Analysis And Application Of Structural Vibration Characteristics Based On Finite Element Power Flow

Mechanical structures have been widely used in aerospace,ships and buildings,it is of great significance to study their internal vibration transmission path and distribution characteristics.In this paper,the transient power flow characteristics of one-dimensional beam structure,two-dimensional plate structure and coupled plate structure are analyzed by theoretical simulation.The finite element model is established by using ABAQUS that is a finite element software.The energy distribution and displacement in the structure are visualized by using the finite element power flow method based on the stress and displacement.The influence of structural parameters on energy path and distribution also is discussed.The natural frequency of power flow of simply supported beam is experimented through the research,which is consistent with the simulation results.Through theoretical and experimental research,some useful conclusions are obtained,which provide important reference value for engineering practice.The main research contents of this paper include:Taking one-dimensional simply supported beam as the research object,the energy density control equation and power flow formula of the beam structure are deduced,and the finite element model of the beam under harmonic concentrated force is established.The energy distribution and transmission characteristics of the structure are analyzed by using the finite element power flow method.Taking the two-dimensional thin plate structure in mechanical system as the research object,the finite element model of thin plate and coupled plate structure is established by using finite element software,and the visualization of vibration energy distribution,transmission and attenuation in the structure is realized through secondary development with ABAQUS.The energy dissipation characteristics of dampers in plate structures are also discussed.Based on the power flow visualization technique of finite element method,the animation of energy transfer in steel plate structure during steel ball impacting on steel plate is presented.At the same time,the impact model of steel plate with or without circular hole is established.With the help of stress wave nephogram,power flow nephogram and power flow vector graph,the influence of the existence with circular hole on the energy distribution,transmission path,attenuation coefficient and the total vibration energy of the structure is discussed.The natural frequencies of the power flow of simply supported beams are experimented,and the equation between the power flow and the vibration energy parameters of the finite element method is established.The power flow response under swept harmonic concentrated force is obtained,and the theoretical simulation results under the same model are verified.