u2.07.03 Conducting a structural modification study using measured data

Summary:

The purpose of this document is to describe the implementation of a structural modification study based on measured data. The method used is based on the substructuring technique. The first substructure (initial structure) is obtained from the eigenmodes identified experimentally and the second substructure (modification made) is modelled numerically by finite elements.

• 1. background
• 2. Theoretical reminder
  • 2.1. The « measure » model
  • 2.2. The « support » model
  • 2.3. The « modification » model
  • 2.4. Coupling of the two substructures
  • 2.5. Retro-projection of the field onto the measurement points
  • 2.6. Expansion base quality control
• 3. Implementation of the structural modification calculation, example of the sdll137a and sdll137b test cases
  • 3.1. The « measure » model
  • 3.2. The « support » model
  • 3.3. Coupling measurement and modification
  • 3.4. Calculation on the coupled model
  • 3.5. Retro-projection on the measured model
  • 3.6. Expansion base quality control
• 4. Implementation of the structural modification calculation, example of the sdll137e test case
  • 4.1. Experimental structure model
  • 4.2. Support model
  • 4.3. Expansion of experimental modes
  • 4.4. Creation of the macro element associated with the structure
  • 4.5. Model modification
  • 4.6. Assembly of the substructures, and calculation of the natural frequencies of the modified structure
• 5. Conclusion
• 6. Bibliography