基于简谐激励的颗粒阻尼性能试验研究

Particle damping technology is a new vibration passive control approach. It has a lot of advantages, such as flexibility of layout, the distributed damping it provided, the notable effect of vibration absorption, even at a wide frequency bandwidth. Hence, it is widely researched in aeronautics and mechanical engineering, however, is still in the immature period in civil engineering. In this paper, the single degree of freedom (SDOF) steel frame was designed and manufactured, and was taken as a study project. Compared the response of the original structure and the structure attached with particles under harmonic excitation, the influence of the parameters on the effectiveness of the seismic control such as the filled mass of the particle, the size of the particle, the friction coefficient at the bottom of the container, the intensity and the frequency of the excitation have been researched. The results showed that, with the increase of the particle mass, the effectiveness of the seismic control increased at the beginning and then decreased; the smaller particle showed better effect than the bigger one; under harmonic excitation, the friction coefficient had little effect on the performance of particle damping. In this paper, with the increase of the excitation intensity, the performance maintained at a certain level at first and then became worse. When the frequency of the excitation was smaller, the response of the structure with particles was likely to be higher than the structure without particles, on the contrary, when the frequency of the excitation was larger than or equal to the natural frequency of the primary structure, the response of the structure decreased greatly. All of this indicated that particle damping technology had a good effect in reducing the vibration of single-degree freedom structure; it had a wide prospect in civil engineering.