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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(Hyun-Moo Hur),박준혁(Joon-Hyuk Park),김민수(Min-Soo Kim),유원희(Won-Hee You),박태원(Tae-Won Park) 한국철도학회 2007 한국철도학회논문집 Vol.10 No.6
철도차량용 대차의 한계 성능에 대한 검증은 설계 검증및 안전성 확보관점에서 매우 중요하다. 차량의 안정성과 관련된 대차의 임계속도는 차량 개발 단계에서 통상 주행시험대를 이용하여 시험을 수행한다. 그러나 실물 대차를 이용한 시험과정에서 다양한 시제차량 제작및 시험 조건 설정의 어려움, 시험 소요시간의 과다 등에 의한 단점을 내포한다. 따라서 철도 선진국등에선 과거 오래전부터 축소모델을 이용한 차량 개발 연구가 활발하였다. 따라서 본 연구에서는 대차의 임계속도및 동적 거동 분석을 위하여 상사기법을 적용한 축소대차를 제작하였고 이를 시험하기 위한 축소 주행 시험대를 개발하였다. 축소대차 임계속도에 대한 수치해석을 수행하였으며 주행시험대상에서의 임계속도 시험을 통하여 해석결과가 시험결과에 부합함을 확인할 수 있었다. The critical speed of railway bogie is very important in terms of the verification of the vehicle design procedure and safety. The dynamic performance of bogie is tested on the railway roller rig in a laboratory in place of field testing on track. But, the testing on the full scale roller rig caused many problems relating to test costs, test time and has the difficulty in test condition setup. To overcome these problems, scaled models were used in the filed of railway vehicle design and test. In this paper, we have studied the critical speed of scaled bogie model. We have made the 1/5 scaled bogie, the scaled roller rig and analyzed the critical speed of the scaled bogie through the numerical simulation and running test of the scaled bogie. We have confirmed that the analysis results of the critical speed correspond with the test 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(Hyun-Moo Hur),박준혁(Joon-Hyuk Park),김남포(Nam-Po Kim),유원희(Won-Hee You) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Recently, high speed train became the mainstream of the public transportation in Korea. Thus ride quality level of the passengers or train drivers is important in the viewpoint of ride comfort. In this paper, we evaluated the ride levels of high speed train. We measured the carbody accelerations for power car and passenger coach of high speed train and evaluated ride levels. As test results, the ride level of power car is higher than that of passenger coach. We think that this result is caused by primary and secondary suspension structure of the bogie system. We expect that these test results is useful in the area of bogie suspension design of railway vehicle.