Abstract
Effect of base shape on damping characteristics of rocking of rigid body is presented. We pay attention to the fact that free vibration amplitude of rigid body decrease rapidly without dampers or damping materials. We consider rocking of rigid body is very attractive as a low cost dynamic vibration absorber. At first, damping characteristics of rocking of typical rigid body with flat base shape is discussed theoretically. Next, we propose new type rigid body which base shape is polygon in order to design damping characteristics of rigid body in wide range. Theoretical analysis method for damping characteristics of rigid body is derived. By calculating damping ratio of proposed rigid body using derived equations, it can be seen polygon base shape is very useful to design dynamic characteristics of rigid body.
