• 제목/요약/키워드: Fiber angle

검색결과 678건 처리시간 0.027초

가호기 건조 시스템에서 수치적 유동해석 (Numerical Analysis of the Flow in the Drying Chamber of a Sizing Machine)

  • 이진호;김수연
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 1996년도 추계 학술발표회
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    • pp.29-34
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    • 1996
  • In the present paper, the flow distribution in the hot air drying chamber of a sizing machine was numerically analyzed with respect to the geometries of the intake duct to obtain the more uniform flow distribution in the chamber. The result shows that the velocity distribution in the inlet of the chamber was significantly dependent on the the geometry of the intake duct. The degree of the non-uniformity in the chamber was reduced as the incident angle of the intake duct became to be smaller.

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Characterization of wavelength dependent birefringence inside the ring type liber cavity using the polarization dependence of laser Outputs

  • Kim, Ho-Young;Kang, Kwang-Yong;Kim, Kyoung-Hon
    • Journal of the Optical Society of Korea
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    • 제6권2호
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    • pp.37-43
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    • 2002
  • Using the polarization dependence of laser output powers, we measured the characteristics of the birefringence, such as the magnitude of phase retardation, the ellipticity, and the off axis angle to the fiber optical axis, inside the ring type fiber laser cavity.

GC 연삭숫돌을 이용한 탄소섬유 에폭시 복합재료의 평면 연삭특성에 관한 연구 (A Study on the Plain Grinding Characteristics of Carbon Fiber Epoxy Composite with the GC Grinding Wheel)

  • 한흥삼
    • 한국생산제조학회지
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    • 제9권4호
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    • pp.34-47
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    • 2000
  • Since carbon fiber epoxy composite materials have excellent properties for structures due to their high specific strength, high specific modulus, high damping and low thermal expansion, the hollow shafts made of carbon fiber epoxy composites have been widely used for power transmission shafts for motor vehicles , spindles of machine tools, motor base, bearing mount for tool up and manufacturing. The molded composite machine elements are not usually accurate enough for mechanical machine elements, which require turning drilling , cutting and grinding. The experiment are surface grinding wheel GC60 to the carbon fiber epoxy composite specimen with respect to staking angle [0]nT , [45]nT, [90]nT on the CNC grinding machine. In this paper, the surface grinding characteristics of composite plate, which are surveyed experimentally and analytically with respect to the grinding force, surface roughness and wheel loading according to the variable depth of cut, wheel velocity and table feed rate are investigated.

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ODDMAC를 이용한 항균성 및 발수성 동시 발현이 가능한 기능성 면섬유 (Antimicrobial and Water Repellency Effect of Functional Cotton Fiber with ODDMAC(octadecyl dimethyl(3-triethoxy silylpropyl) ammonium chloride))

  • 전혜지;이재웅
    • 한국염색가공학회지
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    • 제31권4호
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    • pp.276-287
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    • 2019
  • In this study, cotton fibers were coated with a different weight percentage of octadecyl dimethyl(3-triethoxy silylpropyl) ammonium chloride(ODDMAC) to improve antimicrobial and water repellent properties. First, the ODDMAC dissolved in ethanol to prepare a solution. Then the cotton fibers were immersed in the ODDMAC/ethanol solution for 10 minutes at ambient temperature and dried at 80℃ for 3 minutes followed by curing. The treated cotton fibers were characterized by scanning electron microscopy(SEM) and x-ray photoelectron spectroscopy(XPS). The treated cotton fibers revealed sufficient antimicrobial activity against Klebsiella pneumoniae(ATCC 4352) and Staphylococcus aureus(ATCCBAA-1707). The hydrophobic nature of the treated cotton fibers was characterized by contact angle measurement. The results showed that the cotton fibers treated with the ODDMAC showed excellent hydrophobic properties which improved to 121°.

단일모우드 광섬유의 Birefringence특성에 관한 연구 (A Study on the Birefringence Properties of Single Mode Optical Fiber)

  • 김은수;박한규
    • 한국통신학회논문지
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    • 제7권4호
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    • pp.161-166
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    • 1982
  • 本論文에서는 단일 모우드 광섬유의 고유 birefringence 및 twisting에 의한 birefringence 특성에 대해 理論的 分析과 實驗을 하였다. 分析過程에서 단일 모우드 광섬유는 선형 지연기로 모델링하였으며 측정결과 순수birefringence는 약 2.57 /m로 나타났다. 그리고 twisting에 의한 회전을 섭동이론에 의해 理論的으로 分析한 結果 회전각을 광섬유의 비틀림각에 선형적으로 변화되었으며 이러한 理論的結果는 實驗的結果와 거의 일치함이 分析되었다.

