An Investigation of the Dynamic Behavior of a Piezoceramic Vibrator Clamped With a Resonate Amplifier Using Equivalent Circuits

Vibration Measurement ◽

Equivalent Circuits ◽

Operating Voltage ◽

Dynamic Feature ◽

Dynamic Features ◽

Maximum Displacement

Using equivalent circuit analysis, the dynamic behavior of ultrasonic wave propagation in solid metals is investigated in this study, particularly in Langevin vibrators clamped with a resonant amplifier to enlarge the vibrating magnitude. For piezoelectric static feature, the piezoceramic impedance and equivalent circuits were obtained for the parameter model of the vibrator via the impedance analyzer. To analyze piezoceramic dynamic feature, the characteristic of motional current relative to frequency response was measured under practical operating voltage for the vibrator. Both static and dynamic features of a piezoceramic vibrator were compared to realize the difference and to build the dynamic equivalent circuit. The vibration measurement module of optical fiber was also employed to detect the maximum displacement of a vibrator with a resonant amplifier. The measured results demonstrate that the resonant frequency is moved to the lower frequency band. The new equivalent circuit model is proposed to further match the dynamic response and the stepped horn increases the vibrating amplitude by about seven times. This is the more efficient mechanical output for a vibrator.

Prediction and Analysis of Reinforcement Corrosion in Simulated Concrete Pore Solution Based on Neural Network

International Journal of Pattern Recognition and Artificial Intelligence ◽

10.1142/s0218001420590478 ◽

2020 ◽

Vol 34 (14) ◽

pp. 2059047

Author(s):

Fengjiao Jiang ◽

Jinxin Gong ◽

Jichao Zhu ◽

Huan Wang ◽

Weibo Song

Keyword(s):

Neural Network ◽

Equivalent Circuit ◽

Pore Solution ◽

Chloride Ion ◽

Ion Concentration ◽

Equivalent Circuits ◽

Chromium Alloy ◽

Ph Values ◽

Impedance Characteristics

The corrosion of reinforcement has always been a problem to be solved in the field of architecture. In this paper, the corrosion characteristics of chromium alloy steel under different pH conditions are studied. The impedance characteristics and equivalent circuit are predicted by neural network model. First of all, in simulated pore solution with different pH values, the characteristics of Nyquist impedance spectroscopy of the whole chromium alloy under passivation stage and the damaged passivation film of reinforcing bars under initial corrosion stage have been found. Then, according to the difference of impedance characteristics under different pH values, different equivalent circuits have been established and [Formula: see text] values of different equivalent circuits under different chloride ion concentration have been calculated. By fitting the electrochemical parameters of the equivalent circuit with [Formula: see text] values, the equivalent circuit model which can be predicted by neural network has good consistency with the equivalent circuit which can be predicted by [Formula: see text] values.

Application of an Equivalent Circuit Model for Ionic Polymer-Metal Composite (IPMC) Bending Actuator Loaded With Multiwalled Carbon Nanotube (M-CNT)

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.309-311.593 ◽

2006 ◽

Vol 309-311 ◽

pp. 593-596 ◽

Cited By ~ 4

Author(s):

Deuk Yong Lee ◽

Kwang Jin Kim ◽

Seok Heo ◽

Myung Hyun Lee ◽

Bae Yeon Kim

Keyword(s):

Elastic Modulus ◽

Carbon Nanotube ◽

Equivalent Circuit ◽

Electric Fields ◽

Electromechanical Coupling ◽

Metal Composite ◽

Multiwalled Carbon ◽

Bending Actuator

Biomimetic actuators that can produce soft-actuation but large force generation capability are of interest. NafionTM, an effective ionomeric material from DuPont, has been shown to produce large deformation under low electric fields (<10V/mm). In this effort, multi-walled carbon nanotube (M-CNT)/NafionTM nanocomposites were prepared by casting in order to investigate the effect of M-CNT loading in the range of 0 to 7 wt% on electromechanical properties of the MCNT/ NafionTM nanocomposites. The measured elastic modulus and actuation force of the MCNT/ NafionTM nanocomposites are drastically different, showing larger elastic modulus and improved electromechanical coupling, from the one without M-CNT. In this work, we attempted to incorporate an equivalent circuit analysis to address the effect of capacitance and resistance of such M-CNT/NafionTM nanocomposites that would differ from conventional IPMCs.

