Support Failure Prediction Of Optimal Sensor Placement

Structural damage identification based on vibration has broad application prospects in the field of structure for health monitoring. But its effectiveness is based on accuracy of modal testing, while the measurement locations and the number of transducers have a decisive effect on testing results. So, for improving the accuracy and reliability of results of failure prediction, the study about how to ensure the optimal number of transducers and how to place those on optimal locations have important theoretic sense and application value.This dissertation mainly studies three methods of optimal sensor placement of supporting failure prediction. The first is the Effective Independence Method (EFI) with the aim of maximizing the data information, the second is the Kinetic Energy Method(KEM) with the aim of measuring the maximal Kinetic Energy, the third is Sensitivity Analysis based on the component that models is sensitive to the stiffness . Based on merits or shortage of those, An improved algorithm- the Effective Independence Driving-Point Residue (EFI-DPR) method is given for the shortages of the above two methods which are the Effective Independence Method (EFI) and the Kinetic Energy Method(KEM). The improved optimal algorithm using Driving-Point Residue coefficient reflecting the weight of the kinetic energy updates the Effective Independence Method with the aim of maximizing spatial independent, the sensor placement is much more integrating optimal than before. Finally, Using Modal Assurance Criterion, Mean Error Minimum Criterion was based on the error between the FE model and the cubic spline interpolated mode shapes and the best ability to withstand the noise pollution Criterion validates the efficiency of this method by numerical analysis for a three span continuous girder deck slab structure. The results of numerical analysis show the optimization method proposed in this dissertation is proved a better method.In order to explain the efficiency and application of the method which this dissertation is proposed, take 161 spatial truss stayed bridge as a r applying research object, First establish the integral finite element model of the spatial truss and do an...