• 제목/요약/키워드: optimal processing condition

검색결과 273건 처리시간 0.021초

신경망이론을 이용한 어인자의 수준사이를 고려한 최적조건 선정에 관한 연구 (Selecting the Optimum Process Condition Between the Factor Level Using Neural Network)

  • 홍정의
    • 품질경영학회지
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    • 제30권2호
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    • pp.86-98
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    • 2002
  • Defining the relationship between the quality of injection molded parts and the process condition is very complicate because of lots of factor are involved and each factor has a non-linearity. With the development of CAE(Computer Aided Engineering) technology, the estimation of volumetric shrinkage of injection mold parts is possible by computer simulation even though restricted application. In this research, Neural Network applied for finding optimal processing condition. The percent of volumetric shrinkage compared on each case and show neural network can be successfully applied selecting optimum condition not only within factor level but also between factor level.

펨토초 레이저를 이용한 OLED 용 Shadow Mask Invar 합금의 어블레이션 (Femtosecond Pulsed Laser Ablation of OLED Shadow Mask Invar Alloy)

  • 정일영;강경호;김재도;손익부;노영철;이종민
    • 한국정밀공학회지
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    • 제24권12호
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    • pp.50-56
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    • 2007
  • Femtosecond laser ablation of the Invar alloy and hole drilling for a shadow mask are studied. We used a regenerative amplified Ti-sapphire laser with a 1kHz repetition rate, 184fs pulse duration and 785nm wavelength. Femtosecond laser pulse was irradiated on the Invar alloy with air blowing at the condition of various laser peak power. An ablation characteristic of the Invar alloy was appeared non-linear at $125J/cm^2$ of energy fluence. For the application to a shadow mask, the hole drilling of the Invar alloy with the cross section of a trapezoidal shape was investigated. The ablated micro-holes were characterized using an atomic force microscopy(AFM). The optimal condition of hole pattern f3r a shadow mask was $4\;{\mu}m$ z-axis feed rate, 0.2mm/s circular velocity, $26.4{\mu}J$ laser peak power. With the optimal processing condition, the fine circular hole shape without burr and thermal damage was achieved. Using the femtoseocond laser system, it demonstrates excellent tool for the Invar alloy micro-hole drilling without heat effects and poor edge.

반응표면분석법을 이용한 쌀 단백질 초고압 추출조건 최적화 (Optimization of the High-Pressure Condition for Rice Protein Extracting Using Response Surface Methodology (RSM))

  • 라하나;박사라;김하윤;조용식;김경미
    • 한국식생활문화학회지
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    • 제34권6호
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    • pp.779-784
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    • 2019
  • The purpose of this study was to optimize the rice protein extracted using a response surface methodology. The experiment was designed based on a CCD (Central Composite Design), and the independent variables were the high pressure (X1, 0-400 MPa) and processing time (X2, 0-10 minutes). The results of the extraction content (Y1), residue content (Y2), and recovery yield (Y3) were fitted to a response surface methodology model (R2= 0.92, 0.92, and 0.93, respectively). Increasing the pressure and processing time has a positive effect on the extraction content (Y1), residue content (Y2), and recovery yield (Y3). Therefore, these high-pressure conditions (independent variables) can significantly affect the improvement in rice protein extraction efficiency. Thus, the optimal conditions of X1 and X2 were 400 MPa and 10 min., respectively. Under these optimal conditions, the predicted values of Y1, Y2, and Y3 were 62.93, 57.53 mg/g, and 91.76%, respectively.

급수 가압 멀티 펌프 시스템의 컨트롤러 개발 (Controller Development of Booster Multi-Pump System)

  • 이상균;이재춘;이병훈;황민규
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.382-384
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    • 1996
  • This paper introduces the controller development of booster multi-pump system with constantly estimated control algorithm. Through analyzing by the experiment of optimal pressure with a certain flow rate. The larger pressure processing apparatus in microprocessor makes optimal water-supplying. This method is implemented with the only pure control algorithm without any other mechanical or circuitry apparatus. Also, Pump's life is lengthened by exchanging simple on, off and rotational inverter control. Optimal condition for pump is adjusted by the inverter control, and compact control panel helps the booster system install in real field.

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반용융 다이캐스팅 공정에 있어서 플런저 팁의 형상이 성형성에 미치는 영향 (The Effect of Plunger Tip Shape on the Formability in Semi-Solid Die Casting Process)

  • 서판기;손영익;강충길
    • 소성∙가공
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    • 제11권4호
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    • pp.312-322
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    • 2002
  • In this study, an innovative semi-solid die casting technology to replace heavier cast iron compressor parts with lightweight aluminum castings was proposed, and the application possibility for home-appliance component was investigated. The most important factors regarding the semi-solid die casting process are the reheating process of the raw materials to the semi-solid state, specifications of the forming machine, the optimal injection conditions and die design. Materials used in this study were A3S7 and hSn alloys fabricated by the electromagnetic stirring process. The optimal injection conditions for semi-solid die casting process were Presented with the reheating conditions of the semi-solid materials. To investigate the effect of plunger tip shape on the formability and mechanical properties in semi-solid die casting process for complicated shape part, two kinds of plunger tip shape with long and short plunger tip taper are proposed.

단순보강링을 갖는 압출 금형의 치수 최적설계 (Optimal Design of Dimension of Extrusion Die with Single Stress Ring)

  • 안성찬;임용택
    • 소성∙가공
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    • 제11권4호
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    • pp.363-370
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    • 2002
  • In this study, an optimal design technique was investigated for determining appropriate dimensions of components of the die set used in the extrusion process. For this, an axi-symmetric elastic finite element program for the analysis of deformation of the shrink fitted die set was developed with the Lagrange multiplier method to implement the constraint condition of shrink fit of stress ring. By coupling the rigid-viscoplastic analysis of extrusion process by CAMPform and elastic analysis of the die set, the optimization study was made by employing optimization program DOT. Considering the various assembly conditions, optimal design was determined for a single stress ring case. It is construed that the proposed design method can be beneficial for improving the tool life of cold extrusion die set at practice.

