複数の転動体を補助質量とした動吸振器の開発

抄録

Dynamic vibration absorber (DVAs) are effective passive damping devices that are widely used. The typical structure consists of a mass, a spring and a dashpot that is attached to a structure in order to reduce the dynamic response of the structure. However, the tuning process of them is complex and expensive. Although the DVAs with some rotary elements can overcome the weakness, these investigations have not yet been completed. As large earthquakes often occur recent years, the improvement of the damping method is required. This paper presents the results of experimental and analytical studies of the performance of a dynamic vibration absorber with rotary elements in a horizontally vibrating system. This damper consists of some rotary elements, which rolls on the cylindrical surface of a primary mass. A frictional force is also added to the system to suppress the amplitude of the primary mass. The rotary elements and the cylindrical surface used in this study were SUS304 and PMMA, respectively. It is shown that the frictional force and the particle size influence the damping performance. The validity of this damping is examined by a comparison of the response of the primary mass between the experimental result and analytical result obtained using conventional tuned rotary-mass damper.