• 제목/요약/키워드: Metallic plate

검색결과 211건 처리시간 0.032초

금속 재질별 건성 마찰소음 실험적 특성 연구 (An Experimental Investigation of Dry Friction Noise for Several Metallic Materials)

  • 백종수;강재영
    • 대한기계학회논문집A
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    • 제39권7호
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    • pp.681-686
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    • 2015
  • 본 연구는 steel 재질의 판과 Cu, Ni, Al, Mg 재질의 핀 간에 발생하는 마찰에 의한 마찰소음 특성을 왕복운동 및 회전운동 실험장치를 통하여 연구하였다. 실험 결과 미끄럼 속도에 대한 마찰곡선의 음의 기울기가 소음발생시점에 영향을 주었다. 특히 Cu 가 소음발생시점과 음의 기울기 측면에서 마찰소음방지에 가장 우수한 재질임을 확인하였다.

A Numerically Efficient Full Wave Analysis of Circular Resonators Microbandes Stacked Involving Multimetallisations

  • Chebbara, F.;Fortaki, T.
    • Journal of Electrical Engineering and Technology
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    • 제10권1호
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    • pp.314-319
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    • 2015
  • The conventional geometry of a plate microstrip resonator is made up of a single metallic patch, which is printed on a monolayer dielectric substrate. Its arrangement is simple and easy to make, but it is limited in its functional abilities. Many searches have been realized to improve the bandwidth and the gain of the microstrip resonators. Among the various configurations proposed in the open literature, the stacked geometry seems to be very promising. By appropriate design, it is able to provide the operation in dual frequency mode, wide bandwidth enough and high gain. The theoretical investigations of structures composed of two stacked anti-reflection coatings, enhanced metallic coatings are available in the literature, however, for the stacked configurations involving three metallic coatings or more, not to exact or approximate analysis was conducted due to the complexity of the structure.

고성능 금속마찰재의 트라이볼로지적 특성 (Tribological Characteristics for High Perfomance Metallic Friction Materials)

  • 김석삼;김재호;안효준
    • Tribology and Lubricants
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    • 제14권1호
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    • pp.45-53
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    • 1998
  • Friction and wear test for two kinds of Cu-based sintered metallic friction material against cast iron disk was carried out by plate-on-disk type friction and wear tester to investigate the friction and wear characteristics of brake system in severe condition. In this experimental study, the counter specimen was cast iron which is being used generally in brakes of heavy duty equipments. Test friction materials were A type which was manufactured by foreign company and B type by domestic company. Friction coefficient and wear volume were measured and compared with each other. The experiment was performed under room temperature. The worn surface of cast iron disk and friction material were observed by scanning electron microscope. The temperature of surface of disk was measured continuously by the non-contacting thermometer. It was found that A type friction material had stable friction coefficient over the wide range of sliding condition, but B type friction material had unstable friction coefficient and lower value of 0.2 under the severe sliding condition.

등가 모델을 이용한 3점 굽힘 하중을 받는 딤플형 금속 샌드위치판재의 효율적 해석 (Efficient FE-Analysis Method with Equivalent Models for Metallic Sandwich Plates with Inner Dimpled Shell Subject to 3-Point Bending)

  • 성대용;정창균;윤석준;양동열
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2005년도 춘계학술대회 논문집
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    • pp.130-133
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    • 2005
  • Efficient finite element method has been introduced for metallic sandwich plates subject to 3-point bending. A full model 3-point bending FE-analysis shows that plastic behavior of inner structures appears only at the load point. So, Unit structures of sandwich plates are defined to numerically calculate the bending stiffness with recurrent boundary condition of pure bending. And then equivalent models with same bending stiffness and strength of full models are designed analytically. It is demonstrated that results of both models are almost same and FE analysis method with equivalent models can reduce analysis time effectively.

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트러스형 샌드위치 판재에서 기계적 물성이 내충격성에 미치는 영향 (Effects of Mechanical Properties on Crashworthiness in Sandwich Plate with a Truss Core)

  • 정창균;성대용;양동열;안동규
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2008년도 춘계학술대회 논문집
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    • pp.444-447
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    • 2008
  • A sandwich plate with a truss core is composed of two face sheets and a truss core between the face sheets. In this paper, a metallic sandwich plate with a pyramidal truss core is investigated numerically, for its deformation and energy absorption ability under dynamic loading. To find the effect of mechanical properties on crashworthiness in the sandwich plate with a pyramidal truss core, various pyramidal cores were simulated and investigated. It appears that relative density and shear modulus of a pyramidal truss core effect the change of energy absorption.

