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Evaluating the Method of Component Mode Synthesis (CMS)for a Central Beam a with Four Side Beams

Mahdi Maghami | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56694 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan; Mohammad Navazi, Hossein
  7. Abstract:
  8. This research investigates the possibility of using the component mode synthesis (CMS) method in experimentation. It should be noted that the original idea for this project originated from an industrial problem. The main issue in this problem was the lack of sufficient equipment to conduct tests on very large structural modes and the high computational cost for their analysis. Therefore, a test platform was constructed using a scaled-down sample (approximately 1:25) with connections that closely resembled real connections. This assembly was then tested separately, and the results were compared with analytical analyses. After updating and correcting the model in several stages, the structure gradually took shape, and in each stage, testing and comparison were performed. In this research, both traditional assembly analysis and modal analysis using the CMS method were carried out. Additionally, the two-component part of this structure was calculated using the results obtained from the experiment for each component, using CMS equations and a developed code. Subsequently, by comparing the results of these two analyses and experiments, the findings were summarized, and recommendations for testing such assemblies were provided. In summary, this method involves testing and analyzing substructures, examining the correct software modeling of connections, and utilizing CMS software techniques for the modal analysis of assembly sets. The innovations of this research include the use of practical connections in the test platform, as well as the number of components compared to previous limited studies
  9. Keywords:
  10. Structure Decomposition ; Substructures ; Frequency Response ; Modal Properties ; Components Mode Synthesis ; Experimental Method

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