• 제목/요약/키워드: Front Panel

검색결과 218건 처리시간 0.031초

철도 방음벽의 전면 타공과 흡음재에 의한 흡음성능 고찰 (Investigation of Sound Absorbing Characteristics of the Railway Noise Barrier by Changing the Configuration of the Front Perforated Panel and Absorbing Material)

  • 김관주;김상헌;박진규
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2013년도 추계학술대회 논문집
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    • pp.575-580
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    • 2013
  • This study focused on the identification of sound characteristics according to the configuration of sound absorption material and perforated panel dimensions. Noise barriers consist of front perforated panel, sound absorption material and back plate. Noise barriers' acoustic performance should be required to meet the NRC of 0.7. The absorbing performance of the noise barrier relies on the opening ratio of perforated panel and the efficiency of the absorbing material. This study try to find out the possibilities of applications to railway usage.

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흡음형 방음벽의 성능향상에 관한 연구 (A Study on Performance Improvement of Sound Absorbing Noise Barrier)

  • 김현실;김재승;강현주;김봉기;김상렬
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 추계학술대회논문집 II
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    • pp.849-854
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    • 2001
  • A study on performance of the sound absorbing noise barrier is presented. Noise barrier of sound absorbing type is composed of the front panel, sound absorbing material, and back panel. For allowing sound path, front panel is usually perforated. The performance of the noise barrier is governed by the opening ratio of the perforated panel, sound absorption coefficient of the sound absorbing material. In this study, the effects of the opening ratio, diameter of the hole, thickness of the sound absorbing material are investigated. It is found that the thickness of the sound absorbing material must be at least 50 mm to ensure the required minimum NRC value 0.70, and the opening ratio is greater than 0.2. It is shown that the thickness of the back panel is crucial in providing required STL (Sound Transmission Loss) value. The performance of the developed noise barrier is measured, where its sound absorbing coefficient and sound transmission loss satisfy the criteria.

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슬림형 룸에어컨 설계 인자에 관한 연구 (Numerical and Experimental Analysis of Design Parameters of a Slim Room Air-conditioner)

  • 신종진;이희술;김종문;민준기;오상경
    • 설비공학논문집
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    • 제17권2호
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    • pp.95-100
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    • 2005
  • Numerical simulations and experiments were conducted to analyze the design parameters for a slim room air-conditioner. These design parameters included a fan shape, a front panel, a scroll shape, a bell mouth, a distance between a fan and a heat exchanger, etc. Each design parameter was analyzed numerically and/or experimentally in terms of the flow rate and the sound pressure level, which should be the most influential factors for developing the slim room air-conditioner. The fan with a uniform height showed a better performance than that with a linearly varying height. It is recommended to use a front grill rather than a front panel according to sound pressure levels since the front panel itself is a huge resistance to the inlet flow. A redesigned scroll shape by changing the rotational direction of a fan also contributed a lot to lowering the sound pressure level. There existed a distance between a fan and a heat exchanger, where flow rates increased effectively.

PDP용 격벽재의 승온 탈가스 특성 (Characteristics of Outgas from Heated Barrier Rib for POP)

  • 김선호;주정훈;이석영;이강욱;오상진
    • 한국표면공학회지
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    • 제37권3호
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    • pp.185-190
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    • 2004
  • Plasma Display Panel is a display device emitting fluorescent light from gas discharge between a front and a rear panel sealed together. Front and rear panel have multitude of film layers and barrier ribs in the rear panel has the largest area so releasing various gases and affecting light emitting characteristics and lifetime. The remaining gases in a barrier rib were studied by thermal desorption analysis up to $400^{\circ}C$ and main gases were $H_2$ $H_2$O, CO. During sustaining at $300^{\circ}C$, the outgassing rates from other gases were decreased but$ H_2$ kept constantly increasing until 1 hour, which can be originated from the dissociation of organics remained in the inside of barrier rib material. In $H_2$O, two distinct peaks were observed: desorption from physically adsorbed one at $l00^{\circ}C$ and from chemically adsorbed one $400^{\circ}C$. The result can be utilized in interpretation of electronic and optical characteristics and evacuation process control of PDP

LaVIEW를 이용한 휴대용 3상 소형유도전동기 회전자 바 고장 진단 시스템 개발 (The Development of Portable Rotor Bar Fault Diagnosis System for Three Phase Small Induction Motors Using LabVIEW)

