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김상헌,김경호,선종오,조영갑,정택형,김정현,이관희,Kim, Sanghaun,Kim, Gyeong-Ho,Sun, Jong-Oh,Cho, Yeong-Garp,Jung, Taeck-Hyung,Kim, Jung-Hyun,Lee, Kwan-Hee 한국압력기기공학회 2016 한국압력기기공학회 논문집 Vol.12 No.1
The Second Shutdown Drive Mechanism (SSDM) provides an alternate and independent means of reactor shutdown. The Second Shutdown Rods (SSRs) of SSDMs are poised at the top of the core by the hydraulic force driven from a hydraulic system during normal operation. The rods drop by gravity when a trip is commended by a Reactor Protection System, Alternate Protection System, Automatic Seismic Trip System or operator by means of power off solenoid valves of hydraulic system. This paper describes the test results of seismic qualification of a prototype SSDM hydraulic system to demonstrate that its structural integrity and operability (functionality) are maintained during and after seismic excitations, that is, an adequacy of the SSDM design. From the results, this paper shows that the SSDM hydraulic system satisfies all its design requirements without any malfunctions during and after seismic excitations.
김상헌(Sanghaun Kim),김경호(Gyeong-Ho Kim),선종오(Jongoh Sun),조영갑(Yeong-Garp Cho),김정현(Jung-Hyun Kim),정택형(Taeck-Hyung Jung),이관희(Kwan-Hee Lee) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
The reactivity control mechanisms of Jordan Research and Training Reactor (JRTR) with 5MW power (10MW upgradable) with plate type fuels, which has been designed and fabricated through KAERI and DAEWOO consortium project, consist of four Control Rod Drive Mechanisms (CRDMs) driven by an individual step motor and two Second Shutdown Drive Mechanisms (SSDMs) driven by an individual hydraulic system. The SSDM provides an alternate and independent means of reactor shutdown. The Second Shutdown Rods (SSRs) in SSDMs are poised at the top of the core by the hydraulic force during normal operation. The rods drop by gravity when a trip is commended by a Reactor Protection System. This paper describes the qualification test results of seismic structural integrity and drop performance of a prototype SSDM to verify that the structural integrity and operability (functionality) of SSDM are maintained during and after seismic excitations, that is, an adequacy of the SSDM design. From the results, this paper shows that the SSDM satisfies all design requirements without any malfunctions during and after seismic excitations.
연구용 원자로 내부에 설치되는 이차정지구동장치의 내진낙하성능
김상헌(Sanghaun Kim),김경호(Gyeong-Ho Kim),선종오(Jongoh Sun),조영갑(Yeong-Garp Cho),김정현(Jung-Hyun Kim),정택형(Taeck-Hyung Jung),이관희(Kwan-Hee Lee) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.6
The second shutdown drive mechanism (SSDM) that is classified into seismic category I as an active mechanical equipment shall maintain the structural integrity and its designed inherent safety functions during and/or after normal operation, anticipated operational occurrences, accidents and seismic occurrences. Therefore, not only a structural integrity assessment through numerical analyses but also a qualification test by using the prototype SSDM shall be conducted to verify the adequacy of the SSDM design. This paper describes a sort of seismic qualification test of the prototype SSDM to demonstrate that the structural integrity and operability (functionality) of SSDM are maintained during and/or after seismic excitations. From the results, this paper shows that the SSDM satisfies all design requirements without any malfunctions during and after the seismic test.
김상헌(Sanghaun Kim),조맹효(Maenghyo Cho),김철(Cheol Kim) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.2
잔류응력 하에서 양방향 형상기억효과를 이용하면 온도를 올리거나 내림에 의해서 피구동 구조물이 최초의 형상으로 되돌아간다. 본 연구에서 형상기억합금(SMA)의 열-기계적 구성방정식을 이용하여 잔류응력 하에 놓인 두개의 형상기억합금 선을 이용한 구조물의 형상변형에 관한 수치해석을 수행하였다. 본 연구에서 수행된 수치 시뮬레이션 결과를 통해 엑추에이터 장치는 효과적인 반복구동에 적합함을 알 수 있었다. 본 연구에 사용된 해석방법은 보다 다양하고 실제적인 SMA 작동기의 해석에 확장 적용될 수 있다. A structure using the two-way shape memory effect(TWSME) returns to its initial shape by increasing or decreasing temperature under an initially residual stress. Through the thermo-mechanical constitutive equation of shape memory alloy(SMA) proposed by Lagoudas et αl., we simulated the structure with two SMA wires attached at the tip under the initially given residual stress. Through the numerical results conducted in the present study, the actuator device was suitable for repeated actuation efficiently. The simulation algorithm which proposed in the present study can be applied extensively to the analysis of the SMA-actuators in practical applications.
하중 트레이닝을 통한 형상기억합금의 특성 실험과 거동 전산 모사
김상헌(Sanghaun Kim),조맹효(Maenghyo Cho) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this study, we observe the application of shape memory alloy(SMA) into smart structures for repeatable actuation, because SMA changes its material properties and characteristics progressively under cyclic loading conditions and finally reaches stable path(state) after a certain number of stress/temperature loadingunloading cycles, so called 'training'. In this paper, SMA wires that have been in a stable state through the training are used. Stress-strain curve of the SMA wire at different temperature levels are measured. In addition, we observe other important effects such as the rate effect according to strain rates for rapid actuation response. The current work presents the experimental test using SMA wire after training completion by mechanical cycling. Through these tests, we measure the characteristics of SMA. With the estimated SMA properties and effects, we compare the experimental results with the simulation results based on the SMA constitutive equations.
형상기억합금 트러스 구조물을 이용한 스텐트의 설계 및 해석
양성필(Seongpil Yang),김상헌(Sanghaun Kim),조맹효(Manghyo Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Recently, many patients related to heart disease have surgical operation by expanding a blood vessel to treat the angiostenosis. So far most angioplasties have been performed using balloon-dilative stent made of stainless steel. Some researchers are studying the stent made of shape memory alloy (SMA) to operate the angioplasty more easily. and there are several papers which introduce the angioplasty using SMA. However, most of the analysis models for stents are constructed using solid elements. So much computing time is required to solve the analysis model. In this study, we suggest the SMA stent model using 1D truss element which is much faster than stent model using 3D solid element. To represent non-linear behavior of SMA, we apply 1D SMA constitutive equation of Lagoudas’. Pseudo-elastic behavior of stent structures is presented as a numerical example.
형상기억합금 수치해석을 위한 특성 실험 및 작동기 응용
최현호(Hyunho Choi),김상헌(Sanghaun Kim),조맹효(Maenghyo Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Adaptation of two-way shape memory effect of SMA wire to the actuator is examined. Therefore the SMA characteristics which are training, material properties, response time at different thermal cycling rates are tested. During training, permanent deformation is accumulated till a certain number of cycle and then saturated. The amount of two-way strain is unchangeable over all cycle and the slope of strain(or stress)-temperature curve is slower as the increase of applied stress. The rate effect is observed resulted from the thermal distribution which heating profile differs from cooling as thermal cycling time. In addition, using the estimated SMA properties, an experimental test for the simple smart wing is performed.