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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(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(Hur Hyun-Moo),유원희(You Won-Hee),박태원(Park Tae-Won) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The suspension system of railway rolling-stock is composed of the primary and secondary suspension elements. Recently, a conical rubber spring is widely used as the primary suspension element due to the merits of the three directional stiffness characteristics. So, understanding the properties and characteristics of the conical rubber spring is very important from the viewpoint of vehicle stability and efficient maintenance. Thus, this study is started to acquire the basic data for maintaining spring elements efficiently. For this, we tested the conical rubber spring samples including a new and old specimen with aging. As a test result, we have obtained the property characteristics of the aged spring comparing with the new product and we describe the results.
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(Hur Hyun-Moo),박준혁(Park Jun-Hyuk),유원희(You Won-Hee),박태원(Park Tae-Won) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The performance of the railway bogie is classified into the stability and the steering performance. Testing for the bogie stability is conducted on the roller rig. But testing for the bogie steering performance on test facility is very difficult, so the testing for the vehicle curving performance is conducted on the real curve track. And it is desirable to test on the full scale test rig, but it caused many problems relating to test costs, test time. To overcome these problems, the small scale test rig is actively used in the field of bogie stability. Thus, in this paper, we have studied the scale track to test the bogie steering performance. For this, we designed the 1/5 scale test track equivalent to radius 200 curve and confirmed the validity of the testing for the bogie steering performance on the scale curve track through the testing using 1/5 scale bogie.
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(Hyun Moo Hur),안다훈(Da Hoon Ahn),김남포(Nam Po Kim),심경석(Kyung Seok Sim),박태원(Tae Won Park) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.9
Lateral force of wheel is important parameter when we evaluate the safety of a railway vehicle on curved track. The lateral force of wheel is influenced by the steering performance of wheelsets. Generally, in passive type vehicles, the steering performance of wheelsets is influenced by the parameters like primary spring stiffness, wheel base, conicity of the wheel profile, etc. But, the steering performance of passive type vehicle has its limit. To overcome the limit of the steering performance of passive type vehicle, active steering technology is being developed. In this paper, we analyze the lateral force of wheel and the safety of the railway vehicle on curved track by adopting the active steering technology. As results of dynamic analysis for vehicle model equipped with active steering system, the lateral force of wheel is reduced and the safety is improved remarkably.
Wheelset Steering Angle of Railway Vehicle according to Primary Suspension Property
허현무(Hyun Moo Hur),안다훈(Da Hoon Ahn),박준혁(Joon-Hyuk Park) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.7
In this paper, we studied the steering performance of wheelset with primary suspension characteristics of railway vehicle. We carry out dynamic analysis and experimental study for the vehicle models which are different primary suspension characteristics. The steering angle of a vehicle model (Case 1) operating in domestic subway lines is insufficient compared with an objective steering angle for curved track. And the steering angle of a vehicle model (Case 2) with improved self-steering performance of wheelset is a little improved compare to previous vehicle model. But also Case 2 model is still insufficient compared with an objective steering angle and has its limit in steering performance. So to overcome this limit of steering performance of passive type railway vehicle, an active steering technology is being developed. In case of vehicle model with active steering system, the steering performance is improved remarkably compared to passive type vehicle model.