• Title/Summary/Keyword: Panel method

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Flow Analysis around a Wing Section by a Piecewise Linear Panel Method (부분선형 패널법을 이용한 2차원 날개단면 주위 유동 해석)

  • Park, Gi-Duck;Oh, Jin-An;Lee, Jin-Tae
    • Journal of the Society of Naval Architects of Korea
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    • v.52 no.5
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    • pp.380-386
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    • 2015
  • Panel methods are useful tools for analyzing fluid-flow around a wing section. It has the advantage of fast and accurate calculation, compared to other CFD Methods such as RANS solvers. This paper suggests a piecewise linear panel method in order to improve accuracy of existing panel methods by changing the piecewise constant singularity strength to linear singularity strength(for dipole strength). The piecewise linear panel method adopts the linear distribution of singularity strength, while control point is located at the node of each panel. Formulation of the piecewise linear panel method is given, and some calculation results are shown for typical wing sections.

Variable Free Surface Panel Method for Potential Flow Analysis around a Ship (가변 자유수면 패널법을 이용한 선체 주위 포텐셜 유동 해석)

  • Choi, Hee-Jong;Kim, Jin;Van, Suak-Ho;Park, Il-Ryong;Kim, Kwang-Soo
    • Journal of the Society of Naval Architects of Korea
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    • v.45 no.1
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    • pp.54-62
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    • 2008
  • A new solution method was developed to solve the free surface flow around a hull and named as 'Variable Free Surface Panel Method'. In the method the non-linearity of the free surface boundary conditions was fully taken into account and the raised panel method was employed to effectively solve the problem. The transom stern flow was also considered and the panel on the hull was generated using the panel cutting method. Numerical calculations were performed for KCS(KRISO Container Ship) hull form and compared with the experimental data to confirm the validity of the method. The comparison with the conventional free surface panel method was also accomplished. It is confirmed that new method gives more reliable results than the conventional method.

A Study on the Adhesive Performance of Adhesive Method between Concrete Surface and Fiber Panel (콘크리트 바탕면과 섬유 패널 사이 접착제의 부착 방법에 따른 부착 성능 연구)

  • Seo, Man-Sik;Park, Wan-Goo;Choi, Su-Young;Kim, Dong-Bum;Kim, Byoung-Il;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.163-164
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    • 2018
  • In this study, the adhesion performance of the adhesive between the concrete base and the fiber panel was verified through experiments. Attachment to all three types by applying adhesive to panel and attaching to CRC board surface, method of applying adhesive to CRC board surface by panel, method of applying adhesive on panel and CRC board surface respectively, As a result of the performance test, the adhesive strength of the panel attached to the panel on the CRC board after the application of the adhesive was highest on both the back surface of the panel and the surface of the CRC board.

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Calculation of Wave Resistance for a Submerged Body by a Higher Order Panel Method (고차 판요소법을 이용한 몰수체의 조파저항 계산)

  • Chang-Gu Kang;Se-Eun Kim
    • Journal of the Society of Naval Architects of Korea
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    • v.29 no.4
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    • pp.58-65
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    • 1992
  • In this paper, wave resistance for a submerged body is calculated by a higher order panel method. The Neumann-Kelvin problem is solved by the source or normal dipole distribution method. The body surface is represented by a bicubic B-spline and the singularity strengths are approximated by a bilinear form. The results calculated by the higher order panel method are compared with those by the lowest order panel method developed by Hess & Smith. The convergence rate of the higher order panel method is much better than the lowest order panel method. But the wave resistance calculated by the higher order panel method still shows discrepancy with an analytic solution at low Froude number like that by the lowest order panel method.

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Panel cutting method: new approach to generate panels on a hull in Rankine source potential approximation

  • Choi, Hee-Jong;Chun, Ho-Hwan;Park, Il-Ryong;Kim, Jin
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.3 no.4
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    • pp.225-232
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    • 2011
  • In the present study, a new hull panel generation algorithm, namely panel cutting method, was developed to predict flow phenomena around a ship using the Rankine source potential based panel method, where the iterative method was used to satisfy the nonlinear free surface condition and the trim and sinkage of the ship was taken into account. Numerical computations were performed to investigate the validity of the proposed hull panel generation algorithm for Series 60 ($C_B$=0.60) hull and KRISO container ship (KCS), a container ship designed by Maritime and Ocean Engineering Research Institute (MOERI). The computational results were validated by comparing with the existing experimental data.

