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- 주제어 : Mechanical indicator (검색결과 16 건)
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백민호(Min-Ho Baek),홍훈빈(Hoon-Bin Hong),박희준(Hee-June Park) 대한전기학회 2016 전기학회논문지 Vol.65 No.11
Control Rod Position Indicator in nuclear reactor vessel has developed for small reactor in Korea. Because of severe environment in reactor vessel, target of this study is to develop the suitable position indicator. In this study, solenoid type position indicator made of Mineral Insulated Cable(MI Cable) was introduced to adapt in severe environment. And inductance of the solenoid was used to indicate the rod position for high precision. But problem of this concept is that a linear slope of inductance is changed by temperature effect. To resolve this problem, two sensing coils were introduced for temperature compensation. A role of the sensing coil is to make reference linear equation about certain temperature. To confirm this concept, also, inductance of solenoid and sensing coils were measured at room and high temperature (~300℃). The results of measurement show that the position error of sensing coil between room and high temperature was about 2%. But it was identified that this error was resulted from insufficient test environment (temperature error between solenoid and sensing coils was about 2% at high temperature condition). Therefore, solenoid type position indicator shows that it is very suitable in reactor vessel as a high precision rod position indicator.
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정균식(Kyun-Sik Jung),이진욱(Jin-Uk Lee),정진아(Jin-Ah Jung),최재성(Jae-Sung Choi) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
Recently, EMS(Engine Monitoring System) is reported that the IHP calculated and measured from electronic indicator has a deviation compared to mechanical indicator. The same results has been shown in case of trainingship HANNARA, so it is required to analysis about the estimation of engine output. In this paper it is studied on the cause of error for engine performance analysis and investigated the reliability of engine output by the acquisition methods of cylinder pressure data.
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Accuracy of structural computation on simplified shape
Marin, P. Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.2
This paper focuses on a number of criteria that enable controlling the influence of geometric simplification on the quality of finite element (FE) computations. To perform the mechanical simulation of a component, the corresponding geometric model typically needs to be simplified in accordance with hypotheses adopted regarding the component's mechanical behaviour. The method presented herein serves to compute an a posteriori indicator for the purpose of estimating the significance of each feature removal. This method can be used as part of an adaptive process of geometric simplification. If a shape detail removed during the shape simplification process proves to be influential on mechanical behaviour, the particular detail can then be reinserted into the simplified model, thus making it possible to readapt the initial simulation model. The fields of application for such a method are: static problems involving linear elastic behaviour, and linear thermal problems with stationary conduction.
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Research on the Monitoring and Warning Mechanism about Operation of Funds in Universities of China
Zhai Huayun,Zheng Jun 한국경영교육학회 2011 한국경영교육학회 학술발표대회논문집 Vol.2011 No.12
Based on domestic and international early warning indicator system of funds security of universities, it is established the evaluation indicator system of funds security of universities in China from the micro level and the meso level of social, political and economic environments, and it is established the monitoring and warning mechanism about operation of funds in universities of China. Finally, it is analyzed the status of operation of funds in universities of China.
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Accuracy of structural computation on simplified shape
P. Marin 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.2
This paper focuses on a number of criteria that enable controlling the influence of geometric simplification on the quality of finite element (FE) computations. To perform the mechanical simulation of a component, the corresponding geometric model typically needs to be simplified in accordance with hypotheses adopted regarding the component’s mechanical behaviour. The method presented herein serves to compute an a posteriori indicator for the purpose of estimating the significance of each feature removal. This method can be used as part of an adaptive process of geometric simplification. If a shape detail removed during the shape simplification process proves to be influential on mechanical behaviour, the particular detail can then be reinserted into the simplified model, thus making it possible to readapt the initial simulation model. The fields of application for such a method are: static problems involving linear elastic behaviour, and linear thermal problems with stationary conduction.
