• Title/Summary/Keyword: Mounting method

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Wind load analysis for designing a tracking solar generator (추적식 태양광 발전기 설계를 위한 풍하중 해석)

  • Kim, Young-Eun;Jeong, Kyu-Won;Lee, Jae-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.2
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    • pp.672-680
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    • 2017
  • A solar photovoltaic system is composed of a module mounting structure, supporting trunk, and a control unit that supplies generated electrical power to an external power grid or a load. The efficiency of the system depends on the incident solar light, so the mounting structure is installed to face the sun. However, because the sun always moves, systems that track the sun have better efficiency than fixed systems. The structure experiences wind pressure, snow load, seismic load, and structure weight. The wind pressure has the most serious effect on the structure. The pressure was obtained using finite element method for various gaps between modules and angles between the panel and the ground. The wind pressure is lowest when the gap is zero, and it increases with the inclination angle. Based on the results, a mounting structure module was designed.

A Performance Analysis of Active Mount with Moving-Coil type Electromagnetic Actuator Installed on the Elastic Foundation (탄성지지된 가동코일형 능동마운트의 성능 분석)

  • Jung, Woo-Jin;Bae, Soo-Ryong;Jeon, Jae-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.227-231
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    • 2014
  • Underwater radiated noise is one of the vital factors in underwater weapon systems like submarine. A passive elastic mount is an effective reduction method for the vibration from a ship-board machinery transmitted to the hull which is radiated as noise outside the hull. A passive elastic mount shows the limitation on the vibration reduction and needs multi stage mounting system including double stage one to meet the required underwater radiated noise criteria. It is necessary for the multi stage mounting system to consider the large displacement in the underwater shock explosion. So it is difficult to apply the multi stage mounting system in submarine because of space limitation. Also recent navy sonar system are trying to have the capability to detect the ship-borne acoustic signals in the low frequency range. An alternative to the passive mount is an active mount with moving-coil type electromagnetic actuator based on a conventional rubber mount in the low frequency range. In the previous paper, 4 active mounts with moving-coil type electromagnetic actuator based on the rubber mount were installed on the hard floor of the facility, which means no consideration on the elastic foundation effect for the control of the active mounts was taken into account. In this study, an experimental performance analysis on the active mount was carried out using 4 active mounts installed on the cylindrical structure to investigate the elastic foundation effect.

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Design of Planar Power Divider Combiner for K-Band and Improvement of Impedence Matching Condition (K-밴드 평면형 Power Divider / Combiner와 정합특성에 관한 연구)

  • 나극환;홍의석;강준길;김춘길
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.6
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    • pp.579-589
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    • 1989
  • In this paper, planar power dividers/combiners for millimeter waves K-band or bands which can be printed on the substrates of hybrid or monolithic IC by surface mounting are designed and studied. Power dividers/combiners, and the conductor loss of microstrip lines in particualr the existing Wilkinson power dividers/combiners is modified ad amployes by ist equivalent circuit. Microwave CAD program SUPEROMPACT is employed for the Wilkinson power combiner which is modified and analyzed to reduce the high frequency coupling between the branches of the combiner, and the method to diminish the sensitivity of the input reflection of $2^n$-way power dividers/combiners is studied employing the commerical microwave CAD program package SUPERCOMPACT.

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The Quality Control Method in the Laboratory Analysis of Aquatic Ecosystem Health Monitoring and Assessment: Permanent Mounting Slides Tool Development Using Benthic Attached Diatoms. (수생태계 건강성 조사·평가를 위한 실내분석 정도관리 방법: 부착돌말류 영구표본 분석도구 개발)

  • Jae-Ki Shin;Nan-Young Kim;Yongeun Park;Kyung-Lak Lee;Baik-Ho Kim;Yong-Jae Kim;Han-Soon Kim;Jung Ho Lee;Hak Young Lee;Soon-Jin Hwang
    • Korean Journal of Ecology and Environment
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    • v.56 no.3
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    • pp.196-206
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    • 2023
  • Benthic attached diatoms (BADs), a major primary producer in lotic stream and river ecosystems are micro-sized organisms and require a highly magnified microscopic technique in the observation work. Thus, it is often not easy to ensure accuracy and precision in both qualitative and quantitative analyses. This study proposed a new technique applicable to improve quality control of aquatic ecosystem monitoring and assessment using BADs. In order to meet the purpose of quality control, we developed a permanent mounting slide technique which can be used for both qualitative and quantitative analyses simultaneously. We designed specimens with the combination of grid on both cover and slide glasses and compared their efficiency. As a result of observation and counting of BADs, the slide glass designed with the color-lined grid showed the highest efficiency compared to other test conditions. We expect that the method developed in this study could be effectively used to analyze BADs and contributed to improve the quality control in aquatic ecosystem health monitoring and assessment.

