Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2021
Date : September 13, 2021 - September 17, 2021
Beam like structures, such as columns, pipes, bridges and high-rise buildings, are difficult to reduce vibrating. A commonly approach to control these vibrations is to use a dynamic absorber. Most of the dynamic absorbers have been used to reduce the transverse motion of beam by exerting a shear force on beam (hereafter called shear type dynamic absorber). In a previous paper, the authors researched two types of dynamic absorber: one that exerts a bending moment on the beam (hereafter called a moment type dynamic absorber), and one that exerts both a shear force and a bending moment on the beam (hereafter called a shear and moment type dynamic absorber). When three types of dynamic absorbers were installed on cantilever and simply supported beams, the optimal conditions of the dynamic absorbers were derived. The results showed that the peak values of frequency response focusing on an absolute displacement were reduced in case of the moment type or the shear and moment type dynamic absorbers comparing to the shear type dynamic absorber. In order to investigate the effect of vibration suppression about a deflection of the beam, which is focusing on a relative displacement, an elastic vibration of the beam focusing on the relative displacement were derived, and the frequency responses about the relative displacement of the beam were obtained theoretically. Then numerical calculations were carried out, and the results are compared with those of the previous paper focusing on absolute displacement.
