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허현무,권영필,최경진,Hur, Hyun-Moo,Kwon, Young-Pil,Choi, Kyung-Jin 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7
The purpose of this study is to analyze the effects of the parameters of the suspension system in railway rolling-stock for KT-23 type passenger vehicle. According to the results of simulation and the field test, Optimal condition was obtained for the stiffness ratio of the primary spring and the secondary of the suspension system. When the stiffness ratio was increased, the vibration was increased on the car body and decreased on the bogie, and ride quality are getting worse because of increase of the vertical natural frequency of the car body. The results of this study are usefull to improve the technology of the ride quality of KT-23 type vehicle.
허현무(Hur Hyun-Moo),권성태(Kwon Sung-Tae),최경진(Choi Kyung-Jin),김완두(Kim Wan-Doo) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Air spring for railway rolling stock is a part of secondary suspension system, which is supporting load, damping vibration. Recently, air springs are actively applied to railway rolling stock to substitute the coil spring by upgrading the manufacturing skill. This study is started to develop draft for the testing methods of air spring for railway rolling stock. We have tested several items on testing methods to guarantee the performance of air spring. Thus, we have developed the test draft for air spring.
허현무(Hur Hyun-Moo),함영삼(Ham Yong-Sam),최경진(Choi Kyung-Jin),권성태(Kwon Sung-Tae) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
Air spring for railway rolling-stock is a part of secondary suspension system which play the role of supporting load. damping vibration. Recently, air springs are actively applied to railway rolling-stock to substitute coil spring with upgrading the manufacturing skill. This study is started to get the fundamental datum related to air spring for the purpose of developing the test draft for air spring. To analyze the performance of air spring, we conducted the simulation for railway rolling-stock applied air spring and tested train in convention lines. Thus, we have obtained useful datum to develop the test draft for air spring. Here, we describe some results.
허현무(Hyun-moo Hur),서정원(Jung-won Seo),김재훈(Jae-hoon Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
For the improvement of a conventional train's speed, tilting train is under the development aiming for a maximum speed 180km/h. Compared to an existing conventional rolling-stock, tilting train could take an advantage of between 20% and 30% of speed improvement on curve sections due to the improvement of curving performance. However, this improvement creates a severe load at wheels and results in the damage of its wheel and rail, relative to the operating condition of an existing rolling-stock. Consequently, it is efficient to develop a wheel profile for tilting train to minimize its damage and satisfy the current operating qualification. This thesis presents the design of wheel profile for tilting train to prevent its damage. Conducting the geometrical contact analysis, dynamic analysis, and contact stress analysis, the effect of proposed wheel profile had been examined compared to the performance of an existing wheel profile.
허현무(Hyunmoo Hur),박준혁(Joonhyuk Park),유원희(Wonhee You),박태원(Taewon Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The critical speed of railway bogie relating to the stability of the railway rolling-stock is important. The dynamic performance of bogie is tested on the roller rig in a laboratory in place of field testing on track. This roller rig is composed of two rollers equivalent to track and used to test the dynamic characteristics of vehicle. But, the test on the full scale roller rig caused many problems relating to test costs, test time. To overcome these problems, the scale roller rig is used for the convenience of test effectively. But the creep coefficient relating to creep force calculation have an effect on the stability of the scale bogie. In this paper, we have studied the scale model of roller rig and analyzed the stability of the scale bogie according to the creep coefficient calculation.