Utjecaj mjernih postupaka na rezultat mjerenja srednjeg promjera navoja

doctoral thesis

• Title (english): Influence of measurement procedures on measurement results of pitch diameter
• Author: Vedran Šimunović
• Mentor: Vedran Mudronja (mentor)
• Committee member: Milan Opalić (predsjednik povjerenstva)
• Committee member: Vedran Mudronja (član povjerenstva)
• Committee member: Slobodan Bakula (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2014-04-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering
• Universal decimal classification (UDC): 621 - Mechanical engineering. Nuclear technology. Machinery ; 53 - Physics

Abstract

Cilj ovog istraživanja je odrediti na koji način veličine korištene za izračun srednjeg promjera navoja utječu na njegov konačni iznos te predložiti pouzdan proračun nesigurnosti rezultata mjerenja dobivenih različitim mjernim postupcima. Istraživanje obuhvaća ispitivanje paralelnih navoja kontaktnim metodama s naglaskom na metodu s tri valjčića za određivanje srednjeg promjera navojnih čepova te metode za određivanje srednjeg promjera navojnih prstena upotrebom T-ticala i mjernih čeljusti. Posebno se istražuje utjecaj temperature i utjecaj dimenzije mjernog elementa na izmjerenu vrijednost srednjeg promjera navojnih mjerila. Rezultati mjerenja uz pripadajuće nesigurnosti su verificirani kroz međulaboratorijsku usporedbu EURAMET.L-S21 koja je pokrenuta i vođena od strane Nacionalnog laboratorija za duljinu Republike Hrvatske. Rezultati istraživanja ukazali su na nedostatke dosadašnje mjeriteljske prakse i postupka prijave CMC vrijednosti u CIPM MRA KCDB bazu podataka. Ovim radom su predložene izmjene kojima bi se međusobno uskladili postupci i upute za mjerenje srednjeg promjera navoja i olakšala provedba usporedbi i prijave mjeriteljskih sposobnosti na području mjerenja navoja. Temeljem ovog istraživanja Nacionalni laboratorij za duljinu Republike Hrvatske se prilključio vodećim svjetskim institutima na području mjerenja navoja kroz objavu CMC vrijednosti.

Abstract (english)

This research investigates the effects of measured quantities on determination of pitch diameter final value and suggest the reliable uncertainty budget for the results obtained from different measurement procedures. Mechanical probing measurements are used for the determination of parallel thread gauges pitch diameter, where three wire method is used for the plug gauges, while both T-sphere and V-jag methods are used for thread ring gauges respectfully. Effects of temperature and probe geometries on measured pitch diameter values are particualrly emphasised within the scope of this work. Measurement results with corresponding uncertainties were evalueated within EURAMET supplementary comparison, which was intiated and piloted by National Laboratory for Length in Croatia. This research has shown that comparison procedures and procedures for registration of CMC's in the CIPM MRA KCDB should be changed by the means of calibration categories. It is shown that measurement results within categories of Pitch diameter and Simple pitch diameter must be comparable and therefore only two categories should be considered in the future comparions and CMC's registrations. Measurements with the additional methods (V-jag method and measurement of axial-profile) were performed and compared with SCRV value of EURAMET.L-S21 comparison. Results of pitch diameter obtained from the measurement of axial profile did not show good comparability and therefore extended reasearch should be carried out. Results of pitch diameter obtained with the V-jag has shown good comparability and this method can be used for pitch diameter calibration at the height level of measurement uncertainties.

• Keywords: srednji promjer navoja; utjecaji na mjerni rezultat; mjerna nesigurnost; Monte Carlo metoda; mjerenje paralelnih navoja
• Language: croatian
• URN:NBN: urn:nbn:hr:235:951767
• Study programme: Title: Mechanical Engineering and Naval Architecture; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-04-27 21:45:24