声明
TABLE OF CONTENTS
ABSTRACT
摘要
CHAPTER 1 INTRODUCTION
1．1 Motivation and Challenges
1．2 Research objectives and contents
1．3 The significances of research
1．4 Research Approach
1．5 The outline of the dissertation
References
CHAPTER 2 BACKGROUND AND LITERATURE REVIEW
2．1 The damages of tractor vibration
2．2 Survey of agricultural vehicle suspension system
2．2．1 Analysis of the directions of tractor vibration
2．2．2 Vehicle suspension research and developmental process
2．2．3 The basic research of tractor vibration
References
CHAPTER 3 STUDY ON THE VERTICAL STIFFNESS AND DAMPING COEFFICIENT OF TRACTOR TIRE USING SEMI-EMPIRIUCAL MODEL
Abstract
3．1．Introduction
3．2．Measurement method and test rig
3．2．1 The principle of testing
3．2．2 Test rig and measurement system
3．2．3 Test procedure
3．3．Results and discussion
3．4．Conclusions
References
CHAPTER 4 STUDY ON CHARACTERISTICS OF VERTICAL EQUIVALENT STIFFNESS AND DAMPING OF TRACTOR TIRE-SOIL SYSTEM USING SEMI-EMPIRICAL MODEL
Abstract
4．1 Introduction
4．2．Materials and method
4．2．1 Soil and tractor tire preparation
4．2．2 Measurement method and test rig
4．3 Results and discussion
4．3．1 Variation of the vertical equivalent damping ratio of tire-soil system with different tire inflation pressure and soil depth
4．3．2．Variation of the vertical equivalent damping of tire-soil system with different soil moisture content
4．3．3 Establishing new tire-soil model
4．3．4 The vertical equivalent stiffness and damping coefficient of tire-soil system for tire T1＆T2
4．4 Conclusions
References
CHAPTER 5 MEASUREMENT OF PADDY FIELD SURFACE ROUGHNESS
Abstract
5．1 Introduction
5．2 Description of terrain surface profiles
5．3 Materials and method
5．3．1 Test rig design
5．3．2 Principle of measurement
5．3．3 Processing and analytical data
5．4 Results and discussion
5．5 Conclusion
References
CHAPTER 6 SIMULATION OF VIBRATION CHARACTERISTICS OF THE UNSUSPENDED TRACTOR TRAVELING ON THE PADDY FIELD
Abstract
6．1 Introduction
6．2 Determination of vibration parameters of the tested tractor
6．2．1 The main technical parameters of tested tractor
6．2．2 Empirical determination of parameters of mass attributes the tested tractor systems
6．2．3 Determination of parameters of tractor tire-soil system
6．2．3 Model of excitation of random road profile in time domain
6．3 1／2 unsuspended paddy tractor model
6．3．1 Equations of Motion
6．3．2 Body vibration analysis
6．4 Simulation results and analysis
6．5 Conclusions
References
CHAPTER 7 EXPERIMENTAL STUDY ON VIBRATION CHARACTERISTICS OF AN UNSUSPENDED PADDY TRACTOR
Abstract
7．1．Introduction
7．2．Materials and methods
7．2．1．Test tractor
7．2．2．Instrumentation
7．2．3 Test conditions and treatments
7．2．4 Analytical method
7．3．Results and discussion
7．3．1 Variation of the RMS value of acceleration at 48．3％ field soil moisture content
7．3．2 Variation in the RMS acceleration values at 62．4％ field soil moisture content
7．3．3 Comparison of the RMS acceleration values between 48．3％ and 62．4％ field soil moisture content
7．3．4 Comparison between simulation and experimental results
7．4．Conclusions
References
CHAPTER 8 CONCLUSIONS AND RECOMMENDATIONS
8．1 Conclusions
8．2 Recommendations
APPENDICES
ACKNOWLEDGEMENTS
REAEARCH PAPERS
