SMART MMIS 개발을 위한 설계현안 정보시스템

박근욱,이철권,구인수,차경호,장문희 대한산업공학회 1998 대한산업공학회 추계학술대회논문집 Vol.1998 No.10

자동차 타이어 제조용 알루미늄 합금 금형 내부의 열변형 고찰

박근욱,오율권 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1

This paper investigated on thermal deformation of the inside of Aluminum alloy (A1-Alloy) mold for manufacturing automobile tire by the numerical and experimental works. A1-Alloy mold selected as an analysis model is composed Al-Mg system and called AC7 A as a casting material. Also, in this study, it is actually produced in a manufacturing factory and its manufacturing system was applied the method of metal casting instead of sand casting. The numerical and experimental works was performed that the temperature, displacement and stress distribution occurred inside of Al-Alloy mold was calculated by finite element method (FEM) and the temperature distribution was experimentally measured from when the molten AC7 A is injected to inner casting device until completed solidification of tire mold. The numerical results revealed that temperature distribution inside of Al-Allov mold occurred a rapid cooling from the beginning injection of casting material about 20 minutes. And, the results of displacement and stress pattern were happened at the measurement points in tread part because of the temperature difference by the rapid cooling of tire mold. The result of experimental study also revealed that measured temperature distribution was similar pattern as a numerical result. Therefore, introduced numerical method will be easily predicted the thermal characteristics of casting material during the manufacturing tire mold and will be utilized as an important data in the industries associated with automobile production.

二相 流動場에서 流動樣式 判別에 關한 硏究

박근욱,오율권 조선대학교 생산기술연구소 1998 生産技術硏究 Vol.20 No.1

The analysis of single phase flow is made easier if it can be established that the flow is either lamina or turbulent and whether any separation or secondary flow effect occurs. The information is equally useful in the study of gas-liquid flow. However, perhaps of greater importance in the latter case is the topology or geometry of the flow. When a liquid is vaporized in a heated channel the liquid and vapour generated take up a variety of configurations known as flow pattern. The particular flow pattern depends on the condition of pressure, flow, heat flux. and channel geometry. Each has a descriptive name and in the design of a heat exchanger it is desirable to know what the flow pattern or successive flow pattern are so that a hydrodynamic of heat transfer theory appropriate to that pattern can be chosen. The purpose of the present work is that flow pattern was discriminated by probability density functions corresponding to the statical measurement for electrical conductivity probe signal and flow visualization

배기계에서 비정상 가스의 소음특성에 관한 해석

박근욱,신문섭,장옥수,오율권 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1

일반적으로 자동차의 소음은 주로 엔진에서 발생되어서 공기를 통해 전달되는 소음과 흡·배기계를 구성하는 tube 또는 Chamber를 통하여 전달되는 소음으로 구성된다. (1) 차량소음의 주요 소음원은 흡기계의 흡기소음과 배기계의 배기소음을 들 수 있으며, 소음중 배기소음은 도시소음의 주된 요인이며 차량의 승차감을 저해하는 간접적인 원인 중의 하나이다. 따라서 일반적인 자동차에는 반드시 소음기 즉, 머플러를 부착하여 소음을 어느 정도 이하로 감소시키게 되어 있다.(2.3) 전통적으로 소음기에 대한 연구는 주로 음향필터이론에 바탕을 두고 진행되어왔으나 음향필터이론은 배기소음기의 소음감쇄작용에 대한 체계적인 이론적 설명을 제시하지는 못했다. 음향에너지의 소산(Dissipation)을 고려하지 않고 음향이론상에서 배압을 예측하는 것은 불가능하다.(4) 그로므로 본 연구에서는 내연기관의 다양한 배기시스템에 대하여, 비선형 작용을 고려하므로서 1차원 비정상 등엔트로피 분석을 이용한 특성법(5)을 사용하였으며, 이러한 분석법에 배기시스템내에서 유동현상의 완전한 처리를 위하여 준정적 유동 접근법에 근거한 경계모델을 포함시켰다. 또한 이론의 타당성을 검증하기 위하여 최근까지 연구되어져온 블로오등을 사용한 시험결과는 달리 로터리 밸브 시뮬레이터를 사용하여 압력-시간 파형을 측정하였으며 측정된 결과와 계산된 결과를 비교하여 맥동 압력파 전파 특성을 확인하였다. 본 연구의 목적은 엔진 성능과 관계된 비정상 가스유동의 거동특성을 유한진폭과 이론을 사용하여 성공적으로 예측하는 방법을 제시하는데 있으며, 각 머플러에 대한 소음감쇠특성 및 소음기의 일반적인 특성을 분석하는데 있다. This thesis describes a theoretical and experimental investigation of the pressure propagation characteristics of some basic internal combustion engine exhaust systems. The mufflers of internal combustion engine have been applied to control the exhaust noise for many years. The greatest reduction in engine noise is generally achieved through proper muffler selection. Although proper muffler selection may seem relatively simple, a numbers of considerations must be made. Additional considerations in the reduction of exhaust system noise include proper selection of piping lengths and diameters, proper mounting of exhaust system components, and proper positioning of the exhaust outlet. In the present work, account is taken of the nonlinear behavior. For sections of parallel pipe, an one-dimensional unsteady homentropic analysis is employed, and a numerical solution is obtained with the aid of a digital computer, using the concept of characteristics. This analysis is than combined with boundary models, based on a quasi-steady flow approach, to give a complete treatment of the flow behavior in the exhaust system