An Effective Auto-Focusing Method for Curved Panel Inspection System (곡면 패널 검사를 위한 효율적인 오토 포커싱 방법)

  • Lee, Hwang-Ju;Park, Tae-Hyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.4
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    • pp.709-714
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    • 2017
  • The curved panel is widely used for display of TVs and smart phones. This paper proposes a new auto-focusing method for curved panel inspection system. Since the distance between the camera and the panel varies with the curve position, the camera should change its focus at every inspection time. In order to reduce the focusing time, we propose an effective focusing method that considers the mathematical model of panel curve. The Lagrange polynomial equation is applied to modeling the panel curve. The foci of initial three points are used to get the curve equation, and the other foci are calculated automatically from the curve equation. The experiment result shows that the proposed method can reduce the focusing time.

A study on the improvement of sound absorption coefficient of an honeycomb panel by the core resonance (코어공명을 이용한 허니콤패널의 흡음율 개선에 관한 연구)

  • Yu, Y.H.
    • Journal of Power System Engineering
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    • v.12 no.4
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    • pp.46-51
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    • 2008
  • Honeycomb panel has a constructive advantage because it is constructed with a honeycomb core, so it has relatively higher strength ratio to weight. Therefore honeycomb panel has been used as the light weight panels in the high-speed railway technology and high-speed ship like as cruise yachts. Also it has been used in the aircraft and aerospace industry as a structural panel because light weight structure is indispensible in that field of industry. Recently, the honeycomb panel is embossed in the viewpoints of high oil prices as the lightweight panel of the transport machine, however the sound insulation capacity of the honeycomb panel is poorer than those of uniform and another sandwich panels. In this paper a method to improving the sound absorption coefficient of a honeycomb panel Is studied by using the Helmholtz resonator. The sound absorption coefficients for some kinds of honeycomb cores are demonstrated by the normal incident absorption coefficient method.

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Rubbing Process Evaluation Method for The LCD Panel

  • Honoki, Hideyuki;Sakai, Kaoru;Kawabe, Shun'Ichi;Nakasu, Nobuaki
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.115-117
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    • 2002
  • In order to realize a stable rubbing process for the liquid crystal panel, the authors investigated the quantitative evaluation method of rubbing process uniformity. The proposed method focuses on the relationship between the image quality of the LCD panel for gray scale images and the rubbing uniformity. The proposed method indicates rubbing uniformity using quantitative parameters of spots and hairlines on the LCD panel.

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AN ANALYSIS OF THE AERODYNAMIC CHARACTERISTICS OF A T-50 CONFIGURATION USING A PANEL CODE AND ITS VALIDATION (패널코드를 이용한 T-50 형상의 공력특성 예측 및 검증)

  • Park, S.W.;Kim, D.J.;Je, S.E.;Myong, R.S.;Cho, T.H.
    • 한국전산유체공학회:학술대회논문집
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    • 2006.10a
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    • pp.131-135
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    • 2006
  • The aerodynamic characteristics of a T-50 aircraft configuration are investigated by a subsonic panel method. Panel methods are best applicable to the lifting surfaces such as wings and airfoils. Source and doublets are used in the present code as a basic singularities of the panel technique. The panel method is first assessed by applying it to several benchmark problems for which other solutions and experimental data are available, such as a swept wing and wing body configuration. The prediction results are compared with experimental data and show good agreement in all cases considered. Finally, the method is applied to a T-50 aircraft configuration and excellent agreement with flight test data in lift coefficients is found.

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A Study on Touchless Panel based Interactive Contents Service using IrDA Matrix

  • Lee, Minwoo;Lee, Dongwoo;Kim, Daehyeon;Ann, Myungsuk;Lee, Junghoon;Lee, Seungyoun;Cho, Juphil;Shin, Jaekwon;Cha, Jaesang
    • International Journal of Internet, Broadcasting and Communication
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    • v.7 no.2
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    • pp.73-78
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    • 2015
  • Touch panel is mainly applied to pressure type touch panel but it occur a low recognition rate and error during long-term use. So, it is partly applied to capacitive touch panel to compensate for these problems but it also can occur a same problems via pollutions. Touch technology has developed a various method but it is not used because of high costs and difficult installation process. So, in this paper, we proposed an input method of touchless panel using IrDA matrix. This method is conducted using an IrDA Matrix composed of depth sensor. It is possible to offer a various contents for multi user. The proposed technology need a development of a high sensitivity sensing method and high-speed processing method of position information for Seamless operation control. And, it is required high-precision drive technology. Also, we proposed a Seamless user recognition for interactive contents service through a touchless panel using IrDA matrix.