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오리피스 유량계의 입구 속도 분포에 따른 유량 계측 왜곡 특성
신병수(B. S. Shin),김남석(N. S. Kim),이상규(S. K. Lee),배용범,금오현(O. H. Keum) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this numerical analysis, the distortion of flow measurement by inlet velocity profile of orifice flowmeter was investigated. To validate the numerical method, the convergence was monitored and the grid dependency was also checked. realizable κ-e model was selected and y+ was about 50 in this calculation. the results shows that the pressure at the pressure tab near pipe wall was changed by inclined inlet velocity profile and it leads to distorted a measurement values of flow through the orifice plate from -3.8% to 9%. Therefore, the fully developed inlet flow was required for accurate flow measurement by orifice flowmeter. If not, the orifice plate installed at wrong location should be re-installed or additional actions should be taken.
조절링의 위치에 따른 안전밸브의 동적거동에 대한 전산해석
신병수(B.S. Shin),장원준(W.J. Chang),도규식(K.S. Do) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
This paper presents a study of dynamic characteristics of safety valve on the position of adjust ring from the CFD analysis on 2D simplified modeling using CFX code. The major concerns in this study are comparisons of flow field and closing pressure of safety valve on the position of adjust ring. And the closing pressure of asymmetric adjust ring was also estimated. To simulate specific fluid characteristics such as sudden expansion and contraction, the working fluid is compressible steam using real gas model. And to simulate the dynamic behavior of valve disc, the force balance equation was applied to the analysis using CEL expression. As a result, it is conformed that the dynamic characteristics between the position of adjust ring and the closing pressure coincided with the valve original design and the closing pressure of asymmetric adjust ring was different from original value.
ADAMS를 이용한 리튬전지 고속 자동 블리스터 포장기의 가상시제품 개발
정상화,이경형,차경래,송석,최석환,신병수 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.2
The blister packaging is applied t o many fields in recent years for i t s merit t h a t it enable consumer t o see t h e products The most of battery packaging a r e blister type. However, t h e lithium battery is dealt with very carefully i n packaging because of i t s explosion. The existing packaging machines for lithium battery are mostly adapted alkaline packaging machine and their capacity is very inferior to okher process. either. In this paper, the virtual prototype of the automatic blister packaging system for lithium battery which has new mechanism and 24OEAjmin capacity ' is developed and its performance is evaluated.
초음파 이송 시스템 개발을 위한 Flexural Beam의 진동특성에 관한 실험적 연구
정상화,신병수 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.2
In the semiconductor and the optical industry a new transport system which can replace the conventional sliding system is required These systems are driven by magnetic field and conveyer belt The magnetic field damages semiconductor and contact force scratches the optical lens The ultrasonic wave driven system can solve these problem. In this paper, the vibration behavior of flexural beam in the ultrasonic transport system is verified using Laser Scanning Vibrorneter. The experiments for verifying vibration are performed in three conditions such' as in the maximum transport speed, in the zero speed, and in the change of transport direction.
정상화,신병수 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.2
In the semiconductor and the optical industry a new transport system which can replace the conventional sliding system is required. These systems are driven by magnetic field and conveyer belt. The magnetic field damages semiconductor and contact force scratches the optical lens. The ultrasonic wave driven system can solve these problem. In this paper, the object transport system using the excitation of ultrasonic wave is proposed. The experiments for finding the optimal excitation frequency, finding phase-difference between two ultrasonic wave generators are. performed. The relationship of transporting speed according to the change of flexural beam shape is verified and the system performance for practical use is evaluated.