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Jun-Feng Zhang,Yao-Jun Ge,Lin Zhao 한국풍공학회 2013 Wind and Structures, An International Journal (WAS Vol.16 No.6
Interference effects are of considerable concern for group hyperboloidal cooling towers, but evaluation methods and results are different from each other because of the insufficient understanding on the structure behavior. Therefore, the mechanical performance of hyperboloidal cooling tower shell under wind loads was illustrated according to some basic properties drawn from horizontal rings and cantilever beams. The hyperboloidal cooling tower shell can be regarded as the coupling of horizontal rings and meridian cantilever beams, and this perception is beneficial for understanding the mechanical performance under wind loads. Afterwards, the mean external latitude wind pressure distribution, CP(θ), was artificially adjusted to pursue the relationship between different CP(θ) and wind-induced responses. It was found that the maximum responses in hyperboloidal cooling tower shell are primarily dominated by the non-uniformity of CP(θ) but not the local pressure amplitude CP or overall resistance/drag coefficient CD. In all the internal forces, the maximum amplitude of meridian axial tension shows remarkable sensitivity to the variation of CP(θ) and it’s also the controlling force in structure design, so it was selected as an indicator to evaluate the influence of CP(θ) on responses. Based on its sensitivity to different adjustment parameters of CP(θ), an comprehensive response influence factor, RIF, was deduced to assess the meridian axial tension for arbitrary CP(θ).
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Zhang, Jun-Feng,Ge, Yao-Jun,Zhao, Lin Techno-Press 2013 Wind and Structures, An International Journal (WAS Vol.16 No.6
Interference effects are of considerable concern for group hyperboloidal cooling towers, but evaluation methods and results are different from each other because of the insufficient understanding on the structure behavior. Therefore, the mechanical performance of hyperboloidal cooling tower shell under wind loads was illustrated according to some basic properties drawn from horizontal rings and cantilever beams. The hyperboloidal cooling tower shell can be regarded as the coupling of horizontal rings and meridian cantilever beams, and this perception is beneficial for understanding the mechanical performance under wind loads. Afterwards, the mean external latitude wind pressure distribution, CP(${\theta}$), was artificially adjusted to pursue the relationship between different CP(${\theta}$) and wind-induced responses. It was found that the maximum responses in hyperboloidal cooling tower shell are primarily dominated by the non-uniformity of CP(${\theta}$) but not the local pressure amplitude CP or overall resistance/drag coefficient CD. In all the internal forces, the maximum amplitude of meridian axial tension shows remarkable sensitivity to the variation of CP(${\theta}$) and it's also the controlling force in structure design, so it was selected as an indicator to evaluate the influence of CP(${\theta}$) on responses. Based on its sensitivity to different adjustment parameters of CP(${\theta}$), an comprehensive response influence factor, RIF, was deduced to assess the meridian axial tension for arbitrary CP(${\theta}$).
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A computational study of DME-methanol fractions with controlling several factors on HCCI combustion
Hyowon Lee,임옥택 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
Two-stage fuel and single stage fuel have different effects on ignition delay and other combustion characteristics. If we mix two fuels with variable fractions, combustion characteristics will be represented with dependence on the fraction. We first investigated the change of combustion characteristics and combustion ranges by dimethyl ether (DME)/methanol fraction, IVC temperature and IVC pressure. By increasing methanol fraction, Heat release rate (HRR) showed higher rate than the case containing less methanol after 1250 K. However, it didn't mean that Accumulated heat release (AHR) was also higher than the cases which contained less methanol. AHR of D90/M10 was the first case which surpassed AHR of D100 at about 1808K, and D80/M20 surpassed D100 at about 2318K. The result was caused by change of reaction mechanism and the change was remarkably shown in the Thermal ignition preparation (TIP) range and the Thermal ignition (TI) range. Above all, strengthened H 2 O 2 Loop reactions affected heat production to increase in TIP range, and also one of the loop reactions, CH 2 O + OH = HCO + H 2 O, quickly produced formyl radical with increase of net reaction rate by methanol. Those results naturally led to higher reaction rates of HCO-CO-CO 2 oxidation with higher heat production. As a result, D50/M50 case showed the highest maximum Pressure rise rate (PRR). Furthermore, dispersion rate of PRR was increased by increasing methanol fraction in the range which was from back end of TIP to forepart of TI range. Finally, we focused the reaction paths of two fuels and the production and consumption rate of main radicals on the basis of combustion ranges such as LTO, Negative temperature coefficient (NTC), Thermal ignition preparation (TIP) and Thermal ignition (TI) to understand the results of this study.
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