Analysis Of Coupling Dynamics Characteristics Of Vibration Source And Supporting Structure Based On Substructure Method

Vibration isolation and prediction are hot issues that need to be resolved in actual engineering.In the field of ships,vibration prediction and isolation of power machinery on ships are also concerned by many scholars.With the wide application of various deck structures in the marine field,the establishment and solution of coupling models of power machinery and actual foundations have important practical significance and engineering value.This paper uses the substructure method to establish a vibration source-supporting structure coupling model,and analyzes the dynamic characteristics of the vibration source-supporting structure model.The main research contents and results are summarized as follows:The improved Fourier series method is used to model the stiffened plate structure under any boundary,and the natural frequency and vibration response of the stiffened plate are analyzed and verified by simulation.The specific analysis of the stiffened plate structure under different stiffened beam parameters is carried out,and the influence of the stiffened beam parameters on the inherent characteristics of the stiffened plate is obtained.Based on the sub-structure method,the vibration source-support structure coupling model is decomposed into substructures and the admittance characteristics are analyzed separately.The vibration source and the support structure are coupled to build a complete mathematical model.The simulation verification and comparison of the vibration source-support structure coupling model are carried out to ensure the accuracy of the model,and the vibration source of the vibration source-support structure coupling model is identified,calculated and analyzed.The power flow method is used to analyze the power flow of the model,from the perspective of energy input and energy flow in the foundation,and analyze the changes in power flow by changing its structural parameters.Build an actual experimental bench of the vibration source-support structure,test the vibration response at any point of the support structure,and compare the experimental results to analyze the cause of the error,so as to further prove the accuracy of the model.In this thesis,the dynamic analysis of the vibration source-support structure coupling model is described in detail.The coupling model is established through the sub-structure method,and the dynamics of the coupled system is explored from the aspects of energy transfer,vibration prediction,and force source identification.The characteristics provide a theoretical basis for the subsequent vibration characteristics of actual engineering structures.