit connections. This approach, taking into account the material parameters as well as the groove and tube geometry, is based on a membrane analysis assuming constant wall thicknesses. Besides a fundamental understanding of the load transfer mechanism, this analytic approach allows a reliable joining zone design. To validate the model, experimental investigations using aluminum specimens are performed. A mean deviation between the calculated and the measured joint strength of about 19% was found. This denotes a good suitability of the analytical approach for the design process of the joining zone.

CHARACTERIZATION OF MECHANICAL VIBRATION DAMPING BY PIEZOELECTRIC MATERIALS

1996 ◽  
Vol 197 (4) ◽  
pp. 489-513 ◽  
Author(s):  
H.H. Law ◽  
P.L. Rossiter ◽  
G.P. Simon ◽  
L.L. Koss
Keyword(s):  
Piezoelectric Materials ◽  
Mechanical Vibration ◽  
Vibration Damping
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