鋳鉄粉が封入されたハイグレードオーディオ機器の振動特性に関する基礎的研究

抄録

The particle damper has a simple structure and can be applied in special environments, and its use in various fields such as railway vehicles is considered. The particle damper is a damper that uses the kinetic energy of particles and consumes the energy by collision or friction energy between a vibrating body and particles. Particle dampers are extremely simple and inexpensive, and unlike general viscous damping and active dampers, they have the advantages that they do not age, do not require maintenance, and do not depend on temperature. Currently, it is used in tennis rackets, shockless hammers, main engines of space shuttles, etc., but it is not many cases in industries. There have been many examples of studies on particle dampers, but many studies have focused on vibrations of 100 Hz or less, and many studies have focused on particles with a particle size exceeding 1 mm. The cast iron powder treated in this study has a particle size much smaller than the particle dampers used so far, and it is currently used in high-grade audio racks, and its damping effect is very excellent, but its damping mechanism is unsolved. In this study, we conducted a test on a high grade audio rack and a speaker stand in which cast iron powder was enclosed, and vibration characteristics of cast iron powder are clarified by comparing vibration characteristics with those of steel balls.