Evaluation of Annealing Effects on TiO2 Nanorod Arrays for Dye-Sensitized Solar Cells by Equivalent Circuit Analysis

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.609-610.152 ◽

2014 ◽

Vol 609-610 ◽

pp. 152-158 ◽

Cited By ~ 1

Author(s):

Mei Rong Sui ◽

Xiu Quan Gu

Keyword(s):

Solar Cells ◽

Equivalent Circuit ◽

Dye Sensitized Solar Cells ◽

Photocurrent Density ◽

Nanorod Arrays ◽

Shunt Resistance ◽

Dye Sensitized ◽

Sensitized Solar Cells

TiO2 nanorod arrays (NRA) were synthesized via a facile hydrothermal method for preparing the dye-sensitized solar cells (DSSC). It was found that a post-thermal treatment facilitated enhancing the cell efficiency. The cells containing NRs underwent 500 °C annealing exhibited much higher efficiency than those un-sintered ones. Further, the internal resistance analysis was carried out to reveal the mechanism underlying the DSSC performance improvement. Specifically, the equivalent circuit model was employed to derivate the internal resistances, which was consistent with the experimental results. It was found that the sintered cells exhibited a higher series resistance and a lower shunt resistance than the un-sintered ones, suggesting the higher photocurrent density might result from the larger amount of dye loading.

Nonintrusive Method for Induction Motor Equivalent Circuit Parameter Estimation using Chicken Swarm Optimization (CSO) Algorithm

Nigerian Journal of Technological Development ◽

10.4314/njtd.v18i1.4 ◽

2021 ◽

Vol 18 (1) ◽

pp. 21-29

Author(s):

M. Aminu ◽

M. Abana ◽

S.W. Pallam ◽

P.K. Ainah

Keyword(s):

Parameter Estimation ◽

Equivalent Circuit ◽

Induction Motor ◽

Estimation Method ◽

Test Method ◽

Equivalent Circuits ◽

Circuit Parameter ◽

Swarm Optimization ◽

Chicken Swarm Optimization

This paper presents a nonintrusive method for estimating the parameters of an Induction Motor (IM) without the need for the conventional no-load and locked rotor tests. The method is based on a relatively new swarm-based algorithm called the Chicken Swarm Optimization (CSO). Two different equivalent circuits implementations have been considered for the parameter estimation scheme (one with parallel and the other with series magnetization circuit). The proposed parameter estimation method was validated experimentally on a standard 7.5 kW induction motor and the results were compared to those obtained using the IEEE Std. 112 reduced voltage impedance test method 3. The proposed CSO optimization method gave accurate estimates of the IM equivalent circuit parameters with maximum absolute errors of 5.4618% and 0.9285% for the parallel and series equivalent circuits representations respectively when compared to the IEEE Std. 112 results. However, standard deviation results in terms of the magnetization branch parameters, suggest that the series equivalent circuit model gives more repeatable results when compared to the parallel equivalent circuit. Keywords: Induction motor, Chicken Swarm Optimization, parameter estimation, equivalent circuit, objective function

Evaluation of Fano resonance and phase analysis of plasma induced transparency in photonic nanostructure based on equivalent circuit analysis

Journal of Optics ◽

10.1088/2040-8986/ac4b88 ◽

2022 ◽

Author(s):

Yanming Feng ◽

Zhiguo Li ◽

Qiang Zhao ◽

P P Chen ◽

Jiqing Wang

Keyword(s):

