Mateja Ploj Virtič

Vloga in pomen tehniškega izobraževanja v OŠ: kdo bo poučeval tehniko leta 2020?

Ponosni smo lahko na rezultate mednarodnih raziskav (TIMSS, PISA), ki nas na podrocju izobraževanja naravoslovnih predmetov in matematike postavljajo v sam svetovni vrh ali vsaj blizu njega. Lahko pa se vprasamo: Kako dolgo se? Iz projekcij narascanja stevila otrok v generaciji, upokojevanja uciteljev naravoslovno-matematicno-tehnicnih predmetov (NARMATEH) ter stevila tistih, ki v univerzitetnih programih za izobraževanje uciteljev teh ved tudi diplomirajo, lahko napovemo katastrofo – ustrezno izobraženih uciteljev NARMATEH že v nekaj letih ne bo dovolj, da bi nadomestili izpad. To utemeljujemo z vedenjem, da se bo leta 2030 upokojilo 1236 danes zaposlenih uciteljev NARMATEH, od tega 265 uciteljev predmeta Tehnika in tehnologija (TIT) v osnovni soli. Diplomantov, ki bi jih lahko nadomestili pa zaradi nezadostnega vpisa ne bo dovolj. Medtem, ko lahko univerzitetni ucitelji in sodelavci v programih NARMATEH zagotovimo kakovost dela z vpisanimi, pa sami ne moremo zagotoviti vzpodbud ter materialnih pogojev, s katerimi bi lahko privabili in nato tudi izobrazili bodoce ucitelje.

Developement of Mathematical Model for Detection of Cracks in Tooth Root Using an Adaptive Algorithm

This paper presents a control and diagnostics model of single stage gear wheels using acoustic responses. The model is based on various methods and procedures that provide information about the generator’s condition and, specifically, its service life. Four procedures are combined in this model: the mathematical module of the gear wheel that translates the complete mechanical module into mathematical form, the adaptive FIR (Finite Impulse Response) filter that calculates impulse responses from the non-linear system, the module for calculating any impulse response, and the FFT (Fast Fourier Transform) frequency analysis used for simulating frequency spectrums. The result of the simulation is the sound frequency spectrum that allows the analysis of gear wheel tooth damage and, based on this spectrum, calculation of the remaining service life and/or the maintenance process.

Vibration Diagnostics of a Gear Unit

1 University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia, e-mail:ales.belsak@uni-mb.si 2 University of Maribor, Faculty of Education, Koroška 160, 2000 Maribor, Slovenia, e-mail:mateja.ploj@uni-mb.si 3 University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia, e-mail:boris.abersek@uni-mb.si 3 University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia, e-mail:joze.flasker@uni-mb.si