Study On Vibration And Acoustic Insulation Characteristics Of Multiple Honeycomb Sandwich Structure

After its birth,honeycomb sandwich structure has the advantages of high specific strength,high specific stiffness,fatigue resistance,excellent thermal insulation and noise reduction,and its mass is lighter than the homogeneous structure of the same volume.Therefore,it is deeply loved by researchers and technicians in the field of weight-sensitive Aeronautics and astronautics,and invested a lot of energy and resources in research,so that it can be widely used in major related fields.Hexagonal honeycomb is the most common honeycomb sandwich structure,and most of the existing studies are hexagonal honeycomb.At the same time,analyzed the mainstream hexagonal honeycomb,dense round honeycomb,sparse round honeycomb,triangular honeycomb and square honeycomb.Equivalent elastic mechanical parameters,vibration control equation,sound transmission loss and main influencing parameters of honeycomb sandwich panels are analyzed and discussed.Firstly,by using the sandwich theory and the principle of equivalent strain energy,assumed the research model.Then,by using the relevant mechanical knowledge given the simplified equivalent model of honeycomb sandwich structure,deduced and calculated the elastic mechanics parameters of the corresponding equivalent model of various honeycomb sandwich structures one by one.Secondly,based on the relevant equivalent parameters and sandwich panel theory,established the vibration control equation of honeycomb sandwich structure with simply supported boundary conditions on four sides.The first five modes and corresponding frequencies of honeycomb sandwich structure are obtained by using Comsol multiphysical field simulation software,and comparing the numerical analysis results with with the software simulation results.To verified the correctness and reliability of the theoretical model.Finally,by using acoustic wave equation and sound transmission theory,combined with the basic principles of acoustics,the theoretical model of acoustic insulation calculation of honeycomb sandwich structure is established,and verificated the correctness and reliability of the theoretical model by using Comsol multi-physical field simulation software.Then the acoustic insulation performance of honeycomb sandwich panels with dense circular,regular hexagonal,triangular,sparse circular and square honeycomb sandwich structure are compared.It is concluded that the dense circular honeycomb sandwich panel has the best acoustic insulation performance compared with other types of honeycomb core sandwich panels when the structure density of sandwich panels is the same,while the hexagonal honeycomb sandwich structure have the best acoustic insulation performance when the shear stiffness of sandwich panels is constant.The effects of core height,panel thickness and core grid thickness on acoustic insulation performance of honeycomb sandwich panels are discussed in detail.Relevant conclusions are drawn.Whether changing the configuration or size parameters of sandwich layer in honeycomb sandwich panel structure,the essence is to follow the principle that the acoustic insulation characteristic curve is controlled by the quality of structure and stiffness of structure.Studied and analyzed both of two parameters.