• Title/Summary/Keyword: 다꾸찌 실험계획법

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Degradation Characteristics Phosphor Used in Self-Luminous Glass Tube with Taguchi Method (다꾸찌법을 이용한 자체 발광 유리관용 형광체 열화 특성)

  • 김경화;윤문영;권오환;염충섭
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2003.05a
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    • pp.377-382
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    • 2003
  • 본 연구의 대상인 자체발광 유리관은 밀봉된 유리관 내의 삼중수소에서 방출되는 베타입자와 유리관 내벽의 형광체와의 발광반응 메카니즘을 이용한 것이다. 자발광체는 삼중수소의 자연 붕괴와 형광체의 열화에 의해서 형광 효율이 감소되어 자발광체를 제조한 날로부터 지속적으로 휘도가 줄어들게 된다. 본 연구에서는 자발광체 제조 시 형광체의 열화를 최소화하기 위하여 형광체 열화에 영향을 미치는 요소인 온도, 온도 유지 시간, 공정 시 필요한 분위기를 다꾸지 방법에 의한 실험계획법으로 3인자 3수준의 교호작용을 고려하여 형광체의 음극선 발광 특성을 검토하였다.

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A Study on the Optimal Condition Determination of Laser Scattering Using the Design of Experiment (실험계획법을 이용한 레이저 산란의 최적 조건 결정에 대한 연구)

  • Han, Jae-Chul;Kim, Gyung-Bum
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.7
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    • pp.58-64
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    • 2009
  • In this paper, an inspection mechanism based on laser scattering has been developed for the surface evaluation of infrared cut-off filters, and optimum conditions of laser scattering are determined using the design of experiment. First of all, attributes and influence factors of laser scattering are investigated and then a laser scattering inspection mechanism is newly designed based on analyses of laser scattering parameters. Also, Taguchi method, one of experimental designs, is used for the optimum condition selection of laser scattering parameters and the optimum condition is determined in order to maximize the detection capability of surface defects. Experiments show that the proposed method is useful in a consistent and effective defect detection and can be applied to surface evaluation processes in manufacturing.

Reduction of Mimic Sound in Outside Mirrors Using Jury Test (청음 평가를 이용한 자동차 OUTSIDE MIRROR 의 MIMIC 소음 개선)

  • Lee Jeonghan;Ih Kangduck;Jeong Seung Gyun
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.393-396
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    • 2001
  • 차량 주행시 발생되는 소위 mimic 소음은 접이식 outside mirror의 접합부에서 발생하는 이음(異音)으로서 예민한 승객에게 지적된다. Mimic 소음은 2kHz이 상의 고주파 영역에서 특정 대역에 간헐적으로 발생하는 소음이며, 시간에 대해 앙상블 에버리지를 하는 일반적인 분석 방법으로는 나타나지 않는다. 그러나 주의 깊은 청취에 의해 그 존재를 분명히 느낄 수 있으므로 다꾸찌 시험 계획법에 의거 실험 샘플을 제작하여 녹음한 뒤, 청음 평가를 통하여 개선하는 과정을 거쳤다. 분석 결과 mimic 소음은 folding gap의 폭보다는 균일도를 유지하는 것이 중요하며, gap내의 공동(공동, cavity)을 메워 주는 것이 효과적이라는 결론을 얻었다.

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A Study on the Impacts of Mirror Design Parameters on the Wind Noise (미러 형상인자가 바람소리에 미치는 영향에 대한 연구)

  • Ih, Kang-Duck
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.130-136
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    • 2009
  • The goal of this paper is to develop a standard side mirror geometry that will perform well across multiple vehicles. One of the important performance attributes of a side mirror is the amount of wind noise generated under the flow conditions on a car. PowerFLOW can be used for Computer Aided Testing of the aeroacoustics performance of a design in addition to directing design modifications based on a detailed analysis of the flow structures responsible for the noise generation. Alternatively, a Design of Experiment (DOE) approach is useful to explore the design space without any a-priori assumptions of the effects of design parameter changes. Some general design guidelines regarding the significant mirror geometry factors will be determined which may help to reduce vehicle development time and cost in the future. The results of this research will also allow us to estimate the trade-off between cost saving and performance optimum related to using a standard mirror shape for different vehicles.

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Design and Experimental Results for Cooling Tubes of Ultrasonic Bonding Equipment of Ultrasonic Bonding Equipment (초음파 접합 장치의 냉각관 설계 및 접합강도 실험)

  • Lee, DongWook;Jeon, EuySick
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.4
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    • pp.1879-1884
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    • 2014
  • Recently, the micro bonding technology comes into the spotlight as the miniaturization of the electronic product. The micro bonding technique can classify by way of laser welding and ultrasonic bonding and etc. However, the research on the micro bonding is much lacks. In this paper, carried out the cooling analysis of the 60 [kHz] ultrasonic bonding equipment to know heat effect of the piezoelectric element when the ultrasonic bonding equipment was operated. The ultrasonic horn having the natural frequency with 60 [kHz] for the dissimilar material bonding of the glass and solder tried to be designed. The parameters and response was set through the basic experiment. The dissimilar material bonding strength analysis using the 60 [kHz] ultrasonic bonding equipment was done. We carried out the bonding for improving bonding strength to using the silver paste. air thightness of bonding surface was confirmed by analysis of bonding interfaces.

A Study on the Electrical Discharge Blind Hole Tap Machining of STD11 with Copper Electrode (구리전극봉을 이용한 합금공구강재(STD11)의 비관통 방전 탭 가공에 관한 연구)

  • Park, In-Soo;Wang, Duck-Hyun;Kim, Gi-Tae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.3
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    • pp.38-44
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    • 2017
  • The technology of electrical discharge tap machining may be appropriate for making thread out of highly brittle material. Especially, it is very difficult to machine tap with the traditional method if the brittle material has been hardened by quenching. In this study, the shape of electrical discharge blind hole tap machining was analyzed by discharge time, discharge current, and the flushing hole condition after quenched the tool steel of STD11 has discharged the tap shape with a screw-shaped copper(Cu) electrode. An experimental design was planned and analyzed by Taguchi robust experimental design. The result showed that the shape of the blind hole discharge tap was influenced by the flushing hole, discharge time, and discharge current. The most important factor of the processing conditions was found to be the discharge current. When blind hole EDM with a copper electrode with a flushing hole was conducted, the discharged shape was found to be smooth and the angle of the discharged tapped thread was also found to be close to the thread angle of $60^{\circ}$. As the values of discharge time and discharge current increased, the EDMed surface coarsened due to the increase of the single discharge energy and the shape of the thread collapsing.