Design And Analysis Of New Acoustic Baffle And Study Of Bulging Process

The sound barrier plate is a new type of sound insulation material,compared with the traditional indoor sound insulation material sound barrier plate has the advantages of high specific stiffness,light weight,good sound dissipation performance,low cost health and environmental protection,is an excellent sound insulation material to supplement.However,due to the special characteristics of its material structure,its forming performance during processing is different from that of ordinary panels,so the acoustic performance and forming characteristics of sound barrier panels need to be analyzed and studied.This paper is based on the theory of expansion process,the theory of elastic-plastic mechanics,the theory of resin layer cohesion model and the theory of acoustics,and uses finite element technology as a tool.The forming structure,resin layer mechanical properties,forming process and forming properties of the sound barrier plate are analyzed respectively.The theoretical method and forming guidance are provided for the sound barrier plate expansion process.The specific work accomplished is as follows.Firstly,a comparative analysis of the sound insulation performance of the studied sound barrier plate and the common steel plate was carried out.Because the sound barrier plate needs to be formed into a certain shape in the practical application,an array of crater structure was designed.The designed shapes were analyzed for indoor sound field uniformity,and the better structure was selected for structural sound insulation analysis based on the sound field uniformity results,and the required expansion structure was finally determined.Secondly,a three-point bending simulation test was conducted on the sound barrier plate,and the simulation results were compared with the theoretical analytical solution to provide a theoretical basis for cell selection,cell algorithm selection and interface connection for the finite element analysis of the sound barrier plate.The finite element analysis of the sound barrier plate is based on the hybrid cohesive force model,and the finite element analysis of the T-peel and shear performance experiments of the sound barrier plate are performed to provide the criterion for the selection of the bilinear instantonal model.Implicit versus explicit kinetic analysis of the finite element calculations is investigated to provide further knowledge of both algorithms.Finally,the sound barrier crater structure expansion process is investigated.The design and optimization of the tension bars of the crimped edge are carried out,and a new expansion method is proposed in this paper according to the process problems that arise during the expansion process.Simulation design of the crimp of the tie bar is carried out under the new expansion method,crimping force analysis of the crimp of the tie bar is carried out,and quality evaluation criteria for the tie bar are established.The effect of friction coefficient on forming quality was also studied.The effect of friction coefficient on the forming quality is also studied.Parameter design and optimization of the sound barrier plate array pits are carried out to provide reference and guidance for the forming of the sound barrier plate.