도시철도차량 제동시스템 설계를 위한 제동마찰재의 특성 분석
Analysis of Friction Material Characteristics for Brake System Design of Urban Railway Vehicles
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초록
본 연구에서는 다이나모시험 결과를 이용하여 도시철도 전동차에 적용되는 공기 제동장치의 제동슈와 제동패드의 마찰 특성을 분석하였다. 압부력, 제동속도에 따른 마찰계수, 온도 상승 등을 분석하였고 제동속도에 따른 마찰계수를 추정하였다. 제동슈은 제동패드에 비해 마찰계수의 변동성이 크고 제동속도가 낮을수록 마찰계수가 증가하는 특성을 나타내었다. 추정한 마찰계수, 차량제원, 실차시험을 통한 제동압력을 이용하여 전동차 제동시의 열차 길이방향 제동 시뮬레이션을 수행하였다. 마찰계수 특성의 분석 결과는 국내 전동차의 마찰재의 표준화에 적용될 수 있을 뿐 아니라 제동설계의 기초자료로 활용할 수 있을 것으로 예상된다.
Abstract
In this study, the friction characteristics of the brake shoe and the brake pad of the pneumatic brake system applied to the urban railway electric multiple unit were analyzed using the dynamo test results. The friction coefficient, instability, temperature rise, etc. were analyzed according to pressure, braking speed, and friction coefficient was estimated. The brake block showed a higher coefficient of friction than the brake pad and increased friction coefficient as the braking speed was lower. Longitudinal braking dynamics analysis of train braking was performed using the estimated friction coefficients, vehicle specifications, and brake pressures from actual vehicle tests. The results of the analysis of friction coefficient characteristics are expected not only to be applied to the standardization of friction materials of domestic electric vehicles but also to be used as basic data for brake design.
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