Experimental Case Studies on Uncertainty Quantification in Structural Dynamics
Adhikari, S. Lonkar, K. and Friswell, M. I.
Proceedings of the 25th International Modal Analysis Conference
(IMAC-XXV), February 2007, Orlando, Florida, USA.
The consideration of uncertainties in numerical models to obtain
the probabilistic descriptions of vibration response is becoming
more desirable for industrial scale finite element models. Broadly
speaking, there are two `parts' in this problem. The first is the
quantification of parametric and nonparametric uncertainties
associated with the model and the second is the propagation of
uncertainties through it. While the second part has been
extensively researched in the past two decades (e.g., the
stochastic finite element method), it is only relatively recently
the first part is being considered seriously. This paper considers
the `first part' and is aimed at gaining more insights into the
nature of uncertainties in medium and high frequency vibration
problems. Results from a experimental study that may be used for
this purpose are discussed in detail. The experiment is on a
fixed-fixed beam with twelve masses placed at random locations.
The total amount of `random masses' is less than 2\% of the total
mass of the beam. This experiment is aimed at simulating `random
errors' in the mass matrix. The probabilistic characteristics of
the frequency response functions are discussed in the low, medium
and high frequency ranges.
BiBTeX Entry
@INPROCEEDINGS{cp26,
AUTHOR={S. Adhikari and K. Lonkar and M. I. Friswell},
TITLE={Experimental case studies on uncertainty quantification in structural dynamics},
BOOKTITLE={Proceedings of the 25th International Modal Analysis Conference (IMAC-XXV)},
YEAR={2007},
Address={Orlando, Florida, USA},
Month={February},
Note={}
}
by Sondipon Adhikari