Design method development for the design of traction systems

摘要: ii Dedication iii Acknowledgments iv List of Tables vii Figures viii Chapter One : Motivation for Traction Design Method Development 1 1.1 Concept Problem Scope 2 1.2 Current Practice Overview 4 1.3 Systematic Engineering 11 1.4 Research Objectives: 14 1.5 Thesis 16 Two Analytical Based Modeling Approaches 17 2.1 Models Sand 2.2 Sand-Tire Interaction 26 2.3 Comparison 38 Three Simulation 44 3.1 Finite Element 3.2 Discrete 48 3.3 Combined FEM and DEM 50 3.4 52 Four Physical Prototyping 57 4.1 Up-Hill Tests 4.2 NASA Glenn 62 4.3 64 Five Methods 68