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포신 마모 예측의 정확도 향상을 위한 적합 근사식 유도(Ⅰ)
정동윤(Chung Dong-Yoon),오명호(Oh Myoungho) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
We predict the unknown cannon tube erosion rate by using observed values of the standard cannon, 155㎜ Howitzer M185. We know the standard cannon's ten erosion observation values each 400 rounds. An approximate formula fitting the erosion values of the standard cannon has been derived. Numerical simulation applying this formula to the Rauf Imam's erosion equations is presented.
정동윤(Dong-Yoon Chung),오명호(Myoungho Oh),신내호(Naeho Shin) 한국트라이볼로지학회 2009 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.25 No.3
One of the critical issues associated with the 40㎜ long hollow cylinder's development and maintenance is the prediction of cylinder erosion. The actual firing test is the most accurate method to measure the cylinder erosion rate. But it costs a great deal and requires a long measurement time. Hence many empirical methods have been proposed to predict the erosion rate and life span of long hollow cylinders. An EFC formula is calculated. An approximate erosion formula for the ammunition type A is derived to interpolate 16 observation values up to 4,000 rounds. A new erosion equation and muzzle velocity formula are also suggested. Several numerical results are presented.
온도 측정과 분석을 통한 40 mm 장축공동실린더의 열적특성 고찰
신내호(Naeho Shin),정동윤(Dong-Yoon Chung),오명호(Myoungho Oh),유삼현(Sam-Hyeon Yoo),남석현(Seok-Hyun Nam) 한국트라이볼로지학회 2006 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.22 No.4
A simple and effective analysis method is presented for gaining a complete transient temperatures on the internal and external surfaces of a 40 mm gun tube subjected to a series of rapid firings. Two series of temperature data for both Hs and As were measured by using two rapid response k-type surface thermocouples near the firing origin and the muzzle. With other available temperature data, patterns of temperature variations of the gun tube as a function of time variable were driven through complete evaluations of the data. It is found that overall temperature gradients which increase exponentially toward saturation temperature, actually consist of a series of linear temperature gradients corresponding to the firing sequences. Under the similar firing sequences, patterns of temperature variations for both the surface temperatures near the chamber and those near the muzzle were found to have linear temperature gradients with different values and the same response frequencies, i.e. they had peaks and lows in emperatures at the same time. The resultant complete temperature data can be used as the fundamental bases for analysis of thermoelastic properties of the materials such as thermal strian and stress, and for the prediction of cannon tube life-time through calculation of wear rate.
정근우(Keunwoo Chung),김영운(Young-Wun Kim),이상봉(Sangbong Lee),홍종승(Jongsung Hong),한상재(Sangjae Han),오명호(Myoungho Oh) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.6
Currently, in order to resist the scratching of the fuel rod surface while fabricating the fuel assembly of the light-water nuclear reactor, we use a solution of nitrocellulose, an explosive material, as a dry lubricant along with its solvent. However, the demand for developing safe and harmless aqueous alternative materials for environment-conservation and field-worker safety has increased. In this study, we demonstrate the preparation of a novel aqueous resin composite using a formulation of aqueous polymeric resin, alcoholic solvent, and water. Subsequently, we characterize this composite on the basis of hardness, adhesive property, and water solubility using plates similar to the fuel rod material. The insertion test of a fuel rod coated with the YS-3 composite shows load values of 18.8-20.5 kg/㎠, which is comparable with 18.0-20.5 kg/㎠ of the nitrocellulose coating agent. In addition, the depth and width of longitudinal scratches caused by the YS-3 composite test are 50% higher than those of the standard. We can develop a harmless and safe aqueous dry lubricant to replace the existing NC products through field testing of 264 pieces of fuel rods, after producing 350 kg of the YS-3 prototype. The scratch test for the rod surface showed that weight of chip of YS-3 prototype was smaller than that of NC before and after solvent treatment, indicating the properties of YS-3 prototype was comparable to the counterpart.
정근우(Keunwoo Chung),김영운(Young-Wun Kim),이상봉(Sangbong Lee),홍종승(Jongsung Hong),한상재(Sangjae Han),오명호(Myoungho Oh) 한국트라이볼로지학회 2014 한국트라이볼로지학회 학술대회 Vol.2014 No.10
In order to resist the scratch of fuel rod surface while fabricating fuel assembly for light-water nuclear reactor, nitrocellulose as a dry lubricant, which is an explosive material, and its solvent to dissolve have been used so far. However, there is an increased demand to develop the safe and harmless aqueous alternate materials for environmental conservation and field-workers safety. This study demonstrated that a novel aqueous resin composite was prepared with formulation of aqueous polymeric resin and alcoholic solvent and water, which was subsequently characterized with hardness, adhesive property, and solubility for water using some plate similar with the fuel rod materials. The insertion test of fuel rod coated with YS-3 composite showed the load values of 18.8-20.5 kg/cm², which is comparable with 18.0-20.5 kg/cm² of nitrocellulose coating agent. In addition, the depth and width of longitudinal scratches caused by the test using YS-3 composite was 50% better than those of standard. We could develop harmless and safe aqueous dry lubricant to replace the existing NC products through field demonstration testing 264 pieces of fuel rods after producing 350 kg of YS-3 prototype.