20.500.12556/DKUM-68890 Designing the gear body structure to control vibration behaviour Konstruiranje zobniških teles z namenom obvladovanja vibracij This research presents a new approach aiming to reduce gear vibration as well as its weight by modifying the gear body structure. The primary objective was to reduce vibration and noise emission of spur gears. For this purpose, a solid gear body was replaced by a cellular lattice structure, which was expected to raise the torsional elasticity of the gear body. The cellular lattice structure was designed and optimized by FE-based topology optimization software CAESS ProTOp, which is based on strain energy control. For experimental purposes, the optimized gear was produced from Titanium alloy Ti-6Al-4V ELI by using Selective Laser Melting technique. A polymer matrix was added to increase the damping of the structure. In order to test the gears, a new test rig with closed loop was conceived, designed and produced. The test rig is equipped with two gear pairs: with the tested one and with the driving one. The gears have been run and tested at different speeds and torque. The acceleration, strain and sound pressure of a running gear pair was measured. The final processing of the signal was done by a specially developed software based on LabView. By employing the fast Fourier transformation the time signal of acceleration, strain and sound pressure has been converted to the frequency spectrum and time frequency spectrogram. The results obtained by testing the solid and cellular lattice gear body were compared. It was experimentally confirmed that the cellular lattice structure of a gear body and addition of a polymer matrix may significantly reduce the vibration. Raziskava predstavlja nov pristop, katerega cilj je zmanjšati vibracije v zobniških dvojicah in zmanjšati težo zobnikov s spreminjanjem njihove strukture. Glavni cilj je zmanjšanje vibracij in nivo hrupa valjastih zobnikov z ravnim ozobjem. V ta namen je bila trdna struktura nadomeščena z celično mrežasto strukturo, za katero naj bi se povečala torzijska elastičnost zobnika. Celična struktura je bila zasnovana in optimizirana s programsko opremo za optimizacijo topologije, s pomočjo MKE, CAESS ProTOp, ki temelji na optimizaciji deformacijske energije. Optimiziran zobnik je bil izdelan iz Titaniumove zlitine Ti-6Al-4V ELI z uporabo tehnike selektivnega laserja. Z dodajanjem polimerne matrice se je povečalo dušenje strukture, kar je privedlo do zmanjšanja vibracij. Za preizkušanje orodja je bila zasnovana in izdelana nova testna plošča z zaprto zanko. Testna plošča je opremljena z dvema zobniškima paroma: s preizkuševalnim in s pogonskim parom. Zobniki so bili preizkušeni pri različnih hitrostih in navoru. Pri preizkusu je bil izmerjen pospešek, deformacija in zvočni tlak preizkuševalnega para zobnikov. Obdelava signalov je bila izvedena v LabView programskem orodju v namensko razvitem programu. Z uporabo Fast Fourierove transformacije je časovni signal pospeška, deformacije in zvočnega tlaka pretvorjen v frekvenčni spekter in frekvenčni spektrogram. Z primerjanjem rezultatov, dobljenih s pomočjo testiranja navadnega in zobnika z rešetko, je bilo potrjeno, da lahko celična struktura zobnika in dodajanje polimerne matrice bistveno zmanjšata vibracije. Gear vibration cellular lattice structure topology optimization test rig Gear vibration cellular lattice structure topology optimization test rig true true false [R. Ramadani] Angleški jezik Slovenski jezik Doktorska disertacija 2017-11-08 10:20:23 2018-02-27 10:55:39 2022-08-01 16:26:28 2019-07-11 17:14:04 2018 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.83.034:519.6(043.3) 293925120 URN:SI:UM:DK:CN0BEZUW DOK_Ramadani_Riad_2018.pdf DOK_Ramadani_Riad_2018.pdf 1 EBCA2888BA2F4376E721A2F3131F389F b5b298b4d0634129234a7f74a3352fe43e47afd373f002d87449e1f8d76294a4 b0cdfc4a-7c0f-11eb-bb7a-00155d0001ca 20.500.12556/dkum/783a06fb-2ba2-4385-8f91-c8b948acb89e https://dk.um.si/Dokument.php?lang=slv&id=122280 Fakulteta za strojništvo 0 0 0