• Title, Summary, Keyword: Perpendicular Arrangement

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Design and Analysis of Permanent Magnet Double-Sided Linear Synchronous Motor with Perpendicular Arrangement (수직배열형 양측식 영구자석 선형 동기전동기의 설계 및 해석)

  • Kim, Chang-Eob;Lee, Seong-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.9
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    • pp.62-73
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    • 2013
  • In this paper, a new linear synchronous motor - permanent magnet double-sided synchronous motor with perpendicular arrangement (PMDLSM), was proposed. It was designed to account for the drawbacks of conventional linear motors, such as the normal force and end effects. The detent force and the thrust were analyzed for different combinations of primary core modules and magnet poles of the machine, and the optimum combination was made. The characteristics of the perpendicular PMDLSM were analyzed by finite element method, and the experiments agreed well with the analysis.

The Convective Heat Transfer for the Flow Perpendicular to the Tube Array (튜브배열 방향과 수직한 유동에 의한 관외 대류 열전달)

  • Jeon Yong-Han;Kim Jong-Yoon;Kim Nam-Jin;Kim Chong-Bo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.8
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    • pp.656-663
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    • 2006
  • The convective heat transfer on the outer surface of tube arrays perpendicular to the flow direction was experimentally investigated. The test sections which include the aligned and staggered arrangements were made and the local heat transfer coefficients on the outer surface of the tube were measured after the flow has been fully developed. The results showed that the local heat transfer coefficients of the staggered arrangement, which has transverse pitch of 0.075 m and longitudinal pitch of 0.08 m, were about 15% greater than that of the aligned arrangement. Also, the overall mean Nusselt number of the former was greater than that of the latter. It is verified that the results obtained by using the simulation show the same tendency with those of experiment.

Comparison of Reciprocal and Concentric Winding Arrangement of HTS Transformer (고온초전도 변압기의 교호 배치 권선과 동심형 배치 권선의 비교)

  • Kim, Sung-Hoon;Kim, Woo-Seok;Lee, Sang-Jin;Park, Kyeong-Dal;Joo, Hyeong-Gil;Hong, Gye-Won;Han, Jin-Ho;Hahn, Song-yop;Park, Chan-Bae
    • Progress in Superconductivity
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    • v.5 no.1
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    • pp.61-64
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    • 2003
  • In HTS transformer with double pancake windings, the perpendicular component of leakage magnetic flux density ($B_{r}$ ) applied to HTS tapes of double pancake windings of HTS transformer acts as a cause to decrease the critical current in HTS tape. So, in this paper, HTS transformer with reciprocal arrangement winding is designed. And in order to investigate the$ B_{r}$ applied to HTS windings, the 2-D non-linear electromagnetic analysis of HTS transformer is performed by using the OPERA 2D. The maximum $B_{r}$ applied to winding of HTS transformer is 0.112 T and the characteristics of HTS transformer were also obtained. But in this type of winding arrangement, reciprocal arrangement, the generated ac-loss to the HTS windings is very high because of the applied $B_{r}$ to HTS windings. Therefore, in order to reduce the generated ac-loss to the HTS windings, the new design of HTS transformer with concentric winding arrangement is presented in this paper and the 2-D non-linear electromagnetic analysis and the ac-loss for HTS transformer with the concentric winding arrangement is also carried out.

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A STUDY OF VON-MISES YIELD STRENGTH AFTER MANDIBULAR SAGITTAL SPLIT RAMUS OSTEOTOMY (하악지시상분할골절단술 시행 후 von-Miese 항복강도에 대한 유한요소법적 연구)

