Research on optimal sensor placement using effective two-Step arrangement approach
Optimal sensor placement for the damage detection of structures is very important in structural health monitoring for the purpose of minimizing instrumentation and observation cost, and detecting structural-change (damage) in an early stage. This paper proposes an effective Two-Step Arrangement method for sensors optimization, which is suitable for on-line monitoring scheme. In the first step, we calculate the utmost distance of sensors on a special structure by principle of elastic wave propagation and determine the preliminary number of sensors; in the second step, optimized sensors placement is ultimately determined by Effective Independence Driving-Point Residue (EFI-DPR) method which uses utmost distance above as a constrained condition. In essence, the DPR is a weighting factor of effective independence distribution (EID) vector. This methodology concentrates the sensor positions in the high energy content regions resulting in the sensors’ being quasi-uniformly spaced and symmetrically deployed. This paper also compares our new EFI-DPR method of sensor placement with the two traditional methods under three different modal criteria. The first criterion is based on the mean square error calculated with both the FE model and the cubic spline interpolated mode shapes considered. The second criterion is based on the measured information content of each sensor location to investigate on the strength of the acquired signals and their ability to withstand the noise pollution. And the third criterion is the famous modal assurance criterion (MAC). Finally we verify the Two-Step arrangement approach on an intelligent space truss as a numerical case. The results successfully demonstrated that the new method (EFI-DPR) is an optimal method better than the other two traditional ones.
Optimal sensor placement Modal assurance criterion Independence driving-point residue
Ziyan Wu Xiaohong Jian Yunju Yan
School of Mechanics,Civil and Architecture Northwestern Polytechnical University,Xian 710072,China
国际会议
第六届国际振动工程会议(The 6th International Conference on Vibration Engineering)(ICVE’ 2008)
大连
英文
2008-06-04（万方平台首次上网日期，不代表论文的发表时间）