• 제목/요약/키워드: Fiber Selection

검색결과 183건 처리시간 0.024초

자동차 시트 프레임의 경량화 설계에 관한 연구 (A Study on the Lightweight Design of a Seat Frame in Automotive Vehicles)

  • 최금호
    • 한국생산제조학회지
    • /
    • 제8권5호
    • /
    • pp.83-89
    • /
    • 1999
  • A seat frame structure in automotive vehicles made of polymer matrix composite to achieve weight reduction at low cost was developed. In order to design and manufacture the actual product studies on material selection and structural analysis were performed. Structural analysis was performed with a finite element method. The analysis was done for several cases suggested in various safety regulations. Each results was utilized to modify the actual shape to obtain a lighter, safer and more stable design. The final design was used to produce a sample bottom plate of the seat structure with reinforced by X-shape frame. Substitution of the material resulted in a weight reduction effect with equivalent strength fatigue and impact characteristics.

  • PDF

Development of analytical method for potential diesel oxygenate using SPME technique combinded with GC-FID

  • 이규현;이시진;장순웅
    • 한국지하수토양환경학회:학술대회논문집
    • /
    • 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
    • /
    • pp.354-357
    • /
    • 2004
  • The addition of oxygenates to diesel fuel can significantly reduce particulate emissions. Dibutyl maleate (DBM) and tripropylene glycol methyl ether (TGME) have been identified as possible additives based on their physicochemical characteristics and performance in engine test. However, their potential environmental impacts are unknown. therefore, practical considerations in the selection of an oxygenate additives should include cost, availability, compatibility with engines and fuel, and, particularly, its overall environmental impact. This study was investigated to determine optimal condition for the analysis of potential diesel oxygenates using SPME technique with GC-FID. Four fibers were compared and CAR/PDMS fiber was found to be the most sensitive when used direct-sampling. An absorption time of 30min and a desorption time of 5min provided to be the most sensitivity. The effects of experimental parameters such as the addition of salts, agitation, absorption time, compositon on the analysis were investigated. Analytical parameter such as linearity was also evaluated.

  • PDF

좌립형 폴리머 지지애자의 기계적 강도 해석 (Mechanical Strength Analysis of Station Type Po1ymer Insulator)

  • 조한구;박기호;한동희
    • 한국항해항만학회:학술대회논문집
    • /
    • 한국항해항만학회 2000년도 추계학술대회논문집
    • /
    • pp.85.1-88
    • /
    • 2000
  • FRP has been used very much as high strength core materials for insulators because of its high strength and good insulation properties. In this study cantilever, tension and torsion stress were simulation along to the unidirection glass fiber. In addition, FRP was made by pultrusion method. This paper proposed the procedure of the finite element model updating and pretest using the commerical finite element code MSC.Nastran. To ehance the efficiency of experimental modal analysis, we proposed the process which is the selection of the locations and the number of measurement points for pre-test.

  • PDF

고품질 양방항 서비스를 위한 HFC망 상향대역 신호분석에 관한 연구 (The Study on the Upsteam Signal Analysis of the HFC Access Network)

  • 장문종;현덕화;유인협
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2000년도 하계학술대회 논문집 A
    • /
    • pp.564-566
    • /
    • 2000
  • To provide more noiseless upstream service on the HFC(Hybrid-Fiber Coaxial) Access Network, we should conduct upstream band analysis and have related operation skill. In this paper, we studied the upstream signal measurement to get goof transmission quality, effective operation and maintenance, also showed the method of noise analysis and that of upstream band frequency selection. Finally we tested the signal in the field and showed the analyzed result.

  • PDF

복합구조물의 파괴에 관한 치수효과의 중요성 (The Importance of Size/Scale Effects in the Failure of Composite Structures)

  • 정영화;김경진;원치문;심도식
    • 산업기술연구
    • /
    • 제15권
    • /
    • pp.217-222
    • /
    • 1995
  • In this paper, the importance of the size effects on the strength ratio is demonstrated by numerical results. The rate of decrease of tensile strength is for glass fiber, based on the experience of a composite manufacturing specialist. For other material, similar procedure may be used until detailed test result on such material is available. The strength criteria used is that of Tsai-Wu for stress space. The factors influencing the ratio are, reducing the tensile strength alone or both tensile and compression strengths, selection of the normalized interaction term, that is, the generalized Von Mises criterion or the Hill's criterion, and the status of applied stresses. Some of the numerical results are presented for a guideline for the furture study.

