20.500.12556/RUL-110493 Vplivi velikosti notranje prostornine tlačnega zaznavala na dinamične lastnosti merilnega sistema za tlak Effects of the internal volume of a pressure sensor on the dynamic properties of a pressure measurement system Za merjenje zvezno spreminjajočega tlaka pogosto uporabljamo piezoelektrična zaznavala, povezana s cevko. Prostornina znotraj pokrovčka tlačnega zaznavala lahko odločilno vpliva na dinamične lastnosti merilnega sistema, v katerem se tlačni signal, ki ga izmerimo, razlikuje od merjenega tlaka. V tej nalogi smo ugotavljali lastnosti teh sistemov z različnimi pokrovčki ter cevkami, s katerimi smo obravnavali podkritično in nadkritično dušene sisteme. Izvajali smo meritve na dinamičnem generatorju tlaka z dvema piezoelektričnima zaznavaloma, kjer je bilo eno neposredno pritrjeno na generator za referenco in drugo povezano s cevko. Poleg tega pa smo izračunali karakteristike sistema še s teoretičnimi modeli. Meritve in teoretični modeli so se najbolj ujemali v sistemih s krajšimi cevkami, prostornina je na dušilne razmernike imela večji vpliv pri sistemih s cevkami z majhnim premerom ali krajšo dolžino. Piezoelectric sensors with a connecting tube are often used for measurements of time varying pressure. The volume inside of the sensor cap can have a decisive effect on the properties of measurement system in which the pressure signal within the measured object differs from the measured one. Within this paper we have studied the properties of the systems with different sensor caps and connecting tubes in order to investigate the properties of both underdamped and overdamped systems. The measurements were made on a dynamic pressure generator with two piezoelectric sensors one of which was directly mounted on the generator as a reference and the other connected with a tube. Calculations based on theoretical models were also made. Theoretical models predicted the measured values well for shorter tubes and the internal volume of the cap had a larger effect on damping ratios when shorter tubes or tubes with smaller internal diameter were used. meritve tlakov vplivi volumnov frekvenčne karakteristike naravne frekvence dušilni razmerniki časovne konstante pressure measurements internal volumes frequency characteristics damping ratios time constants true false false [T. Perme] Slovenski jezik Angleški jezik Zaključna naloga 2019-09-15 07:45:43 2019-09-15 07:45:44 2023-11-29 13:22:50 0000-00-00 00:00:00 2019 0 Ljubljana 0 XIV, 23 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 531.787:681.2.08(043.2) 217073 16943643 4377.pdf 4377.pdf 1 1196EEAEE2676589F7D263A1D039517F e7c2568e45ee582606586922aa1dfba989e5169b5e3e1d774ce26a5b09869bcf 2217769c-a1b7-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=122160 Fakulteta za strojništvo 0 0 0