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。

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A modified model combining electro-mechanical impedance (EMI) technique and reverberation matrix method (RMM) is presented to quantitatively correlate crack parameters with piezoelectric signatures through the proper dynamic analysis of a smart cracked beam. The structural members of cracked beams are modeled as Timoshenko beams for flexural motion as well as the cracks are treated as massless rotational springs. For a structural member with surface-bonded PZT wafers, a coupled structural system is considered. Then, an analytical expression of impedance involving information of cracks is derived. Based on this model, comparison study is implemented with self-conducted experiment and existent research results. Finally，the effect of some physical parameters including crack information on EMI signatures is also investigated for structural health monitoring.