근사모델과 후처리를 이용한 트러스 구조물의 이산 치수설계 (Discrete Sizing Design of Truss Structure Using an Approximate Model and Post-Processing)

  • 이권희
    • 한국기계가공학회지
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    • 제19권5호
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    • pp.27-37
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    • 2020
  • Structural optimization problems with discrete design variables require more function calculations (or finite element analyses) than those in the continuous design space. In this study, a method to find an optimal solution in the discrete design of the truss structure is presented, reducing the number of function calculations. Because a continuous optimal solution is the Karush-Kuhn-Tucker point that satisfies the optimality condition, it is assumed that the discrete optimal solution is around the continuous optimum. Then, response values such as weight, displacement, and stress are predicted using approximate models-referred to as hybrid metamodels-within specified design ranges. The discrete design method using the hybrid metamodels is used as a post-process of the continuous optimization process. Standard truss design problems of 10-bar, 25-bar, 15-bar, and 52-bar are solved to show the usefulness of this method. The results are compared with those of existing methods.

반용융 알루미늄 합금의 재가열 및 Thixoforging 부품의 기계적 성질 (Reheating of Semi-Solid Aluminum Alloys and Mechanical Properties of Thixoforged Product)

  • 정홍규;강충길
    • 소성∙가공
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    • 제8권5호
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    • pp.437-448
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    • 1999
  • The reheating of the billet in the semi-solid state as quickly and homogeneously as possible is one of the most imposrtant parts. To obtain a fine globular microstructure in cross section of billet, the optimal design of the induction coil for variation of alloys and specimen sizes is necessary. For the thixo-forging process the construction of the reheating data base is very important, because the reheating conditions are different for variation of SSM and billet sizes. So in this study, the optimal coil design of A356 (ALTHIX) and Aι2024 with d×ι=60×90 (mm) to obtain the globular microstructure is theoretically proposed. The suitability of an optimal coil design will be demonstrated by reheating experiments. Finally, the thixoformability of an arbitrarily shaped product is evaluated by its forming variables. The defects and mechanical properties are also investigated.

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반응표면분석법을 이용한 천마의 열수 추출조건 설정 (Hot-water Extraction Condition of Gastrodia elata Blume by Response Surface Methodology)

  • 김성호;김인호;강복희;이상한;김종현;이진만
    • 한국식품저장유통학회지
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    • 제13권2호
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    • pp.131-137
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    • 2006
  • 천마를 건강기능식품가공소재로서 효율적으로 이용하기 위해서는 가공 중 일어날 수 있는 유효성분의 파괴를 최소화하는 것이 필요하다. 본 연구에서는 전처리 과정중 추출조건별로 천마의 유효성분 함량 및 항산화적 특성을 반응표면분석법으로 모니터링하여 최적 추출조건을 설정하였다. 천마 열수 추출물의 vanillyl alcohol 함량은 추출온도 $91.07^{\circ}C$, 추출시간 2.64 hr 및 시료에 대한 용매비 15.16 mL/g에서 가장 높은 함량을 나타내었고, vanillin 함량은 $93.73^{\circ}C$, 2.58 ,21.56 mL/g에서 coumarin 함량은 $96.30^{\circ}C$, 3.84 hr, 19.88 mL/g에서 각각 최고의 함량을 나타내는 것으로 예측되었다. 총 페놀성 화합물의 함량은 추출온도 $98.14^{\circ}C$, 추출시간 3.20 및 시료에 대한 용매비 18.63 mL/g, 전자공여능에 대한 최적 조건은 $98.62^{\circ}C$, 3.82 hr, 16.46 mL/g 등으로 각각 나타났다. 각 변수에 대한 회귀식을 도출하여 공정 인자별 천마의 유효성분 및 항산화적 특성에 대한 최적 추출조건을 superimposing한 결과 추출온도 $90{\sim}100^{\circ}C$, 추출시간 $3{\sim}4hr$ 및 시료에 대한 용매비 $15{\sim}20mL/g$의 범위로 각각 예측되었다.

Embedded System 기반 Vision Box 설계와 적용 (Design and Application of Vision Box Based on Embedded System)

  • 이종혁
    • 한국정보통신학회논문지
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    • 제13권8호
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    • pp.1601-1607
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    • 2009
  • 비전 시스템은 카메라를 통하여 획득한 이미지 정보를 캡쳐 후, 이를 분석하여 물체를 인식하는 것으로서, 차종 분류를 포함 한 다양한 산업현장에서 사용하고 있다. 이런 필요성으로 인하여 차종 분류를 위한 많은 연구가 이루어지고 있으나 복잡한 계산과정으로 인하여 처리 시간이 많이 소요되는 단점이 있다. 본 논문에서는 임베디드 시스템을 기반으로 하는 Vision Box를 설계하고 이를 사용한 차종인식 시스템을 제안하였다. 제안한 Vision Box의 성능을 자동차의 차종분류를 통한 사전 테스트 결과 최적 화된 환경 조건에서는 100%의 차종별 인식률을 보였으며, 조명 및 회전의 작은 변화에 따른 테스트에서 차종인식은 가능하였으나, 패턴점수가 낮아졌다. 제안한 Vision Box 시스템을 산업 현장에 적용한 결과 처리시간, 인식률 등에서 산업체의 요구 조건을 만족 할 수 있음을 확인할 수 일었다.