A Stochastic Multidomain Approach for Mid-frequency Vibration Problems

Adhikari, S. and Friswell, M.I. (2018) A Stochastic Multidomain Approach for Mid-frequency Vibration Problems. In: Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - Uncertainty in Structural Dynamics (USD2018), Leuven, Belgium, Sept 2018, pp. 5001-5010.

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Abstract

The consideration of uncertainty becomes increasingly necessary for complex engineering structures. For structural dynamic systems, the approach to model uncertainty often depends on the frequency of excitation. For low-frequency vibration problems, parametric uncertainty model is normally used. Random field or random variables can be used to model uncertain parameters and stochastic finite element method can be used to propagate uncertainty. For high-frequency vibration problems, nonparametric uncertainty model is normally used. Random matrix models, such as those based on Wishart random matrices, can be used for this purpose. However, in the majority of practical engineering problems, both types of uncertainties need to be modelled simultaneously as one expects a mixture of wavelengths. This paper proposes a new approach to consider multiple wavelength-scales by combining parametric and nonparametric uncertainty models.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Adhikari, Professor Sondipon
Authors: Adhikari, S., and Friswell, M.I.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics
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