Research On Mechanism Of Vibration Reduction Of Several Typical Phononic Crystals-Lattice Composites

Phononic crystals-lattice composite is a new type of composite that gets inspiration from lattice theory and the theory of phonon crystal materials. This kind of composite has received attention in the field of anti-vibration and noise reduction materials since it was presented by researchers many years ago.It has the good characteristics of high stiffness, light weight and high strength as lattice materials and the unique effect of phononic crystal in terms of vibration absorption. Because of this fact, phononic crystals-lattice composite can be a better choice in the aerospace field, transportation field and instrument field, etc.Since the studies of phononic crystals-lattice composite were processed respectively, and different methods and parameters were used, such as different micro-structures and the different size parameters of the unit cell, the different parameters of materials, different constants of the experimental process and the different processing of calculation results and so on. This situation is neither conducive to the comparison of different phononic crystals-lattice composites nor favorable to the follow-up researches on these composites. Therefore, the purpose of this paper is to summarize the works our research group has done and investigate the mechanism of the vibration reduction of phononic crystals-lattice composites. In this paper, Harmonic Response Analysis Method is chosen to compare the damping characteristics of different phononic crystals-lattice composites and analyze the influence of different parameters on the phononic crystals-lattice composite damping characteristics. I have studied the vibration transmission characteristics of the simulation models with different unit structure parameters in the software platforms of ANSYS and MATLAB.Some conclusions are drawn through a lot of calculations and comparisons. The main conclusions conclude:models with scale of20X10X10can satisfy the calculation accurate demands of the transmission properties of composite materials, costing less time and space; Different structures with lattice unit cell have different elastic wave band gap characteristics; smaller radius of truss, larger point mass and smaller elastic modulus of the filling materials can improve the vibration absorbing performances of lattice composites.