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이중 충격 발생 기능을 갖는 대형 고중량 충격시험장치의 동력학적 설계
강민식(M. S. Kang),설창원(C. W. Shul),김태형(T. H. Kim),양명석(M. S. Yang),송원길(W. G. Song),이규섭(G. S. Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Naval shipboard components encounter mechanical shock from a variety of sources. Components must be designed and tested accordingly to ensure reliability under possible shock pulses. This study concerns on dynamic design of a large and heavy dual shock generation system that will be used for reliability test of naval shipboard components. This is required to generate specific shock time history. Especially, the desired shock consists of a very high amplitude and very short period half-sine shock followed by an exponentially decaying harmonic shock of relatively longer period. Base on analysis of the dynamic characteristics of the given shock history, we proposed a sequential design procedure to determine spring and damping coefficients of the generation system. Feasibility of the proposed method was verified along with some simulation results.
충돌 속도에 따른 실리콘 충격 프로그래머의 유효 탄성 계수 예측에 관한 연구
양태호 ( T H Yang ),이영신 ( Y S Lee ),김윤재 ( Y J Kim ),김태형 ( T H Kim ),설창원 ( C W Shul ),양명석 ( M S Yang ),안채헌 ( C H An ),이규섭 ( G S Lee ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.1
The silicon as the hyper-elastic material was used to design the shock programmer and dynamic characteristic of the shock programmer was studied. The shock programmer was a structure part that was mounted between the impactor and the test bed. The role of the shock programmer was to generate the acceleration time history by the objective of various impact tests. The effective elastic modulus of the silicon was varied under the velocity of the impactor. The effective elastic modulus of the silicon was estimated by the comparison with results between test and simulation
MR 댐퍼를 이용한 이중파형 충격가속도 재현을 위한 충격시험기 설계해석
이규섭(G.S.Lee),구형욱(H.W.Koo),설창원(C.W.Shul),김태형(T.H. Kim),양명석(M.S. Yang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The main shape of impulsive acceleration by the undersea explosion is composed of the positive and negative half sine shaped acceleration, so called the double shape impulsive acceleration. Generally, the first positive acceleration has the higher peak and shorter period and the second negative acceleration has the lower peak and longer period. The impact test equipment should be able to reconstruct the shape of the acceleration in order to estimate the safety and stability of the equipments installed in the ship. The design goal is to make simplify the complex structure due to the various shapes of the impulsive acceleration by using the controllable damping force of MR damper.
자기유변유체 댐퍼를 이용한 충격파형 모사의 실험적 평가
김환충(H. C. Kim),오종석(J. S. Oh),최승복(S. B. Choi),설창원(C. W. Shul),김태형(T. H. Kim),양명석(M. S. Yang),이규섭(G. S. Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This research presents an active tuning shock wave using a magnetorheological fluid damper (MR damper in short) under condition of high impact. To realize shock wave depending on current levels, a new large size of MR damper is designed and manufactured to produce a 100kN maximum damping force. A performance evaluation of the MR damper is conducted in sinusoidal condition. After evaluating damping force depending on current levels, a shock tester is introduced. The MR damper is located between a mass and the end of the shock tester. To investigate characteristics of tuning shock wave profile and the MR damper in high impact, several experimental conditions are established. During impact experiments, the shock wave of the mass and damping force of the MR damper are measured by accelerometers and a load cell. As a results, dynamic behaviors of the MR damper is evaluated and its shock wave tuning ability is demonstrated by changing the magnetic intensity.
KRISTAL-2002를 위한 JAVA 사용자 API의 설계 및 구현
주원균(Wonkyun Joo),정창후(C.H. Jeong),이민호(M.H. Lee),양명석(M.S. Yang),최윤수(Y.S. Choi),최기석(K.S. Choi) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅲ
본 논문에서는 트랜젝션 기반의 정형/비정형/XML 데이터 관리 및 검색 기능을 갖춘 정보 관리 시스템 KRISTAL-2002를 대상으로 하여, JAVA를 구현언어로 사용하는 개발자가 해당 시스템의 기능을 원활하게 사용할 수 있도록 하기 위한 KRISTAL-2002 사용자 프로토콜 및 JAVA 기반의 API 설계를 목표로 한다. KRISTAL-2002 프로토콜은 TCP/IP 기반 XML 메시징 프로토콜에 기반을 둔 것으로서, 클라이언트와 서버 모두에서 처리 효율을 높일 수 있다. 이러한 프로토콜을 기반으로 3개 그룹에 걸쳐 총 24 개의 KRISTAL-2002 JAVA API를 설계/구현하였다.
설창원(C.W. Shul),김태형(T.H. Kim),양명석(M.S. Yang),이규섭(G.S. Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this paper, the conceptual study results for the development of the horizontal type large scale heavy weight shock testing machine(HLHSTM) to evaluate shock survivability of the heavy weight equipments of the shipboard weapon systems under the UNDEX shock environments are described. Several shock test specifications about shock survivability evaluation under UNDEX are considered to decide the development requirement of HLHSTM. According to the results of the developed feasibility study to develop core technologies for the heavy weight shock testing machine to simulate dual pulse shock, the HLHSTM by using high force/speed MR damper systems is suggested. The modified pulse regulator systems by using high force pneumatic spring actuator and the modified MR damper are studied to simulate precisely the negative pulse of the dual sine pulse and adjust residual vibration. In this paper, we performed a conceptual study to develop HLHSTM. The validity of the developed design concepts were confirmed through the analysis and validity check tests by using the small scale prototype testing machine.
고중량 충격시험장치의 요구신호 구현 방법의 해석적 검증
김태형(T. H. Kim),설창원(C. W. Shul),양명석(M. S. Yang),이규섭(G. S. Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The characteristics of dual pulse shock caused by under water shock are described in the standard such as BV043 and the signals that required in the shock test machine to evaluate the survivability of equipment are also described. Heavy weight shock test machine is required to generate the required shock signal to test heavy weight devices installed in surface ships or submarines. Each parts of the machine such as spring, damper also should have high payload. But each part has limited performance due to design or manufacturing issue. This limited condition makes the shock test machine hange the characteristics of each part or test mechanism to generate various shock signal. This paper presents the analytic method which determines the characteristics of heavy weight shock test machine to generate required shock signal and also shows the results of investigation on the test mechanism to generate various shock signal.