基于回传射线矩阵法的含裂缝智能梁的动态特性  

Dynamic analysis of a smart cracked beam based on the reverberation matrix method

作　　者：严蔚[1] 袁丽莉[1] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《振动与冲击》2010年第6期109-114,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50778161);浙江省自然科学基金资助项目(Y107796);宁波市自然科学基金资助项目(2008A610101)

摘　　要：基于压电阻抗(EMI)技术和回传射线矩阵法(RMM)对含裂缝智能梁进行了振动特性研究,提出了修正的理论模型,使得压电阻抗信号能与结构裂缝的各物理参数定量地联系起来。采用Timoshenko梁理论描述了含裂缝梁的弯曲振动特性。结构裂缝模拟为具有一定刚度的转动弹簧。对于黏贴有压电片的结构元件,把它作为压电片-粘结剂-主体梁这一耦合结构系统加以考察。最后推导出包含了结构裂缝信息的压电阻抗的解析表达式。基于该模型,与实验数据以及其它研究结果进行了对比分析。最后,考察了各物理参数对压电阻抗信号的影响。A modified model combining electro-mechanical impedance(EMI) technique and reverberation matrix method(RMM) was presented to quantitatively correlate crack parameters with piezoelectric signatures through the proper dynamic analysis of a smart cracked beam.The structural members of the cracked beam were modeled as Timoshenko beams with flexural motion,while the cracks were treated as massless rotational springs.For a structural member with surface-bonded PZT wafers,it can be considered as a coupled structural system.Then,an analytical expression of impedance involving information of cracks was derived.Based on this model,comparison study was implemented between self-conducted experiment and existent research results.Finally,the effects of some physical parameters in regard to crack information on EMI signatures were investigated for structural health monitoring.

关 键 词：压电阻抗 回传射线矩阵法 裂缝识别 耦合系统 

分 类 号：TU323.3[建筑科学—结构工程]