Random Vibration Analysis of Deployable Solar Panels
Author
Lin, Yang-Che
Term
4. term
Education
Publication year
2018
Abstract
Projektet adresserer, hvordan foldede, udfoldelige solpaneler på nanosatellitter reagerer på tilfældige vibrationer under raketopsendelse, hvor træthed og muligt tab af kontakt ved støttepinde kan opstå. Med udgangspunkt i lineær analyse og stationær tilfældig excitation gennemgås grundlæggende vibrations- og sandsynlighedsteori, herunder modalanalyse og frekvensdomænemetoder med effektspektraltæthed (PSD) og frekvensresponsfunktion (FRF). For at udnytte superpositionsprincippet opdeles systemet i to delsystemer: ét med central forspændingskraft og ét med tilfældig baseexcitation; dermed kan den kraft, som vibrationerne inducerer, sammenlignes med forspændingen for at vurdere risikoen for kontaktbrud. Der præsenteres analytiske modeller for plader (suppleret af verificerende bjælkestudier) og gennemføres parameterstudier af modeshape, placering, dæmpning og materialer for at belyse acceleration, forskydning og kraftrespons. Konkrete kvantitative resultater er ikke indeholdt i dette uddrag; rapporten opstiller rammeværket og de analytiske udtryk, der kan støtte dimensionering og design af mere robuste solpaneler.
This project examines how folded, deployable solar panels on nanosatellites respond to random vibrations during rocket launch, where fatigue and potential loss of contact at support pins can occur. Using a linear framework with stationary random excitation, it reviews core vibration and probability concepts, including modal analysis and frequency-domain methods with power spectral density (PSD) and frequency response functions (FRF). Leveraging superposition, the system is split into two subsystems: one with a central pretension force and one with random base excitation, enabling comparison of vibration-induced forces to the pretension to assess the risk of contact loss. Analytical plate models (supported by beam verifications) are presented, and parametric studies on mode shapes, location, damping, and material properties are conducted to characterize acceleration, displacement, and force responses. Specific quantitative findings are not provided in this excerpt; instead, the report establishes the analytical framework and expressions that support the design of more robust solar panels.
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