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박준혁(Joonhyuk Park),고효인(Hyoin Koh),허현무(Hyunmoo Hur),유원희(Wonhee You),김남포(Nampo Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Unstable vibrations of railway vehicle wheels generate the curve squeal noise in tight curve. This squeal noise has to be reduced in order to increase the service quality of railway system by eliminating the main factors that make the wheel unstable. In this paper, main parameters which affect the stability of railway vehicle wheel are introduced and the stability analysis is carried out using those parameters in frequency domain. Time domain analysis is also performed. In the time domain analysis, using a conventional Korean subway vehicle model, transient time response of a wheel is analyzed when the vehicle is running in curved track. Finally, the results are compared and discussed.
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.
전동차 차륜 마모에 따른 차륜/레일 기하학적 접촉 특성 변화 분석
허현무(Hyunmoo Hur),박준혁(Joonhyuk Park),유원희(Wonhee You),박태원(Taewon Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In a railway vehicle, contact between wheel and rail is a peculiar characteristic and variations of wheel and rail profile influence on the dynamic characteristics of railway vehicle. Thus the variations of the wheel and rail profile are very important in railway dynamics. Recently a research relating to active steering to improve the curving performance of vehicle is progressing actively at home and abroad. In this field, a pre-study for the wheel/rail contact geometry is needed and especially the variation of the wheel/rail contact geometry with wheel wear is the key design parameter to develop the controller of the active steering bogie. In this paper, we have experimentally studied to analyze the variation of the wheel/rail contact geometry with wheel wear as a pre-study to develop the active steering bogie for electric multiple unit (EMU). For this, we have made an experiment with EMU operating in curving area. We have measured the wear profiles of the wheel of the test vehicle and analyzed the wheel/rail contact geometry with a mileage of the test vehicle. In experiment with test vehicle, we have got the useful data to design the steering controller of the wheelset.
허현무(Hyunmoo Hur),박준혁(Joonhyuk Park),유원희(Wonhee You),박태원(Taewon Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The critical speed of railway bogie related to the stability of the railway rolling-stock is important. Testing of the dynamic performance of bogie is conducted using a 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 geometrical characteristics of the wheel/roller contact on the roller rig are different from those of the wheel/rail contact because the longitudinal radius of roller is not infinite compared with rail. This difference has influence on the wheelset behavior and the critical speed of bogie. Therefore in this paper, we have studied the behavior of wheelset and bogie on the roller rig for railway bogie testing with the purpose of developing the scaled roller rig. As an analysis results, it has been shown that the critical speed of bogie on the roller rig is slightly lower than that of bogie on track.