自制压电陶瓷传感器性能测试及其辨识混凝土开裂损伤试验

Performance test of self-made piezoelectric ceramic sensor andits experimental study on identifying crack damage of concrete

压电陶瓷作为一种灵敏度高、频响范围宽的传感器,在混凝土结构开裂损伤辨识中使用广泛。传统多采用水泥作为封装材料,存在传感器表面不平以致影响响应信号识别性能的缺陷,加之传统辨识方法存在无法准确辨识混凝土开裂损伤程度的问题。选用PZT-4型号压电陶瓷制成环氧树脂基压电陶瓷传感器,并对其谐振频率、稳定性和灵敏度进行了性能测试,开展基于小波包能量法的混凝土梁开裂损伤辨识模型试验。成果表明,自制环氧树脂基压电陶瓷传感器和所建能量评价指标具备辨识混凝土开裂损伤程度的可行性,可为应用压电陶瓷检测混凝土开裂损伤的相关技术提供借鉴。

As a sensor with high sensitivity and wide frequency response range,piezoelectric ceramics are widely used in the identification of cracking damage of concrete structures.Traditionally,cement was often used as the encapsulation material,which had the defect that the uneven surface of the sensor affected the identification performance of the response signal.In addition,the traditional identification method couldn't accurately identify the degree of concrete cracking damage.The PZT-4 type piezoelectric ceramic was used to make epoxy resin based piezoelectric ceramic sensor,and its resonance frequency,stability and sensitivity were tested.A model test of concrete beam crack damage identification based on wavelet packet energy method was carried out.The results showed that the self-made epoxy resin based piezoelectric ceramic sensor and the constructed energy evaluation index were feasible to identify the crack damage degree of concrete,which could provide a reference for the application of piezoelectric ceramics to detect concrete cracking damage.