Prediktering av tändpuls med hjälp av finita elementmetoden
Prediktering av tändpuls med hjälp av finita elementmetoden
Prediktering av tändpuls med hjälp av finita elementmetoden
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Innehållsförteckning<br />
1 Inledning ................................................................................................................. 1<br />
1.1 Bakgrund .......................................................................................................... 1<br />
1.2 Problembeskrivning.......................................................................................... 1<br />
1.3 Målsättning ....................................................................................................... 2<br />
2 Litteraturstudie ........................................................................................................ 3<br />
2.1 Piezoelektriska keramer.................................................................................... 3<br />
2.1.1 De piezoelektriska konstanterna............................................................... 4<br />
2.2 Piezoelektrisk analys <strong>med</strong> Finita Element Metoden i Ansys ........................... 7<br />
2.2.1 Hantering <strong>av</strong> piezoelektrisk materialdata i Ansys .................................. 11<br />
2.2.2 Element för piezoelektrisk analys .......................................................... 15<br />
2.2.3 Övriga viktiga punkter............................................................................ 16<br />
3 Praktisk provning .................................................................................................. 17<br />
3.1 Praktiskt kultest, ”Testfall 1” ......................................................................... 18<br />
3.1.1 Testutförandet......................................................................................... 18<br />
3.1.2 Resultat ................................................................................................... 19<br />
3.2 Praktiskt kultest, ”Testfall 2” ......................................................................... 20<br />
3.2.1 Testutförande.......................................................................................... 20<br />
3.2.2 Kontroll <strong>av</strong> mätutrustningens påverkan.................................................. 21<br />
3.2.3 Resultat ................................................................................................... 22<br />
4 Finit elementanalys i Ansys .................................................................................. 25<br />
4.1 Kontaktanalys ................................................................................................. 25<br />
4.1.1 Resultat ................................................................................................... 27<br />
4.1.2 Slutsats Kontaktanalys............................................................................ 29<br />
4.2 Simulering <strong>av</strong> ”Testfall 1” <strong>med</strong> Ansys........................................................... 29<br />
4.2.1 Geometri ................................................................................................. 29<br />
4.2.2 Materialdata............................................................................................ 30<br />
4.2.3 Element och elementnät.......................................................................... 32<br />
4.2.4 Randvillkor och kontakter ...................................................................... 32<br />
4.2.5 Övriga inställningar för simuleringen..................................................... 35<br />
4.2.6 Resultat ................................................................................................... 36<br />
4.3 Simulering <strong>av</strong> ”Testfall 2”.............................................................................. 39<br />
4.3.1 Geometri ................................................................................................. 39