• Title/Summary/Keyword: Analytical Analysis

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Development of Analytical Models for Switched Reluctance Machine and their Validation

  • Jayapragash, R.;Chellamuthu, C.
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.990-1001
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    • 2015
  • This paper presents analysis of Switched Reluctance Machine (SRM) using Geometry Based Analytical Model (GBAM), Finite Element Analysis (FEA) and Fourier Series Model (FSM) with curve fitting technique. Further a Transient Analysis (TA) technique is proposed to corroborate the analysis. The main aim of this paper is to give in depth procedure in developing a Geometry Based Analytical Model of Switched Reluctance Machine which is very accurate and simple. The GBAM is developed for the specifications obtained from the manufacturer and magnetizing characteristic of the material used for the construction. Precise values of the parameters like Magneto Motive Force (MMF), flux linkage, inductance and torque are obtained for various rotor positions taking into account the Fringing Effect (FE). The FEA model is developed using MagNet7.1.1 for the same machine geometry used in GBAM and the results are compared with GBAM. Further another analytical model called Fourier Series Model is developed to justify the accuracy of the results obtained by the methods GBAM and FEA model. A prototype of microcontroller based SRM drive system is constructed for validating the analysis and the results are reported.

Development of Rotordynamic Analytical Model and Analysis of Vibration Response of a Turbocharger (터보차져의 로터다이나믹 해석모델 개발 및 진동응답 해석)

  • Kim, Byung-Ok;Lee, An-Sung
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.5
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    • pp.35-42
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    • 2010
  • This paper deals with the development of analytical model of a turbocharger and its detail rotordynamic analysis. Two analytical models, which are verified by experimental modal testing, are proposed and the analytical model including rotor shaft extended to compressor and turbine wheel end side is chosen. A rotordynamic analysis includes the critical map, Campbell diagram, stability, and unbalance response, especially nonlinear transient response considering nonlinear fluid film force at bearings. Although the linearized analysis accurately predicts the critical speeds, stability limit, and stability threshold speed, the predicted vibration results are not valid for speeds above the stability threshold speed since the rotor vibrates with a subsynchronous component much larger than the one synchronous with rotor speed. Hence, for operating speed above the stability threshold, a nonlinear transient analysis considering nonlinear fluid film force must be performed in order to accurately predict vibration responses of rotor and guarantee results of analysis.

Analysis on electromagnetic characteristics of linear induction motor using the analytical method (해석적인 방법에 의한 직선형 유도 전동기의 전자기적 특성해석)

  • Jang, Seok-Myeong;Choi, Ji-Hwan;Ko, Kyoung-Jin;Kim, Hyun-Kyu;Kim, Il-Jung
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.804_805
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    • 2009
  • This paper deals with analysis on electromagnetic characteristics of linear induction motor(LIM) using the analytical method. As a analytical method, space harmonics method which is applied to multilayer region is used in this paper. Using the flux density obtained by analytical method, thrust and normal force are calculated through Maxell stress tensor. The results such as flux densitty, eddy current and force are verified by comparison between analytical results and FEM.

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Isolation and Quantitative Determination Method Validation of myristicin from Myristica fragrans Houttuyn (육두구(Myristica fragrans Houttuyn) 내의 myristicin의 분리 및 HPLC를 이용한 함량분석 방법 밸리데이션)

  • Kim, Soo-Hwan;Lee, Dong-Ho;Kwon, Soo-Han;Lim, Buyng-Ho;Lee, Sang-Hun;Min, Bum-Chan
    • Korean Journal of Pharmacognosy
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    • v.38 no.1
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    • pp.19-21
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    • 2007
  • Myristica fragrans has been used for the treatment of stomachache in East Asia. It is very important to determine the amount of myristicin in Myristica fragrans, because excess myristicin causes side effects. In this study, we developed and validated the method for determination contents of myristicin in Myristica fragrans which was purchased from various regions of Korea. The average content of myristicin in Myristica fragrans was 2.10% with the validated HPLC analysis method.