  • Yoon, Ok-Byung;Kim, Yeo-Gab
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.28 no.3
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    • pp.196-204
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    • 2002
  • For the study of its stability when the screw has been fixed after sagittal split ramus osteotomy(SSRO) of the mandible, the methods of screw arrangement are classified into two types, triangular and straight. The angles of screws to the bone surface are classified as perpendicular arrangements, the $60^{\circ}$ anterioinferior screw, known as triangular, and the most posterior screw, called straight arrangement, thus there are four types. The finite element method model has been made by using a three dimensional calculator and a supercomputer. The load directions are to the anterior teeth, premolar region, and molar region, and the bite force is 1 Kgf to each region. The distribution of stress, the von-Mises yield strength, and safety of margin refer to the total sum of transformed energy have been studied by comparison with each other. The following conclusion has been researched : 1. When shear stress is compared, in the triangular arrangement in the form of "ㄱ", the anterosuperior screw is seen at contributing to the support of the bone fragment. In the straight arrangement, substantial stress is seen to be concentrated on the most posterior angled screw. 2. When the von-Mises yield strength is compared, it seemed that the stress concentration on the angled anteroinferior screw is higher, it shows a higher possibility of fracture than any other screw. In the straight arrangement, stress appeared to be concentrated on the most posteriorly angled screw. 3. When the safety margins of the transfomed energy are compared, the energy conduction is much greater in the case of the angled screw than in the case of the perpendicular screw. The triangular arrangement in the form of "ㄱ" shows a superior clinical sign to that of the straight arrangement. Judging from the above results, when the screw fixation is made after SSRO in practical clinical cases, two screws should be inserted in the superior border of mandibular ramus and a third screw of mandibular inferior border should be inserted in the form of triangular. All screws on the bony surface should be placed perpendicularly-$90^{\circ}$ angles apparently best promote bony support and stability.

Mutual Inductance Calculation and Analysis between Two Circular Coils of Perpendicular Arrangement (수직 배열된 원형 코일 사이의 상호 인덕턴스 계산 및 해석)

  • Kim, Jin-Wook;Son, Hyeon-Chang;Kim, Do-Hyeon;Kim, Kwan-Ho;Park, Young-Jin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.10
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    • pp.999-1004
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    • 2011
  • In this paper, calculation method of mutual inductance for two circular coils which are widely used in wireless power transfer system and analysis results using the method are proposed. Two circular coils are arranged in a perpendicular way. For calculation of the mutual inductance, an Rx coil placed perpendicularly with the other coil is uniformly subdivided into many unit cells and both magnetic flux density linked with the Rx coil at each unit cell and the total magnetic flux density of the Rx coil are obtained. Two circular coils are considered as a filamentary coil and uniform current density on each coil is assumed. For verification, helical and spiral coils are fabricated. As a result of measurement in 50 cm to 100 cm distance, theoretical mutual inductance is almost agreed with measured one.

A Study on the Performance of a Cross-Flow Beat Exchanger by Tube Array Change (튜브배열 변화에 따른 직교류형 열교환기의 성능에 관한 연구)

  • Jeon Yong-Han;Kim Nam-Jin;Kim Chong-Bo
    • Journal of Energy Engineering
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    • v.15 no.1
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    • pp.28-34
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    • 2006
  • The convective heat transfer on the outer surface of tube arrays perpendicular to the flow direction was experimentally investigated. The test sections which include the aligned and staggered arrangements were made and the local heat transfer coefficients on the outer surface of the tube were measured after the Hour has been fully developed. The results showed that the local heat transfer coefficients of the staggered arrangement, which has transverse pitch of 0.075 m and longitudinal pitch of 0.08 m, were about 15% greater than that of the aligned arrangement. Also, the overall mom Nusselt number of the former was greater thu that of the latter.

A Survey on the Show Window Display of the Clothing Store [II] (의류 매장 종류에 따른 쇼윈도우 디스플레이에 관한 조사 연구)

  • 이연순
    • Journal of the Korean Home Economics Association
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    • v.31 no.2
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    • pp.205-212
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    • 1993
  • In order to research the display of the apparel store, 164 women's clothing in Taegu were investigated, from September 1. to October 31.1991. The result was as follows; 1. The perpendicular style of the show window glasses is widely used regardless of the store types. 2. The show window story is most frequently found at street-level in Taegu brand stores, but there are a few multi-storied show windows in National bland stores. 3. The open style background is used in a great part of Taegu brands, but the semi-open style is widely used in most National blands. 4. The arrangement of simular colors is used in a great parts of National brands, but the arrangement of different colors is used in many Taegu brands. 5. The base light and spot light is used at a high rate regardless of the stores, but the mannequin is more often used in National brands and Taegu brands.

