• Title/Summary/Keyword: In-line array

Search Result 582, Processing Time 0.029 seconds

A Study on the Application of Line Array Roll Set Process to Shipbuilding Industry (선형 배열 롤 셋 공정의 조선 산업 적용에 관한 연구)

  • Shim, D.S.;Yang, D.Y.;Chung, S.W.;Han, M.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2009.10a
    • /
    • pp.289-292
    • /
    • 2009
  • The line array roll set process, as one of many kinds of incremental forming processes, is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has considerable potential for shipbuilding applications. In a shipbuilding yard, hull forming is an important fabrication process in which flat plates are deformed into singly or doubly curved plates. The major purpose of the present study is to estimate experimentally the general applicability of the line array roll set process for the manufacture of ship hull plates. In this study, the target shapes are selected through investigation of the shape classification of ship hull plates that comprise a certain vessel. Forming processes for twisted shapes are analyzed with the finite element method (FEM). Finally, the results of experimental work for two types of target shapes are presented.

  • PDF

NIR DIODE ARRAY SPECTROMETERS ON AGRICULTURAL HARVEST MACHINES OVERVIEW AND OUTLOOK

  • Rode, Michael
    • Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
    • /
    • 2001.06a
    • /
    • pp.1172-1172
    • /
    • 2001
  • Compact Near Infrared Diode Array Spectrometers offer new possibilities for on line quality assurance in the agricultural sector. Due to their speed and complete robustness towards temperature fluctuations and mechanical shock Diode Array Spectrometers are suitable for the use on Agricultural Harvest Machines. The growing consumer consciousness of food quality in combination with falling manufacturing prices demands procedures for an effective quality control system. The various conventional types of NIR instruments which have so far been used in laboratories are unsuitable for mobile applications under the rough conditions of field cropping not only because of their slow speed of measurement but also because of their shock sensitive filter wheels and monochromators necessary for fractionating polychromatic light. Another advantage of the on line use is the reduction of the sampling error because of the continuously measurement of the whole product. Considering the large economic importance of the dry matter content on agricultural products it is of particular advantage that water belongs to those constituents which are most easily assessed in the near infrared. While other constituents of economic importance such as starch, oil and protein in grains and seeds have a much lesser effect on NIR signals, their contents can nonetheless be assessed with high analytical precision on freshly harvested grains and seeds. In the last years several applications for on line quality assessment on harvesting machines were developed and tested. The talk will give an overview and outlook on existing and future possibilities of this new field of NIR applications.

  • PDF

A Study on the Application of Line Array Roll Set Process for the Manufacture of Real Ship Hull Plates (실선체 곡면 제작을 위한 선형 배열 롤 셋 공정의 적용에 관한 연구)

  • Shim, D.S.;Yang, D.Y.;Chung, S.W.;Han, M.S.
    • Transactions of Materials Processing
    • /
    • v.19 no.2
    • /
    • pp.120-126
    • /
    • 2010
  • The line array roll set(LARS) process, as one of many kinds of incremental forming processes, is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has good potential for shipbuilding applications. The major purpose of the present study is to estimate experimentally the general applicability of the line array roll set process for the manufacture of ship hull plates. In this study, the target shapes are selected through investigation of the shape classification of ship hull plates that comprise a certain vessel. Forming processes for twisted shapes are analyzed with the finite element method(FEM) and the results of experimental work are presented. On the basis of the experimental and numerical results, the LARS process is applied to the production of real outer hull plates of a small patrol ship.

Fabrication of low-stress silicon nitride film for application to biochemical sensor array

  • Sohn, Young-Soo
    • Journal of Sensor Science and Technology
    • /
    • v.14 no.5
    • /
    • pp.357-361
    • /
    • 2005
  • Low-stress silicon nitride (LSN) thin films with embedded metal line have been developed as free standing structures to keep microspheres in proper locations and localized heat source for application to a chip-based sensor array for the simultaneous and near-real-time detection of multiple analytes in solution. The LSN film has been utilized as a structural material as well as a hard mask layer for wet anisotropic etching of silicon. The LSN was deposited by LPCVD (Low Pressure Chemical Vapor Deposition) process by varing the ratio of source gas flows. The residual stress of the LSN film was measured by laser curvature method. The residual stress of the LSN film is 6 times lower than that of the stoichiometric silicon nitride film. The test results showed that not only the LSN film but also the stack of LSN layers with embedded metal line could stand without notable deflection.

A Study on the Efficient Extraction of Slot Admittance for the Design of a Non-Resonant Waveguide Edge Slot Array (비공진형 협벽 도파관 슬롯 배열 설계를 위한 효율적인 슬릇 어드미턴스 추출 방법에 관한 연구)

  • Park, Jong-Kuk;Han, Ki-Jin;Na, Hyung-Gi;Kim, Chan-Hong;Lee, Dong-Kook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.19 no.11
    • /
    • pp.1223-1232
    • /
    • 2008
  • In this paper, an analytic method is proposed to extract the reference slot admittance required for the design of a non-resonant waveguide edge slot array. A slot and two neighboring transmission line sections of the numerous alternately inclined slots with the identical inclination angle are modelled as a uniform lossy transmission line, and thus, the total ABCD matrix is easily calculated and compared with the simulated or measured one. From this procedure, the complex characteristic impedance and the complex propagation constant of the lossy transmission line are calculated and the normalized slot admittance is analytically obtained. In order to validate the proposed method, the admittance value of a reference slotted waveguide fabricated for designing the X-band edge slot array is extracted and it is compared with the one obtained by the other conventional method.

