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RISS 인기검색어
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- 저자 : Sun Guangyi (검색결과 3 건)
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Development of a Miniature Shear Sensor for Direct Comparison of Skin-Friction Drags
Guangyi Sun,Hyungmin Park,Kim, Chang-Jin Institute of Electrical and Electronics Engineers 2015 Journal of microelectromechanical systems Vol.24 No.5
<P>This paper presents the design, fabrication, and characterization of a silicon-micromachined mechanical sensor that directly compares the wall shears of two different surfaces in a liquid flow. The 27 mm × 27 mm sensor contains two 10 mm × 20 mm × 0.2 mm plates suspended to displace in proportion to the shear force on each surface. The monolithic sensor designed to compare skin-friction drag on two different surfaces consists of two floating plates, each suspended from a frame by identical flexure beams etched out of a 0.2-mm-thick silicon wafer. Design of the sensor is assisted by finite-element analysis to ensure adequate structural characteristics in the intended flows and validated by experimental characterization. The fabrication process is presented in detail, including how to form millimeter-long beams with a uniform cross section in micrometers and release the centimeter-scale plates suspended by the delicate beams. This paper provides a guidance to develop a miniature shear comparator using silicon microfabrication technologies.</P>
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Yan Liu,Shawei Tang,Guangyi Liu,Yue Sun,Jin Hu 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
In this study, a welded Ti-6Al-4V alloy was treated by means of local rapid induction heating in order torelax the residual stress existed in the weldment. The welded samples were heat treated at the differenttemperatures. The stress corrosion cracking behavior and electrochemical characterization of the as-weldedsamples before and after the post weld heat treatment as a function of residual stress were investigated. Electrochemical impedance spectroscopy measurements of the samples under slow strain rate test wereperformed in a LiCl-methanol solution. The results demonstrated that the residual stress in the as-weldedsample was dramatically reduced after the post weld heat treatment, and the residual stress decreased withthe increase in the heat treatment temperature. The stress corrosion cracking susceptibility and electrochemicalactivity of the as-welded sample were significantly reduced after the heat treatment due to therelaxation of the residual stress, which gradually decreased with the decreasing value of the residual stressdistributed in the heat treated samples.
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Research and practice on oil displacement law of different well pattern in offshore oilfield
Wang Peng,Wang Shaopeng,Zhang Hongyou,Sun Guangyi,Zhai Shangqi,Chang Huijiang,Zhang Chengli 한국자원공학회 2021 Geosystem engineering Vol.24 No.6
BZ oilfield is the first oilfield successfully developed with large-scale horizontal well pattern in Bohai sea. In order to study the well pattern suitable for offshore fluvial sedimentary oilfield, based on the characteristics of offshore oilfield, such as large well spacing, few wells and complex well pattern, the authors designed a set of heterogeneous reservoir models under the guidance of similarity theory. The different well patterns, different displacement rates and different heterogeneity were simulated. The different displacement effects were studied by measuring the electrical characteristics, injection volume, oil production and water production of the model. It is found that the horizontal well pattern is used for low-speed development, the water breakthrough of oil wells is slow in the relatively homogeneous reservoir. In the heterogeneous high permeability reservoir(Jk = 4), the oilfield adopts low-speed development by using staggered well pattern, the water breakthrough of the oil well is slow, and the EOR is large. In the heterogeneous high permeability reservoir(Jk = 6), the oilfield adopts the combined well pattern for low-speed development, the EOR is large. This study deepens the understanding of the development law of horizontal well pattern and the distribution law of remaining oil, and provides a basis for oilfield development and adjustment.
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