scholarly journals Theoretical Modeling of Piezoelectric Cantilever MEMS Loudspeakers

2021 ◽  
Vol 11 (14) ◽  
pp. 6323
Author(s):  
Wei Liu ◽  
Jie Huang ◽  
Yong Shen ◽  
Jiazheng Cheng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Equivalent Circuit ◽  
Sound Pressure ◽  
Low Cost ◽  
The Finite Element Method ◽  
Microelectromechanical System ◽  
Piezoelectric Cantilever ◽  
Equivalent Circuit Method ◽  
Electromechanical Conversion

Piezoelectric microelectromechanical system (MEMS) loudspeakers have received extensive attention in recent years. In particular, the piezoelectric cantilever MEMS loudspeaker, which uses multilayer piezoelectric cantilever actuators (MPCAs), has attracted attention because of its small size, low cost, ease of manufacture, and desirable piston movement. However, owing to the complex driving principles of MPCAs, no adequately efficient and appropriate method currently exists that can be used to analyze and predict the performance of piezoelectric cantilever MEMS loudspeakers. In this study, the equivalent circuit method (ECM) is adopted to theoretically model piezoelectric cantilever MEMS loudspeakers, and an ECM model with a special MPCA transformer for electromechanical conversion is proposed. With the proposed ECM model, the performance characteristics of piezoelectric cantilever MEMS loudspeakers, such as the displacement and sound pressure response, can be calculated efficiently and conveniently. To verify the accuracy of the ECM model, the finite element method is adopted for simulation, and the simulated results are compared with those of the ECM models. A satisfactory agreement was found, which verifies the accuracy of the proposed ECM model.

scholarly journals Analysis Study of Hybrid Magnetic Equivalent Circuit of IPMSM

2021 ◽  
Author(s):  
In-Soo Song ◽  
Byoung-Wook Jo ◽  
Ki-Chan Kim
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Equivalent Circuit ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Magnetic Equivalent Circuit ◽  
Interior Permanent Magnet ◽  
Equivalent Circuit Method ◽  
Element Method

Recently, the demand for electric vehicle is increasing worldwide due to eco-friendly policies and stricter emission regulations. As a traction motor for electric vehicle, interior permanent magnet synchronous motors are mainly used. For the design of the interior permanent magnet synchronous motor, the magnetic equivalent circuit method, which is a method of lumped constant circuit, and the finite element method, which is a method of distributed constant circuit, mainly are used. Magnetic equivalent circuit method is useful for simple design through fast and intuitive parameters, but it cannot derive the distribution of magnetic field. The finite element method can derive an accurate magnetic field distribution, but it takes a long time to analyze and it is difficult to analyze intuitive design parameters. In this paper, magnetic equivalent circuit method and Carter coefficient are mixed for rotor structure design. This design method will be called the hybrid magnetic equivalent circuit method. Intuitive design parameters are derived through this hybrid magnetic equivalent circuit method. We will derive the Air gap flux density distribution according to rotor shape, no-load induced voltage, and cogging torque, and compare and verify it with the finite element method.

scholarly journals Analysis of an IPMSM Hybrid Magnetic Equivalent Circuit

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5011
Author(s):  
In-Soo Song ◽  
Byoung-Wook Jo ◽  
Ki-Chan Kim
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Equivalent Circuit ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Magnetic Equivalent Circuit ◽  
Equivalent Circuit Method ◽  
Intuitive Design ◽  
Element Method

The most common type of electric vehicle traction motor is the interior permanent magnet synchronous motor (IPMSM). For IPMSM designs, engineers make use of the magnetic equivalent circuit method, which is a lumped constant circuit method, and the finite element method, which is a distributed constant circuit method. The magnetic equivalent circuit method is useful for simple design through fast and intuitive parameters, but it cannot derive the distribution of the magnetic field. The finite element method can derive an accurate magnetic field distribution, but it takes a long time and is difficult to use for analysis of intuitive design parameters. In this study, the magnetic equivalent circuit method and Carter’s coefficient were combined for rotor structure design and accurate identification and analysis of circuit constants. In this paper, this design method is called the hybrid magnetic equivalent circuit method. Intuitive design parameters are derived through this hybrid magnetic equivalent circuit method. The air gap flux density distribution according to rotor shape, no-load-induced voltage, and cogging torque was analyzed and compared to results of the finite element method. The proposed method was found to achieve a short solving time and acceptably accurate results.

Analysis for Vehicle Interior Noise Using Helmholtz Resonator

2005 ◽  
Author(s):  
Wakae Kozukue ◽  
Ichiro Hagiwara ◽  
Yasuhiro Mohri
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Resonance Frequency ◽  
Sound Pressure ◽  
Helmholtz Resonator ◽  
The Finite Element Method ◽  
Vehicle Interior ◽  
Vehicle Cabin ◽  
Set Up ◽  
Element Method

In this paper the reduction analysis of the so-called ‘booming noise’, which occurs due to the resonance of a vehicle cabin, is tried to carry out by using the finite element method. For the reduction method a Helmholtz resonator, which is well known in the field of acoustics, is attached to a vehicle cabin. The resonance frequency of a Helmholtz resonator can be varied by adjusting the length of its throat. The simply shaped Helmholtz resonator is set up to the back of the cabin according to the resonance frequency of the cabin and the frequency response of the sound pressure at a driver’s ear position is calculated by using the finite element method. It is confirmed that the acoustical characteristics of the cabin is changed largely by attaching the resonator and the sound quality is quite varied. The resonance frequency of the resonator can be considered to follow the acoustical characteristics of the cabin by using an Origami structure as a throat. So, in the future the analysis by using an Origami structure Helmholtz resonator should be performed.

