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Item Information   Holdings       More by this author     Cook, Douglas L.     Subjects     Optical detectors     Sensors.     Coding     Hydraulic machinery     Light emitting diodes     Photodiodes     Fuzzy logic     MSE Project.     Browse Catalog     by author:      Cook, Douglas L.       by title:      Development of a lin...         MARC Display

Development of a linear optical absolute-position encoder for electro-hydraulic systems in uncontrolled environments / by Douglas L. Cook. by Cook, Douglas L. Subjects Optical detectors   Sensors.   Coding   Hydraulic machinery   Light emitting diodes   Photodiodes   Fuzzy logic   MSE Project. Description:  62 leaves : ill. ; 29 cm. Contents:  Thesis advisor: A. James Mallmann. Committee members: Dr. Steven Reyes, Thomas Bray. Introduction and background -- Literature review -- Materials and methods used in the investigation -- Results and discussion -- Conclusions and recommendations. Appendix A: Gray-code pattern and ideal sensor output signals -- B: ANSI C program source code -- C: Labview program GUI for real-time data acquisition -- D: Matlab 'm-file' to model the ideal sensor outputs -- E: Matlab file defining the fuzzy inferencing system -- F: Fuzzy-logic system overview -- G: Fuzzy-logic rule set overview. The purpose of this project was to develop a linear optical absolute-position encoder for electro-hydraulic systems operating in uncontrolled environments that can meet the specifications for a magnetic position encoder. The system must be able to provide a resolution of position of 0.1 mm, a resolution of velocity of 0.1 mm/s, and an accuracy of velocity of +- 2 mm/s. Several optical absolute-position encoder system designs already exist which can meet these performance requirements; but their effectiveness in uncontrolled environments is unknown. Large symbols were used for the code pattern so that obstructions and blemishes from dirt and debris would not significantly affect the reading of the individual sensor. Gray code was selected as the coding scheme to allow for simple error correction. Photodiodes were used to read the code pattern in an analog manner to allow for very high resolution in measurements. The analog signals were then converted to their digital equivalents to determine the position of the sensor assembly. The use of fuzzy logic as a means of error correction was also investigated. The system was determined to be capable of calculating position with a resolution better than 0.01 mm. Fuzzy logic was demonstrated to be capable of inferring the sensor signal for the 'high-frequency analog track' so long as the other signals were ideal.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .C667 2007 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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