접촉해석에 의한 철도차량용 제동패드의 형상 최적화
Topology Optimization of Railway Brake Pad by Contact Analysis
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To stop a high speed train running at the speed of 300 km/h, the disc brake for the train should beable to dissipate enormous kinetic energy of the train into frictional heat energy. Sintered pin-type metals aremostly used for friction materials of high speed brake pads. A pad comprises several friction pins, and the topology,length, flexibility, composition, etc. have a great influence on the tribological properties of the disc brake. In this study, the topology of the friction pins in a pad was our main concern. We presented the optimization ofthe topology of a railcar brake pad with nine-pin-type friction materials by thermo-mechanical contact analysis. We modeled the brake pad with/without a back plate. To simulate a continuous braking, the pad or friction materialswere rotated at constant velocity on the friction surface of the disc. We varied the positions of the nine frictionmaterials to compare the temperature distributions on the disc surface. In a non-optimized brake pad, thedistance between two neighboring friction materials in the radial direction from the rotational center of the discwas not equal. In an optimized pad, the distance between two neighboring friction materials in the radial directionwas equal. The temperature distribution on the disc surface fluctuated more for the former than the latter. Optimizingthe pad reduced the maximum temperature of the brake disc by more than 10%.
Abstract
To stop a high speed train running at the speed of 300 km/h, the disc brake for the train should beable to dissipate enormous kinetic energy of the train into frictional heat energy. Sintered pin-type metals aremostly used for friction materials of high speed brake pads. A pad comprises several friction pins, and the topology,length, flexibility, composition, etc. have a great influence on the tribological properties of the disc brake. In this study, the topology of the friction pins in a pad was our main concern. We presented the optimization ofthe topology of a railcar brake pad with nine-pin-type friction materials by thermo-mechanical contact analysis. We modeled the brake pad with/without a back plate. To simulate a continuous braking, the pad or friction materialswere rotated at constant velocity on the friction surface of the disc. We varied the positions of the nine frictionmaterials to compare the temperature distributions on the disc surface. In a non-optimized brake pad, thedistance between two neighboring friction materials in the radial direction from the rotational center of the discwas not equal. In an optimized pad, the distance between two neighboring friction materials in the radial directionwas equal. The temperature distribution on the disc surface fluctuated more for the former than the latter. Optimizingthe pad reduced the maximum temperature of the brake disc by more than 10%.
참고문헌 (8)
- 김영규, "도시철도 고속화에 대비한 금속계 소결마찰재에서의 흑연 형상 및 비율에 따른 마찰특성 연구", 한국윤활학회지, 29(4), pp.242~247 (2013), 한국윤활학회[DOI]
- Belhocine, A, "Thermal-mechanical coupled analysis of a brake disc rotor", Heat and Mass Transfer, 49, pp.1167~1179 (2013)
- Belhocine, A, "Thermal analysis of a solid brake disc", Applied Thermal Engineering, 32(32), pp.59~67 (2012)
- Dufrénoy, P, "Damage mechanisms and thermomechanical loading of brake discs", European Structural Integrity Society, 29, pp.167~176 (2002)
- Ghadimi, B, "Thermal analysis of locomotive wheel-mounted brake disc", Applied Thermal Engineering, 51(1-2), pp.948~952 (2013)
- Wang, G, "Impact of brake pad structure on temperature and stress fields of brake disc", Advances in Materials Science and Engineering, 2013 (2013)
- "ABAQUS User’s Manual Ver. 6.5", ~ (2009)
- "UIC Code 541-3, Brakes - Disc brakes and their application - General conditions for the approval of brake pads", international Union of Railways, ~ (2010)