Comparison of independent component analysis algorithms for low-frequency interference of passive line array sonars (수동 선배열 소나의 저주파 간섭 신호에 대한 독립성분분석 알고리즘 비교)

  • Kim, Juho;Ashraf, Hina;Lee, Chong-Hyun;Cheong, Myoung Jun
    • The Journal of the Acoustical Society of Korea
    • /
    • v.38 no.2
    • /
    • pp.177-183
    • /
    • 2019
  • In this paper, we proposed an application method of ICA (Independent Component Analysis) to passive line array sonar to separate interferences from target signals in low frequency band and compared performance of three conventional ICA algorithms. Since the low frequency signals are received through larger bearing angles than other frequency bands, neighboring beam signals can be used to perform ICA as measurement signals of the ICA. We use three ICA algorithms such as Fast ICA, NNMF (Non-negative Matrix Factorization) and JADE (Joint Approximation Diagonalization of Eigen-matrices). Through experiments on real data obtained from passive line array sonar, it is verified that the interference can be separable from target signals by the suggested method and the JADE algorithm shows the best separation performance among the three algorithms.

Design of 8 Channel Insertional pTx Array Coil for 3T Body Imaging (8 채널 삽입형 3T Body pTx Array 코일 설계)

  • Kim, Young Beom;Ryu, Yeunchul
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.63 no.4
    • /
    • pp.546-550
    • /
    • 2014
  • In this research, we report all the elements are placed in the space above the patient table as a transmit coil to give optimized B1+ field for the body object. Through the simulations, we compared upper-and-lower parts combined 8 channel Tx array to upper only 8 channel Tx array and showed the utilities of B1+ shimming in multi-channel Tx body imaging at 3T. Half-cylinder shaped upper array shows weak B1+ field area around back of patient without B1+ shimming. After B1+ shimming, highly induced SAR places occurred in the arm region due to the close distance to the both end elements which were driven by very high RF current to enhance B1+ in back area. The proposed upper and lower combined array provides an enhanced homogeneous B1+ field in large ROI imaging as a result of shimming over the body size phantom. Through this research we proved the usefulness of the proposed insertional upper and lower parts combined transmit array for 3T body imaging.

Design of the Dual-Band Electrical Beam Tilting Array Antenna with Bi-Directional Directivity (양방향 지향성을 갖는 이중 대역 전기적 빔 틸팅 배열 안테나 설계)

  • Jeon, Hoo-Dong;Heo, Soo-Young;Ko, Ji-Hwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.27 no.7
    • /
    • pp.612-619
    • /
    • 2016
  • In this paper, a dual band electrical beam tilting array antenna with bi-directional directivity is designed. Radiating element operates at dual-resonance frequencies and is designed as planar dipole using PCB. In order to tilt the main beam, the phase delay line is designed by use of only the phase shifting line of a $50\Omega$ microstrip line for broadband. The designed antenna has tilting angle of $0^{\circ}$ to ${\pm}8^{\circ}$. For validation of the designed antenna specification, the array antenna is fabricated and the performances are measured. Comparison between theory and experiment shows good agreement.

Development of Target Signal Simulator for Towed Line Array Sonar (선배열 예인음탐기 표적신호 시뮬레이터 개발)

  • Son, Kweon;Choi, Jae-Yong
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.6 no.3
    • /
    • pp.36-43
    • /
    • 2003
  • Multi-target away signal simulator which can simulate the radiated noises of maneuvering targets in a specified ocean range is an essential equipment for the validation of developed towed array sonar system. This simulator should provide realistic multi-channel signals those are required for beamforming on the signal processing unit of towed away system. This paper describes the overall system configuration and signal synthesis techniques for the target radiated noise. And this paper considers why the time delays between target and individual sensors are caused and how to compensate these time delays to individual sensors output. This multi-purpose target simulator could be used for the training of TASS operators.

A Study on the Optimal Design of Large-scale Photovoltaic Array (대용량 PV 어레이의 최적설계에 관한 연구)

  • Hwang, In-Ho;Kim, Eui-Hwan;Ahn, Kyo-Sang
    • Journal of the Korean Solar Energy Society
    • /
    • v.31 no.1
    • /
    • pp.8-14
    • /
    • 2011
  • Recently, a number of large-scale photovoltaic(PV) power generation system has been installed all over the world. Thus, in order to improve the system efficiency, the optimal design of the large-scale PV systems has become an important issue. DC cable loss of PV array is one of the design factors related to the system efficiency. This paper introduces the array design method of a 500kW Photovoltaic power plant. Three types of the PV array are suggested. Also, string cables, sub-array cables and array cables are designed within 1% of voltage drop in the line, and the DC cable losses are analyzed. The results of this paper show that the DC cable loss of large-scale PV array can be reduced by adopting a proper sub-array design method.