Research On Vibration Energy Distribution Of Complex Structure Laminates

Composite materials are widely used in engineering fields such as marine and aerospace due to their high specific strength and other characteristics.Structural sound intensity visualization technology can intuitively display the transmission path of vibration energy inside elastic structures.Using the structural sound intensity visualization method to study the energy transfer path and distribution law in the complex structure laminate is conducive to further understanding the vibration characteristics of this type of structure,and provides some reference and help for the study of the dynamic characteristics of this type of structure.In this paper,for the vibration of laminates,first-order shear deformation theory is used to establish mathematical models of ordinary laminates,open laminates and special ribbed laminates,and obtain the energy integral equation describing the vibration of the relevant structures.Especially for ribbed laminates,Timoshenko beams are used to model the rib.At the junction of the rib and the plate,the displacement on the rib and the displacement of the plate are mapped one by one to ensure that at the connection between the rib and the plate,the two have the same the same deformation.Not only that,the boundary of the relevant structure is simulated by the spring model,so that the mathematical model of the structure can more accurately describe the special boundary of the laminate.Secondly,the energy integral equation in the mathematical model is solved by the improved Rayleigh-Ritz method,the mass matrix and stiffness matrix of the related structure are deduced,the dynamic problem of the plate-shell structure is transformed into the problem of solving the characteristic matrix,and the detailed discussion is given.The effects of boundary conditions,opening parameters,rib parameters,rib method,and location of openings and ribs on the free vibration characteristics of laminates.Finally,the vibration energy distribution characteristics of the laminated plate with complex structure under forced vibration are studied by using the structural sound intensity visualization technology.According to the structural sound intensity formula in the time domain,the sound intensity formula of the plate-shell structure in the frequency domain is derived.Numerical simulation experiments of energy distribution in complex laminates were carried out using Python software and finite element software,and visualization methods were used to demonstrate.Finally,the effects of boundary conditions,opening parameters,excitation frequency,and additional dampers on the vibration energy flow of complex laminates are discussed.