scholarly journals Electrothermal Modeling and Analysis of Gallium Oxide Power Switching Devices

2019 ◽  
Author(s):  
Ramchandra M. Kotecha ◽  
Andriy Zakutayev ◽  
Wyatt K. Metzger ◽  
Paul Paret ◽  
Gilberto Moreno ◽  
...  
Keyword(s):  
Finite Element ◽  
Power Electronics ◽  
Gallium Oxide ◽  
Short Circuit ◽  
Thermal Characteristics ◽  
Wide Band ◽  
Element Model ◽  
Oxide Semiconductor ◽  
Modeling And Analysis ◽  
Device Architecture

Abstract Gallium oxide is an emerging wide band-gap material that has the potential to penetrate the power electronics market in the near future. In this paper, a finite-element gallium oxide semiconductor model is presented that can predict the electrical and thermal characteristics of the device. The finite element model of the two-dimensional device architecture is developed inside the Sentaurus environment. A vertical FinFET device architecture is employed to assess the device’s behavior and its static and dynamic characteristics. Enhancement-mode device operation is realized with this type of device architecture without the need for any selective area doping. The dynamic thermal behavior of the device is characterized through its short-circuit behavior. Based on the device static and dynamic behavior, it is envisioned that reliable vertical transistors can be fabricated for the power electronics applications.

Investigation on the shaft voltage generation of large synchronous turboalternators

2020 ◽  
Vol 39 (5) ◽  
pp. 1145-1156
Author(s):  
Kevin Darques ◽  
Abdelmounaïm Tounzi ◽  
Yvonnick Le-menach ◽  
Karim Beddek
Keyword(s):  
Finite Element ◽  
Design Methodology ◽  
Short Circuit ◽  
Element Model ◽  
Stator Winding ◽  
Content Type ◽  
Voltage Generation ◽  
The Impact ◽  
Investigation Process ◽  
Circulating Currents

Purpose This paper aims to go deeper on the analysis of the shaft voltage of large turbogenerators. The main interest of this study is the investigation process developed. Design/methodology/approach The analysis of the shaft voltage because of several defects is based on a two-dimensional (2D) finite element modeling. This 2D finite element model is used to determine the shaft voltage because of eccentricities or rotor short-circuit. Findings Dynamic eccentricities and rotor short circuit do not have an inherent impact on the shaft voltage. Circulating currents in the stator winding because of defects impact the shaft voltage. Originality/value The original value of this paper is the investigation process developed. This study proposes to quantify the impact of a smooth stator and then to explore the contribution of the real stator winding on the shaft voltage.

New Hammerstein Modeling and Analysis for Controlling Melt Pool Width in Powder Bed Fusion Additive Manufacturing

2021 ◽  
pp. 1-7
Author(s):  
Dan Wang ◽  
Xinyu Zhao ◽  
Xu Chen
Keyword(s):  
Finite Element ◽  
Additive Manufacturing ◽  
Process Variations ◽  
Element Model ◽  
Hammerstein Model ◽  
Powder Bed Fusion ◽  
Modeling And Analysis ◽  
Powder Bed ◽  
Melt Pool ◽  
Linearized Model

Abstract Despite the advantages and emerging applications, broader adoption of powder bed fusion (PBF) additive manufacturing is challenged by insufficient reliability and in-process variations. Finite element modeling and control-oriented modeling have been identified fundamental for predicting and engineering part qualities in PBF. This paper first builds a finite element model (FEM) of the thermal fields to look into the convoluted thermal interactions during the PBF process. Using the FEM data, we identify a novel surrogate system model from the laser power to the melt pool width. Linking a linearized model with a memoryless nonlinear submodel, we develop a physics-based Hammerstein model that captures the complex spatiotemporal thermomechanical dynamics. We verify the accuracy of the Hammerstein model using the FEM and prove that the linearized model is only a representation of the Hammerstein model around the equilibrium point. Along the way, we conduct the stability and robustness analyses and formalize the Hammerstein model to facilitate the subsequent control designs.

