It is possible to estimate the strain response of a structure in unmeasured points by the use of operational modal analysis and modal expansion. Both techniques are based on the assumption that the system is linear. However, this is not always the case since nonlinear elements often violate this assumption. In this paper, the precision of estimating the strain response of a nonlinear system is investigated using the operational response of numerical simulations. Local nonlinearities are introduced by adding friction to the test specimen and this paper finds that this approach of strain estimation can still predict the strains with high precision.
|Title of host publication||Nonlinear Dynamics, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series|
|Publication status||Published - 2018|
|Event||36th International Modal Analysis Conference - Orlando, United States|
Duration: 12 Feb 2018 → 15 Feb 2018
Conference number: 36
|Conference||36th International Modal Analysis Conference|
|Period||12/02/2018 → 15/02/2018|
- Operational modal analysis
- Strain estimation
- Modal expansion
- Structural health monitoring
- Non-linear dynamics
Tarpø, M., Friis, T., Nabuco, B., Amador, S., Katsanos, E., & Brincker, R. (2018). Operational Modal Analysis based Stress Estimation in Friction Systems. In G. Kerschen (Ed.), Nonlinear Dynamics, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series (Vol. 1, pp. 143-153). Springer.