Efficiency Optimal Design of a Brushless DC Motor Considering the Magnetization Direction of Permanent Magnet (영구자석의 착자방향을 고려한 브러시리스DC 전동기의 효율 최적화 설계)

  • Song, Jeong-Hyun;Kim, Byung-Taek
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.3
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    • pp.241-247
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    • 2011
  • This paper is intended to improve efficiency of two-phase BLDC motor using analytical and statistical methods, and then the stability of the starting for the designed model is investigated. The characteristics of the motor according to magnetization directions of permanent magnet are analyzed through the analytical method, and design variables that affect the efficiency are selected. Preliminary optimal design is performed using the analytical method with the design variable. The RSM (Response Surface Method) based on the FEA (Finite Element Analysis) is applied to complement errors of the analytical method. As a result, the optimal design is determined. Finally, the stability of the starting for the optimal designed model is evaluated by analyzing cogging torque, and it is verified through the FEA.

Characteristic Analysis of Axial-gap Motor using Magnetic Charge (Magnetic charge를 이용한 Axial-gap 전동기의 특성해석)

  • Lee, Sang-Ho;Kim, Do-Jin;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.997-998
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    • 2007
  • This paper deals with analytical solution concerning the image method using the magnetic charge instead of 3D FEA(finite element analysis) in the slotless single air-gap motor. The theory of analytical method and the design procedures are introduced. The reliability and validity of proposed analytical solution are verified through the comparison with the results of commercial 3D FE software. In addition, calculation time between proposed analytical solution and 3D FEA is compared. Finally, characteristics, such as Back-EMF and phase resistance, between calculated and experimental results are compared. From the verification with 3D FEA and experimental results, it is proved that presented analytical method provided very effective and precise results.

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Precise Analytical Solution for the Peak Gain of LLC Resonant Converters

  • Hong, Sung-Soo;Cho, Sang-Ho;Roh, Chung-Wook;Han, Sang-Kyoo
    • Journal of Power Electronics
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    • v.10 no.6
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    • pp.680-685
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    • 2010
  • Although LLC resonant converters have the advantages of a wide operation range and high efficiency, the lack of an analytical solution for the peak gain makes it difficult to optimize the resonant tank design, when considering not only the normal condition but also the holdup time requirement. In this paper, based on a mathematical analysis of a LLC resonant converter at the peak gain point, an analytical solution for the peak gain has been developed. By using the developed analytical solution, the peak gain with given resonant tank parameters can be obtained. To confirm the validity of the developed analytical solution, simulations and experimental results are compared.

A study on analytical methods for polycyclic aromatic hydrocarbons in foods (식품 중 다환방향족탄화수소 분석법 연구)

  • Kim, Yong-Yeon;Shin, Han-Seung
    • Food Science and Industry
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    • v.55 no.1
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    • pp.45-57
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    • 2022
  • This study was proceeded the analytical methods using various analytical instruments for polycyclic aromatic hydrocarbons (PAHs) in food products. Various analytical methods were developed to determine levels of PAHs including benzo[a]pyrene, benzo[a]anthracene, benzo[b]fluoranthene, and chrysene formed in various food products using gas chromatography-mass spectrometry (GC-MS), enzyme-linked immunosorbent assay (ELISA) and raman spectroscopy. Recently, the rapid on-site response for the detection of hazardous substances in food aims to develop an onsite rapid detection of a simplified technical analysis method to reduce the time and cost required for analysis of PAHs. Current PAHs detection methods have been reviewed along with new raman spectroscopy analytical method.

Characteristic Analysis of Slotless-type Permanent Magnet Synchronous Motor by using Analytical Method (해석적인 방법에 의한 슬롯리스형 영구자석 동기전동기의 특성해석)

  • 강규홍
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.720-725
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    • 2000
  • This paper persents the characteristic analysis method of slotless-type Permanent Magnet Synchronous Motor using the analytical method. The results of analysis are compered with FEM to verify the validity of the proposed method.

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Bond Analysis of Ribbed Reinforcing Bars

  • Park, Oan-Chul
    • KCI Concrete Journal
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    • v.13 no.2
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    • pp.19-25
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    • 2001
  • A simple expression to predict bond strength of reinforcing bars with rib deformation to the surrounding is derived for the case of splitting bond failure. Finite element analysis is used to model the confining behavior of concrete cover. The roles of the interfacial properties, specifically, the friction coefficient, cohesion, the relative rib area and the rib face angle are examined. Values of bond strength obtained using the analytical model are in good agreement with the bond test results from the previous studies. The analytical model provides insight into interfacial bond mechanisms and the effects of the key variables on the bond strength of deformed bars to concrete. Based on the comparison between the analytical results and the test results, the values of cohesion, coefficient of friction, and the effective rib face angle are proposed.

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