Automotive Glass Exciter Technology for Acoustic Application

2014 ◽  
Author(s):  
Babak Ebrahimi ◽  
Amir Khajepour ◽  
Todd Deaville
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Experimental Studies ◽  
Element Model ◽  
Fe Model ◽  
Component Level ◽  
Modeling And Analysis ◽  
Electric Actuator ◽  
Conventional Systems ◽  
Fine Tune

This paper discusses the modeling and analysis of a novel audio subwoofer system for automotive applications using the automobile windshield glass. The use of a piezo-electric actuator coupled with a mechanical amplifier linked to a large glass panel provides a highly efficient method of producing sound. The proposed subwoofer system has the advantage over existing conventional systems of not only reducing the weight of the automobile, but also a significant power savings resulting in an increase of expected fuel economy. Among various design challenges, the glass-sealing design is of huge importance, as it affects the system dynamic response and so the output sound characteristics. The main goal in this manuscript is to evaluate different glass-sealing design configurations by providing a comprehensive Finite Element model of the system. To do so, a comprehensive, yet simplified FE model is developed, and experimental studies are performed in the component level to fine-tune and verify the model. Harmonic response of the system for each sealing configuration design is obtained in the frequency range of 0–200 Hz, and the results are compared and discussed. The finite element model is also beneficial in preliminary design of other components as well as the exciter placement, and predicting the performance of the overall system.

Dynamic Modeling and Analysis of Guideway Joint of Engraving Machine

2011 ◽  
Vol 121-126 ◽  
pp. 3248-3252 ◽  
Author(s):  
Xiao Li Jin ◽  
Bao Ji Ma ◽  
Tao Feng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Prediction ◽  
Element Model ◽  
Contact Element ◽  
Modeling And Analysis ◽  
Fundamental Parameters ◽  
Joint Characteristics ◽  
Actual Force ◽  
Theory Research

Combined the theory research with the actual force and deformation of the guideway joint, the isoparametric eight-node contact element is proposed, the element reflects the joint characteristics of guideway of engraving machine. A finite element model of guidway joint is build. The fundamental parameters of the contact element are deduced by finite element method, which can apply with the performance prediction of the whole engraving machine in the process of design.

Inflight Deicing of Self-Actuating Aircraft Wing Structures With Piezoelectric Actuators

2002 ◽  
Author(s):  
Y. J. Lin ◽  
Suresh V. Venna
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Laminated Composite ◽  
Piezoelectric Actuators ◽  
Element Model ◽  
Harmonic Excitation ◽  
Dynamic Responses ◽  
Underlying Structure ◽  
Shear Stresses ◽  
Modeling And Analysis

Self-actuating aircraft wings for in-flight deicing with minimal power requirements are proposed. Lightweight piezoelectric actuators are utilized to excite the wing structure to its natural frequencies to induce shear stresses on the surface of the wing. The shears are generated in such a way that they are sufficient to break the weak bond between the ice layer and the wing surface. A laminated composite cantilever plate is used for the modeling and analysis. Analytical model is developed to predict the natural frequencies and shear stresses on the surface of the plate and finite element modal analysis is carried out to verify the results. In addition, finite element model involving the ice deposited on the underlying structure is built. The dynamic responses of the structure to harmonic excitation to its first five natural frequencies are investigated. It is observed that significant amount of ice de-bonding from the substrate occurs in the third mode, or the second symmetric mode. Moreover, the energy requirements of the piezoelectric actuators to actuate an adaptive composite structure with given weight are evaluated.

Finite Element Modeling and Analysis of Rolling Bearing Based on Explicit Dynamics

2013 ◽  
Vol 397-400 ◽  
pp. 589-592 ◽  
Author(s):  
Jing Cui ◽  
Hua Qing Wang ◽  
Fei Xiao ◽  
Zuo Yi Dong
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Rolling Bearing ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
Body Contact ◽  
Explicit Dynamics ◽  
Deep Groove ◽  
Rolling Elements ◽  
Multi Body

