A Thesis Defense Session for MSc/Sara Mirshekari

//A Thesis Defense Session for MSc/Sara Mirshekari

Title: GEO communication satellites reliability analysis based on operational life

By Sara Mirshekari
Supervisor: Dr. Mehran Mirshams
Advisor: Dr. Ehsan Zabihian
Chairman: Dr. Saeid Irani (K. N. Toosi University of Technology), Dr. Hasan Naseh (Aerospace Research Institute)
September 11, 2018

The geosynchronous satellites as a complicated system with high lifetime in order to design and manufacturing need to certain and step by step process allocation and analysis of reliability. Regard to type and importance of mission complexity, operational longevity and also impossibility for repairing and maintaining at time of operation, it is very important to consider all aspects (dimensions) of failure and possible mistakes in function of subsystems and equipments in different modes and phases of mission. because of what mentioned above, it led to attract attention in order to diagnosing and analyzing failure sources in design and manufacturing phases and also regard to complexity of design and number of subsystems has caused to become difficult and complicated analysis and allocation of reliability.
The purpose of this thesis is, presentation a comprehensive process for analysis and allocation of satellite reliability according to functional life.The presented process is combination of statistical methods and FMECA, FTA, RBD. It has the ability to present process of reliability allocation for a complicated system in different phases of design. Accuracy of presented method in this thesis was validated with two ways included: analytic and numerical. For analytic validation was used Kaplan-Meier method and numerical validation was done by using of a sample satellite. Inaccuracy of this process was less than five precent.