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Journal of Korean Society of Industry Convergence

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수록정보
수록범위 : 1권1호(1998)~23권4호(2020) |수록논문 수 : 902
한국산업융합학회 논문집
23권4호(2020년 08월) 수록논문
최근 권호 논문
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KCI등재

1Failure Analysis and Countermeasures of SCM435 High-Tension Bolt of Three-Step Injection Mold

저자 : Seo-hyun Yun , Ki-woo Nam

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 531-539 (9 pages)

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When injection mold is repeatedly used for mass production, fatigue phenomenon due to cyclic stress may occur. The surface and interior of structure might be damaged due to cyclic stress or strain. The objective of this study was to analyze failure of SCM435 high-tension bolts connecting upper and lower parts of a three-stage injection molding machine. These bolts have to undergo an accurate heat treatment to prevent the formation of chromium carbide and the action of dynamic stresses. Bolts were fractured by cyclic bending stress in the observation of ratchet marks and beach marks. Damaged specimen showed an acicular microstructure. Impurity was observed. Chromium carbide was observed near the crack origin. Both shape parameters of the Vickers hardness were similar. However, the scale parameter of the damaged specimen was about 20% smaller than that of the as-received specimen. Much degradation occurred in the damaged specimen. Bolts should undergo an accurate heat treatment to prevent the formation of chromium carbide. They must prevent the action of dynamic stresses. Bolts need accurate tightening and accuracy of heat treatment and screws need compression residual stress due to peening.

KCI등재

2Study on the Production of Aluminum Components by Direct Rheo Die Casting with Electromagnetic Stirrer

저자 : Joong-suk Roh , Min Heo , Chul-kyu Jin , Jin Ha Park , Chung-gil Kang

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 541-547 (7 pages)

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This paper relates a rheo die casting using electromagnetic force, which is one of the representative semi-solid methods for aluminum. The most important factors in electromagnetic stirring would be the melt temperature, sleeve temperature, electromagnetic force, and input time. The effect of the temperature of molten alloy on the direct rheo-casting is assessed in this study. The temperature of the molten alloy is set to 590 ℃ with a solidification of 40%, 600 ℃ with 30%, and 610℃ with less than 20%. Under the condition of 590 ℃ with a solidification of 40%, the whole molten alloy is solidified, causing non-forming during forming process. Meanwhile, under the condition of 600 ℃, where the solidification was 30%, appropriate amount of molten alloy is solidified, filled well into the mold, resulting in good forming, while at 610 ℃ with the solidification of 20%, the molten alloy is not sufficiently solidified and scattered away. The investigation of the defects inside the product with the help of the X-ray equipment shows that the electromagnetic stirring at 590 ℃ with a solidification of 30% produces many air-pores inside the product.

KCI등재

3A Study on Track Record and Trajectory Control of Robot Manipulator with Eight Joints Based on Monitoring Simulator for Smart Factory

저자 : Hee-jin Kim , Gi-won Jang , Dong-ho Kim , Sung-hyun Han

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 549-558 (10 pages)

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We describe a new approach to real-time implementation of track record and trajectory control of robotic manipulator with eight joints based on monitoring simulator. Trajectory generator uses the kinematic equations of the arm to convert the task description into a series of set points for each of the joint control loops, while the joint controllers, with simple algorithms for just one joint can move at a fast sampling rate, guaranteeing a smooth motion. The proposed control scheme is robust, fast in computation, and suitable for real-time control. Moreover, this scheme does not require any accurate parameter information, nor values of manipulator parameters and payload. Reliability of the proposed technology is veriefied by monitoring simulation and experimental of robot manipulator for the smart factory with eight degrees of freedom.

