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전기 유동유체를 함유하는 지능외팔보의 진동특성 및 제어 실험적 고찰
최승복,박용군,서문석,Choi, Seung-Bok,Park, Yong-Kun,Suh, Moon-Suk 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
This paper reports on a proof-of-concept experimental investigation focused on evaluating the vibration characteristics and control of smart hollow cantilever beams filled with an electro-rheological(ER) fluid. The beams are considered to be of uniform viscoelastic materials and modelled as a viscously-damped harmonic oscillator. Electric field-dependent natural frequencies, loss factors and complex moduli are evaluated and compared among three different beams : two types of different volume fraction of ER fluid and one type of different particle concentration of ER fluid by weight. Modal characteristics of the beams are observed in both the absence and the presence of electric potentials. It is also shown that by constructing active control algorithm the removal of structural resonances and the suppression of tip deflection are obtained. This result provides the feasiblility of ER fluids as an active vibration control element.
이산시간 퍼지-슬라이딩모드를 이용한 스마트구조물의 강건진동제어
최승복,김명석,Choi, Seung-Bok,Kim, Myoung-Suk 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
This paper presents a new discrete-time fuzzy-sliding mode controller for robust vibration control of a smart structure featuring a piezofilm actuator. A governong equation of motion for the smart beam structure is derived and discrete-time codel with mismatched uncertainties such as parameter variations is constructed ina state space. A discrete-time sliding mode control system consisting of an equivalent controller and a discontinuous controller is formulated. In the design of the equivalent part, so called an equivalent controller separation method is adopted to achieve vzster convergence to a sliding surface without extension of a sliding region, in which the system robustness maynot be guaranteed. On the other hand, the discontinuous part is constructed on the basis of both the sliding and the convergence conditions using a time-varying feedback gain. The sliding moide controller is then incorporated with a fuzzy technique to appropriately determine principal control parameters such as a discountinuous feedback gain. Experimental implementation on the forced and random vibraiton controls is undertaken in order to demonstrate superior control performance of the proposed controller.
최승복,이상준,이승훈,최돈묵,Choi, S.B.,Lee, S.J.,Lee, S.H.,Choi, D.M. 한국화재조사학회 2008 한국화재조사학회 논문지 Vol.11 No.1
국보 1호인 숭례문 화재는 화재조사자뿐만 아니라 국민들에게 크나큰 아픔을 안겨 주었다. 이 연구의 목적은 현장조사를 통하여 목조 문화재 화재 시 생성되는 연소패턴과 목재 마루바닥에 인화성 물질을 살포 후 착화하였을 때 나타나는 촉진제에 의한 연소 흔적 등을 확인하는데 있다. 또한 이 연구결과는 유사한 화재 발생 시 화재조사요원에게 정확한 화재 원인을 감식할 수 있는 자료가 될 것이다. The fire of Sungnyemun, National Treasure of No.1, gave to the Korean people and fire investigators big pains. The aim of this study are the identification of combustion traces and fire patterns of wooden building fire, burned with an accelerator, after spraying flammable materials on the wooden floor through the field study observation. Also, in the case of the similar fire, these results will be as good references to fire investigators for accurate investigations.
최승복,Choi, S.B. 한국화재조사학회 2008 한국화재조사학회 논문지 Vol.11 No.1
실제로 발생한 화재사건 현장에 대하여 발화부를 확정하고 발화부내에서 발화원인으로 작용한 전기기기 및 제품을 분해하여 객관적인 입증을 도출하였다. 그리고 이와 유사한 사례를 예로 들어 보았다. 실제 산업현장에서 사용되고 있는 전기제품들의 취급 실태 지적하고 개선하여야 할 점과 대책을 검토함으로써 이러한 사례들과 유사한 유형의 화재의 재발을 방지할 수 있도록 기초자료를 제시하였다. We identified objectively the ignition spot of real fire scene and electrical machinery and appliances in sections which were acted for fire cause. By pointing out the actual condition of dealing electronic devices and researching the way of solution, I will presents the fundamental materials which will help to prevent recurrence.
최승복(Choi, Seung-Bok),오부열(Oh, Bu-Yeol),최돈묵(Choi, Don-Mook) 한국화재소방학회 2011 한국화재소방학회 학술대회 논문집 Vol.2011 No.추계
심하게 소손된 화재현장은 남아 있는 잔존물만으로 초기 화재의 유형을 판단하기 곤란할 때가 많다. 화재로 인해 사람이 사망하였을 경우 혈중 일산화탄소-헤모글로빈 농도는 생존 당시의 화재의 유형을 가늠할 수 있으며 촉진제를 사용한 급격한 화재의 경우 열기와 유독가스로 인해 재실자의 생존은 화재진행속도와 비례되어 체내 헤모글로빈 일산화탄소 농도는 낮았으며, 훈소와 같이 서서히 진행되는 연소의 경우 오랜 시간 호흡하면서 체내에 축적되는 일산화탄소 농도는 증가하였다. 이러한 인체의 헤모글로빈-일산화탄소 농도를 분석하면 생존 시 어떠한 형태의 화재에 노출되었는지 알 수 있었다. Fire patterns have been used to determine the origin and cause of fires in every setting imaginable. However, it is very difficult to identify fire patterns from the fire-damaged remains of a devastated structure. If someone was killed by the fire, it is possible to identify fire patterns by analyzing the concentration of carbon monoxide-hemoglobin in the body of deceased as well as the pace of the fire. For example, a low level of carbon monoxide-hemoglobin in the body of the dead indicates a rapid fire with accelerants and the death was caused by severe heat and thick toxic fumes. However, a high level of carbon monoxide-hemoglobin in the body of the dead demonstrates that the fire was slow and/or there was a flameless form of combustion. Thus, this study identifies fire patterns through analyzing the level of carbon monoxide-hemoglobin concentration on the dead from the fire.