复合材料结构实时撞击监测系统

A Real-time Impact Monitoring System for Composite Structures

为实时监测并评估发生在复合材料结构上的外部低速撞击,研制了一套基于压电传感器的被动式传感系统。系统包括分布式压电传感器网络、便携式采集硬件及分析软件。压电传感器网络覆盖结构被监测区域,并实时在线监测由于结构撞击而产生的应力波;多通道采集硬件并行采集各传感器信号,并以直接存储器访问(DMA)形式与分析软件进行数据交换;撞击事件评估采用了系统辨识技术,分析软件利用集成的系统辨识模型及获得的实时传感器数据对撞击位置和撞击载荷进行反问题求解。实验结果表明,研制的被动式传感系统能够准确辨识发生在复合材料结构上的撞击事件,并可有效估计撞击位置及撞击载荷历程。

A passive sensing system using piezoelectric sensors was developed for real-time monitoring and esti- mating the external low-velocity impact on composite structures. The system included distribute piezoelectric sensor network, portable acquisition hardware and data analysis software. Piezoelectric sensor network covered the focus ar- eas of the structure,and real-time in situ monitoring the stress waves generated by the impact. Multi-channel acqui- sition hardware could parallel acquisition and recorded the sensor signals and exchange data with analysis software u- sing direct memory access （DMA） technique. For evaluation the impact events,an improved system-identification method was integrated in the analysis software. Combining the integrated system-identification model and the ob- tained real-time sensor data, the analysis software would estimate the impact location and perform the inverse recon- struction of the impact force. Testing results showed that the developed passive sensing system could exactly identify the impact events on composite structures, and estimated the location and force time history effectively.