  • PDF

수록화지와 한지의 열화적 특성에 관한 연구 -물리, 광학적 특성을 중심으로- (Characteristics of Degradation for the Hand-made Japanese Paper and Hand-made Korean Paper -Characteristics of Physical and Optical Test-)

  • 전철
    • 보존과학회지
    • /
    • 제5권1호
    • /
    • pp.11-19
    • /
    • 1996
  • This research carried out on characteristics of degradation for the handmade Japanese paper(Washi) and handmade Korean paper(Hanji), which are not studied clearly at present, made an experiment on the physical and the optical tests to the temperature and humidity, The results are as follows ;The handmade Korean paper showed worse results of physical and optical tests than those of Washi. Above all, that low durability was the most characteristics. The handmade paper demands preservation, and therefore, the fiber selection of compositive materials is important. For the handmade Korean paper showed this time, put waste pulps off, and adjust the mixing maintaining appropriate basis weight, and then it must be improved durability.

  • PDF

CAPA를 활용한 적용사례 및 개선대책 (Case studies using CAPA to eliminate problems)

  • 이영창;여동구;구본흥
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2002년도 금형가공 심포지엄
    • /
    • pp.95-102
    • /
    • 2002
  • With recent trends leaning towards product miniaturization, the advent of new material and speedy delivery times, old style conventional trial-and-error methods have been only serving to weaken corporate competitiveness. Reliant on tiny increments of time-consuming experience, this antiquated approach begets a delayed delivery of product development, cost loss and quality depreciation. To solve such problems, the Dedicated Injection Molding CAPA (Computer Aided Plastics Application) performs a preliminary examination on problems rising from every stage of creation - from appropriate material selection and mold design to mass production - through a computer system. Thus, it determines the optimum design variables and process conditions while diagnosing and solving defective molds.

  • PDF

백판지의 두께 증대를 위한 목질섬유의 이용 (1) - 목질섬유의 이용 - (Improvement of Thickness in White Duplex Board by Utilization of Defibrated Fibers (1) - Utilization of Defibrated Fibers -)

  • 서영범;김현준
    • 펄프종이기술
    • /
    • 제46권6호
    • /
    • pp.34-40
    • /
    • 2014
  • Wood fibers for medium density fiberboard (MDF) was used in the filler layer of the white duplex board for increasing thickness and bulk of the board. The MDF fibers and the old corrugated container (OCC) furnish were refined, and mixed together to form paperboard. At optimum mixing ratios and refining degrees, stiffness and tensile strength of the MDF fiber-containing board were higher than those of the board with 100% OCC. It was found that there was possibility to reduced basis weight of the filler layer down to 90% of the all OCC furnish by judicious selection of the mixing ratio and the refining method of the MDF fibers. Drainage rate increase and potential drying energy savings were additional benefits.

Advances in the Preparation of Soy Protein and Lecithin Ingredients for Tomorrow's Foods

  • Beery, Kenneth E.
    • 한국축산식품학회:학술대회논문집
    • /
    • 한국축산식품학회 2002년도 정기총회 및 제29차 춘계국제 학술발표대회
    • /
    • pp.29-38
    • /
    • 2002
  • Today's food technologist is receiving increasingly pointed directions in the “selection of”and often “minimum amounts of”ingredients to use in the development of new food products. This increasing emphasis by marketing on “label”claims is real and gaining momentum in most market places. Thus, the development of functional foods that are providing customers with new and distinct nutritional choices. The driving force for the increased direction of the food technologist is that many governments are now allowing health related label claims on food products. These health claims are a result of very clearly and focused research that shows known nutritional benefits. The regulatory environment is well focused on the results of this peer reviewed research. In the USA, FDA has allowed several opportunities for health claims including fiber, soy protein and choline. This presentation will focus on only two of many functional ingredient options-the soy proteins and lecithin(choline).

  • PDF

발.변전용 지지애자의 기계적 강도해석과 특성시험 (Mechanical Strength Analysis and Property Test of Post Insulator for Substation and Generation)

  • 박기호;조한구;한동희
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2001년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 연구회
    • /
    • pp.69-71
    • /
    • 2001
  • FRP has been used very much as high strength core materials for insulators because of its high strength and good insulation properties. In this study cantilever, tension and torsion stress were simulation along to the unidirection glass fiber. In addition, FRP was made by pultrusion method. This paper proposed the procedure of the finite element model updating and pretest using the commerical finite element code MSC.Nastran. To ehance the efficiency of experimental modal analysis. we proposed the process which is the selection of the locations and the number of measurement points for pre-test.

  • PDF