KCI등재

4Grid-Connected Three-Phase Inverter System with Sub Inverter using Combination Type UPFC Structure

저자 : Seong-mi Park , Le Thi Tuan Vi , Da-woom Jeong , Sung-jun Park , Jang-sik Park

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 559-567 (9 pages)

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As the renewable energy market grows, grid-connected inverters have been improving and expanding in several fields in recent years because energy conversion devices are the main components of solar systems. In this paper, a high-precision new grid-connected three-phase inverter system is proposed. The proposed system consists of a main inverter, a sub inverter and a transformer. The main inverter operates at a low switching frequency and high power and transmits power to the grid. A sub-inverter connected in series with the transmission line through a matching transformer operates at lower power than the main inverter to provide input values to the transformer. The transformer acts as a power supply according to the voltage compensation value. This study is based on the principle of operation of the UPFC(Unified Power Flow Controller) structure used to regulate power flow in AC transmission lines. The grid-connected inverter system proposed in this paper is implemented with high precision and high resolution. The proposed system was verified through its ability to enhance and ensure the safety of the proposed system through simulation and experiment.

KCI등재

5HAZOP을 통한 해양플랜트 흡착식 탈수공정 패키지의 위험성평가 및 안전도 향상 방안

저자 : 노현정 ( Hyonjeong Noh ) , 박상현 ( Sanghyun Park ) , 조수길 ( Su-gil Cho ) , 강관구 ( Kwangu Kang ) , 김형우 ( Hyungwoo Kim )

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 569-581 (13 pages)

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Since the dehydration packages of offshore plant deal directly with oil & gas, there is a great risk of fire and explosion during operation. Therefore, this study performed risk assessment through HAZard & OPerability (HAZOP) for solid desiccant dehydration package that can remove water component of natural gas in offshore floating liquefied natural gas (LNG) production facilities below 0.1 ppmv. The risk matrix was determined by dividing the likelihood and the severity into five levels separately by asset, life, environment and reputation. The piping & instrumentation diagram (P&ID) of the dehydration package was divided into 9 nodes. Total 22 deviations were assessed in consideration of the adsorption and desorption conversion cycle. A risk assessment based on deviations revealed 14 major hazards. Three representative types of hazards were open/close failure of the control valve, control failure of the heater, and abnormal operation of the regeneration gas cooler. Finally, we proposed the installation of additional safety devices to improve safety against these major hazards, such as safety instrumented functions, alarms, etc.

KCI등재

6황토와 다공성 규조토 필터에 의한 실내 오염 물질의 흡착 연구

저자 : 김호건 , Akhmadalieva Irodakhon , 남기우

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 583-591 (9 pages)

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Environmental problems have showen over the past decades due to the rapid development of the world economy and the continued growth of the population. Ocher has been widely used for water treatment research, but few studies have been conducted on adsorption of air pollutants using ocher and porous diatomite earth for indoor air purification. In this study, ocher and diatomite earth were sintered with filters to remove indoor air pollutants. The four types of TMA, H2S, NH3 and CH3COOH were used to study the adsorption efficiency of ocher and porous diatomite filters. With the proper use of ocher, diatomite and copper catalysts, indoor air pollutants could be adsorbed. Alkaline substances (TMA and NH3) and acidic substances (H2S and CH3COOH) were able to adsorb at 120 and 90 minutes, respectively.

KCI등재

7심박수를 이용한 임목수확작업의 작업강도 분석

저자 : 백승안 ( Seung-an Baek ) , 이은재 ( Eun-jai Lee ) , 남기훈 ( Ki-hun Nam ) , 조구현 ( Koo-hyun Cho )

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 593-601 (9 pages)

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This study was conducted to analyze the physical strain with heart rate monitor in timber harvesting operations in order to reduce occupational accidents. The timber harvesting activities are manual cutting(felling, limbing and bucking) with a chainsaw and extraction by cable yarder. The study took place on Japanese larch stand. The average height was 26m and average diameter at breast height(DBH) was 37cm. The havest unit was gentle slope to steep slope. Results showed that the heart rate increases for chocking, felling, limbing and bucking were 94.0%, 87.9%, 84.8% and 56.4% respectively. The rate of Work Load Index was higher in the limbing(61.4%) activity than other activities chocking(55.2%), felling(54.1%) and bucking(32.1%). During 50% working heart rate test it was found that limbing(1.09), chocking(1.05) and felling(1.04) was exposed to high work intensity compared to bucking(0.83). The results showed that maximum acceptable work times(felling, chocking and limbing) were 2.30 hour, 1.85 hour and 1.60 hour respectively. To avoid occupational accidents, timber harvest workers may use a suitable working hour schedule to felling, chocking, limbing.

