Numerična in eksperimentalna modalna analiza elektromotorja SPOKE 240

Lampič, Benjamin (author), Slavič, Janko (mentor), Boltežar, Miha (co-mentor)

Pri razvoju prototipnega motorja SPOKE 240 smo predvidevali, da se bodo pri obratovanju pojavile težave z resonančnimi nihanji in povečanim hrupom. Motor z neustrezno lastno dinamiko kljub dobremu izkoristku ni dober ne za proizvajalca ne za kupca, ker je glasen, oddaja vibracije in ima zaradi utrujenosti materiala krajšo življenjsko dobo. Lastno dinamiko strukture lahko napovedujemo s specializirano programsko opremo, vendar pa po navadi teoretične napovedi precej odstopajo od realnih vrednosti. V ta namen smo prototipni motor analizirali numerično in eksperimentalno ter numerične rezultate s prilagajanjem parametrov modela čim bolj približali eksperimentalnim. Rezultat je model z lastno dinamiko, ki je zadovoljivo podobna realni. Na takem modelu lahko nato preizkušamo geometrijske in materialne spremembe, ki bi izboljšale lastno dinamiko motorja. Tak način analize je ugodnejši predvsem zaradi krajšega časa razvoja motorja in znižanja stroškov razvoja.

• Language: Slovenian
• Keywords: vibracije, resonanca, hrup, življenjska doba, frekvenčna prenosna funkcija, numerični model, eksperiment, ujemanje
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-94845
• Publication date in RUL: 08.09.2017

Secondary language

• Language: English
• Title: Numerical and experimental modal analysis of electromotor SPOKE 240

Abstract

During development of electromotor SPOKE 240 it was assumed that there will be certain problems with resonant vibrations and increased noise during operation. A motor with inappropriate dynamic properties is not suitable for the manufacturer nor the customer because it is loud, emits vibrations and has a shorter life expectancy due to increased vibration fatigue. Structural dynamics could be predicted with specialised software; however, theoretical predictions usually deviate from measured values. That is the main reason why the motor was analysed numerically and experimentally in this work. The numerical data were fitted to the experimentally acquired data with the use of numerical model parameters updating. This results in a numerical model with structural dynamics sufficiently similar to the real model. Various geometric and material changes can then be applied to improve numerical model. This could also improve structural dynamics of motor and provide shorter development time and lower costs of development.

• Keywords: vibrations, resonance, noise, life expectancy, frequency transfer function, numeric model, experiment, matching