Experimental Study And Numerical Simulation Analysis For The Vibration Attenuation And Energy Dissipation Mechanism Of Particle Damping

Particle vibration damper has been widely caught attention by the engineering and technical personnel and academics with its frequency bandwidth, low-impact, low noise and temperature adaptability, etc. Fine particulate matter systems help to further reveal the mechanical behavior of the energy particle damping mechanism, and one very important aspect is to introduce the of plastic behavior of particulate with the absence of a comprehensive theoretical system to the contact model construction. With the development of the basic theory of granular media and the improvement of the high-performance computing technologies, through studies of different the mechanism of granular media vibrational energy macro-meso-scale, particle damping technology is expected to facilitate the improvement and development.Field tests and numerical simulation are used in this thesis. Firstly, Models are studied under different contact energy particle damping mechanism and damping characteristics. Then, we establish the constitutive relationship in sticky-elastic-plastic of particle. Next, we analyze the different models for granular media exposure energy mechanism and damping characteristics. Lastly, we study the key features of different materials, geometry, and other parameters under external excitation energy vibrating granular media the main features of the mechanism. The main contents are as follows,By using the finite element method and based on ABAQUS system, we study the impact of the elastic static contact model element type, number grid, load size and mode of authentication methods on the simulation results, and establish a model consistent with the Hertz theoretical solution. Based on this model we study the mechanical behavior of granular plastic contacts. Then, based on finite element calculation results, and the numerical fitting between the different size of plastic deformation force and the deformation, ultimately, we get the constitutive relation in contact dimensionless normal plasticity under the specific material (aluminum material in this thesis). In this paper, we also have a preliminary analysis of the dynamic elastic-plastic particles.Using FORTRAN platform, we develop the particle damping DEM numerical analysis system based on stick-elastic-plastic contact model and study the characteristics of plasticity of contact particle damping energy dissipation. The results show that the contact between the particles of the plastic particle damping is the main form of energy, and when the particles occurs the plastic energy, the other forms of energy as a proportion of total energy consumption will be significantly reduced.We design and complete the experiment study on vibration of the external particle dampers to harmonic excitation damping on the charpy. Through the system excitation force and acceleration vibration response spectrum analysis, we observe the phenomenon of particle damping system in the frequency under different harmonic excitation conditions and the frequency multiplication is from the nonlinear vibration of the granular media. Half-power point method used to study parameters such as particle size and particle excitation power vibration damping system damping ratio. The results show that there is an only optimal fill rate in the larger size of the particles damper; when the particle size is smaller, the optimal filling rate distributed in a range; when the particle size is smallest, there will be multiple local optima fill rate. Meanwhile, the larger exciting power is also more conducive to play the damping effect of particulate media.