Operational Modal Analysis on a 3D Scaled Model of a 3-Storey Aluminium Structure

Authors

  • M. Fadhil Shazmir

  • N. Ayuni Safari

  • M. Azhan Anuar

  • A. A.Mat Isa

  • Zamri A.R

Received date: November 30, 2018

Accepted date: November 30, 2018

Published date: November 30, 2018

DOI:

https://doi.org/10.14419/ijet.v7i4.27.22485

Keywords:

Operational Modal Analysis, Frequency Domain Decomposition, Dynamic characteristics, Stochastic Subspace Identification, Enhanced Frequency Domain Decomposition, 3D Aluminium Structure

Abstract

Obtaining a good experimental modal data is essential in modal analysis in order to ensure accurate extraction of modal parameters. The parameters are compared with other extraction methods to ascertain its consistency and validity. This paper demonstrates the extraction of modal parameters using various identification algorithms in Operational Modal Analysis (OMA) on a 3D scaled model of a 3-storey aluminium structure. Algorithms such as Frequency Domain Decomposition (FDD), Enhanced Frequency Domain Decomposition (EFDD) and Stochastic Subspace Identification (SSI) are applied in this study to obtain modal parameters. The model test structure is fabricated of aluminium and assembled using bolts and nuts. Accelerometers were used to collect the responses and the commercial post processing software was used to obtain the modal parameters. The resulting natural frequencies and mode shapes using FDD method are then compared with other OMA parametric technique such as EFDD and SSI algorithm by comparing the natural frequencies and Modal Assurance Criterion (MAC). Comparison of these techniques will be shown to justify the validity of each technique used and hence confirming the accuracy of the measurement taken.  

 

 

References

  1. [1] M. M. Derriso, C. D. McCurry, and C. M. Schubert Kabba (2016),, Structural Health Monitoring (SHM) in Aerospace Structures., Elsevier,

    [2] A. Gómez González and S. D. Fassois (2016), A Supervised Vibration-Based Statistical Methodology for Damage Detection under Varying Environmental Conditions & its Laboratory Assessment with a Scale Wind Turbine Blade, J. Sound Vib., vol. 366, pp. 484–500,

    [3] M. Almeida, P. Singhal, A. Sequeira, R. Church, and V. Srivastava (2015), An Integrated System For Health Monitoring Of Civil Infrastructures Using A Sensor Network, IEEE Canada International Humanitarian Technology Conference (IHTC2015), pp. 1–4.

    [4] D. Liang and S. Yuan (2015), Structural Health Monitoring System Based On Multi-Agent Coordination And Fusion For Large Structure, Adv. Eng. Softw., vol. 86, pp. 1–12,

    [5] F. Lorenzoni, F. Casarin, M. Caldon, K. Islami, and C. Modena (2015), Uncertainty Quantification in Structural Health Monitoring: Applications on Cultural Heritage Buildings, Mech. Syst. Signal Process. vol. 66, pp. 268–281.

    [6] Z. W. Chen, Q. L. Cai, and J. Li, (2016), Stress Influence Line Identification Of Long Suspension Bridges Installed With Structural Health Monitoring Systems, Int. J. Struct. Stab. Dyn, vol. 16, no. 04, p. 1640023.

    [7] C. Chisari, C. Bedon, and C. Amadio (2015), Dynamic And Static Identification Of Base-Isolated Bridges Using Genetic Algorithms, Eng. Struct. vol. 102, pp. 80–92.

    [8] G. Comanducci, F. Ubertini, and A. L. Materazzi (2015), Structural Health Monitoring Of Suspension Bridges With Features Affected By Changing Wind Speed, J. Wind Eng. Ind. Aerodyn., vol. 141, pp. 12–26.

    [9] M. T. Yarnold and F. L. Moon (2015), Temperature-Based Structural Health Monitoring Baseline For Long-Span Bridges, Eng. Struct., vol. 86, pp. 157–167.

    [10] H. A. G.F. Sirca Jr. (2012, System Identification in Structural Engineering.

    [11] M. Batel, G. S., M. N., and H. Herlufsen (2003), Ambient Response Modal Analysis on A Plate Structure, in Proceedings of 21st International Modal Analysis Conference (IMAC-XXI).

    [12] M. Goursat, M. Döhler, L. Mevel, and P. Andersen (2011), Crystal Clear SSI For Operational Modal Analysis of Aerospace Vehicles, in Structural Dynamics, Volume 3 SE - 125, T. Proulx, Ed. Springer New York, pp. 1421–1430.

    [13] A. Skafte and R. Brincker (2013), Estimation Of Unmeasured DOF’s On A Scaled Model Of A 4-Storey Building, Conference Proceedings of the Society for Experimental Mechanics Series, vol. 6, pp. 347–353.

    [14] R. Brincker and C. E. Ventura (2015), Introduction to Operational Modal Analysis.

Downloads

How to Cite

Fadhil Shazmir, M., Ayuni Safari, N., Azhan Anuar, M., A.Mat Isa, A., & A.R, Z. (2018). Operational Modal Analysis on a 3D Scaled Model of a 3-Storey Aluminium Structure. International Journal of Engineering and Technology, 7(4.27), 78-82. https://doi.org/10.14419/ijet.v7i4.27.22485

Received date: November 30, 2018

Accepted date: November 30, 2018

Published date: November 30, 2018