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.
Results
Showing 1 to 20 of 27 for “"Error Compensation"”.
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Overcoming nanoscale variations through statistical error compensation
… overcome processing non-idealities. Statistical error compensation (SEC) is a class of system-level, communication-inspired techniques for designing energy efficient and robust systems. In this thesis, stochastic sensor network on chip (SSNOC), a known SEC technique, is applied to a computational …
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Volumetric error compensation for 5-axis machine tools
<p>"This work presents a geometric error compensation method for large 5-axis machine tools. The compensation method presented here uses tool tip measurements recorded throughout the axis space to construct a position-dependent geometric error model that can easily be used for error compensation. …
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Volumetric error compensation for industrial robots and machine tools
… efficient and increasingly popular volumetric error compensation method for machine tools is to compute compensation tables in axis space with tool tip volumetric measurements. However, machine tools have high-order geometric errors and some workspace is not reachable by measurement devices, …
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Variable depth of cut machining for dynamic error compensation
… the turning of non-circular workpieces and the compensation of process-generated dynamic errors. Deficiencies in existing VDCM systems include insufficient speed, accuracy, and servo stiffness. The goal of the proposed research is to advance VDCM to industrial applicability. Specifically, the …
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Machining accuracy enhancement using machine tool error compensation and metrology
… to enhance machining accuracy by machine tool error reduction and workpiece metrology. The error characteristics are studied by building a quasi-static error model. Perturbed forward kinematic model is used for modeling a 5-axis Computer Numerical Control (CNC) machine with one redundant linear …
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Statistical error compensation for robust digital signal processing and machine learning
… are inherently probabilistic and robust to errors, statistical error compensation (SEC) techniques can play a significant role in achieving robust and energy-efficient implementation of these important kernels. SEC embraces the statistical nature of errors and utilizes statistical and …
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Failure detection and repair of threads in CTAS
Reliable, error-free software is hard to come by, and this is especially true for newer, larger, or more complex programs. CTAS, an air traffic control tool, falls into this category, making it a good candidate for research on error compensation. Specifically, this thesis addresses the issue of …
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Machine tool accuracy characterization, error modeling and compensation using telescopic ballbar and laser interferometer
… on the machine tool accuracy characterization, error modeling and error compensation using telescopic ballbar and laser interferometer. Increasing demand for both higher machine tool accuracy and machining tolerances has resulted in a great need to measure and characterize the accuracy of NC …
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Full Field Reconstruction Enhanced With Operational Modal Analysis and Compressed Sensing for General Dynamic Loading
… the modal expansion method is limited by errors from mode aliasing, inaccuracy of the calculated mode shapes and the noise in measurements. In order to overcome these limitations, the modal expansion method is enhanced by mode selection and error compensation in this study. First, the key …
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Integrated optical analog-to-digital converter
… on its operation is evaluated. A universal error compensation algorithm for improving the conversion accuracy is proposed. On the way to implementation of the integrated optical ADC, two of its critical components - ring resonator filter bank and fiber-to-chip coupler -are designed. A novel …
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DATA-DRIVEN MODELING AND CONTROL FOR TIME-VARYING MULTISTAGE MANUFACTURING PROCESSES
… GPR method based control scheme as an effective error compensation tool for nonlinear and time-varying MMPs.
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Modeling fused filament fabrication machine height accuracy through layer thickness variation
… the modeling and prediction of total height error of a 3D printed part using a layer-by-layer approach. Layer to layer thickness error is modeled across the build height of Polyactic acid (PLA) and Acrylonitrile butadiene styrene (ABS) parts. A height error compensation model is then …
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Height error mapping and compensation for a fused filament fabrication machine
An artifact-based height error mapping and compensation method for fused lament fabrication machines ("3D printers") is developed. In the proposed method, an error mapping artifact is produced and inspected using a coordinate measuring machine to determine height errors at 81 discrete points in the …
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Cooperative Hoisting with Dual Crawler Cranes: Modeling, Motion Planning, and Control under Constraints
… feasibility. On this basis, a PID-based coupled error compensation control scheme is developed to coordinate the motions of the two cranes while suppressing load sway. The controller integrates synchronization and attitude error compensation to achieve cooperative stability and high precision …
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Design of robust ultra-low power platform for in-silicon machine learning
… this dissertation proposes to employ statistical error compensation (SEC) as an effective error compensation technique. This dissertation makes a contribution to the portfolio of SEC by proposing embedded algorithmic noise tolerance (E-ANT) for low overhead error compensation. E-ANT operates by …
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Reliable spin-based computing systems
… them to operate at worst case delay (and low error-rate), thereby completely offsetting the energy-delay benefits of spin devices and making them non-competitive against CMOS. In this thesis, we show that, by exploiting inherent device characteristics and architectural-level techniques, it is …
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Improvement of position and orientation tracking accuracy by fusing HTC Vive trackers and Inertia Measurement Units
… tracking systems have been used for calibration, error compensation and navigation of robots to enable higher precision machining, assembly, or control. Laser trackers are the most common position tracking system in the aerospace industry despite the high price. They can track minute position …
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Development of a three-dimensional camera based on subsampled optical coherence tomography (OCT)
… comple-conjugate ambiguity. A calibration and error compensation method was developed to fully remove residual artifacts in the image. We combined the high speed laser and the interferometer to demonstrate the first OCT camera-like imaging across several centimeters of depth range. The …
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Non-invasive microwave and millimeter wave reflectometry and imaging for human skin diagnosis and materials characterization
… imaging systems, the translational position error can lead to significant image quality degradation. A comprehensive approach is proposed for analyzing this problem, resulting in an effective position error compensation method. Although SAR imaging is an effective tool for nondestructive …
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A kinematic-coupling-based adaptive fixture for high precision positioning applications in flexible manufacturing systems
… Given the many sources of time variable errors in fixture alignment (i.e. thermal, load, vibration), the integration of actuators and sensors within fixtures will be necessary to achieve real-time error compensation. This thesis examines the fundamental issues and design challenges …
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