Global ETD Search

1	Automatiserad provrörskarusell : Elektronikkonstruktion och utvärdering / Automated sample tube mover Rosenfeld, Carl January 2010 (has links) <p>Den här rapporten beskriver arbetet med en automatiserad provrörsförflyttare. Det är ett examensarbete som har gjorts på företaget Q-linea AB. En karuselliknande konstruktion med en stegmotor användes för att flytta prover mellan ett antal positioner. En mikrokontroller som hanterar styrning och sensordata har programmerats i C. LabVIEW och en USB-kamera har använts som hjälp till att göra utvärderingar och tester av systemet. Målet var att konstruera en prototyp som uppfyllde de precisionskrav och tidskrav som ställdes, vilket också uppnåddes. Rapporten beskriver arbetsgången och avslutas med rekommendationer för fortsatt arbete. Rapporten innehåller en teoridel som kan användas till hjälp för att konstruera liknande system, d.v.s. roterande positioneringstillämpningar.</p> / <p>This thesis describes the work of an automated sample tube mover. This is a degree project and has been done at the company Q-linea AB. A carousel similar construction with a stepper motor has been designed for the task to move samples between a numbers of positions. A microcontroller has been programmed to control the movements and handle sensor data. LabVIEW have been used together with an USB-camera in order to do evaluations and tests of the system. The goal was to design a prototype that fulfills the demanded requirements of precision and timing, which also was achieved. The thesis describes the work process and concludes with recommendations for further work.</p> Rotary Positioning stepper motor magnetic rotary encoders linear speed ramp Roterande positionering stegmotor magnetisk rotationsgivare rampning
2	Automatiserad provrörskarusell : Elektronikkonstruktion och utvärdering / Automated sample tube mover Rosenfeld, Carl January 2010 (has links) Den här rapporten beskriver arbetet med en automatiserad provrörsförflyttare. Det är ett examensarbete som har gjorts på företaget Q-linea AB. En karuselliknande konstruktion med en stegmotor användes för att flytta prover mellan ett antal positioner. En mikrokontroller som hanterar styrning och sensordata har programmerats i C. LabVIEW och en USB-kamera har använts som hjälp till att göra utvärderingar och tester av systemet. Målet var att konstruera en prototyp som uppfyllde de precisionskrav och tidskrav som ställdes, vilket också uppnåddes. Rapporten beskriver arbetsgången och avslutas med rekommendationer för fortsatt arbete. Rapporten innehåller en teoridel som kan användas till hjälp för att konstruera liknande system, d.v.s. roterande positioneringstillämpningar. / This thesis describes the work of an automated sample tube mover. This is a degree project and has been done at the company Q-linea AB. A carousel similar construction with a stepper motor has been designed for the task to move samples between a numbers of positions. A microcontroller has been programmed to control the movements and handle sensor data. LabVIEW have been used together with an USB-camera in order to do evaluations and tests of the system. The goal was to design a prototype that fulfills the demanded requirements of precision and timing, which also was achieved. The thesis describes the work process and concludes with recommendations for further work. Rotary Positioning stepper motor magnetic rotary encoders linear speed ramp Roterande positionering stegmotor magnetisk rotationsgivare rampning
3	Analysis of Accuracy for Engine and Gearbox Sensors Dogantimur, Erkan, Johnsson, Daniel January 2019 (has links) This thesis provides a standardized method to measure accuracy for engine and gearbox sensors. Accuracy is defined by ISO 5725, which states that trueness and precision need to be known to provide a metric for accuracy. However, obtaining and processing the data required for this is not straight forward. In this thesis, a method is presented that consists of two main parts: data acquisition and data analysis. The data acquisition part shows how to connect all of the equipment used and how to sample and store all the raw data from the sensors. The data analysis part shows how to process that raw data into statistical data, such as trueness, repeatability and reproducibility for the sensors. Once repeatability and reproducibility are known, the total precision can be determined. Accuracy can then be obtained by using information from trueness and precision. Besides, this thesis shows that measurement error can be separated into error caused by the sensors and error caused by the measurand. This is useful information, because it can be used to assess which type of error is the greatest, whether or not it can be compensated for, and if it is economically viable to compensate for such error. The results are then shown, where it is possible to gain information about the sensors’ performance from various graphs. Between Hall and inductive sensors, there were no superior winner, since they both have their strengths and weaknesses. The thesis ends by making recommendations on how to compensate for some of the errors, and how to improve upon the method to make it more automatic in the future. statistical analysis engine gearbox sensor sensors rotation rotational speed differential pressure performance characteristics trueness precision accuracy Hall inductive induction gauge pressure reference hysteresis bias noise linearity non-linearity DEWESoft DAQ wheel tooth teeth absolute rotary encoder matlab XOR Gray binary LabView sampling measurement measuring statistisk analys motor växellåda sensor sensorer rotation rotationell hastighet fart differentiell tryck prestanda karaktäristik trueness precision accuracy noggrannhet onoggrannhet Hall induktiv induktion tryckskillnad referens hysteres bias avstånd brus linjäritet linearitet olinear olinjär olinearitet olinjäritet DEWESoft DAQ sampling mätning hjul tand tänder absolut rotationsgivare givare matlab XOR Gray binär LabView Elektroteknik och elektronik

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