A finite element model of a rolling bearing with ANSYS/LS-DYNA is bulit , considering pressure, speed, multi-body contact effects and constraints under friction. The movement process of the rolling bearing based on explicit dynamics is simulated successfully. Several relevant parameters of 6205 deep groove ball bearing are calculated and determined. The results show that rotational speeds of cage and rolling elements which get from finite element analysis are consistent with the theoretical calculated values and stress situations are the same as Hertz analysis solutions. It proves that the proposed model is effective, which lays a foundation for subsequent analysis and diagnosis for defected bearings.

scholarly journals Co-Simulation Analysis for Performance Prediction of Synchronous Reluctance Drives

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2154
Author(s):  
Vasyl Varvolik ◽  
Dmytro Prystupa ◽  
Giampaolo Buticchi ◽  
Sergei Peresada ◽  
Michael Galea ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Simulation Model ◽  
Power Electronics ◽  
Simulation Analysis ◽  
Element Model ◽  
Good Correspondence ◽  
Electric Drives ◽  
Reluctance Machine ◽  
Drive Control

To improve the design of electric drives and to better predict the system performance, numerical simulation has been widely employed. Whereas in the majority of the approaches, the machines and the power electronics are designed and simulated separately, to improve the fidelity, a co-simulation should be performed. This paper presents a complete coupled co-simulation model of synchronous reluctance machine (SynRel) drive, which includes the finite element model of the SynRel, the power electronics inverter, the control system, and application examples. The model of SynRel is based on a finite element model (FEM) using Simcenter MagNet. The power electronics inverter is built using PLECS Blockset, and the drive control model is built in Simulink environment, which allows for coupling between MagNet and PLECS. The proposed simulation model provides high accuracy thanks to the complete FEA-based model fed by actual inverter voltage. The comparison of the simulation results with experimental measurements shows good correspondence.

scholarly journals Horizontal Backward Launch Dynamics Modeling and Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Liangyu Zhao ◽  
Yi Jiang ◽  
Xinlin Wei ◽  
Liqi Ma ◽  
Xiang Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Vital Role ◽  
Separation Process ◽  
Dynamics Modeling ◽  
Modeling And Analysis ◽  
Major Disadvantage ◽  
Modern Warfare ◽  
The Finite Element Model

Fighters’ air strikes play a vital role in modern warfare. But, with the development of fighters, the amount of bombs will inevitably become a major disadvantage due to the limitations of the invisible design and other functions, so a combination of the old model bombers and the advanced fifth-generation fighters has been proposed. This paper takes the aircraft missile horizontal backward launch system as the research object; firstly, the finite element model of the missile’s off-track is established, and the simulation calculation under the fixed platform is tested to verify the correctness of the finite element model. Meanwhile, the simulation parameters of the initial trajectory are obtained. Then, by establishing the separation model of the machine under the open state of the aircraft’s rear launcher, the variation of the flow field during the separation process of the missile is analyzed, and the variation of the force and the attitude of the missile is studied. It is found that the pitching motion of the missile is greatly affected by the initial pitch angle, it is always in the heading state during the whole separation process, and the yaw motion is not obvious.

Improvement of a Reduced Torsional Model by Means of Parameter Identification

1989 ◽  
Vol 111 (1) ◽  
pp. 17-26 ◽  
Author(s):  
P. Schwibinger ◽  
R. Nordmann
Keyword(s):  
Finite Element ◽  
Mechanical Model ◽  
Degrees Of Freedom ◽  
Short Circuit ◽  
Original System ◽  
Element Model ◽  
The Finite Element Method ◽  
System A ◽  
Reduction Methods ◽  
Short Circuits

Turbogenerator sets in operation may be excited to transient torsional vibrations by dynamic electrical moments at the generator due to short-circuits or faulty synchronization. For the solution of the torsional vibration problem it is essential to find an appropriate torsional model of the original system. A common approach is to model the torsional system finely by the finite element method which normally results in a very accurate mechanical model with many degrees of freedom (DOF). However for some applications it is desirable to have a torsional model with a reduced number of DOF which reproduces the original system exactly only in the lower eigenfrequencies and modes. This paper describes a method which allows finding a most accurate reduced torsional model with discrete masses and springs from a finite element model with many DOF. The results for the eigenfrequencies, the modes, and internal moments due to a short-circuit excitation of a 600 MW turbogenerator set are presented. They are compared with other reduction methods.

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