Design For Hooped Particle Damper And Experimental Research On Its Damping Performance

The cables in large-span cable-stayed bridges vibrate easily due to their light weight, slight stiffness and low damping. The studies on the vibration control of cables have become hot issues in the engineering field at home and abroad. The key to control the cable vibration is to effectively improve the damping of cables.By utilizing the advantages of particle damping in its significant improvement in damping and broad damping bandwidth, this research intends to design a particle damping hoop, which can be used on cables, to improve the structural damping of the cables, so that the cable vibration caused by various factors can be effectively controlled. According to the vibration experiments and numerical analysis based on the discrete element theory for the particle damping hoop, the configuration of damping hoop and the particle damping related parameters, such as particulate material, particle size, the filling ratio and mass ratio etc, will be analyzed to obtain the reasonable configuration form of damping hoop and the reasonable range of particle damping parameters. According to the free vibration experiments for the cable model with damping hoop and numerical analysis for the particle damping model of cable, optimization and adjustment will be made for damping hoop as well as particle damping parameters. Based on the experimental results of cable vibration under wind and rain and parameter vibration, the damping effect of the damping hoop will be summarized and the energy dissipation mechanism of damping hoop revealed. The design ideas and guidelines for the damping hoop will be proposed. The research results will provide new ideas and methods for the vibration control of stay cables.1, Single hooped particle damper vibration experiment, the two different forms of vibration band namely fan column cavity damping ring and cylinder cavity vibration band, compared the experiment fully both vibration reduction performance. Cylindrical cavity single vibration band for the same vibration frequency and the same filled with particles of structure damping value is larger.2, Single hooped particle damper vibration experiment, in the experiment all other conditions being equal, the higher the vibration frequency damping value of the corresponding structure. 3, The fan cavity double hooped particle damper vibration experiment, comparing single damping coupling experiment, fan column cavity ShuangJian hoop under three different frequencies of vibration damping performance than fan column cavity single vibration band.4, The fan cavity double hooped particle damper vibration experiment, in all other conditions being equal in the experiments, the structure of the whole damping value with the increase of vibration frequency increases.5, The fan cavity double hooped particle damper under three different frequency vibration, using the smallest vibration frequency,-100mesh corresponds to the structure of the iron powder damping value is higher than other two kinds of particles, and in the high frequency vibration, the increase of fine particles on the structural damping effect is best.Through this study aimed at hooped particle damper vibration experiment, combined with discrete element simulation software, designed with damping effect of hooped particle damper structure form and the layout on the artifacts.