S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Theses (Master's Degree_기계항공공학부)
A numerical study on the effect of ski vibration on friction
스키 진동과 마찰력 사이의 상관관계 해석
- 공과대학 기계항공공학부
- Issue Date
- 서울대학교 대학원
- 학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2017. 2. 김도년.
- Friction in icy condition is a complicate phenomenon usually consisting of three representative regimes: boundary, mixed and hydrodynamic regime. 10 Various factors may affect the friction in these regimes including the thickness of water film, the amount of frictional heat, velocity and apparent contact area. In ski jump, ski plates vibrate when gliding on an icy slop, which may have an influence on the gliding performance as they can alter these factors related to friction.
Here, we present our effort to investigate the effect of vibration on friction numerically using a combined friction model applied to a jump ski. A pressure-dependent friction model is first derived from experimental data measured in small test specimen, which is well agreed with a theoretical model. Then, we construct a numerical, finite element model for a jumping ski such that it shows the same flexural stiffness as characterized experimentally. Finally, we explore how vibration affects the friction by performing simulations with various amplitudes and frequencies of vibration applied.