Experimental Study On Vibration Attenuation Characteristics Of The Particle Damper System Of Cantilever Beam

Particle damping technology was developed in 1990's and it is a new-born vibration passive control technology. The principle of this technology is:on the propagation path of the vibration of the system, we process a certain number of cavities on the system structure or put external cavity structures on the system structure, and then fill the cavities with an appropriate amount of metal particles or non-metallic particles. When the system structure is subjected to vibration excitation, particle damping dissipate the vibration energy of the system architecture through continuous movements of collision and friction. It significantly improves the damping characteristics of the system structure, and then achieve the purpose of suppressing the vibration of the system. Particle damping technology has many advantages, such as: simple in the structure, cheap, good in damping capacity, minor changes to the system structure, and applicable to high temperature, corrosion and other harsh environments.In this paper, we explore and study the influencing factors of particle damping by means of experimentation based on the experimental stage of cantilever beam workpiece, The main work includes the following aspects:(1)Elaborate the basic principle of the discrete element method of particle damping and its general procedures and equations. Introduce the contact mechanics model of inter-particle, and then based on this model, we introduce the energy dissipation mechanism of impact and friction of the particle damping technology.(2)Determine the main influencing factors of the characteristics of particle damping; design and processing the laboratory bench; buy the experimental materials, design and processing the cantilever beam and design the size of particle damper; get ready of the necessary equipment and instruments of the laboratory bench; determine the scheme and purpose of the experiment; introduce the principle of the half-power bandwidth method to calculate the damping ratio.(3)According to different influencing factors, we design the relative experimental schemes. After organizing the experimental data, we analyze the potential causes according to the regularity of the data. The experiment is mainly divided into two parts:a large volume damper experiments and plurality of small volume dampers experiments. The purpose of the experiments is clear and orderly.(4)We examine the effects of the particle mass on the characteristics of the particle damping. According to the experimental data points, we obtain fitting curves through Matlab, and also analyze the sources of error. Try to provide a quantitative computing method of the performance of the particle damping, also provide some data basis for the future research.(5)In order to get a comprehensive understanding of the characteristics of the particle damping, this article arranges other experimental programs, including the experiment of same quality of particle but different filling rates, the experiment of the factor of the combination of damper diameter and particle diameter, the comparative experiment between a single large volume of damper and several small volume dampers in the case of the same mass of particles. Meanwhile, we analyze the potential causes of each experiment result.