Optimal Placement of Triaxial Accelerometers Using Modal Kinetic Energy Method

Abstract:

Modal kinetic energy (MKE) method gives a measure of the dynamic contribution of each finite element model physical degree of freedom to each of the target mode shapes, and provides a rough idea where the maximum responses could be measured. It could help to select those sensor positions with possible large amplitudes, and to increase the signal to noise ratio, which is critical in harsh and noisy circumstances. Kammar proposed a new optimal placement method of triaxial accelerometers based up on the effective independence algorithm (EfI3), which places triaxial accelerometers as single units in an optimal fashion. On the basis of EfI3, this paper fully considers the mutual influence of three directions and makes some improvements for the traditional MKE method. A novel optimal placement method of triaxial accelerometers called MKE3 is proposed which is proved rational and effective by analysis the relationship between the EfI algorithm and MKE method.

• Periodical: Applied Mechanics and Materials (Volumes 166-169)
• Pages: 1583-1586
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.166-169.1583
• Online since: May 2012
• Authors: Ting Hua Yi, Xiang Wang, Hong Nan Li
• Keywords: Effective Independence Algorithm, Modal Kinetic Energy, Optimal Sensor Placement, Triaxial Accelerometer

References

[1] D.C. Kammer, M.L. Tinker: Optimal placement of triaxial accelerometers for modal vibration tests (Conference on Structural Dynamics, Los Angeles CA 2002)

[2] D.C. Kammer: Journalof Guidance Control Dynamics Vol. 14 (1991), pp.251-259

[3] W.L. Poston, R.H. Tolson: Journal of Guidance Vol. 15 (1992), pp.1513-1514

[4] W.Heylen, S.Lammens, P.Sas: Modal Analysis Theory and Testing (Katholieke Unversiteit Leuven, Belgium 1998 )

[5] F.E. Udwadia: Journal of Engineering Mechanics-ASCE Vol 120 (1994), pp.368-390