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김양수(Kim Yangsu),장우진(Jang Woojin) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Because on the high-tension underground distribution line of an electric railway high voltage XLPE Cable two or three circuits between railway stations with a standard as receiving transformer facilities are established at a 30㎞~50㎞ interval, reactive power in which the phase of a current is larger than that of a voltage is supplied when trains are not working, so when there are no loading or low loading as night. Due to the long-distance trend of the underground distribution system on an alternating current railway distribution line, the terminal voltage of a transformer is over the standard voltage, and after all, commercial cycle overvoltage is continued. To solve this problem, the shunt reactor is installed in middle of power distribution lines to maintain receiver voltage meted under the allowance regulation through control of the reactive power. Also, in case that the thickness of single cable is over 60㎟ and length of line is about over 30km, a circuit breaker is broken by shorting shunt ability of charging current in excess of shunt current(31.5A.rms). Therefore, this thesis presents installing the location of shunt reactor for quantitative analysis by using optimum algorism for compensation and control of the charging current.
Frequency And Time Domain Characteristics Analysis Of Hydraulic Bushing
Nguyen Van Quyet,Yeongman Kim(김영만),Yangsu Kim(김양수),Seongbum Lee(이성범),Heungseob Kim(김흥섭) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently the hydraulic bushings in suspension and sub-frame system of a rear-wheel driving vehicle are adapted to improve ride quality and reduce noise and vibration. The dynamic stiffness and damping properties of these hydraulic bushings are highly dependent on the amplitude and frequency of excitation force as well as the static load, but analytical case studies about such dynamic responses are not enough. The dynamic stiffness and loss angle of a hydraulic bushing are a crucial purpose functions and it is significant to investigate the relation between the design parameter of internal structure and these functions. During the design stage of a hydraulic bushing with one fluid element, it is not easy to adjust the maximum frequency of loss angle to specific frequency of the most disruptive excitations due to geometry limitations of the fluid track. In this study, the design factors such as fluid flow passage, internal chamber are selected to affect the dynamic characteristics of hydraulic bushing. And the analytical study is implemented in several hydraulic bushing configurations with different combination of design factors. The formulation with lumped parameter model about hydraulic bushing configurations is implemented and the variation of dynamic stiffness and loss angle is examined with MATLAB simulation in time and frequency domain. Finally the feasible and practical modeling method of hydraulic bushing will be proposed.
김양수 한국철도대학 2008 한국철도대학논문집 Vol.23 No.-
Currently, big-city subway line that plays a critical role as public transportation, and in metropolitan cities, including small and medium-sized cities in eager to Lightweight electric railway as a pillar of public transportation, and construction planning or construction, the development of public transport In addition to the city and the city's rapid population growth, based on Facilities city gas pipeline, pipeline, including a constant conduit to the underground explosion is increasing the a metal tube. Most of these facilities close to the subway tracks along with the inevitable underground the city, railway (subway), the tracks that are drawn from the leakage current (Stray Current) is due to an Illuminations, Most of these facilities close to the subway tracks along with the inevitable laying the city, railway (subway), the tracks that are drawn from the leakage current (Stray Current) is due to an Illuminations, an underground pipe line management in order to avoid the subject every Illuminations prevention facilities (Current state law to send the device) are installed and operated, but because it is expected to raise another issue Illuminations prevention facilities (Current state law to send the device) operation is expected to consider the issue of the appropriate measures proposed.
구조물 및 기기 지진취약도 평가를 위한 주요 설계변수의 분산도 영향 연구
김석철 ( Kim Seok-chul ),권양수 ( Kwon Yangsu ),주광호 ( Joo Kwang-ho ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
지진 발생시 원자력 발전소의 안전성을 평가하기 위해 수행되는 확률론적 지진 안전성평가를 위해서는 원전의 기기별로 지진 수준에 따른 파괴확률로서 표현되는 지진취약도 평가가 필요하다. 지진취약도 평가를 위해서는 대상 기기의 설계정보와 함께 실제 설치 상태에 대한 현장조사 등을 통해 예상되는 파손모드를 결정이 필요하며 주요 변수에 대한 불확실성 및 임의성 등 변동성 요인을 반영하여 결정된다. 본 연구에서는 구조적 파손이 지배하는 경우에 대하여 각 변수별로 변동성 요인을 도출하고 분산도 반영에 따른 지진취약도 영향 요인을 분석하고자 한다.
방사선투과시험에 의한 망이산성 횡장판갑의 제작기법 연구
김현정,김미도리,오광섭,이양수,조남철 국립중앙박물관 2006 박물관보존과학 Vol.7 No.-
판갑은 고대의 무기와 철제품 제작기술을 그대로 반영하는 중요한 문화재이다. 철제갑옷 중 횡장판갑의 출토사례는 매우 드물며 망이산성 출토 판갑처럼 그 형태가 완형인 유물은 그리 많지 않다. 이번 보고서에서는 응용 가능한 비파괴방사선 조사에 의한 횡장판갑의 방사선사진 및 과학적 보존처리를 통하여 나타나는 고대 판갑제작기술을 검토해 보았다. 7단구성의 망이산성 출토 판갑은 고리경첩으로 우전동이 개폐되는 형식이다. X-선 사진의 판독결과 판겹침과 천공간격으로 고대판의 철포복륜 및 우측협부의 혁포복륜이 확인되었으며, 착장시 어깨걸이를 연결한 것으로 보이는 투공도 관찰되었다. 특히 천공과 병뉴기법에 있어, 하나의 병이 세판 이상을 연접하는 것을 피하고 있음을 확인하였다. 이는 기술적인 한계를 극복하고 판갑의 기능을 살렸음을 보여주는 중요한 자료이다. Plate armour is an important cultural property that reflects the ancient weaponry and the manufacturing technology of ironware as they are. Among the kinds of iron armour, horizontal plate armour has been very rarely excavated, and there are a few artifacts in their unimpaired shape like the plate armour excavated from Mangisanseong. This report reviews the manufacturing technology of ancient plate armour through its radiograph using appliable nondestructive irradiation and scientific conservation treatment. The seven-tiered plate armour excavated from Mangisanseong has ring hinge to open and shut the right side neck guard. The readout result of radiograph proved iron safety guard of Godaepan (a plate that links neck plate and horizontal plate) and leather safety guard of the right armpit with plate overlap and perforation interval; perforations that seem to have linked shoulder strap on wearing the armour are also observed. In particular, it is identified that the perforation and riveting technique avoided the connection of more than three plates with a rivet. This is an important material to illustrate the best use of function of plate armour overcoming its limit.
원전기기 상세 내진해석 모델 구성을 위한 앵커 연결부 변수 도출
권양수 ( Kwon Yangsu ),김석철 ( Kim Seok-chul ),주광호 ( Joo Kwang-ho ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
Most of systems and components in nuclear power plants (NPPs) are anchored to the concrete structure and other components by means of post installed anchors. In order to develop more accurate seismic analysis model of equipment in NPPs, a deep consideration of concrete-anchor connection behavior is required. In this paper, the nonlinear finite element analysis was conducted for the concrete-anchor connection zone details. From the analysis results including strength and load-displacement relation was derived according to design variables including geometry and material properties.