Design and analysis of magnetorheological dampers for train suspension.

Lau Yiu Kee.Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.Includes bibliographical references (leaves 142-146).Abstracts in English and Chinese.LIST OF TABLES --- p.viiiLIST OF FIGURES --- p.xChapter 1. --- INTRODUCTION --- p.1Chapter 1.1 --- Motivation --- p.1Chapter 1.2 --- Railway Vehicle Suspension --- p.2Chapter 1.3 --- Semi-Active Magnetorheological Fluid Damper --- p.3Chapter 1.4 --- Research Objectives --- p.4Chapter 1.5 --- Thesis Outline --- p.5Chapter 2. --- BACKGROUND --- p.7Chapter 2.1 --- MR Fluids --- p.7Chapter 2.1.1 --- Composition of MR fluids --- p.7Chapter 2.1.2 --- Properties and characteristics of MR fluids --- p.8Chapter 2.1.3 --- Literature review --- p.13Chapter 2.2 --- MR Devices --- p.13Chapter 2.2.1 --- Advantages of MR devices --- p.13Chapter 2.2.2 --- Common device geometries --- p.14Chapter 2.2.3 --- MR fluid based applications --- p.15Chapter 2.2.4 --- Literature review --- p.19Chapter 2.3 --- Overview of Railway Vehicles --- p.21Chapter 2.3.1 --- "Passive, active and semi-active suspensions" --- p.21Chapter 2.3.2 --- Basic railway vehicle structure --- p.23Chapter 2.3.3 --- Literature review --- p.25Chapter 2.4 --- Railway Vehicle Suspension Systems --- p.25Chapter 2.4.1 --- Primary vertical suspension --- p.25Chapter 2.4.2 --- Secondary vertical suspension --- p.27Chapter 2.4.3 --- Secondary lateral suspension --- p.27Chapter 2.4.4 --- Yaw suspension --- p.28Chapter 3. --- DESIGN CONSIDERATIONS FOR MR DAMPERS --- p.29Chapter 3.1 --- Overview of Existing MR Dampers --- p.29Chapter 3.1.1 --- Monotube MR fluid damper --- p.29Chapter 3.1.2 --- Double-ended MR damper --- p.31Chapter 3.1.3 --- Bellow type MR damper --- p.35Chapter 3.2 --- Optimal Design and Configuration of Magnetic Circuit --- p.35Chapter 3.2.1 --- Magnetic circuit and magnetic field orientation --- p.35Chapter 3.2.2 --- Physical dimension of MR damper --- p.38Chapter 3.2.3 --- Connection polarity of electromagnetic circuit --- p.40Chapter 3.3 --- Basic Geometry Design Considerations --- p.43Chapter 3.3.1 --- Controllable force and dynamic range --- p.43Chapter 3.3.2 --- Geometry constraints --- p.45Chapter 3.3.3 --- Magnetic circuit design --- p.47Chapter 4. --- DEVELOPMENT AND FABRICATION OF MR DAMPERS --- p.51Chapter 4.1 --- Pneumatic Air Cylinder --- p.51Chapter 4.2 --- Fabrication Process of Double-Ended MR Dampers --- p.55Chapter 4.2.1 --- Modifications on the pneumatic air cylinder --- p.55Chapter 4.2.2 --- Manufacturing processes of the piston sleeve --- p.56Chapter 4.2.3 --- Modification processes of the original piston rod --- p.59Chapter 4.2.4 --- Modification of the piston staging area --- p.60Chapter 4.2.5 --- Copper wire wrapping and damper assembling --- p.63Chapter 5. --- EXPERIMENTAL SETUP AND RESULTS --- p.66Chapter 5.1 --- Experimental Setup for the Double-Ended MR Damper --- p.66Chapter 5.1.1 --- Instron 8801 loading machine --- p.66Chapter 5.1.2 --- Experimental setup for testing the MR damper --- p.67Chapter 5.2 --- Force-Lag Phenomenon of MR Damper --- p.70Chapter 5.2.1 --- Force-lag phenomenon --- p.70Chapter 5.2.2 --- Reasons of the force-lag phenomenon --- p.73Chapter 5.2.3 --- Methods to eliminate the force-lag phenomenon --- p.76Chapter 5.2.4 --- Setup for hydraulic pump system --- p.77Chapter 5.2.5 --- Results and effects of the pressurized MR damper --- p.79Chapter 5.3 --- Experimental Results for Testing the MR Damper --- p.83Chapter 6. --- SIMULATION RESULTS OF SEMI-ACTIVE TRAIN SUSPENSION --- p.87Chapter 6.1 --- MR Damper Model --- p.87Chapter 6.2 --- Rail Vehicle Model --- p.92Chapter 6.3 --- Semi-Active Railway Suspension --- p.94Chapter 6.3.1 --- Lateral vibration on the train --- p.94Chapter 6.3.2 --- Semi-active control strategy --- p.95Chapter 6.4 --- Simulation Results --- p.98Chapter 6.4.1 --- Lower sway mode excitation --- p.99Chapter 6.4.2 --- Upper sway mode excitation --- p.105Chapter 6.4.3 --- Mixed sway mode excitation --- p.110Chapter 6.4.4 --- BR high speed assault course --- p.116Chapter 6.4.5 --- Discussions --- p.124Chapter 6.5 --- Effects of Vibration on Ride Comfort --- p.128Chapter 7. --- CONCLUSIONS --- p.134APPENDIX --- p.136BIBLIOGRAPHY --- p.14