Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"parallel kinematic"”.
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Synthesis and analysis of parallel Kinematic XY flexure mechanisms
This thesis presents a family of XY flexure mechanisms with large ranges of motion, first-order decoupled degrees of freedom, and small parasitic error motions. Synthesis is based on an systematic and symmetric layout of constraints that are realized by means of common flexure building blocks. An …
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Design and analysis of the three degrees of freedom parallel kinematic machine
… based on the developed stiffness model. Kinematics and dynamics of the new PKM is also modeled and simulated.
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Kinematic Calibration of Parallel Kinematic Machines on the Example of the Hexapod of Simple Design
The aim of using parallel kinematic motion systems as an alternative of conventional machine tools for precision machining has raised the demands made on the accuracy of identification of the geometric parameters that are necessary for the kinematic transformation of the motion variables. The …
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Development of Novel Piezo-Driven Parallel-Kinematics Micropositioning Stages
… The key idea is to build the stages based on parallel kinematic mechanisms (PKM) that are more suitable for micropositioning than their serial counterparts. In order to further improve their kinematic and dynamic performance, the stages are built as monolithic systems by using flexure hinges …
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Design of 3-DOF parallel manipulators for micro-motion applications
This thesis presents two unique micro-motion parallel kinematic manipulators (PKM): a three degrees of freedom (3-DOF) micro-motion manipulator and a 3-DOF micro-motion manipulator with actuation redundancy. The 3-DOF micro-motion manipulator has three linear-motion driving units, and the 3-DOF …
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Design of a low-cost high-performance flexural six degree-of-freedom positioning stage
… components. The motion platform presented is a parallel kinematic machine supported by six flexural legs that each ride on a ball screw assembly. The required degrees of freedom and range of motion for the flexural and rolling elements are analyzed. The stiffness and stress analysis of each …
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Development of standard components for multi-degrees-of-freedom mems positioning stages with closed-loop feedback
… were developed by the implementation of parallel kinematic mechanisms and transducers at the micro-scale and increased structural stiffness and natural frequency of the system in a favorable way. They were fabricated on SOI and double-sided SOI wafers with standard photolithography …
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A 2 degree-of-freedom SOI-MEMS translation stage with closed loop positioning
… micro positioning stage is developed by adapting parallel-kinematic mechanisms, which have been widely used for macro and meso scale positioning systems, to silicon-based micropositioner. Two orthogonal electrostatic comb drives are connected to moving table through 4-bar mechanism and independent …
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Contact region fidelity, sensitivity, and control in roll-based soft lithography
… part of the thesis addresses process control. A parallel kinematic stage is designed to manipulate the height and pitch of a roll over a substrate with submicron precision. A hybrid state-space / classical feedback control approach is used to achieve high bandwidth servo control in the presence …
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Modeling and Control of Stiff Robots for Flexible Manufacturing
… of the three degree-of-freedom (DOF) Gantry-Tau parallel kinematic robot, which has the potential to fulfill the requirements on accuracy, mechanical stiffness and conceptual flexibility of a robot for SMEs. Additionally, concepts that aid the SMEs to achieve the required accuracy and a more …