도시철도차량 비석면 유기제동패드의 주요 성분에 따른 마찰계수 특성 분석
Characteristic Analysis of Friction Coefficient According to Major Components of Non-asbestos Organic Brake Pads for Urban Railway Vehicles
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본 논문은 도시철도차량에 적용되는 비석면 유기 제동패드의 성분과 마찰계수에 관한 상관관계를 시험을 통하여 분석한 결과를 나타낸 것이다. 다양한 배합비율을 갖는 5가지 제동패드에 대하여 실제 주행하는 철도차량과 동일하게 구성한 다이나모 시험기를 통하여 반복시험을 하였고 마찰재의 주요 성분별로 마찰계수에 미치는 영향을 분석하였다. 마찰재의 성분비율에 관계없이 제동속도가 낮을수록 마찰계수의 산포가 넓어지는 경향을 보였다. 특정 철과 같은 성분은 함유량에 따라 너무 많거나 적어도 마찰계수를 높이는 경향을 보였으며 탄소와 같은 성분은 많을수록 마찰계수를 낮추는 효과를 보였다. 본 연구의 결과는 철도차량에 적용되는 마찰재의 특성을 개선하여 안전운행에 도움을 주고 철도 부품 제작사에는 배합비율과 시험에 따라 시험하기 때문에 수개월에서 수년이 걸리기는 시간과 반복 시험에 따른 비용을 절감시킬 수 있을 것으로 판단된다.
Abstract
This paper presents the results of an analysis of the correlation between the components of braking pads applied to urban railway vehicles and the coefficient of friction. For the five brake pads composed of various components, tests were performed by the dynamometer configured the same as the actual railway vehicle and analyzed the effect on the coefficient of friction for each major component of the friction material. Regardless of the component proportions of the friction material, the lower the initial braking speed, the wider the spread of the friction coefficient. Components such as iron powder tended to increase the coefficient of friction at least, depending on their content, and the more ingredients such as carbon, the lower the coefficient of friction. The results of this study are thought to be able to improve the characteristics of friction materials applied to railway vehicles to help safe operation and reduce the cost of repeated testing and the time it takes months to years for railway parts manufacturers to be tested according to the mix ratio and test.
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