• 제목/요약/키워드: Minimization of normal force

검색결과 6건 처리시간 0.021초

Halbach 배열 영구자석형 Planar Motor의 수직력 최소화 (Normal Force Minimization of the Synchronous Permanent Magnet Planar Motor with Halbach Magnet Array)

  • 김덕현;김규탁
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권11호
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    • pp.582-588
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    • 2006
  • This paper presents the characteristics analysis and normal force minimization of a synchronous permanent magnet planar motor(SPMPM) with Halbach magnet way. Firstly, the flux density distribution is calculated by analytical method; then, the characteristics of this SPMPM are evaluated, some experiments have been done to verify the analysis propriety and to investigate the interaction among the characteristics; At last, the normal force is minimized by using genetic algorithm and it is decreased from 672.83[N] to 144.24[N] remarkably.

새배열 영구자석형 Planar Motor의 수직력 최소화 (Normal Force Minimization in the SPMPM with New Permanent Magnet Array)

  • 주건배;황예;장기봉;김규탁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.993-994
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    • 2007
  • This paper presents the normal force minimization design and the analysis of normal force effect which acts on the characteristics of the Synchronous Permanent Magnet Planar Motor (SPMPM) with new array. The experiments are applied to verify the analytical analysis. There is no doubt that the significant reduction of normal force and the experimental values dovetail nicely with the simulation.

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Halbach 배열 영구자석형 Planar Motor의 수직적 해석 및 영향 (A study of normal force and its effect in a SPMPM with Halbach array)

  • 황예;주건배;한광규;김규탁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.86-88
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    • 2006
  • This paper presents normal force analysis and its minimization of synchronous permanent magnet planar motor(SPMPM) with Halbach array. Firstly, the experimental error of thrust is investigated and it is caused by the friction force generated by normal force. Then normal force Is analyzed by Maxwell stress tensor. At last, the normal force is minimized by using genetic algorithm and it is decreased from 672.83[N] to 144.24[N] remarkably.

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Nonlinear section model for analysis of RC circular tower structures weakened by openings

  • Lechman, Marek;Stachurski, Andrzej
    • Structural Engineering and Mechanics
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    • 제20권2호
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    • pp.161-172
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    • 2005
  • This paper presents the section model for analysis of RC circular tower structures based on nonlinear material laws. The governing equations for normal strains due to the bending moment and the normal force are derived in the case when openings are located symmetrically in respect to the bending direction. In this approach the additional reinforcement at openings is also taken into account. The mathematical model is expressed in the form of a set of nonlinear equations which are solved by means of the minimization of the sums of the second powers of the residuals. For minimization the BFGS quasi-Newton and/or Hooke-Jeeves local minimizers suitably modified are applied to take into account the box constraints on variables. The model is verified on the set of data encountered in engineering practice. The numerical examples illustrate the effects of the loading eccentricity and size of the opening on the strains and stresses in concrete and steel in the cross-sections under consideration. Calculated results indicate that the additional reinforcement at the openings increases the resistance capacity of the section by several percent.

입체 반송용 선형유도전동기의 설계 변수 최적화에 대하여 (On the optimization of the design variables of linear induction motor for 3-D conveyor system)

  • 임달호;김규탁;박승찬
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1991년도 하계학술대회 논문집
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    • pp.139-142
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    • 1991
  • The design variables of SLIM used for 3-D conveyor system are optimized by nonlinear programing. Five design variables are selected as independent ones and object function is expressed as a combination of the weight and the normal force of the motor. Maximum flux density in the teeth, primary length and starting thrust are chosen as constraint functions. Goodness factor considering of conveying characteristic is also included in the constraints. In this paper sequential unconstrained minimization technique(SUMT) and variable metric method are used to solve the nonlinear problem.

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판형 부품의 밀링 가공에 의한 변형 최소화에 대한 연구 (A study on the minimization of deformation by milling of plate-shaped parts)

  • 이민구;윤재웅
    • Design & Manufacturing
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    • 제15권3호
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    • pp.32-38
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    • 2021
  • Plate-shaped works are one of the materials that can be applied to the entire industry due to their various shapes and sizes. Plate-shaped parts workpieces are thin and wide, and when processing is completed, they are often bent or deformed in various directions, making it difficult to produce normal products. In particular, this study intends to study the processing deformation and distortion of plate-shaped parts fastened to the jig during milling processing. In this study, a method for preventing deformation occurring in plate-shaped parts was derived through jig element change and CAE analysis, and this was applied to actual processing to produce products with stable dimensions. Through a finite element analysis experiment, it was found that installing two supports on the back of the plate-shaped part results in minimal deformation and the optimal distance between the two supports is 150 mm. Through this experiment, when processing a thin plate product, a support was installed in a direction opposite to the cutting force applied to the thin plate to prevent deformation of the product, thereby improving defects.