Vibroakustična karakterizacija krogličnih ležajev s povečano zračnostjo

Bregar, Tomaž (author), Boltežar, Miha (mentor), Čepon, Gregor (comentor)

V tem delu je predstavljen razvoj numeričnega modela, ki omogoča simulacijo hrupa zaradi udarjanja kotalnih elementov z obroči ležaja. Obravnavani so kroglični ležaji s povečano zračnostjo, katerih kotalni elementi so kroglice. Dinamika obravnavanega ležaja je izračunana s poenostavljenim analitičnim modelom, ki nadomešča ležaj preko zapisa togostne matrike. Učinkovito simulacijo dinamike sistema dosežemo z uporabo modalne redukcije, s katero znižamo število prostostnih stopenj modela. Potek zvočnega tlaka ob trku kroglice je simuliran z metodo končnih elementov in validiran s preprostim eksperimentom. Izdelano je tudi preizkuševališče, s katerim smo ponazorili udarjanja kotalnih elementov v obroč ležaja. Preizkuševališče nam omogoča končno validacijo numeričnega modela zvoka, ki se pojavi ob trku kroglic.

• Language: Slovenian
• Keywords: kroglični ležaj kotalni elementi numerična simulacija analitični model akustika zvok trk
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95464
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: Vibroacoustic characterization of ball bearings with increased clearance

Abstract

This work presents development of numerical model used for simulating noise generated by impact between rolling elements and bearing rings. The work addresses ball bearings with increased clearance whose rolling elements are balls. The dynamics response of the bearing is calculated with simplified analytical model that replaces the ball bearing in a simulation with a equivalent stiffness matrix. Effective simulation of the system’s dynamics is obtained by using modal reduction that reduces the number of degrees of freedom. Time history of sound pressure during the collision of the ball is simulated with finite element analysis and validated with a simple experiment. Additionally an experimental setup was developed. Experimental setup enables the final validation of the numerical model to predict the sound which appears when balls impacts the rings of bearing.

• Keywords: ball bearing rolling elements numerical simulation analytical model acoustics sound impact