An improved effective independent method based on multi energy parameters for optimal sensor placement

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (24) : 25-31.

FAN Hengcheng，YU Ling

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Abstract

To solve the problem that the effective independent method is easy to lose the higher energy measurement points and the energy method is easy to concentrate on the higher energy measurement points, which leads to the loss of the important modal information of the structure in the optimal sensor placement of structural health monitoring, an improved effective independent method with multi energy parameters (EI-MEP) was proposed by introducing the modified effective independent method of modal kinetic energy and modal strain energy.The EI-MEP method proposed in this paper, the effective independent method, and three existing improved methods were compared by using the evaluation criteria through numerical simulations on a space truss structure and experimental verifications on a cantilever beam with rectangular section.The results show that, the EI-MEP method not only has good accuracy in low-order modal identification, but also has advantages in selecting a small number of sensors, which can ensure the greater linear independence of the mode vector, and is the most effective method among these five optimal sensor placement methods.

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optimal sensor placement / effective independence method / energy parameter / modal analysis

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FAN Hengcheng，YU Ling. An improved effective independent method based on multi energy parameters for optimal sensor placement[J]. Journal of Vibration and Shock, 2020, 39(24): 25-31

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