网壳结构健康监测中的传感器优化布置

针对网壳结构健康监测提出了一种以损伤可识别性与模态可观测性相协调为目标的传感器优化布置的方法.由于模态数目的选取对基于损伤灵敏度分析的传感器优化布置有很大的影响,因此本文建立了一种同时包含模态独立性信息和损伤灵敏度信息的Fisher信息矩阵,并选取合适的模态数目,然后发展了一种以信息矩阵最大和条件数最小为准则的多目标优化算法.空间网壳数值算例表明,本文提出的传感器优化方法能简单、有效地为空间结构传感器优化布置提供可行方案.

Optimum sensor placement for health monitoring of latticed shell structure

A method of prioritizing sensor locations for health monitoring in latticed shell structure is presented. It is based on the harmony between damage identifiability and modal observability. First of all, an object function was set up including the information of mode independence and damage sensitivity. In addtion, the number of modes affects greatly optimum sensor placement which is based on an analysis of damage sensitivity, hence, the reasonable number of modes would be decided. After that, a multiple objective optimization algorithm for sensor locations is proposed with the criterion of minimum condition number of coefficient matrix and maximum 2-norm of the fisher information matrix. The numerical example of a latticed shell structure shows that this approach effectively provide references for optical sensor placement of the latticed shell structure.