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 11 of 11 for “"Ultra-precision"”.
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Design of ultra precision fixtures for nano-manufacturing
… and experimental validation of an active precision fixturing system called the Hybrid Positioning Fixture (HPF). The HPF uses the principles of exact constraint, combined with principles and means of Nanomanipulation to fixture components with tens of nanometer accuracy and repeatability. …
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Development of an ultrafast laser ultra-precision machining platform
Ultra-precision manufacturing is commonplace in today’s society. It is used in a huge number of applications from electronics, medical devices to energy devices. Most devices manufactured using ultra-precision methods are made in high quantities where the volume of the components is required to …
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Design, control and error analysis of a fast tool positioning system for ultra-precision machining of freeform surfaces
… required positioning accuracy and stiffness for ultra-precision freeform manufacturing. This goal is achieved through deterministic structural design, detailed error analysis, and novel control algorithms.Firstly, a novel stiff-support design was proposed to eliminate the structural and bearing …
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Minimum error tool path generation method and an interpolator design technique for ultra-precision multi-axis CNC machining
This thesis investigates an ultra-precision multi-axis CNC machining problem encountered in machining sculptured surfaces. Conventional multi-axis CNC machining uses straight line segments to connect consecutive data points, and uses linear interpolation technique to generate the command signals …
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Modeling and robust adaptive control of metal cutting via application of piezoactuator
… an important controllable positioning device for ultra-precision machining. With the application of piezoactuator, a much more accurate model is required for achieving the ultra-precision control. In this thesis, rather than using the commonly accepted linear Merchant model, the relationship of …
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Electromagnetically-driven ultra-fast tool servos for diamond turning
… design and experimental demonstration of: novel ultra-fast electromagnetic actuators, integration of these actuators in a new class of FTS, a novel real-time control computer with 1 million samples per second throughput, MIMO loop shaping techniques for parallel power amplifiers, and a novel …
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High bandwidth rotary fast tool servos and a hybrid rotary/linear electromagnetic actuator
… and analytical tools are developed for precision mechanical systems, power and signal electronic systems, control systems, normal-stress electromagnetic actuators, and the dynamics of the combined systems. A fast tool servo (FTS) is a high-speed auxiliary servo axis that is added to a …
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Element and system design for active and passive vibration isolation
… on control of absolute payload motion for ultra-precision instruments such as the MIT/Caltech Laser-Interferometric Gravitational Wave Observatory (LIGO), which is designed to measure spatial strains on the order of 10-²¹. We develop novel passive elements and control strategies as well as …
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Novel diagnostic techniques for investigations into energy and matter transport in dynamic systems
… was designed, constructed, and calibrated to the ultra precision standards required to measure nano-scale forces including a force and mass-loss resolution of nN and µg respectively. The tool was then used to characterise the behaviour of some ‘generic’ pulsed nano-second light matter inactions …
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Development of a nano-precision ruling engine for machining of freeform micro-scale optical surfaces
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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BioLaser: Establishing a High-Resolution Laser Ablation Tomography Platform for UK Bioimaging Research
… to these requirements a novel proof-of-concept ultrafast laser ablation tomography system named “BioLaser” was proposed. A proof-of-concept BioLaser system has been built using an existing ultrafast laser platform as a base. Several interchangeable high-resolution microscopes are integrated, as …