压电智能结构冲击定位方法的实验研究  

EXPERIMENTAL STUDY OF IMPACT LOCATION METHOD FOR PIEZOELECTRIC SMART STRUCTURE

作　　者：周晚林[1] 王鑫伟[1] 胡自力[1] 

机构地区：[1]南京航空航天大学智能材料与结构航空科技重点实验室

出　　处：《力学与实践》2003年第6期37-40,共4页Mechanics in Engineering

基　　金：国家自然科学基金(10072026);航空科学基金(01G52041)

摘　　要：基于压电智能结构,构成冲击荷载监测系统。冲击样本的应力波信号经Hilbert变换变为连续的瞬态时序信号后,提取时间和峰值等特征信息训练BP神经网络。在线监测时由神经网络根据压电响应信号映射冲击荷载的位置。实验表明,该方法定位精度高,稳定性好,用于层合板结构低能量冲击的健康监控是可行的。A system to monitor impact forces on piezoele-cric smart structures is constructed. The signals of the impact stress wave in time domain were transformed into momentary sequential time signals using Hilbert transform. Neural networks were established to extract different characteristics from these signals for automatic identification of impact location. Experimental results show that the method enjoys good accuracy and stability, which may find applications in the health monitoring of laminated structure damages caused by not very energetic impacts.

关 键 词：压电信号 HILBERT变换 冲击定位 冲击荷载监测系统 应力波信号 特征信息 

分 类 号：O347.3[理学—固体力学]