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정기범(Gi Beom Jeong),박태원(Tae Won Park),박재흥(Jae Heung Park),정남호(Namho Chung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Considering the dynamic performance and stability of railroad vehicles has begun to grab the attention because of developing the high speed train recently. A development based on an analysis of dynamics and verification has to be required to study the stability of vehicle performance. Several ways of analysis were using the look-up table to apply the wheel-rail contact characteristics quickly whereas there is a constraint of the wheelset lateral displacement. In this study an development of searching the wheel-rail contact position has been provided. The 2-point contact between wheel and rail during the driving condition can be calculated by numerical analysis. Moreover a reliability is verified by comparing the result with a commercial program.
정기범(Jeong Gi-Beom) 역사실학회 2002 역사와실학 Vol.22 No.-
In history, Eumseong(陰城) area has been an important traffic function through the south and north, even in these days. In this paper, I have used a kind of regional historic method for traffic roads and settlements of Eumseong(陰城). I have also examined in a restoration and function of old traffic roads, a formation, development and function of settlements for characteristic history. In ancient traffic roads of Eumseong(陰城), at first, Goguryeo built a preliminary road from Pyeongyang(平壤) to Chungju(忠州) when they advanced to Han river area, and when they opposed with Shilla which built the military road from Cheongju(淸州), Jungpyeong(曾坪), Geyribryeong(鷄立嶺) to Goesan(槐山) that the road went through Eumseong(陰城) area. The second, when Shilla advanced the Han River area, they built Samnyeon-castle(三年山城) in Boeun(報恩). The debouche of the Han River area were estimated from Boeun(報恩)→Miwon(米院)→Jeungpyeng(曾坪)→Jincheon(鎭川)→Eumseong Mang-icastle(望夷山城)→Juksan(竹山) to Hanam(河南) join Seoul direction, from Jincheon(鎭川)→Eumseong(陰城) Mang-icastle(望夷山城)→Icheon(利川) to Hanam(河南) join Seoul direction. Both of roads passed Eumseong(陰城) area. Nowadays, westside of Eumseong(陰城) area which went through between the east and west of Mang-icastle(望夷山城) in Yangdeokri(良德里) in Samseongmyeon(三成面). The third, Geyripryeong(鷄立嶺) connected between the Han River area and the River Nakdong area from Shilla ages to Goryeo ages which is a ridge of road which was the main road from middle area of Korea to Youngnam(嶺南) area. Shilla advanced Cheongju(청주) area though Geyribryeong(鷄立嶺). The traffic road were split from the north west side road(from Chungju(忠州)→Eumseong(陰城)→Gamgok(甘谷)→Janghowon(長湖院) to Seoul) and the westside road(from Chungju(忠州) to Eumseong(陰城). The westside road was estimated from Chungju(忠州) Gageum(可金)→Judook(周德)→Eumseong(陰城) Seokinricastle(碩人里山城), Sujeongcastle(水精山城)→Eumseong(陰城) Wonnam(遠南) Odaecastle(五垈山城)→songorihyun(松五里峴)→Jeungpyeng(曾坪)→Miwon(米院). And from Gamgok(甘谷) of Eumseong(陰城) area to Ichoon(利川) of the north westside traffic road were two ways. One of the road was from Chungju(忠州), Gageum(可金) Tappyoongri(塔坪里)→Ipsukmaeul(立石)→Noeunmyen(老隱面) yeonhari(蓮河里)→Beobdongri(法洞里)→Soltigogae→Eumseong(陰城) Gamgok(甘谷)→Janghowon(長湖院) to Icheon(利川), and the other way was from