KCI등재

8원자력 발전소에서 쓰나미 방지용 댐퍼에 대한 구조해석

저자 : 진도훈 ( Do-hun Chin )

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 603-609 (7 pages)

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The purpose of this study is to research dampers, which are applied mainly to buildings adjacent to the coast, such as nuclear facilities, and used for ventilation and can safely protect lives and equipment in emergency situations. Comparing the equivalent stress for three models with hinge reinforcement and support reinforcement based on the early design model for Damper, in the Base model, the highest stress occurred in the part of hinge, especially in the centrally mounted hinge, and after reinforced the hinge, it was occurred in the rear support. For models reinforced hinges and supports, it is considered that reinforcement for stiffness will be required in the future as it entered within the range of allowable stress. For the safety factor distribution, the minimum safety ratio was sufficiently secured at least 1 and was high at the edge of the Damper frame and the Blade. As the hinge was reinforced, the safety factor distribution of Blade was increased, and it was verified that the safety factor was secured through the support reinforcement.

KCI등재

9반복적인 충격하중을 받은 PC 플라스틱 재료의 변형 및 수명 평가

저자 : 이진경 ( Jin-kyung Lee )

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 611-616 (6 pages)

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Polycarbonate (PC) materials having electrical insulation properties, are thermoplastic material and are easily processed, have excellent strength and heat resistance characteristics, and also have transparent and hard characteristics. In this study, we tried to derive the ε-N curve of strain-life, which shows the relationship between the strain characteristics and the life of the material when repeated impact loads are applied to the PC plastic material. As the impact load increased to 3.0kg, 4.0kg, 5.0kg, and 6.0kg, the strain also increased linearly to 0.033, 0.041, 0.046, and 0.055. At 3.0kg of mass impact, the test piece broke with 12000 impact cycles, 8400 times at 3.5kg, 7400 times at 4.0kg, 6600 times at 4.5kg, 4700 times at 5.0kg, 3000 times at 5.5kg, and 1000 times at 6.0kg. The number of fractures exponentially decreased as the load gradually increased. Using these results, an ε-N curve for PC plastic was derived.

KCI등재

10육상 시추용 머드탱크의 교반성능에 대한 수치해석적 연구

저자 : 황종덕 ( Jong-duck Hwang ) , 구학근 ( Hak-keun Ku )

발행기관 : 한국산업융합학회 간행물 : 한국산업융합학회 논문집 23권 4호 발행 연도 : 2020 페이지 : pp. 617-626 (10 pages)

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The drilling mud is essentially used in oil and gas development. There are several roles of using the drilling mud, such as cleaning the bottomhole, cooling and lubricating the drill bit and string, transporting the cuttings to the surface, keeping and adjusting the wellbore pressure, and preventing the collapse of the wellbore. The fragments from rocks and micro-sized bubbles generated by the high pressure are mixed in the drilling mud. The systems to separate those mixtures and to keep the uniformly maintained quality of drilling mud are required. In this study, the simulation is conducted to verify the performance of the mud tank's agitation capacity. The primary role of the mud tank is the mixing of mud at the surface with controlling the mud condition. The container type is chosen as a mud tank pursuing efficient transport and better management of equipment. The single- and two-phase simulations about the agitation in the mud tank are performed to analyze and identify the inner flow behavior. The convergence of results is obtained for the vertical- and axis-direction velocity vector fields based on the grid-dependency tests. The mixing time analysis depending on the multiphase flow conditions indicates that the utilization of a two-stepped impeller with a smaller size provides less time for mixing. This study's results are expected to be utilized as the preliminary data to develop the mixing and integrating equipment of the onshore drilling mud system.

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