Working of Magnetic Dynamic Absorber : Optimal Damping of M.D. with a Viscous Damper

抄録

A dynamic absorber which contains two fixed side magnets, and an absorber magnet (absorber mass) ' is called a magnetic dynamic absorber (M.D.). The absorber magnet is located between the side magnets and floats along the axis between them, each working on each other's magnetic forces. As the vibrating system (principal mass) is attached on a damped magnetic dynamic absorber and subjected to an external periodic force, the amplitude of the principal mass can be decreased. In this paper, the vertical and horizontal vibrations of a periodically forced vibrating system with M.D. are analyzed. Especially the most favorable state in the principal mass which is worked by M.D. is discussed and the values of its amplitude in the most favorable state are solved. Then the absorber factors of M.D. which depend on the condition are obtained and these are compared with the experimental results.