• Proceedings of the KSR Conference
• /
• 2000.05a
• /
• pp.143-150
• /
• 2000

Like conventional railways, improving running performance of vehicle in curve is more effective than improving maximum speed to reduce traveling time. But some vehicles have problems concerning running performance in cure because of insufficient study for our conventional railway characteristics. So, these problems brought about increasement of maintenance cost. This study was started to deliberate several plans to solve problems concerning running performance in curve. Some modifications of primary suspension and tests were carried out to improve curve negotiation. Here, we describe some results.

• Proceedings of the KSR Conference
• /
• 2006.11a
• /
• pp.135-144
• /
• 2006

To investigate various running performances of the magnetic levitation train systematically, the performance evaluation system based on Modeling & Simulation(M&S) technology is demanded essentially When the VR(virtual reality) techniques are involved, we can not only evaluate the M&S results more effectively and realistically, but also make optimum engineering decision. At the viewpoint of visualization of core engineering data like the train's running performance, there are no many cases of study which provide optimum decision information with the maximized reality and immersion environments through computer user interactions. In this study, the running performance simulation system which provides the VR based 3-dimensional visual information from the M&S results is being developed.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2010.11a
• /
• pp.1033-1034
• /
• 2010

• Wind and Structures
• /
• v.25 no.1
• /
• pp.63-77
• /
• 2017

When railway vehicles run by towers of long span bridges, the railway vehicles might experience a sudden load-off and load-on phenomenon in crosswind conditions. To ensure the running safety of the railway vehicles and the running comfort of the passengers, some studies were carried out to investigate the impacts of sudden changes of aerodynamic loads on moving railway vehicles. In the present study, the aerodynamic coefficients which were measured in wind tunnel tests using a moving train model are converted into the aerodynamic coefficients in the actual scale. The three-component aerodynamic loads are calculated based on the aerodynamic coefficients with consideration of the vehicle movement. A three-dimensional railway vehicle model is set up using the multibody dynamic theory, and the aerodynamic loads are treated as the inputs of excitation varied with time for kinetic simulations of the railway vehicle. Thus the dynamic responses of the railway vehicle passing by the bridge tower can be obtained from the kinetic simulations in the time domain. The effects of the mean wind speeds and the rail track positions on the running performance of the railway vehicle are discussed. The three-component aerodynamic loads on the railway vehicle are found to experience significant sudden changes when the vehicle passes by the bridge tower. Correspondingly, such sudden changes of aerodynamic loads have a large impact on the dynamic performance of the running railway vehicle. The dynamic responses of the railway vehicle have great fluctuations and significant sudden changes, which is adverse to the running safety and comfort of the railway vehicle passing by the bridge tower in crosswind conditions.

• Proceedings of the KSR Conference
• /
• 2003.10b
• /
• pp.477-482
• /
• 2003

The railway bridges on the new high-speed line are the first structures designed and constructed by our local engineers for high-speed running. In securing running stability and riding comfort in high-speed running, it is very important to verify the performance of structures and local specifications and design criteria by measuring and analyzing the dynamic behavior of main structural members. In this study, 4 different types(simple-span, 2, 3, 4-continuous spans) of PCS Box bridges on the test line(Yongwa$\~$Simok section) were selected, each representing a different type of superstructures, in order to verify the performance of the bridges by measuring dynamic responses during the test-run of KTX. Reviews of the running stability and the riding comfort were carried out with the results of the measurement and the analyses of vibration acceleration, endrotation, distortion and deflection at midspan.

• Proceedings of the KIEE Conference
• /
• 2006.07b
• /
• pp.1099-1100
• /
• 2006

The running of the electric train are done by powering, breaking and coasting. Powering to start and accelerate the rolling stock means driving the three-phase electric induction motors controlled by VVVF inverters which are connected to overhead power line directly(DC) or indirectly(AC, DC/AC). Breaking is achieved by blending control which is the proportional combination between regenerative breaking of VVVF inverter and air pressure control of breaking operating unit(BOU). Therefore, Data obtained during two operation are very important items to evaluate the running performance of RS. This paper has investigated in real time data acquired from VVVF inverter and measured by pressure sensor directly connected to air breaking line(motor car and trailer car). By analyzing data in the region of time and frequency, fundamental methods for eavaluating the running performance of RS quantitatively and objectively have been suggested.

• Journal of Navigation and Port Research
• /
• v.33 no.9
• /
• pp.603-608
• /
• 2009

In this paper, a 3m-class free running model ship will be introduced with its manoeuvring performance experiments. The results of turning circle test and zig-zag test will be explained. The developed system are equipped with GPS, main control computer, wireless LAN, IMU (Inertial Measurement Unit), self-propulsion propeller and driving rudder. Its motion can be controlled by RC (Radio Control) and wireless LAN from land based center. Automatic navigation is also available by pre-programmed algorithm. The trajectory of navigation can be acquired by GPS and it provides us with important data for ship's motion control experiments. The results of manoeuvring performance experiment have shown that the developed free running model ship can be used to verify the test of turning circle and zig-zag. For next step, other experimental researches such as ship collision avoidance system and automatic berthing can be considered in the future.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.10a
• /
• pp.273-276
• /
• 2004

Dynamic model of the Korea standardized rubber-tired AGT light rail vehicle, and boundary conditions between vehicle and infrastructures (running track, guidance rail) were defined to analyze vehicular vibration behaviors occurred at the worst condition for straight running track. Using the commercialized software RecurDyn, resultant forces and vibration accelerations of car body and bogies were analyzed. Based on the Korea performance test criteria for urban transit, vertical and lateral vibration of car body were calculated and evaluated as wearing condition of guide wheels. And resultant forces between bogie guidance frame and guide rail in straight running track were analyzed. As the results, the Korea standardized rubber-tired AGT light rail vehicle satisfied the performance criteria and design requirement .

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2009.06a
• /
• pp.478-479
• /
• 2009

The HEMU-400X(High-speed Electric Multiple Unit 400km/h eXperimental) project starts in 2007. It is required to analysis and simulate the train performance throughout the project life cycle for a successful completion of the project. This paper is devoted to the development of a train performance analysis model for the high-speed electric multiple unit 400km/h experimental. The model consist of running resistance model, train model, traction model and braking model. So, this paper represents the results of the train performance analysis.

• Journal of English Language & Literature
• /
• v.64 no.1
• /
• pp.77-94
• /
• 2018

This paper examines William and Ellen Craft's Running a Thousand Miles for Freedom (1860)-a narrative of the enslaved couple's escape from Macon to Philadelphia in the guise of a white male master and a colored slave. Expanding Judith Adler's notion of "travel as performed art," my reading of Running focuses on the Crafts' stratagems of transvestism-crossing boundaries not only of gender, but also of race, class, and disability. If travel can be understood as a form of performed art, then why not address a traveler as a performance artist? I present William and Ellen's role-playing in Running as performers of crossing borders and categories, or, as "fugitive performers," since the couple's story never reaches its final arrival but narrates an eternal run-away, far more than "a thousand miles to freedom." Using social stereotypes of race and gender to disguise, William and Ellen plot, write, choreograph, play, and recite on the moving stages and manipulate the others-especially white American audiences-who accompany the couple's run-away and those who were responsible for the cultural drama-a tragedy of American slavery. Becoming "fugitive performers," William and Ellen de-essentialize and debunk the nineteenth-century America's firm belief in distinct color line between black and white, and in the high yet unstable bars between male / female, abled / disabled, master / slave, and freedom / slavery. The Crafts alert their contemporaries and readers by presenting the complex and permeable boundaries of race, gender, class, social and cultural ability.