Bir iletişim uydusunda titreşim test sonuçları kullanılarak sonlu elemanlar modelinin iyileştirilmesi

In this thesis, the vibration analysis of a communication satellite is performed, and the improvement of the finite element model by using vibration test results is presented. First, the satellite finite element model is generated using MSC/PATRAN and MSC/NASTRAN commercial software. With the natural frequency and frequency response analysis, the expected frequency values and response amplitudes in accelerometers are calculated in vibration tests. The results obtained in the vibration test are compared with the analysis results using the HYPERGRAPH commercial software and their similarity with the modal assurance criteria calculation, which is developed using the FORTRAN programming language. The frequency values converged to the measured values as a result of the finite element model improvement, which is performed using error sensitivity assessment at the relevant frequencies.