  • 송명현;박규남;한동기;이태훈;우혁재
    • 전기학회논문지P
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    • 제56권1호
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    • pp.51-55
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    • 2007
  • In this paper, a portable rotor bar fault diagnosis system for small 3 phase induction motors is suggested. For portable real-tine diagnosis system, an USB-DAQ board for collecting the 3 phase current data, three current probes, and a notebook computer are used. The LabVIEW graphical language is used for filtering, analysis, storing, and monitoring the current data. The three phase stator current are filtered and transformed to frequency level by FIT. An analysis window programed by LabVIEW is located in front panel to show the FIT results and this suggested window has a zooming function to detect the fault feature more easily near the feature frequency range which is varying by the slip frequency. To show the possibility of portable rotor bar diagnosis system, three types(healthy, one rotor bar fault, two rotor bar fault) of rotor bar are intentionally prepared and compared by the suggested window of front panel. Experimental results are shown that a suggested diagnosis system is applicable to portable diagnosis system and the rotor bar fault is detected by the frequency window in front panel programed in LabVIEW graphical language.

Effect of the Front Dielectric Layer on the Efficacy of the Plasma Display Panel

  • Moon, Won-Seok;Oh, Jin-Mok;Seo, Byung-Hwa;Lee, Sung-Wook;Byun, Na-Mi;Cho, Yun-Hui;Ryu, Byung-Gil;Kim, Sung-Tae
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.31-34
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    • 2009
  • We investigated the effect of relative dielectric constant of front dielectric layer on the efficacy of plasma display panel. Dielectric materials with relative dielectric constant of around 6 and 7 were developed. When the front dielectric layer had a low relative dielectric constant, power consumption decreased more than luminance did. And it led to efficacy enhancement. However, the minimum sustain voltage increased.

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Effect of Some Design Factors in the Front Panel on the Characteristics of a Plasma Display

  • Kim, Beong-Ju;Moon, Chelo-Hee
    • Journal of Information Display
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    • 제9권3호
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    • pp.28-32
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    • 2008
  • Low sustained voltage $(V_s)$ and high luminous efficiency (lumen/Watts) are required for the enhanced performance of an AC PDP. Both are not realized in the same condition, however, because luminous efficiency decreases when the sustained voltage is lowered in most cases. In this study, the three design factors in the front panel of a PDP, i.e., the thickness and position of the bus electrode and the thickness of the dielectric layer, were chosen to investigate how they affect the sustained voltage and the luminous efficiency, and to find a way to optimize them. Two values were given to each of the three design factors, and experiments were done via full factorial design, i.e., with a total of eight conditions, using a 3-in.diagonal test panel. The changes in the sustained voltage and the luminous characteristics were explained in connection with the discharge characteristics of the PDP cells.

온도 환경 변화에 따른 평판형 TV 모서리 파손 방지를 위한 구조 설계 연구 (Study on Corner Crack Protection for Various Thermal Environment in Flat Panel Displays)

  • 김민근;김성기
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회A
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    • pp.678-682
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    • 2007
  • It is conducted that study on corner crack protection for various thermal environment in a flat panel display. Most of the consumer electronics consist of a plastic and a metal structure. And different properties of materials could cause failure of structural reliability due to the various operating temperatures. Especially for front bezel with thin and slender structure, the effect of temperature is significant, and the design for crack protection is crucial for thermal reliability of displays. In this study, it is prescribed the behavior of the front bezel in flat panel display for various operation temperatures and proposed design parameters to ensure the structural reliability of displays.

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Transparent dielectric layer having color-filter function for PDP

  • Lee, Sung-Wook;Kwon, Tae-In;Lee, Yoon-Kwan;Ryu, Byung-Gil;Yoo, Eun-Ho;Park, Myung-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.632-634
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    • 2002
  • Transparent dielectric layer having color-filter function in front panel for PDP(Plasma Display Panel) was successfully fabricated and characterized. Transparent dielectric layer in front panel was made of glass based on $PbO-SiO_2-B_2O_3$ ternary system. The change of properties with content variation of oxide colorants in transparent dielectric layer having color-filter function was systematically accessed. It was demonstrated that the optimized content of oxide colorants to parent glass could greatly increase up contrast ratio and color temperature without significantly degrading luminance.

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