Utvrđivanje točnosti rezultata mjerenja promjera ostvarenih ručnim mjerilima duljine

undergraduate thesis

• Title (english): Accuracy analysis of diameter results obtained using hand measuring instruments
• Author: Toni Cindrić Gašparović
• Mentor: Gorana Baršić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

Mjerenje unutarnjih promjera čest je mjeriteljski zadatak u realnim proizvodnim uvjetima. Shodno tome, svaki mjerni rezultat pa tako i rezultat mjerenja unutarnjeg promjera potrebno je iskazati u obliku cjelovite mjeriteljske informacije. Cjelovita mjeriteljska informacija se sastoji od mjernog rezultata i mjerne nesigurnosti, uz faktor pokrivanja i informaciju o razini vjerojatnosti.
Stoga su u ovom završnom radu provedena mjerenja unutarnjih promjera na pet kontrolnih prstena korištenjem tri različita ručna mjerila (pomično mjerilo, mikrometar za unutarnja mjerenja te trokraki mikrometar). Mjerenja su provedena u Nacionalnom laboratoriju za mjerenja dužina koji se nalazi na Fakultetu strojarstva i brodogradnje u Zagrebu.
Prije samog početka eksperimentalnog dijela detaljno su proučena pojedina mjerila koja se danas koriste u praksi za mjerenje unutarnjih promjera te njihove glavne karakteristike i načini na koje se koriste što je detaljno objašnjeno i opisano kasnije u ovom radu.
U eksperimentalnom dijelu rada navedene su značajke korištenih ručnih mjerila i korištenih kontrolnih prstena. Nakon što su ostvareni mjerni rezultati i procijenjene mjerne nesigurnosti provedena je usporedba rezultata s referentnom vrijednošću odnosno vrijednosti koja je navedena u važećoj Potvrdi o umjeravanju mjernog prstena. Na temelju rezultata provedene analize u zaključku rada raspravlja se o važnosti iskazivanja cjelovite mjeriteljske informacije.

Abstract (english)

Measuring internal diameters is a common metrological task in real production conditions. Consequently, every measurement result, including the result of measuring the inner diameter, must be expressed in the form of complete metrological information. Complete metrological information consists of measurement result and measurement uncertainty, with coverage factor and probability level information.
Therefore, in this final work, measurements of internal diameters were performed on five control rings using three different manual measuring instruments (vernier calliper, micrometer for internal measurements and three-point micrometer). The measurements were performed in the National Laboratory for Length located at the Faculty of Mechanical Engineering and Naval Architecture in Zagreb.
Before the very beginning of the experimental part, the individual measuring instruments used in practice for measuring internal diameters and their main characteristics and the ways in which they are used were studied in detail, which is explained and described in detail later in this paper.
In the experimental part of the paper, the characteristics of the used manual measuring instruments and the used control rings are listed. After the measurement results were achieved and the measurement uncertainties were estimated, the results were compared with the reference value, ie the value specified in the valid Certificate of Calibration of the Measurement Ring. Based on the results of the analysis conducted in the conclusion of the paper, the importance of presenting complete metrological information is discussed.

• Keywords: rezultat mjerenja; mjerna nesigurnost; usporedba rezultata mjerenja; unutarnji promjer; ručna mjerila duljine; cjelovita mjeriteljska informacija
• Keywords (english): measurement result; measurement uncertainty; comparison of measurement results; internal diameter; manual measuring instruments; complete netrological information.
• Language: croatian
• URN:NBN: urn:nbn:hr:235:650352
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Industrial Engineering and Management; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-09-23 07:52:38