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استفاده از روش سنتز مود زیر سازه ها برای تحلیل مودال دو شفت دوار با اتصال بلبرینگ و ارزیابی تجربی
باقری نوکاشتی، فائزه Bagheri Nokashti, Faezeh
Use of Component Mode Synthesis Method for Modal Analysis of Two Rotating Shafts Connected by Bearings and Experimental Evaluation
Bagheri Nokashti, Faezeh | 2025
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 58355 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Mohammad Navazi, Hossein
- Abstract:
- In this study, the modal analysis of a rotating system consisting of two shafts connected via a bearing joint is investigated using the Component Mode Synthesis (CMS) method. This method, as one of the advanced techniques in vibration analysis and model order reduction for mechanical and dynamic systems, enables the accurate modeling of complex structures with low computational cost. In the first step, the two substructures were independently subjected to modal analysis, and their modal properties including natural frequencies, mode shapes, and other dynamic characteristics were extracted. Then, using the CMS algorithm, the results from the separate analyses were combined to construct the full model of the system. To validate the numerical results, an experimental modal analysis was conducted using an impact hammer for excitation and accelerometers for response measurement. The collected data were analyzed as Frequency Response Functions (FRFs) and compared with the numerical results. The close agreement between the analytical and experimental results with less than 5% error in natural frequencies and highly similar mode shapes confirms the high accuracy and reliability of the CMS method in reconstructing the modal properties of mechanical systems. Moreover, this method significantly reduces computational load, analysis time, and processing resource requirements, making it especially useful for analyzing rotating systems such as aerospace structures and industrial rotors, where full-scale modeling is highly complex and costly. Additionally, the ability to analyze each substructure independently and later combine them in the complete model allows for flexible design and optimization, enabling local modifications without the need to reanalyze the entire system. The results of this research demonstrate that the combined use of the Component Mode Synthesis method and experimental testing provides an accurate, fast, and flexible framework for vibration analysis of complex systems and for reliably reconstructing their modal properties
- Keywords:
- Modal Analysis ; Vibrational Analysis ; Modal Properties ; Experimental Test ; Substructures ; Substructure Modal Synthesis ; Experimental Evaluation
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