Not available / text

Not available / text

University of Macau / Faculty of Science and Technology / Department of Electromechanical Engineering

Lei, Man Cheong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 79-80). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iii / Table of Contents --- p.iv / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Introduction to Ureteroscope --- p.3 / Chapter 2.1. --- Ureteroscope --- p.3 / Chapter 2.2. --- Configuration of flexible ureteroscope --- p.5 / Chapter 2.2.1. --- The optical system --- p.5 / Chapter 2.2.2. --- Deflection mechanism --- p.6 / Chapter 2.2.3. --- Control wires (Guidewires) --- p.9 / Chapter 2.2.4. --- Working channel --- p.10 / Chapter 2.3. --- Problems of the existing products --- p.10 / Chapter 2.4. --- Designs of the bending section --- p.11 / Chapter 2.4.1. --- Pin-joint bending section --- p.12 / Chapter 2.4.2. --- Wire-connected bending section --- p.15 / Chapter 2.5. --- CAD Modeling of the bending section --- p.16 / Chapter 2.5.1. --- Different designs of components --- p.16 / Chapter 2.5.2. --- Configuration of the bending section --- p.17 / Chapter 3. --- Wire-Driven Deflection Mechanism --- p.19 / Chapter 3.1. --- Literature review --- p.19 / Chapter 3.2. --- Geometry modeling of the bending section --- p.21 / Chapter 3.2.1. --- Description of formulation --- p.21 / Chapter 3.2.2. --- Assumption --- p.21 / Chapter 3.2.3. --- Notation --- p.22 / Chapter 3.2.4. --- Geometric analysis --- p.22 / Chapter 3.3. --- Simulations of the motion of the deflection mechanism --- p.26 / Chapter 3.3.1. --- Construction of the simulation --- p.26 / Chapter 3.3.2. --- Controlled by a pair of wires --- p.28 / Chapter 3.3.2.1. --- For bending section composed by identical parts --- p.28 / Chapter 3.3.2.2. --- For bending section composed by two sub-sections --- p.29 / Chapter 3.3.3. --- Controlled by two pairs of wires --- p.30 / Chapter 3.3.3.1. --- Deflecting in the same direction --- p.30 / Chapter 3.3.3.2. --- Deflecting in opposite direction --- p.31 / Chapter 3.4. --- Trajectory of the distal end --- p.32 / Chapter 3.4.1. --- Bending section composing by identical parts --- p.32 / Chapter 3.4.2. --- Bending section composing by two sub-sections --- p.40 / Chapter 3.4.2.1. --- Controlled by a single pair of wires --- p.43 / Chapter 3.4.2.2. --- Controlled by two pairs of wires --- p.46 / Chapter 3.5. --- Static analysis of the deflection mechanism --- p.57 / Chapter 4. --- Application: Design of Ureteroscope --- p.64 / Chapter 4.1. --- Design of the bending section --- p.64 / Chapter 4.2. --- Design of the control body --- p.67 / Chapter 4.2.1. --- Parts introduction and major assembling --- p.68 / Chapter 4.2.2. --- Control mechanism --- p.72 / Chapter 5. --- Conclusion and Future Work --- p.75 / Chapter 6. --- Bibliography --- p.79 / Chapter Appendix A: --- List of Publication --- p.81 / Chapter Appendix B: --- MATLAB Programs V --- p.83

published_or_final_version / Mechanical Engineering / Master / Master of Philosophy

Development of a methodology of applying symbolic and computational models of conjugate geometry to several problems in design and manufacturing areas forms the basis of this study. The philosophy of this work is the development of generalized symbolic models for two-dimensional and three-dimensional conjugate geometry applications. The generalized models have been implemented using what seems to be the best tool for these kind of applications - a symbolic manipulation system. The unique feature of this research is reflected in the fruitful combination of the elegance of conjugate geometry theory and the inherent versatility of a symbolic manipulation system. The generalized conjugate geometry algorithms were programmed and run using MACSYMA. Typical cases in design of mechanisms have been studied using these symbolic programs. The manufacture of helically swept surfaces is of special interest to this work. Helically swept surfaces have been designed and three schemes of manufacturing these surfaces are presented here. Examples of these three schemes of manufacturing helically swept surfaces have been carried out using the symbolic program in MACSYMA. The results of all the examples have been presented both analytically and graphically. / Master of Science