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성형 이력을 고려한 용융탄산염 연료전지용 쉴디드 슬롯 플레이트의 압축 및 굽힘 거동 분석 (Compressive and Bending Behaviors of the Shielded Slot Plate Considering Forming Effect for Fuel Cell Application)

  • 이창환;양동열;강동우;장인갑;이태원
    • 소성∙가공
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    • 제21권6호
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    • pp.341-347
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    • 2012
  • The metallic bipolar plates of the molten carbonate fuel cell(MCFC) are composed of shielded slot plates and a center-plate. The shielded slot plates support the center-plate and the membrane electrode assembly. Compressive forces are applied to the shielded slot plate in order to increase the contact area between shielded slot plates and the membrane electrode assembly (MEA). In the design of the shielded slot plate, it is necessary to predict the mechanical behavior of the shielded slot plate. The shielded slot plates are manufactured by a three-stage forming process consisting of slitting, preforming and the final forming process. The mechanical behavior of the shielded slot plate is largely affected by the forming process. In this study, the simulation of the three-stage forming process was used to predict the mechanical behavior of the shielded slot plate. The present simulation approach showed good agreements with the experimental results.

하인두 후벽암으로 오인된 경추 내고정 금속판 삽입 후 발생한 육아종 1예 (Granuloma Resulting from the Cervical Metallic Plate, Masquerading as Posterior Pharyngeal Wall Cancer)

  • 김승우;김영배;사대진
    • 대한두경부종양학회지
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    • 제27권2호
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    • pp.218-221
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    • 2011
  • The anterior approach to the cervical spine surgery is associated with possible complications such as dysphagia, hoarseness and granuloma formation etc. Because of orthopedic metallic plates, the increasing or focal uptake pattern may be demonstrated in $^{18}F$-FDG PET/CT scan. A 67-year-old-man came to our department, complained of dysphagia during the 4 months. He underwent cervical spine surgery three years ago. The CT and MRI findings mimicked typical posterior pharyngeal wall cancer with cervical metastasis. Furthermore, the SUV in $^{18}F$-FDG PET/CT was 10.3. But he was finally diagnosed as a granuloma resulting from the metallic cervical implants. The clinical correlation and medical history should be taken into account to avoid false-positive findings in PET/CT and to avoid many erroneous diagnostic pathways.

금속 몸체를 갖는 휴대단말기를 위한 MediaFLO/GPS/Bluethooth용 새시 모드 안테나의 설계 (Design of MediaFLO/GPS/Bluetooth Chassis Mode Antenna for Mobile Handset with Metallic Body)

  • 정강재;이병제
    • 한국전자파학회논문지
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    • 제20권9호
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    • pp.829-834
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    • 2009
  • 본 논문에서는 아래위로 7.6 mm의 간격을 갖고 있는 두 개의 금속판을 단락 핀으로 연결하고, 그 사이에 급전점을 위치시킴으로써 MediaFLO(Media Forward Link Only)/GPS(Global Positioning System)/Bluetooth 대역의 안테나 구현하였다. 안테나는 각각 사용 주파수 밴드별로 $0.5\;{\lambda}$ 슬롯 안테나와 단락된 패치 안테나의 배열로 해석이 가능하다. 제안된 안테나는 최근에 늘어나고 있는 금속 몸체를 갖는 이동 통신 단말기에서 별도의 안테나 없이, 단말기의 몸체를 안테나로 재활용할 수 있는 가능성을 제시하였다.

고분자전해질 연료전지용 바이폴라 플레이트의 표면형상과 전기적 특성 (Surface Morphology and Electrical Property of PEMFC (Proton Exchange Membrane Fuel Cell) Bipolar Plates)

  • 송연호;윤영훈
    • 한국세라믹학회지
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    • 제45권3호
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    • pp.161-166
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    • 2008
  • The multi-films of a metallic film and a transparent conducting oxide (TCO, indium-tin oxide, ITO) film were formed on the stainless steel 316 and 304 plates by a sputtering method and an E-beam method and then the external metallic region of the stainless steel bipolar plates was converted into the metal nitride films through an annealing process. The multi-film formed on the stainless steel bipolar plates showed the XRD patterns of the typical indium-tin oxide, the metallic phase and the metal substrate and the external nitride film. The XRD pattern of the thin film on the bipolar plates modified showed two metal nitride phases of CrN and $Cr_2N$ compound. Surface microstructural morphology of the multi-film deposited bipolar plates was observed by AFM and FE-SEM. The metal nitride film formed on the stainless steel bipolar plates represented a microstructural morphology of fine columnar grains with 10 nm diameter and 60nm length in FE-SEM images. The electrical resistivity of the stainless steel bipolar plates modified was evaluated.