Inversion Analysis Of Underground Plant Load Based On Vibration Responses

As a current phase of development technology mature, clean, renewable energy, thehydropower achieves the perfect fusion between economic development andenvironmental damage. As a mature and effective form of the construction ofhydropower stations, with the capacity and water pressure of the unit station improved,the unit vibration problems have become increasingly prominent, and attended thephenomenon of vibration of the structure of underground plant. In view of theextreme damage of structural vibration, the plant structural vibration has also becomean important issue in the hydroelectric energy development and construction process.In the field of engineering applications, people are always interested in the scientificresearch and technology advances of the fluid-structure interactions, so the study ofthe structure vibration of underground hydropower plants has its practical applicationsignificance.This paper study an underground hydropower plant structure, establish athree-dimensional FEM in large finite element software ANSYS, take an analysis ofthe dynamic response of the vibration of underground plant structure, use the geneticalgorithm to study the inversion analysis of underground plant structure loads. Maincontents are as follows:(1) First give a summary of the research of underground hydropower plant statusat home and abroad, introduce several commonly used methods of the inversionanalysis, summarized the theory and applied research of the flow-induced vibration,and apply a theoretical foundation for the inverse analysis of the vibration loads.(2) According with the field measured data of the underground hydropower plant,with the establishment of finite element structural model and the inverse analysismethod of hydraulic flow-induced vibration, based on the approved geneticoptimization algorithm, combined with the genetic algorithm results and the forwardanalysis of structural model to get the parameters of the vibration load, contrast withthe measured plant structure vibration responses, confirmed the feasibility of theinversion analysis.(3) Under the vibration responses of the hydroelectric unit and plant structurefrom the prototype engineering test, then analyze the theoretical and measuredvibration source of the hydropower vibration, provide an effective method with agood combination of theory and practice to structural damping and vibration, get theactual vertical vibration relationship between the unit and the plant structure.(4) With the established finite element model, give a feedback analysis of verticaldynamic load applied to the underground plant structure. Analyze the relationship between the vertical dynamic load and axial thrust by using the existing experimentaldata, obtain a fitting multiple relationship between the dynamic load for calculatingvertical displacement and the axial thrust.