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Design and Modeling of an Isolator System for Reducing Transmitted Vibration Levels in Space System

Daryaei, Hamed | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57891 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saadat Foumani, Mahmoud; Ghoreishi, Mohammad Navid
  7. Abstract:
  8. Vibration control is one of the most critical aspects of designing space structures, as it can significantly impact the performance and operational lifespan of satellites. The launch phase is the most sensitive and critical stage in the satellite mission lifecycle, as intense vibrations are generated and transmitted to the satellite during this phase. To mitigate the severity of these transmitted vibrations, vibration isolators are employed. The objective of this study is to design and model a vibration isolator to control the vibrations transmitted from the launcher to the satellite during launch. To achieve this, an extensive investigation into vibration isolators used in the space industry is conducted. By comparing the advantages and disadvantages of various isolator types, a passive vibration isolator is selected for the present study. One of the isolators reviewed in the literature is chosen for further analysis. Subsequently, its static and dynamic behaviour is analysed using the finite element software ANSYS. The validation of the proposed isolator’s design and analysis process is carried out by comparing the analytical results of this study with the experimental reference data of the selected isolator. Finally, a vibration isolator model is proposed. A specific launcher is selected as the vibration source, and a widely used satellite type in the space industry is chosen as the system under study. The proposed isolator undergoes quasi-static acceleration, modal, sinusoidal vibration, random vibration, and shock analyses based on the ECSS space standard. This isolator not only meets the frequency requirements of the selected launch vehicle but also effectively reduces random vibrations by 75% in the longitudinal direction and 82.3% in the lateral directions. Furthermore, the analysis results indicate that the proposed isolator is feasible for manufacturing and operational use in the space industry
  9. Keywords:
  10. Elastomers ; Random Vibration ; Mechanical Shock ; Passive Isolator ; Passive Vibration Isolator ; Satellites ; Sinusoidal Vibrations

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