Structural Health Monitoring under Nonlinear Environmental or Operational Influences
Author
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-05-29
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Vibration-based structural health monitoring is based on detecting changes in the dynamic characteristics of the structure.
It is well known that environmental or operational variations can also have an influence on the vibration properties.
If these effects are not taken into account, they can result in false indications of damage.
If the environmental or operational variations cause nonlinear effects, they can be compensated using a Gaussian mixture model (GMM) without the measurement of the underlying variables.
The number of Gaussian components can also be estimated.
For the local linear components, minimum mean square error (MMSE) estimation is applied to eliminate the environmental or operational influences.
Damage is detected from the residuals after applying principal component analysis (PCA).
Control charts are used for novelty detection.
The proposed approach is validated using simulated data and the identified lowest natural frequencies of the Z24 Bridge under temperature variation.
Nonlinear models are most effective if the data dimensionality is low.
On the other hand, linear models often outperform nonlinear models for high-dimensional data.
American Psychological Association (APA)
Kullaa, Jyrki. 2014. Structural Health Monitoring under Nonlinear Environmental or Operational Influences. Shock and Vibration،Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1048018
Modern Language Association (MLA)
Kullaa, Jyrki. Structural Health Monitoring under Nonlinear Environmental or Operational Influences. Shock and Vibration No. 2014 (2014), pp.1-9.
https://search.emarefa.net/detail/BIM-1048018
American Medical Association (AMA)
Kullaa, Jyrki. Structural Health Monitoring under Nonlinear Environmental or Operational Influences. Shock and Vibration. 2014. Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1048018
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1048018