Browsing by Author "Yuan-Shin Lee, Committee Chair"

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    Analysis and Fabrication of Microfluidic Systems by Excimer Laser Micromachining and Its Applications for Microfluidic and Bio-Medical Devices.
    (2010-08-12) Kim, Eui Seok; Yuan-Shin Lee, Committee Chair; Roger Narayan, Committee Member; Paul Cohen, Committee Member; Jingyan Dong, Committee Member; Jonathan Casper, Committee Member
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    Analysis of Patient-Robot Interaction Using Statistical and Signal Processing Methods.
    (2010-09-22) Swangnetr, Manida; Ezat Sanii, Committee Chair; Yuan-Shin Lee, Committee Chair; David Kaber, Committee Chair; Jeffrey Thompson, Committee Member; Gracious Ngaile, Committee Member
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    Computational Techniques to Improve Efficiency and Accuracy for High Performance Machining of Polyhedral Models
    (2003-07-01) Ren, Yongfu; Robert E. Young, Committee Member; Christopher G. Healey, Committee Member; Yuan-Shin Lee, Committee Chair; Ezat T. Sanii, Committee Member
    The objective of this research is to investigate the computational techniques to improve the machining efficiency and accuracy for machining polyhedral models in CAD/CAM systems. High performance machining can be achieved by considering part surface geometry and physical property of machining processes in roughing, finishing and clean-up machining systematically. To improve the machining accuracy, high accurate tool path interpolations are critical for CAD/CAM systems. By considering the maximal error conditions, explicit solutions are proposed to calculate the exact maximal interpolation error for interpolating 3D cubic polynomial curves and 2D planar offset curves. Using the explicit solutions of finding the maximal interpolation errors, an adaptive interpolation method is proposed for smooth curve interpolation for tool-path generation and numerical control machining. To improve the tool-path generation efficiency for machining polyhedral models, an inverse cutting profile method is proposed for constructing Generalized Cutter Location (GCL) surfaces. The GCL-surfaces consist of facet-CL-surface, edge-CL-surface and vertex-CL-surface. GCL-surface can be calculated efficiently from the developed inverse cutting profile and the derived instantaneous offset vector of the cutting tool. The finishing and clean-up machining can significantly improve the machining efficiency by using multiple-size tools. To shorten the total machining time, multiple tools are used to machine various regions with different geometric characteristics. A contraction tool method is proposed to identify the clean-up regions and to construct the strip-parallel clean-up tool paths. Using the proposed contraction tool method, clean-up tool paths can be successfully generated for improving machining efficiency. By applying High-Speed Machining (HSM), Machining efficiency can be greatly improved due to the high material removal rate in HSM. Chattering is one of the most critical problems encountered in high-speed machining. To overcome the chattering in high speed machining, a time-domain computational modeling technique is proposed for chatter prediction. The time-domain computational modeling of chatter prediction is based on the trochoidal link-list surface models and Poincarè plot chatter criterion techniques. Compared with the traditional analytic solutions, the proposed time-domain chatter prediction solution can successfully generate the instant cutting information and can efficiently deal with non-linearity cutting in high-speed machining. The presented techniques have been implemented and tested for feasibility. Computed implementation and practical examples are presented in this paper. The results show that the developed computational techniques can significantly improve the machining performance of complex polyhedral models. The presented techniques and detailed algorithms can be used in CAD/CAM/CNC systems for high performance machining.
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    Development of a Haptic-based Rey-Osterrieth Complex Figure Testing and Training System with Computer Scoring and Force-feedback Rehabilitation Functions.
    (2010-05-06) Li, Yingjie; David Kaber, Committee Chair; Yuan-Shin Lee, Committee Chair; Christopher Healey, Committee Member; Simon Hsiang, Committee Member; Larry Tupler, Committee Member; Robert St. Amant, Committee Member
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    Laser Micromachining and Its Applications in Manufacturing of Micro Medical Devices
    (2009-11-05) Ren, Deyao; Yuan-Shin Lee, Committee Chair; Thomas L. Honeycutt, Committee Member; Robert Young, Committee Member; Roger Narayan, Committee Co-Chair
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    Virtual Sculpting and Polyhedral Machining Planning System with Haptic Interface
    (2004-10-31) Zhu, Weihang; Christopher Healey, Committee Member; Robert Young, Committee Member; Ezat Sanii, Committee Member; Yuan-Shin Lee, Committee Chair
    This research proposes the methodology of a novel haptic sculpting and machining planning system for virtual prototyping and manufacturing. A lab-built 6-DOF (degree of freedom) input and 5-DOF output haptic interface system is utilized in the proposed haptic sculpting and machining planning system. A dexel-based haptic virtual prototyping CAD system and a triangulated surface-based machining planning (manufacturing) system are developed. A dexel-based collision detection method and a force-torque feedback analysis are proposed for virtual prototyping module. The output of the virtual prototyping module can be either STL polyhedral surface model, or the tool motion, which is recorded as NC (numerically-controlled) commands. Haptic interface is also used in the machining planning to help determine the feasible tool orientation for 5-axis NC tool path generation. A new machining strategy of 5-axis pencil-cut machining is proposed with the haptic interface. An OBB (object bounding box)-tree and point-cloud-based Two-phase collision detection and force-torque feedback algorithm are proposed for virtual manufacturing module. Dexel-based method is developed for global tool interference avoidance with other components in a complex machining environment. To bridge the virtual prototyping module and machining planning module, a conversion marching algorithm is proposed to construct STL surface models from Dexel volume models. The algorithm can be used in both virtual prototyping system and NC simulation and verification. In the virtual sculpting module, a user can virtually sculpt a stock volume material intuitively by the haptic interface system. Hardware and software implementations of the haptic sculpting and machining planning system are also presented in this paper. The proposed methodology and developed haptic sculpting and machining planning system can be used in CAD/CAM systems and virtual prototyping.