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An Evaluation Scheme of Torsional Irregularity for Seismic Design of Hanok (한옥의 내진설계를 위한 비틀림비정형 평가 방안)

  • Kim, Yeong-Min
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.10
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    • pp.191-198
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    • 2019
  • In this paper the evaluation scheme for determining torsional irregularity of Hanok has been proposed. The proposed method can evaluate torsional irregularity of Hanok easily only with characteristics of Hanok shapes, arrangement of lateral load resisting frames and their lateral stiffness without time consuming and complicate 3-dimensional structural analysis. The proposed formula is expressed as allowable maximum eccentricity, and torsional irregularity is evaluated by comparing this value with actual eccentricity. The applicability of the proposed scheme was evaluated by applying it to the line shape plan Hanok with two symmetrically arranged walls and the result was expressed by formula and graph. The results showed that the allowable maximum eccentricity is 10% of plan dimension perpendicular to the seismic load when the walls are placed at the extreme end. The proposed formula was expressed as a generalized formula so it can be applied generally to the various plan shape and wall arrangement of Hanok.

A Histochemical Study of the periodontal Ligament Fibers in Trauma from Occlusion (실험적 외상성교합시 치근막섬유의 조직화학적 관찰)

  • Kim, Woo-Sung
    • The Journal of Korean Academy of Prosthodontics
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    • v.9 no.1
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    • pp.29-34
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    • 1969
  • Occlusal force is a critical factor affecting the condition and structure of the periodontium. When the occlusal forces exceed the physiologic adaptive capacity of the tissues, tissue damage ensues. Such damage is referred to as trauma from occlusion. Excessive pressure causes compression, degeneration and realignment of the periodontal ligament fibers so that they are paralleled perpendicular to the tooth and bone. By inducing excessive occlusal forces with a high amalgam filling on rat's molar, the author observed histologic alterations of the periodontal ligament fibers by means of Hematoxylin-eosin, Van Gieson and Aldenyde fuchsin stainings. The results of the study were observed as follows: 1) The excessive occlusal forces altered arrangement of the collagenous fibers. 2) The arrangement of the oblique fibers showed appreciable differences between the control group and the group subjected to 10 days experimental trauma from occlusion. 3) The realignment of the transseptal fibers was not found. 4) The arrangement of the oblique fibers after 15 days of trauma from occusion was similar to that of 10 days experimental group. 5) The oxytalan fibers were more abundant at the cementum rather than at the alveolar bone. 6) The excessive occlusal forces produced funnel-shaped widening of the oxytalan fibers, which followed wavy course. 7) The oxytalan fibers appeared to be distributed mainly around the middle third of the root rather than that of the apical third of the root during the experimental trauma from occlusion.

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Measurement and Analysis of Ground Impedance according to Arrangement of Auxiliary Probe around Ground Grid (접지 그리드에서의 보조전극 배치에 따른 접지임피던스 측정 및 분석)

  • Gil, Hyoung-Jun;Shong, Kil-Mok;Kim, Young-Seok;Kim, Chong-Min
    • Journal of the Korean Society of Safety
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    • v.30 no.4
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    • pp.46-50
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    • 2015
  • This paper describes the measurement and analysis of ground impedance according to arrangement of auxiliary probe around ground grid using the fall-of-potential method and the testing techniques to minimize the measuring errors are proposed. The fall-of-potential method involves passing a current between a ground electrode and a current probe, and then measuring the voltage between a ground electrode and a potential probe. To minimize interelectrode influences due to mutual resistances, the current probe is a generally placed at a substantial distance from the ground electrode under test. In order to analyze the effects of ground impedance due to the arrangement of auxiliary probe and frequency, ground impedances were measured in case that the arrangements of auxiliary probe were straight line, perpendicular line, and horizontal line. The distance of current probe was located from 10[m] to 200[m] and the measuring frequency was ranged from 55[Hz] to 513[Hz]. As a consequence, the ground impedance increases with increasing the distance from the ground electrode to the point to be tested, but the ground impedance decreases with increasing the frequency.