Optimal Sensor Placement And Damage Identification Study Of Hydraulic Structure Dynamic Testing

Safety monitoring of hydraulic structures and water damage identification is a contemporary workers in hot research topics. The safety and reliabilityof hydraulic structures, which have an important effect to the social and economic development, are related to social harmony and national stability.Accurately assess the structure of the actual state and the building of effective diagnosis, is the basic premise of structural reliability.Optimization of sensor placement problem is safety of hydraulic structures operating condition monitoring and damage identification of key technologies to solve the first, the limited sensor arranged in the right place, the biggest play the role of the sensor will pick up to improve the accuracy of modal parameters. With the theory of Optimal sensor placement, this paper involves the following major research results.Firstly, study on acceleration sensor placement optimization method.The lack of traditional optimization methods, taking into account the measurement vector orthogonality and modal kinetic energy of the interaction, proposed to improve the MAC guidelines.Based on the guidelines in improving the MAC,put forward improved MAC method ,witha modal matrix QR decomposition results as the initial test point and an integer-coded genetic algorithm to add test points. Finally, using the effective independence method (EI), based on the column pivot QR decomposition of the MACmethod, effective and independent - the driving point residual method and improved MAC method tooptimize the layout of the sensor for apumping stationcolumn. MAC criteria,improved MAC criteria, the optimal anti-noise performance criteria and the number of vibration-based conditionwere used toCompare four methods. Results showed that the improved MAC method than the other three traditional methods has obvious advantages.Secondly, study onstrain sensor layout optimization method. Based on the strain modal assurance criterion, proposed strain modal energy ensure criteria SEMAC. The criterion including a vector orthogonal strain modes and energy demands,solved the contradictions of structural dynamic feature extraction and modal parameter identification. Finally, using the proposed method of QR-GA to optimize the strain sensor layout of the Laxiwa Arch Dam, the results show that the proposed criteria and methods can effectively configure the strain sensor. Finally,damage identification of optimal sensor placement.The finite element model of the guide wallwas established in the paper,and then optimized the layout of its accelerometer .Assumed the guide wall has occurred different degrees of damage in different locations.Export the change in frequency, modeandflexibility.From the three aspects , the acceleration sensor placement optimization method was examined in terms of damage identification.