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구형렌즈를 사용한 초소형 광 스위치에서의 Simulation (The Simulation of Micro Optical Cross Connect Based On Ball Lens)

  • 이두원;김호성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 추계학술대회 논문집 학회본부 C
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    • pp.594-596
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    • 2000
  • The best simulation condition for the fiber collimator that uses ball lenses was investigated. This kind of fiber collimator can be used in a Micro-Optical-Cross-Connects(MOXC). MOXC is composed of collimating ball lenses, micro mirrors and single-mode fibers. In order to design a MOXC, it is very important to calculate beam path, beam radius, divergence angle that determines the insertion loss of the MOXC. Since the beam profile from the fiber facet is not exact Gaussian profile, it was found that the simulation condition in which beam waist exists on the fiber facet, ignoring Numerical Aperture(NA), gives best agreement with the experimental results. Beam radii were measured with conventional knife edge method.

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Performance Evaluation of A Tunable Dispersion Compensator based on Strain-Chirped Fiber Bragg Grating in a 40 Gb/s Transmission Link

  • Kim, Chul-Han;Bae, Jun-Key;Lee, Kwan-Il;Lee, Sang-Bae
    • Journal of the Optical Society of Korea
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    • 제12권4호
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    • pp.244-248
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    • 2008
  • We have evaluated the performance of strain-chirped fiber Bragg grating (FBG) based tunable dispersion compensator in a 40 Gb/s transmission link. In our proposed compensator, the value of dispersion could be changed from -353 ps/nm to -962 ps/nm by adjusting the rotation angle of the metal beam on which the FBG was mounted. In order to evaluate the effect of ripples in reflectivity and variations in passband of the FBG based dispersion compensator, transmission performance has been measured with our tunable dispersion compensator. Error-free transmission of a 40 Gb/s non-return-to-zero (NRZ) signal over conventional single-mode fiber (SMF) was achieved.

대기압 플라즈마 처리를 통한 PP 섬유의 친수화 (Hydrophilization of PP Fiber through Atmospheric Pressure Plasma Processing)

  • 조항성
    • 한국염색가공학회지
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    • 제33권3호
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    • pp.113-119
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    • 2021
  • Polypropylene fiber has the advantages of light weight, heat retention and antibacterial properties, but it is difficult to expand its market because it cannot be dyed or imparted functionality due to its hydrophobic properties. Atmospheric pressure plasma processing can modify the surface of the fiber and create polar functional groups on the surface of the fiber. In this study, an experiment was conducted on the hydrophilization of the ultra-hydrophobicity of polypropylene through plasma processing and surface changes before and after plasma processing. The ultra-hydrophobicity of polypropylene is the cause of impossible for dyeing and imparting functionality. Untreated polypropylene became hydrophilic, and it was confirmed that the ratio of oxygen and carbon(O/C) increased about 11 times from untreated polypropylene 0.017 to plasma-treated polypropylene 0.190.

다이아몬드 입자 전착드릴에 의한 탄소섬유 에폭시 복합재료의 드릴링 특성에 관한 연구 (A Study on the Drilling Characteristics of Carbon Fiber Epoxy Composite Materials by Diamond Grit Electroplated Drills)

  • 김형철;김기수;함승덕;김홍배;남궁석
    • 한국정밀공학회지
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    • 제12권8호
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    • pp.27-38
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    • 1995
  • For solving troubles happened during the drilling process with carbon fiber epoxy composite materials(CFRP) by using HSS drill, a few types of diamond gift electroplated drills are manufactured, and machinability of these drills is experimented with a variety of cutting speed and feed rate. These drills have some advantages of good wear resistant and the conception of grinding process. As a result, using of these drills improves both troubles being caused by tool wear and damage of exit surface depending on fiber stacking angle. It is desirable that cutting conditions for the cutting thickness per revolution must be set under 0.01mm when the size of a diamond grit is # 60 .approx. 80.

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인발성형 GFRP 부재의 특성 변화와 앵글 및 튜브 부재의 좌굴 거동 분석 (Characteristics of Pultruded GFRP and Buckling Behavior of Angle and Tubular Member)

  • 이성우;신경재;김현정
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2000년도 춘계학술발표대회 논문집
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    • pp.15-19
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    • 2000
  • Recently Western countries are now beginning to use ACM (Advanced Composites Material), in the construction industry Compared with existing construction materials, ACM possesses many advantages such as light-weight, high-strength, corrosion resistant property. Among other fabrication process of ACM, pultrusion is one of the promising one for civil infrastructure application. In this paper, the structural characteristics of pultruded GFRP strip and structural members of angle and tube type were studied. For the strip, parametric studies of pultrusion process has been carried out. Considered parameters were volume fraction, temperature, pulling speed and fiber orientations. For the pultruded angle and tube, compression test and buckling analysis has been carried out. The results were compared with calculated values using coded formulae

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