Study of Improved Optimal Sensor Placement Methods based on Effective Independence

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (6) : 54-62.

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Study of Improved Optimal Sensor Placement Methods based on Effective Independence

LIU Wei1,2 GAO Wei-cheng1 LI Hui2 SUN Yi1

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Abstract

Optimal sensor placement technique plays a key role in structural health monitoring in civil engineering. Based on the advantages and disadvantages of effective independence (EI) and modal kinetic energy (MKE) methods, two improved optimal sensor placement methods which are Effective Independence - Average Acceleration Amplitude (EI-AAA) method and Effective Independence - Modal Kinetic Energy (EI-MKE) method are proposed in this paper. They use the average acceleration amplitude (AAA) and modal kinetic energy (MKE) respectively to modify optimal sensor placement results obtained by the effective independence method. The obtained optimal sensor locations using the two improved methods (EI-AAA and EI-MKE) are compared with those gained by EI method, MKE method, effective independence driving point residue (EFI-DPR) method (Ref.[12] and Ref.[13]). The advantage and disadvantage of these six methods are demonstrated by six evaluation criteria which are modal kinetic energy (MKE), average acceleration amplitude (AAA), Fisher information matrix (FIM), condition number of truncated modal shape matrix and modal assurance criterion (MAC). A computational simulation of steel cross beam sunroof structure has been implemented to demonstrate the feasibility of the two improved methods and other four methods. The results showed that some innovations proposed in this paper are effective and reliable. The two improved optimal sensor placement methods (EI-AAA method and EI-MKE method) can not only make the truncated mode shapes as linearly independent as possible but also enable the measured modal kinetic energy to maintain the maximum value. They are more feasible in these six optimal sensor placement methods.

Key words

optimal sensor placement / effective independence / modal kinetic energy / average acceleration amplitude / modal assurance criterion

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LIU Wei;GAO Wei-cheng LI Hui SUN Yi. Study of Improved Optimal Sensor Placement Methods based on Effective Independence[J]. Journal of Vibration and Shock, 2013, 32(6): 54-62