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Preventing Loose Bolts and Reducing the Number of Bolts Required in Plate Heat Exchangers
Ta-Kwan Woo,Beom-Cheol Hwang,Young Jun Jang,Chul Kim 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.1
There are many methods for assembling various parts of a product. Bolts are widely used because they easily hold components tightly together and are simple to install and remove. However, bolts require other components to prevent loosening, which increases their cost. This study proposes equations that explain why bolts become loose and solves them using finite element analysis. Furthermore, because the number of bolts used in attaching components is often based on the empirical experience of designers in the field, the safety margin in plate heat exchangers is often too high. The equations presented in this study permit the number of bolts to be reduced. These equations take into consideration the relationship between the critical shear force acting on the screw and the normal force acting on the cooling plate induced by the working fluid.
송명준(Myung-Jun Song),우타관(Ta-Kwan Woo),정성윤(Sung-Yuen Jung),허관도(Kwan-Do Hur),김철(Chul kim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.1
With the latest automobile technology, though the third generation common rail system requires high injection pressures up to 1,800bar, the next generation diesel engine is expected to require more higher pressures than the third generation. The common rail pipe requires higher strength because it is one of the parts in the common rail system, which is influenced directly by fuel under high pressure. Preform design is very important for preventing head of the common rail pipe from folding in the heading process. In this study, die angle, curvature, outer diameter of die and length of trapped part are selected as main parameters to obtain best preform shape minimizing radius of folding. Therefore optimal design is carried out by finite element analysis and Taguchi method through main parameters. Results of the finite element analysis have good agreements with those of the experiments in the actual field.
In-line 타입 해저 세퍼레이터 내부 기-액 유동 연구
김영주(Yong-Ju Kim),우남섭(Nam-Sub Woo),전홍필(Hong-Pil Jeon),한상목(Sang-Mok Han),우타관(Ta-Kwan Woo),정성윤(Sung-Yoon Jeong),신정란(Jeong-Ran Shin),전영태(Yeong-Tae Jeon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The implementation of subsea separation and liquid boosting is becoming a common development scheme for the exploration of deep water fields. Subsea separation system should reliable. To ensure successful operation in a wide range of 3-phase flow regime, without need for developments. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, multiphase flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system.