Air-Water 모델에서 가시화를 통한 유동특성에 관한 연구

임태훈,박근욱,서동표,정낙규,김진흥,오율권 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2

In the air-water model, the characteristics of flow parameters were experimentally investigated. An electro-conductivity probe was used for measuring flow parameters such as local volume fraction and bubbles frequency. The flow parameters were very high at the near nozzle. For visualization of flow characteristics, a camera technique method and a thermo vision camera were adopted in the present study. The experimental results shows that the heat transfer from bubble surface to water is almost achieved within z=10[mm〕 from the nozzle. Then the temperature of bubble surface teaches to the water temperature in a short time. The camera and argon illumination laser were applied to the water circulation zone for flow visualization. The flow was more developed near the wall than at bubble-water plume. Voltex flow in the bottom region was relatively weaker than in the upper region.

FEM을 이용한 자동차 타이어용 알류미늄 합금 금형의 열변형 특성에 관한 연구

오율권,서동표,양호동,박근욱,김용범 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1

대부분의 타이어 제조를 위한 금형생산 공정은 실험적인 결과에 바탕을 두어 거의 경험치에 의존하고 있다. 이러한 방법은 금형제품을 생산하는데 있어 비효율적이고 비경제적인 측면이 많다. 따라서, 정밀도를 향상시키고 품질이 좋은 타이어를 제조하기 위해 금형의 제조공정은 재평가가 이루어져야 한다. 본 연구에서는 자동차 타이어용 알루미늄 합금 금형의열변형 및 특성을 조사하기 위해 유한요소법을 이용하여 수치해석적으로 연구를 수행하고자 하였다. 알루미늄 합금의 금형의 열변형 및 특성에 관해 조사하기 위해, 알루미늄 합금 금형 내부에서 발생되는 온도분포, 수축량, 응력 그리고 변형량을 수치해석적으로 계산하는연구를 수행하였다. 뿐만 아니라, 정밀도를 향상시키고 좋은 품질의 금형을 얻기 위해, 알루미늄 합금과 연강의 수치해석 결과를 비교하였다. 결국, 수치해석을 통해 얻은 결과들은향후 효과적이고 최상의 금형 제품을 제작하는데 도움을 줄 수 있으리라 본다. Most the mold product process is based on a experimental results and is almost dependent on experiments for tire manufacturing. This method produced the mold product is not only the ineffectiveness but also the bad economy. So, the product process of metal mold should be revaluated to produce the improved precision and good quality of tires. In this study, numerical analysis applied a finite element method (FEM) was used to predict the thermal strain characteristics of Aluminum (AI) alloy mold for automobile tire. To investigate the thermal strain and characteristics of Al alloy mold, it was performed that the temperature distribution. the contraction rates, the stress and the strain occurred on the inside of Al alloy mold was calculated by numerical works. Moreover, numerical analysis results of Al alloy mold were compared with those of mild steel mold in order to obtain the improved precision and good quality of mold. So, the numerical results of this study will be presented to help to make the effective and the best mold products.

초음파 가진 위치에 따른 상변화물질의 용융특성 연구

윤정환(Joung-Hwan Youn),박근욱(Keun-Uk Park),오율권(Yool-Kwon Oh) 대한설비공학회 2001 대한설비공학회 학술발표대회논문집 Vol.2001 No.-

The Mechanical Properties in Polyolefin Ternary Blends Having Elongated Layer and Particle Type Morphology

도인환,김병규,정한모,박근욱 한국고분자학회 1995 한국고분자학회 학술대회 연구논문 초록집 Vol.1995 No.4

AC7A를 이용한 사형주조에서 타이어 몰드의 열변형에 관한 유한요소 해석

오율권(Yoolkwon Oh),김용범(Yongbum Kim),양호동(Hodong Yang),박근욱(Keonuk Park),서동표(Dongpyo Seo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

The present study analyzed on thermal strain of the AC7A tire mold produced in sand castings by FEA. To predict the numerical result of thermal strain in AC7A mold during the cooling process, it is performed the investigation of temperature distribution, stress and strain based on the physical properties of AC7A. In results of this study, the temperature distribution result of AC7A mold is more uniform than mild steel mold and the cooling time of AC7A mold is more short than it. Also, the results of strain and stress in AC7A mold is better than it. In addition, AC7A and mild steel mold is revealed that cooling curve was observed the rapid pattern in 20 minutes after beginning cooling process and difference in temperature of mold is the biggest. These results are presented to help to make the effective and the precision tire mold. Also, the introduced technique of numerical analysis is very useful and especially needs to improve the high precision mold in the industrial aspect.

수치해석을 이용한 Tire Mold용 Al 금형의 온도분포 해석에 관한 연구

양호동(Ho-Dong Yang),오율권(Yool-Kwon Oh),서동표(Dong-Pyo Seo),박근욱(Keun-Uk Park),김우진(Woo-jin Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

The plant of Al alloy mold must be established to produce the good quality tires. But mild steel molds are used as tire mold which is consist of one piece. This type of metal mold is more economic in the total cost but the quality of product is not good. Therefore, in the present study, Al alloy mold which consist of six pieces was introduced. And, numerical work using a finite element method (FEM) was applied to analyze that Al alloy mold was happened the characteristics of temperature distributions. Also, the contraction rate occurred by temperature distributions investigated to predict the accurate measurement variations of Al alloy mold.