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A numerical study on the effect of ski vibration on friction
스키 진동과 마찰력 사이의 상관관계 해석

DC Field Value Language
dc.contributor.author남윤형-
dc.date.accessioned2017-07-14T03:44:44Z-
dc.date.available2017-07-14T03:44:44Z-
dc.date.issued2017-02-
dc.identifier.other000000141550-
dc.identifier.urihttps://hdl.handle.net/10371/123941-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2017. 2. 김도년.-
dc.description.abstractFriction 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.
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dc.description.tableofcontents1. Introduction 1
2. Method 4
2.1 Finite element model for jump ski 5
2.2 Definition of skier and ski boots 10
2.3 Definition of in-run track 12
2.4 Friction mechanism in icy condition 18
2.5 Parameter study for theoretical friction model in icy condition 21
2.6 Definition of external vibration 25
3. Results and Discussion 26
3.1 Static analysis 27
3.2 Dynamic analysis 30
3.2.1 Time integration method 30
3.2.2 Contact & Friction metnod in FEM 33
3.2.3 Simulation setup 36
3.2.4 Relationship between vibration mode and friction force 38
4. Conclusion 45
References 47
Abstract in Korean 52
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dc.formatapplication/pdf-
dc.format.extent1430103 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectFriction-
dc.subjectvibration-
dc.subjectFriction model-
dc.subjectJump ski-
dc.subjectFinite element model-
dc.subjectflexural stiffness-
dc.subject.ddc621-
dc.titleA numerical study on the effect of ski vibration on friction-
dc.title.alternative스키 진동과 마찰력 사이의 상관관계 해석-
dc.typeThesis-
dc.description.degreeMaster-
dc.citation.pages52-
dc.contributor.affiliation공과대학 기계항공공학부-
dc.date.awarded2017-02-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Theses (Master's Degree_기계항공공학부)
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