20.500.12556/RUL-172728 Modeliranje vijačnega spoja in njegov vpliv v prednapeti modalni analizi Bolted joint modelling and its influence in prestressed modal analysis Želeli smo rešiti problematiko, kako modelirati kontakte oziroma v našem primeru vijačni spoj in kako definirati njihove parametre v simulacijskem okolju, da čim bolje popišemo njihove vplive na lastne frekvence oziroma obnašanje v frekvenčni domeni. Lastne frekvence smo pomerili z mikrofonom na telefonu v gluhi sobi in nato smo se jim s spreminjanjem kontaktnih parametrov v simulaciji želeli čim bolj približati. Ugotovili smo, da se z dovolj zgoščeno mrežo, pravilno izbiro splošnih parametrov in optimalnim koeficientom trenja, iz katerega izračunamo tudi silo prednapetja v vijakih, lahko meritvam približamo z največjo napako 8 % na posamezni frekvenci. We wanted to address the challenge how to model contacts or in our example bolted joints and how to define parameters in a simulation environment in order to as accurately as possible capture their influence on natural frequencies and behaviour in the frequency domain. Natural frequencies were measured in an anechoic chamber using a phone microphone. Measured values were than as reference to match them as closely as possible by adjusting simulation parameters and specifically contact parameters. The results showed that with enough refined mesh, appropriate selection of simulation parameters and optimized coefficient of friction, which is used to calculate preload force in bolts, simulation results could approximate the measured frequencies with maximum deviation of 8 % per frequency. prednapeta modalna analiza vijačni spoji modeliranje kontaktov lastne frekvence merjenje z mikrofonom gluha soba prestressed modal analysis bolted joint contact modelling natural frequencies microphone measurements anechoic chamber true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-09-11 08:32:26 2025-09-11 08:32:28 2025-10-21 03:46:12 0000-00-00 00:00:00 2025 0 0 XXII, 77 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.882:534.63:004.942(043.2) 276007 249497091 44159.pdf 44159.pdf 1 D8FA30A90A89E9A7E5D5EAA99C7793BE 537230a968a032622adb40c65e192f4aae95669fe3cc21b4be17b72323c655f4 ed325774-8ed8-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=216758 Fakulteta za strojništvo 0 0 0