Accuracy of hard particles concentration measurement is affected by different influence quantities. Main of them are discussed, analyzed and introduced in the theses. The aim of the investigation was to measure particles concentration with different instruments in real conditions, to compare and analyze the results, to determine coefficients showing difference of different instruments, to compare simulated and experimental researches results, to estimate measuring errors. Final master work contents of five chapters. In first review chapter measuring methods of hard particles concentration, demand of these measurings, implements and their characteristics were considered. Also maesuring standards and normatives were considered. In second chapter measuring methodology and equipements are described. The widely used mass method was compared with optical and vibro methods in this work. Possibilities of different measuring methods practice were evaluated, when sampling air flow velocity was 1 l/min, 2 l/min, 3 l/min, 5 l/min ir 10 l/min. In third chapter air flow in arcuated duct was simulated on real experimental data. Reliance of hard particles concentration on position of measuring point in duct cross-section was rated. In fourth chapter experimental measuring and simulation results were compared. In fifth chapter statistical analysis of measuring data was done. Random and systematic errors of particles concentration measuring were estimated. It could be staded that optical and... [to full text]

Baigiamajame magistro darbe atlikta Lietuvos ir Lenkijos gravimetrinių tinklų analizė. Apžvelgta IGSN 71 sunkio sistemos perdavimo metodika, išnagrinėtas gravimetrinių tinklų tikslumas. Pateikta informacija apie naujausią automatinį gravimetrą Scintrex CG-5, atlikta Lietuvos antrosios klasės gravimetrinio tinklo sudarymo metodikos detali analizė. Sudaryta gravimetrinių matavimų duomenų bazė, kuri gali būti naudojama gravimetrinių matavimų duomenų analizei. Panaudojant antrosios klasės gravimetrinio tinklo matavimų gravimetrais Scintrex CG-5 duomenis, atlikti, sunkio pagreičio tikslumo priklausomybės nuo matavimų skaičiaus punkte, tyrimai. Darbe gauti tyrimų rezultatai gali būti panaudoti tobulinant matavimų gravimetrais Scintrex CG -5 metodiką. Darbą sudaro 6 dalys: įvadas, 4 skyriai, išvados, literatūros sąrašas. Darbo apimtis – 98 p. , 56 iliustr., 22 lent., 28 bibliografiniai šaltiniai. / Thesis carried out in Lithuania and Poland, the gravimetric analysis of the network.Reviewed in IGSN 71gravity system of transmission methods, examined the accuracy of gravimetric networks. The information on the latest automatic gravimeter Scintrex CG-5, made second-class Lithuanian gravimetric network of methodology on a detailed analysis. Done gravimetric measurement database that can be used for gravimetric measurement data analysis. Using a second-class gravimeters gravimetric network Scintrex CG-5 data, perform, acceleration of gravity accuracy dependence on the number of measurements point out. We obtain the results can be used to improve measurement gravimeters Scintrex CG -5 methodology. The work consists of six parts: introduction, four sections, conclusions and the list of literature. Working volume - 98 pages, 56 drawings, 25 tables. The list of literature includes 28 bibliographical sources.