Equivalent Circuit ◽

Fano Resonance ◽

Strong Coupling Regime ◽

Plasmonic Nanostructures ◽

Coupling Constant ◽

Lc Circuit ◽

Induced Transparency ◽

Insight Into

Abstract Fano resonance and plasma induced transparency (PIT) have been widely observed in various plasmonic nanostructures. Fano resonance takes place in weak coupling regime where coupling constant between two electromagnetic modes is lower than damping constant of system. Hence, extracting coupling and damping coefficients from resonance spectrum is the key to distinguish between Fano resonance and other resonances. In this paper, we propose a simple and realizable coupled LC circuit to analyze Fano resonance and PIT. Weak and strong coupling regime are distinguished by comparing coupling constant with damping constant. Meanwhile, we gain deep insight into Fano resonance and PIT in circuit by analyzing circuit phase and understand their connection with resonance in photonic structure. Furthermore, we extend the equivalent circuit model to the field involved short-range plasmon polarization or multi-orders dark modes. Since there are no specific parameters associated with photonic nanostructure, the proposed equivalent circuit can be used in most plasmonic resonance system as an universal model.

Embedded Simple Excited Automotive Alternator Modeling using Magnetic Equivalent Circuits

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v7i3.pp1145-1153 ◽

2017 ◽

Vol 7 (3) ◽

pp. 1145

Author(s):

Moufida Klach ◽

Helmi Aloui ◽

Rafik Neji ◽

Mohamed Gabsi ◽

Michel Lecrivain

Keyword(s):

Numerical Method ◽

Equivalent Circuit ◽

Circuit Model ◽

Saturation Effect ◽

Equivalent Circuits ◽

Resistive Load ◽

Dc Excitation ◽

Automotive Alternator ◽

Excitation Winding

This paper presents the modeling by Magnetic Equivalent Circuit model (MEC) of a Simple Excited Automotive Alternator (SE2A) where DC-excitation winding is transferred from rotor side to statorone rather than in conventional automotive claw pole alternators, to overcome the disadvantages of the ring-brush system. Following the resolution of the MEC using Newthon-Raphson numerical method, the alternator performances at both no-load and under resistive load regimes is achieved considering the saturation effect. It has been found that alternator’s performances carried out using the proposed MEC are with closed proximity to experimental records on a built prototype of the considered alternator.

A Research and Analysis on Equivalent Circuit Model of Lead-Acid Batteries of Armored Vehicles

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.654.119 ◽

2014 ◽

Vol 654 ◽

pp. 119-123

Author(s):

Kuang Cheng Li ◽

Yan Liu ◽

Zheng Liu ◽

Huai Bin Yang

Keyword(s):

Equivalent Circuit ◽

Circuit Model ◽

The State ◽

Equivalent Circuits ◽

Lead Acid Battery ◽

Lead Acid Batteries ◽

Armored Vehicles ◽

Equivalent Circuit Models ◽

Lead Acid

To analyze the operation of the lead-acid battery of armored vehicles and facilitate the measurement of the state parameters, we need to see the lead-acid battery as a plurality of ideal components and establish the corresponding equivalent circuit model and characterize it. This paper describes several equivalent circuit models of commonly used lead-acid batteries, on this basis, we give the equivalent circuit model of lead-acid batteries of armored vehicles, and to analyze the variables of equivalent circuits.

EQUIVALENT CIRCUIT MODEL OF Ca1-xYxTi1-xCoxO3 USING IMPEDANCE SPECTROSCOPY

Modern Physics Letters B ◽

10.1142/s0217984903005238 ◽

2003 ◽

Vol 17 (08) ◽

pp. 339-346 ◽

Cited By ~ 3

Author(s):

RAJESH KUMAR KATARE ◽

LAKSHMAN PANDEY ◽

O. P. THAKUR ◽

OM PARKASH ◽

DEVENDRA KUMAR

Keyword(s):

Electrical Properties ◽

Impedance Spectroscopy ◽

Equivalent Circuit ◽

Circuit Model ◽

Equivalent Circuits ◽

Electronic Ceramics

Computer simulated complex immittance spectra of model equivalent circuits involving resistive and capacitive elements are calculated. A comparison of experimentally obtained complex immittance plots of the system Ca 1-x Y x Ti 1-x Co x O 3(x=0.05) with these simulated diagrams greatly facilitates the search for the most appropriate equivalent circuit representing the electrical properties of electronic ceramics.