An Overview of the Finite Element Method on the Tool-Soil Interacting Problem of Tillage

2014 ◽  
Vol 707 ◽  
pp. 397-400 ◽  
Author(s):  
Xiao Hong Liu ◽  
Yan Yu ◽  
Li Chun Qiu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Aided Design ◽  
High Efficiency ◽  
Low Cost ◽  
Dynamic Effect ◽  
Research Progress ◽  
The Finite Element Method ◽  
Displacement Fields ◽  
Element Method

This article introduced the up-to-date research progress on the tool-soil interacting problem of tillage; and investigated the situation of constitutive relation usage in the finite element method (FEM). A review including the dynamic effect on the performance of tillage operation with FEM has been conducted. It showed that the virtual reality method with FEM had made much progress in evaluating the tool draft, distribution position of stress and strain, displacement fields and acceleration in soil-tool interactions, soft ware package of computer aided design of tillage tools; it will be a low cost and high efficiency assistive tool in the development procedure of tillage tools, and can be applied to study and analyze the performance of resulting prototypes.

scholarly journals Multimodeling of multi-alterated structures in the Arlequin framework

2008 ◽  
pp. 969-980
Author(s):  
Hachmi Ben Dhia ◽  
Nadia Elkhodja ◽  
François-Xavier Roux
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Simple Structure ◽  
Low Cost ◽  
Numerical Results ◽  
Complex Structures ◽  
The Finite Element Method ◽  
Low Costs ◽  
Element Method

The goal of this work is the development of a numerical methodology for flexible and low-cost computation and/or design of complex structures that might have been obtained by a multialteration of a sound simple structure. The multimodel Arlequin framework is herein used to meet the flexibility and low-costs requirements. A preconditioned FETI-like solver is adapted to the solution of the discrete mixed Arlequin problems obtained by using the Finite Element Method. Enlightening numerical results are given.

scholarly journals Clarification of electrical current importance in plasma gene transfection by equivalent circuit analysis

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245654
Author(s):  
Yugo Kido ◽  
Hideki Motomura ◽  
Yoshihisa Ikeda ◽  
Susumu Satoh ◽  
Masafumi Jinno
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Spatial Distribution ◽  
Network Analysis ◽  
Equivalent Circuit ◽  
Gene Transfection ◽  
Electrical Current ◽  
Electrical Network ◽  
The Finite Element Method ◽  
Buffer Solution

We have been developing a method of plasma gene transfection that uses microdischarge plasma (MDP) and is highly efficient, minimally invasive, and safe. Using this technique, electrical factors (such as the electrical current and electric field created through processing discharge plasma) and the chemical factors of active species and other substances focusing on radicals are supplied to the cells and then collectively work to introduce nucleic acids in the cell. In this paper, we focus on the electrical factors to identify whether the electric field or electrical current is the major factor acting on the cells. More specifically, we built a spatial distribution model that uses an electrical network to represent the buffer solution and cells separately, as a substitute for the previously reported uniform medium model (based on the finite element method), calculated the voltage and electrical current acting on cells, and examined their intensity. Although equivalent circuit models of single cells are widely used, this study was a novel attempt to build a model wherein adherent cells distributed in two dimensions were represented as a group of equivalent cell circuits and analyzed as an electrical network that included a buffer solution and a 96-well plate. Using this model, we could demonstrate the feasibility of applying equivalent circuit network analysis to calculate electrical factors using fewer components than those required for the finite element method, with regard to electrical processing systems targeting organisms. The results obtained through this equivalent circuit network analysis revealed for the first time that the distribution of voltage and current applied to a cellular membrane matched the spatial distribution of experimentally determined gene transfection efficiency and that the electrical current is the major factor contributing to introduction.

scholarly journals A Modified Dynamic Model of Single-Sided Linear Induction Motors Considering Longitudinal and Transversal Effects

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 933
Author(s):  
Hamidreza Heidari ◽  
Anton Rassõlkin ◽  
Arash Razzaghi ◽  
Toomas Vaimann ◽  
Ants Kallaste ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Field Analysis ◽  
The Finite Element Method ◽  
End Effect ◽  
Linear Induction ◽  
Proposed Model

This paper proposes a modified dynamic equivalent circuit model for a linear induction motor considering both longitudinal end effect and transverse edge effect. The dynamic end effect (speed-dependent end effect) is based on conventional Duncan’s approach. The transverse edge effect is investigated by using three correction factors applied to the secondary resistance and magnetizing inductance. Moreover, the iron saturation effect, the skin effect, and the air-gap leakage effect are incorporated into the proposed model by using the field-analysis method. A new topology of the steady-state and space-vector model of linear induction, regarding all mentioned phenomena, is presented. The parameters of this model are calculated using both field analysis and the finite-element method. The steady-state performance of the model is first validated using the finite-element method. Additionally, the dynamic performance of the proposed model is studied. The results prove that the proposed equivalent circuit model can precisely predict the dynamic and steady-state performances of the linear induction.

scholarly journals Mechanical design of a low-cost ABS hand prosthesis using the finite element method

2021 ◽  
Vol 1736 ◽  
pp. 012039
Author(s):  
A Bastarrechea ◽  
Q Estrada ◽  
J Zubrzycki ◽  
V Torres-Argüelles ◽  
E Reynoso ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Design ◽  
Low Cost ◽  
The Finite Element Method ◽  
Hand Prosthesis ◽  
Element Method
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