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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean society for railway
Journal Basic Information
Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 4, Issue 4 - Dec 2001
Volume 4, Issue 3 - Sep 2001
Volume 4, Issue 2 - Jun 2001
Volume 4, Issue 1 - Mar 2001
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Dynamic Characteristics of Automated Guideway Transit (AGT) Vehicles
Journal of the Korean society for railway, volume 4, issue 1, 2001, Pages 1~8
In this paper, the dynamics and stability of the automated guideway transit (AGT) vehicles with rubber tires are investigated. Two types of AGT systems are considered: the bogie-type and steering-type systems. The critical speeds for the dynamic instability of lateral and yawing motions are investigated by use of the Routh-Hurwitz's stability criterion. It is shown that the bogie-type AGT vehicles are likely to be stable within the range of practical operating speed, whereas it is not true for the steering-type AGT vehicles. It is also shown that the control performance of steering-type AGT vehicles can be improved by choosing proper steering gains of the closed-loop steering control system.
The allowable sound levels of major noise sources for the indoor-noise requirements of KHST
Journal of the Korean society for railway, volume 4, issue 1, 2001, Pages 9~15
It is required that the indoor-noise level of KHST (Korean High Speed Train) should be lower than 66 dB(A) at 300 km/h. In this study, the indoor-noise level of KHST has been predicted to determine the maximum allowable sound power levels of major noise sources. It is found that the indoor-noise requirements for KHST can be met by increasing the transmission losses of the floor and side-wall structures as well as by lowering the sound power levels of the major noise sources.
Comparison of Harmonic Compensation Based on Wound/Squirrel-Cage Rotor Type Induction Motors With Flywheel
Journal of the Korean society for railway, volume 4, issue 1, 2001, Pages 16~22
This paper describes two different systems which can compensate harmonic currents generated in the power system. As non-linear loads increase gradually in industry fields, harmonic current generated in the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration, noise in the power machinery. Many approaches have been applied to compensate harmonic currents generated in the power network system. Among various approaches, in this paper, two kinds of approaches are compared and evaluated. They are flywheel compensator based on secondary excitation of wounded rotor induction motor(WRIM) and primary excitation of squirrel cage induction motor(SCIM). Both systems have a common structure. They use a flywheel as a energy storage device and use PWM inverters.
A Study on Damping Value of Bridge in High-speed Railway
Journal of the Korean society for railway, volume 4, issue 1, 2001, Pages 23~30
The dynamic characteristics such as natural frequency, mode shape and damping ratio are most important parameters in the high-speed railway bridges rather than general roadway bridges. Also, the need to know the dynamic behavior of bridges greatly increased in recent years. In the early of 1990s, to design the high-speed railway bridges, damping ratio recommended in general code was 2.5～7.5%. However, these values were not applied in all cases. Therefore, obtaining the damping value of specific structures is important to get the correct variable for design of high-speed railway bridges. The purpose of this study is mainly to obtain the damping ratio of high-speed railway bridges. The average damping ratio of high-speed railway bridges evaluated from a field test is about 2.4%.
A Study on the Railway noise reduction according to improvement of rail joint
Journal of the Korean society for railway, volume 4, issue 1, 2001, Pages 31~37
There are three examples of noise reduction test by joint improvement. One of them is tested for electric car at joint rail and another is tested at expansion joint and long welded rail and the third is tested at open deck bridge. We can know from the result that the noise reduction effect of rail welding is very different to the type of track and the car. The condition of the test has some differences, but it may be useful reference of noise reduction