Research On Optimal Layout Of Health Monitoring Sensors For Hydraulic Arch Gate Structure

As a large engineering structure in water conservancy and hydropower projects,the hydraulic arch gate structure plays a major role in regulating the water storage capacity of reservoirs and maintaining the ecological balance of the system through different opening degrees of the gate.Hydraulic arch gate structure,as a large steel structure in long-term service in engineering practice,is easily affected by dynamic load of water flow and the continuous action of each constraint member,and its structural performance and strength are easily affected.In serious cases,failure occurs and accidents occur.Therefore,it is of great significance to construct hydraulic arch gate structure health monitoring system.Sensors are the foundation of health monitoring system,so they have important theoretical significance and engineering application prospect to study the optimal arrangement method and scheme of sensors.In the article,by means of theoretical analysis,simulation calculation and experimental verification,a hydraulic arch gate is taken as an example to study the theoretical method and scheme design of the optimal arrangement of the acceleration sensor for vibration monitoring of the arch gate,and experimental verification is carried out in combination with the shrinkage model of the reservoir.The main research work includes:(1)Aiming at the problem of sensor layout in the health monitoring of arc gate,the optimal sensor layout method combining effective independent method(EI),ROC criterion,WMAC criterion and polynomial fitting is proposed.The related theories are deduced and analyzed to lay the scientific theoretical foundation of the method,and the related algorithms are also discussed.The application significance of each algorithm in the proposed method is explained.(2)Considering the radial gate actual service condition,divided into two kinds of wet modal and dry modal simulation analysis was carried out on the radial gate,based on the optimal placement of the sensor simulation data and the proposed method,the modal and dry wet modal two cases separately carried on the solution of optimal placement of the sensor design,and analysis of the characteristics of two kinds of design scheme and differences.(3)According to the optimal arrangement of sensors,sensors are installed on the radial gate scale model,and modal test experiments are carried out.The design scheme is verified by experiments from the calculation of natural frequency error between experimental model and simulation model,comparison of vibration modes and evaluation results of modal confidence criterion.Through the analysis of the experimental results of modal test,it is concluded that the sensor optimal arrangement scheme and method studied in this paper is reasonable and feasible,and has good applicability.The results of this paper lay a foundation for intelligent operation and health monitoring of arc gate.