Comparison of Driving Time between Stop-motion Method and Moving-motion Method

  • Kim, Soon-Ho;Kim, Chi-Su
    • Journal of Advanced Information Technology and Convergence
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    • v.8 no.2
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    • pp.139-145
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    • 2018
  • Improvement of the speed of the gantry among equipment that mounts a chip using SMT can improve productivity. In order to improve the performance of the gantry, there are studies such as a method of increasing the speed of adsorption, the speed of the gantry by reducing the weight, and a method of facilitating the use of the gantry. But all of these are ways of improving equipment. In this paper, we propose a method to improve the speed of gantry mounting microchip. The method is to shorten the driving time of the gantry. To do this, calculate the driving time using the existing method. And we calculate the travel time using the method presented in this paper. As a result, the time calculated by the proposed method is reduced by 14%.

Dynamic Stress Analysis of Structural Connection using FRF-based Substructuring Method (구조물의 연결부에서 전달함수합성법을 이용한 동응력 해석)

  • 공태식;김찬묵;이두호;서세영
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.05a
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    • pp.1195-1201
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    • 2002
  • Researches on the FRF-based substructuring method have been mainly focused on vibratory response analysis. Present study Is concerned about the application of the method to the dynamic stress analysis of a air-conditioner compressor mounting bracket in a passenger car. This is performed by using reaction forces that can be obtained by the FRF-based substructuring method. The air-conditioner system, composed of a compressor and bracket, Is analyzed by using the FRF-based substructuring method. The experimental and numerical FRFs are combined to calculate the system responses and reaction forces at the connection point. The dynamic reaction forces plugged into the bracket FE model to compute the stresses of the bracket Dynamic strains by the present method are compared with those from strain-gage test for bracket system on shaker. The comparison shows possibility of practical usage of the method for the real problem

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Digital Image Stabilization of Robot Buoy Using the Image of Mechanism (기구 메커니즘의 영상 정보를 이용한 부표 로봇의 영상 안정화)

  • Im, Eun;Myeong, Ho-Jun;Kim, Young-Jin;Yim, Choong-Hyuk;Kim, Dong-Hwan
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.6
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    • pp.645-651
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    • 2012
  • In this paper, we propose a new method for stabilizing the image captured from a camera mounted on a buoy robot. In this study, in order to solve the problem of cumulative errors and noise produced by a general gyro sensor measuring the orientation angle of the buoy robot, we propose new method for stabilizing the image. In this method, image processing techniques are combined with a newly designed target mounting mechanism that adapts to wave fluctuations. New target extraction and angle estimation techniques are introduced, along with the new mounting mechanism used for the camera and the target, which produce a stabilized image even if the buoy robot is on fluctuating waves.

Evaluation of Ride Comfort of the Passenger Vehicle Seat on idle vibration by Virtual Seat Method (Virtual Seat Method를 이용한 승용차량 시트의 정차시 진동에 대한 승차감 평가)

  • Lee, Jae-young;Ahn, Se-jin;Jeong, Wei-bong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.04a
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    • pp.780-787
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    • 2013
  • Virtual Seat Method (VSM) is used in this study for a combined evaluation method (objective & subjective) to determine comfort value of passenger vehicle seat in terms of idle vibration. In the study, a process for applying VSM divided into two stages is established. Two kinds of seat mounting passenger vehicle and six subjects are employed to compare the comfort value obtained by VSM method and by SEAT value. As a conclusion, the results by the two methods were well consistent so that VSM is verified as a method to measure ride comfort of seat in terms of idle vibration at passenger vehicle.

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The study for effective insertion path of PCB surface mounting machine (PCB부품 자동삽입기의 효율적 삽입경로에 관한 연구)

  • 문기주;윤상섭;김상현
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2000.10a
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    • pp.141-147
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    • 2000
  • For miniaturization of electronic parts and higher productivity, part arrangement job of PCB(printed Circuit Board) has been replaced with complete automated facilities, and contribution which is concerned about this will be expanded continuously. Such part arrangement job of PCB could have lots of influences to entire productivity In this paper, effective grouping method of parts is suggested for the effective insertion path job of PCB concerning the constraints to the size of parts.

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Application of Frost Detecting Sensors in Refrigerators to Reduce Energy Consumption (냉장고 소비전력 저감을 위한 착상감지센서의 응용 연구)

  • 성창용;나승유;이희영
    • Proceedings of the IEEK Conference
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    • 2000.06e
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    • pp.147-150
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    • 2000
  • Manual and predictive defrosting method is used in current refrigerators, which have several problems in terms of energy consumption and efficiency. fuming the defrosting system on by the amount of frost remains to be an important problem which has to be improved by refrigerator manufacturers. The sensing of the amount of frost by FDS(Frost Detecting Sensor) and its proper mounting point are investigated in the paper. Also the realization of actual defrosting system through experiments of operation, energy consumption and sensing mechanism is presented.

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