20.500.12556/RUL-103314 Nelinearni odziv elektromehanskega sistema Nonlinear response of electromechanical system Elektromehanski sistemi so podvrženi nelinearnim popačenjem. Zvočnik je tipičen primer elektromehanskega sistema. Zvočniki majhnih dimenzij in širokopasovni zvočniki predstavljajo občutljiv sistem, saj morajo zaradi dinamičnega razpona izvajati dolge premike membrane. Odzivi nelinearnosti teh sistemov so bili v preteklosti že popisani z znanimi signali, ki so bili razviti za identifikacijo in kvantizacijo posameznih tipov nelinearnih popačenj. Najpogosteje se pri popisu odziva uporablja že znane testne signale in obsežno digitalno obdelavo, še posebej transformacijo iz časovne domene v frekvenčno domeno in obratno. V nam dostopni literaturi je malo primerov obravnave nelinearnosti elektromehanskih sistemov na osnovi konvolucijskega integrala z integriranim operatorjem nelinearnosti. Zato je osrednji cilj tega dela identifikacija operatorja nelinearnosti elektromehanskega sistema v konvolucijskem integralu z namenom modeliranja le-tega v nelinearnem območju delovanja. Naredil sem primerjavo med nelinearnim odzivom elektromehanskega sistema z modelom za linearni odziv, v katerem je nastopal operator nelinearnosti. Da pa se sistem naredi aplikativen, sem naredil meritve na treh različnih zvočnikih, saj le-ti predstavljajo občutljiv sistem, ki je ves čas podvržen nelinearnim popačenjem. Sintetizirali smo nov testni signal, ki povzroči nestabilno delovanje s sesedanjem signala na zvočniku in omogoči hitro in preprosto analizo občutljivosti sistema na nelinearna popačenja. All electromechanical systems are prone to nonlinear distortions. Small loudspeakers and full-range loudspeakers are especially sensitive in this respect, since they have to perform long excursions due to the dynamic range. These types of distortions have been normally observed with methods that were developed for identification and quantification of individual types of nonlinear distortions. Most of them use well known test signals and extensive digital processing, usually switching from time domain into frequency domain and vice versa. In only few cases have nonlinear distortions been studied where they incorporated the nonlinear convolution operator into the convolution integral. The main objective of this work is to identify nonlinear operator of electromechanical system in the convolution integral for the purpose of simulating the nonlinear response. A comparison, between nonlinear response of electromechanical system with simulation, using convolution with incorporated nonlinear operator, is introduced in this work. To make this system applicative, all tests were performed on three different loudspeakers, because they are prone to nonlinear distortions. We developed a new test signal forcing the operation of the loudspeaker into nonlinear regime, which enables fast and lucid identification of nonlinear distortions. nelinearna popačenja nelinearna konvolucija operator nelinearnosti časovna domena nonlinear distortion nonlinear convolution nonlinear operator time domain true false false Slovenski jezik Angleški jezik Zaključna naloga 2018-09-16 07:45:19 2018-09-16 07:45:23 2022-08-16 03:41:18 0000-00-00 00:00:00 2018 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 90494 3243620 415.pdf 415.pdf 1 106CD68B2FECE9954A11AD49EF25C130 eb8cb026280fd7f58317c33a38d3241caded1a9d780deb966b1bb24c068751ab c5fb477a-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=113730 Fakulteta za matematiko in fiziko 0 0 0