Chungju(忠州)→Gageum(可金) Tappyeongri(塔坪里)→Gaguem(可金)→Angseong(仰城)Neungam(陵岩)→Naedonggogae(內洞)→Imungogae→Eumseong(陰城) Gamgok(甘谷) Munchon(文村)→Janghowon(長湖院) to Ichron(利川) The fourth, the traffic road of Eumseong(陰城) area in Goryeo ages was from Namkeong(南京)→Gwangju(廣州)→Icheon(利川)→Eumseong(陰城) Mugeuk(無極), Yongan(龍安)→Danworl(단월)→Chungju(忠州)→Yecheon(醴泉) to Andong(安東), and from Namkyung(南京)→Yongin(龍仁)→Yangji(陽智)→Juksan(竹山)→Eumseong(陰城)→Gamgok(南京)→Gaheung(可興) to Chungju(忠州). The fifth, from Youngnam(嶺南) main road in Joseon ages through Eumseong(陰城) area and the circumference was from Hanyang(漢江)→Yangji(陽智)→Juksan(竹山)→Seokwon(石院)→Gawnchon(館村)→Saenggeuk Gonjae(笙極昆在)→Cheongok(泉谷)→Jangjawulgogae→Morowon(毛老院)→Sungseon(崇善)→Yongan(龍安)→Geomdan(檢丹)→Dalcheon(達川)→Chungju(忠州)→Joryeong(鳥嶺) to Yeongnam(嶺南). From Seokwon(石院) to Jangjawulgogae in Eumseong(陰城). Eumseonghyeon(陰城縣) had 6 side of local road according to old record of literature and old map. From Seoul direction, the road had three section. (1) Eumseong(陰城)→Tanhyeon(炭峴)→Sinnimyen(新尼面) Morowon(毛老院) join with Yeongnam(嶺南) main road (2) Eumseong(陰城)→Sajeonggogae(沙丁)→Sajeongri(沙丁里)→Mugeuk(無極)→Dogwanri(道貫里)→Gwanchon(館村) join with Yongnam(嶺南) main road. (3) Eumseong(陰城)→Sincheonri(新泉里)→Gamujae(甘雨峙)→Sajeongri(沙丁里) join with the road of (2). The road of Chungju(忠州) direction were from Eumseong(陰城)→Baekhyeon(栢峴)→Bisanri(碑山里)→Judeok(周德) to Chungju(忠州) and from Eumseong(陰城)→Seokinri(碩人里)→Akhyeon(惡峴)→Bisanri(碑山里)→Judeo k(周德) to Chungju(忠州). The road of Cheongju(淸州) direction was from Eumseong(陰城)→Hadang(下唐) Yangheywon(楊惠院)→Haengchi(杏峙)-Bocheon(甫川)→Songorihyen(松五里峴)→Cheongan(淸安) to Cheongju(淸州). The road of Goesa
정성필(Sung Pil Jung),박태원(Tae Won Park),조재익(Jae Ik Cho),정기범(Gi Beom Jeong),정원선(Won Sun Chung) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this study, a transient FE analysis method was used to analyze the fully coupled thermo-mechanical problem for a disc brake system. Mechanical and thermal model for the disc brake were generated separately, and solved iteratively. Three dimensional FE model of a disc brake was created. The mechanical model of the disc brake was assumed to be in braking with an acceleration of 0.3g from 1400 rpm to 700 rpm. The thermal model with an initial temperature of 80℃ interacts with the mechanical model, and the friction heat between the pad and disc is generated by the friction contact condition. Due to the heat generation, the material of disc is expanded and alters the contact condition.
2 점 접촉을 고려한 휠-레일의 동역학적 해석 프로그램 개발
정남호(Nam Ho Chung),박태원(Tae Won Park),정기범(Gi Beom Jeong),심경석(Kyung Seok Sim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
As developing further fast high speed railway, examining the dynamic performance and stability of railway vehicle have become more important. Wheelset dynamic analysis is essential for the running quality and stability of railway vehicle. Therefore, this study covers the algorithm and module for dynamic analysis of railway vehicle which are based on wheel-rail contact. Especially 2-point contact between wheel tread-rail and wheel flange-rail contact which occurs in driving condition. Following wheel-rail contact, Creep Force which is caused from penetration between wheel and rail has calculated by Hertz theory and dynamic analysis of railway vehicle computed through one of numerical method, Runge-Kutta.