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随着工程结构的日益大型化和复杂化,结构损伤检测时需要布置大量的传感器.传统的集中采集和处理的技术将难以胜任海量数据的处理要求.有利于降低成本,密集布置的无线智能传感器就成为大型结构健康监测系统的最佳选择.采用分布式损伤识别方法是密集布排的无线传感测试系统的必然要求.针对拱桥吊杆损伤的问题提出应用于无线传感网络的分布式识别技术.以一混凝土钢管拱桥为实验平台,松动吊杆端部锚具制造不同程度的松弛损伤,对损伤前后拱桥进行振动测试,按照网络拓扑情况,利用功率谱密度曲率差法进行损伤识别分析.结果表明:分布式损伤识别技术能够成功识别拱桥吊杆损伤,并且该方法可以应用到其他密集布排无线传感器的大型复杂结构的健康监测和检测中.
With the increasingly large-scale and complex engineering structure, a large number of sensors need to be arranged in structural damage detection, and the traditional centralized acquisition and processing technology will be difficult to handle the requirements of massive data processing.It is conducive to reducing costs and densely arranged wireless smart sensors It becomes the best choice for large-scale structural health monitoring system.Distributed damage identification method is an inevitable requirement of densely arranged wireless sensor test system.Aiming at the problem of damaging the suspension bridge of the arch bridge, a distributed identification Technology, a concrete-filled steel tube arch bridge was used as the experimental platform, loosening the end of the boom to produce different degrees of relaxation damage, vibration testing of the arch bridge before and after the damage, according to the network topology, the power spectrum density curvature difference method for damage identification analysis. The results show that the distributed damage identification technology can successfully identify the damage of the boom of the arch bridge, and the method can be applied to the health monitoring and detection of large and complex structures of other densely arranged wireless sensors.