Obrada signala mjerenja kružnosti

master's thesis

• Title (english): Signal processing for roundness measurement
• Author: Vilim Kožuh
• Mentor: Vedran Šimunović (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Precision Mechanical Engineering

Abstract

Cilj ovog diplomskog rada je napraviti biblioteku funkcija koja se može koristiti za određivanje odstupanja od kružnosti na temelju izmjerenih podataka. Teorijski dio diplomskog rada objašnjava što je kružnost i odstupanje od kružnosti, parametre kružnosti, kojim metodama se mjeri kružnost uz njihove prednosti i mane, te zašto je i koja je metoda odabrana za mjerenje kružnosti ispitnog uzorka. Odabrana metoda detaljno je opisana sa naglaskom na greške koje se mogu pojaviti prilikom mjerenja ispitnog uzorka. Ujedno je opisano kako se te greške uklanjaju obradom signala i pozicioniranjem uzorka. Eksperimentalni dio vezan je uz obradu i filtraciju prikupljenih podataka; napravljena je biblioteka funkcija koja pomoću Fourierove transformacije obrađuje i filtrira podatke, te računa parametre kružnosti. Programski kod biblioteke detaljno je opisan, uz ponuđena objašnjenja korištenih funkcija. Izrađen je dodatni program za generiranje simuliranih podataka mjerenja kružnost u svrhu provjere točnosti i verifikacije izrađene biblioteke. Također su izvršena mjerenja kružnosti u Laboratoriju za precizna mjerenja dužina Fakulteta strojarstva i brodogradnje, na uređaju Mahr MMQ3. Podaci su analizirani i filtrirani korištenjem izrađene biblioteke za mjerenje kružnosti. Na samom kraju rada dana zaključak temeljem analize dobivenih rezultata.

Abstract (english)

The aim of this master's thesis is to create a function library that can be used to determine deviations from roundness based on measured data. The theoretical part of the thesis explains what roundness and deviations from roundness are, the parameters of roundness, the methods used to measure roundness along with their advantages and disadvantages, and why and which method was chosen for measuring the roundness of the test sample. The selected method is described in detail with an emphasis on the errors that may occur during measurements of the test sample. It also describes how these errors are eliminated through signal processing and sample positioning. The experimental part is related to the processing and filtration of the collected data; a function library was created that uses the Fourier transform to process and filter the data and calculates the roundness parameters. The program code of the library is described in detail, with explanations of the functions used. An additional program was created to generate simulated roundness measurement data to verify the accuracy and validation of the developed library. Additionally, roundness measurements were performed in the Laboratory for Precision Length Measurements at the Faculty of Mechanical Engineering and Naval Architecture, on the Mahr MMQ3 device. The data was analyzed and filtered using the developed roundness measurement library. At the very end of the thesis, a conclusion is provided based on the analysis of the obtained results.

• Keywords: kružnost; odstupanje od kružnosti; obrada signala; Fourierova transformacija; filtracija podataka
• Keywords (english): roundness; roundness deviation; signal processing; Fourier transform; data filtering
• Language: croatian
• URN:NBN: urn:nbn:hr:235:811221
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-09 11:51:34