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Modal and Fatigue Analysis of the Stratotimer
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Fatigue analysis of the printed circuit boards (PCBs) of an avionic instrument has been analyzed. The natural frequency and transmissibility has been estimated through analytical approach and finite element approach with Solid- Works and experimentally. Fatigue analysis damage has been obtained with three methods: Steinberg Stress approach, Steinberg Relative Displacement approach and Dirlik method. The analysis indicates that the solder that holds the CPU on the control unit is critical for the fatigue life. The results show that each method is far from the critical CDI value of 0:7 and therefore the design could be optimized.

Abstract [sv]

 En utmattningsanalys har utförts av ett kretskort (printed circuit board” PCB) i en avioniskt kronograf, kallad Stratotimer. Egenfrekvenser och överföring har uppskattats analytiskt, nummeriskt med finita element i SolidWorks samt experimentellt. Utmattningsrisk har predikterats med tre metoder: Steinbergs spänningskriterium, Steinbergs relativa förskjutningskriterium och Dirlikmetod. Analysen indikerar att den lödning som håller fast CPUn på kontrollenheten är kritisk för utmattningslivet. Resultaten från de ollika metoderna skiljer sig något men samtliga metoder indikerar en stor marginal till det kritiska design indexet (CDI) på 0,7. Därmed bör det finnas utrymme för optimering av Stratotimern.

Place, publisher, year, edition, pages
2019. , p. 32
Series
TRITA-SCI-GRU ; 2019:325
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262042OAI: oai:DiVA.org:kth-262042DiVA, id: diva2:1360702
External cooperation
Thommen aircraft equipment
Examiners
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14Bibliographically approved

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CiteExportLink to record
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  • apa
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