Recently, aluminium extruded panel is widely used in a high speed train for increasing bending stiffness and weight reduction. This aluminium extruded panel shows the largest contribution in the sound transmission loss (TL) of the floor and side wall. However, comparing with the flat panel having the same weight, TL of the aluminium extruded panel falls remarkably around the local resonance frequency, which is determined by the dimension of the core structure. In this study, we try to change the local resonance frequency by modifying the core structure. Increasing or decreasing the thickness, angle and span in the core, change of the local resonance frequency and change of the overall natural frequency are investigated by finite element analysis, and effect of local resonance on TL is examined. The purpose of the study is to design more effective core structure for the sound insulation performance of the aluminium extruded panel.
This paper describes a crashworthy design for the front structure of KHST (Korean High Speed Train) under the SNCF accident scenario (Collision against a movable rigid mass of 15 tons at 110 ㎞/h), The front structure designed in a new concept shows good behaviours in crashworthy point of view. It collapses in a progressive and well-controlled fashion. To evaluate the design by considering real situations, the power-car is simulated for accidents collided against a dump truck of 15 tons at 110 ㎞/h. The front end structure of it shows a good response on crash worthiness.
The dynamic performance design of catenary-pantograph system which collects current for the next generation Korean high speed train(KHST) was considered. Used was the same dynamic model of the catenary-pantograph system as that of TGV-K which will be introduced for Kyung-bu corridor. Using the model, sensitivity analysis for design variables were made to improve dynamic performance of KHST system. The results of sensitivity analysis and performance improvement are as follows: (1) It was found that aerodynamic force, tension of contact wire, mass of contact strip, mass of supporting contact strip, mass of clamp, mass of steady arm, and stiffness of plunger were the design variables most influencing the dynamic performance of the system. (2) Pantograph with reductions of 20% aerodynamic force, 34% weight of supporting contact strip, 20% spring constant of plunger, and 34% equivalent mass of steady arm was very possible system for the KHST which will be running at maximum operating speed 350 ㎞/h.
Rotating bogie frame will be used in the bogie for the Light Rail Train being developed. In develoment of the bogie, analyzed were the structural strength and fatigue characteristics of the rotating bogie frame. Defined load cases were applied for the analysis. No part of the rotating bogie frame is subjected to stress beyond the fatigue endurance limits of the material used when grinding the weldment of the lower plate link bend. It is concluded that the rotating bogie frame is considered safe in the view of the structural strength.
In this paper, studied was the application of IT and sensor technology to trains in order to provide safety and convenience for passengers. One of applications is Lavatory Emergency Detection System in a train. Since a lavatory in a train is securely separated space, it is hard to notice an emergency inside of it unless a user sends a request for help. A system that can detect an emergency by using sensors was presented. System requirements were analyzed to design and implement a system. Prototype of the system was made. Then, tests in a laboratory were carried out based on a set of test plan to verify the system functions. Performance was turned out to be very successful. The system developed may have a chance to be installed according to the requirements of specifications of the train to be ordered.
In a high speed train, aluminium extruded panel is widely used in floor, side wall and roof structures for high bending stiffness and weight reduction. However, with some inevitable reasons, aluminium extruded panel shows inferior sound insulation performance compared with the flat panel having same weight. Especially, occurrence of local resonance modes in the particular frequency band, is one of the main reason in the deterioration of the sound insulation performance. Local resonance modes are generated in the structure which consists of periodic unit structure, such as the aluminium extruded panel. The local resonance frequency is determined by the specification of the unit structure. In this study, we predict the local resonance frequency band on the aluminium extruded panel used for the high speed train, and investigate how the design modification in the unit structure influences the local resonance frequency band and panel bending stiffness. The purpose of the study is to provide the design information for the effective unit structure in order to improve the sound insulation performance of the aluminium extruded panel.
교통 시스템의 문제를 해결하기 위하여 새로 도입되는 신교통 시스템은 지금까지의 지하철과 버스와는 다른 형태이면서 다양한 조건이 요구된다. 본 논문에서는 신교통수단으로 개발을 본격화하려는 PRT 시스템에 대한 요구조건 몇 가지를 검토하였다. 검토된 요구조건 항목은 차량 당 승차인원, 차량구조, 추진시스템, 제동장치 및 분기장치이다. 각 항목에 대해서 채택할 수 있는 방식들을 분류하고, 이들의 장단점을 분석하였다. 차량 당 승차인원은 3~4인이 적절하지만, 이는 가이드웨이의 경량화에 의한 건설비 절감 및 요금정책 등에 지배를 받으므로 좀 더 면밀한 검토가 필요함을 알았다. 차량의 구조는 I형이 장기적인 관점에서 유리하다. 추진장치로는 선형전동기가 적절하며, 선형전동기는 가이드웨이에 설치하지 말고 차량에 탑재되어야 한다. 제동장치는 전기제동을 주 제동장치로 하고 다중시스템으로 Fail-Safe 기능을 갖도록 설계되어야 한다. 분기장치는 차량에 탑재된 기계식이 적절함을 알 수 있었다. 앞으로 개발할 PRT의 사양을 결정함에 있어서 이러한 방식들에 대한 검토결과를 바탕으로 사양이 선정되어야 한다.
'%3e%3cg id='b'%3e%3cpath id='a' stroke='%23000' stroke-width='2' d='M-6-25H6m-12 3H6m-12 3H6'/%3e%3cuse xlink:href='%23a' y='44'/%3e%3c/g%3e%3cpath stroke='%23fff' d='M0 17v10'/%3e%3ccircle r='12' fill='%23cd2e3a'/%3e%3cpath fill='%230047a0' d='M0-12A6 6 0 0 0 0 0a6 6 0 0 1 0 12 12 12 0 0 1 0-24z'/%3e%3c/g%3e%3cg transform='rotate(-123.69)'%3e%3cuse xlink:href='%23b'/%3e%3cpath stroke='%23fff' d='M0-23.5v3M0 17v3.5m0 3v3'/%3e%3c/g%3e%3c/svg%3e)